Journals >Chinese Journal of Quantum Electronics
Contents
2005
Volume: 22 Issue 5
33 Article(s)
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Research Article
Numerical simulation and experiment for the optimization of dual-stage L-band EDFA
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The dual-stage L-band EDFA is optimized. At first, we make a simulation about the effect to the L-band EDFA by change of the proportion of EDF length of each stage by OptiAmplifier4.0 with other factors unchanged. Then we make a further optimization to the pump power of each stage to obtain the intrinsic flat gain specThe dual-stage L-band EDFA is optimized. At first, we make a simulation about the effect to the L-band EDFA by change of the proportion of EDF length of each stage by OptiAmplifier4.0 with other factors unchanged. Then we make a further optimization to the pump power of each stage to obtain the intrinsic flat gain spectrum as wide as possible. Based on that a experiment with a 42 meter long EDF is made, with the outcomings as follows: the ASE spectrum is from 1566.84 nm to 1606.80 nm within 3dB bandwidth,which is about 40nm,Within the L_band spectrum,the small signal gain is about 25dB,Noise figure is about 5dB..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 764 (2005)
Research and development of high brightness GaN-based blue LED and white LED
[in Chinese], [in Chinese], and [in Chinese]
The high-brightness GaN-based blue-light-emitting diodes impacts traditional illumination lamp-sources largely. This paper briefly introduces GaN material, the development on blue LED based on it with the technique enhancement and several approaches to improve the performance of the LED： Applications of LED on illuminaThe high-brightness GaN-based blue-light-emitting diodes impacts traditional illumination lamp-sources largely. This paper briefly introduces GaN material, the development on blue LED based on it with the technique enhancement and several approaches to improve the performance of the LED： Applications of LED on illumination field and its advantages over tile traditional lamp-sources are pointed out： Two ways to fabricate white LED and recent progress in white LED are included： At last important problems that, we must face are put forward.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 673 (2005)
Hyperspectral image compression based on 3D SPIHT coding algorithm
[in Chinese], and [in Chinese]
A 3D SPIHT algorithm is proposed to deal with the compression of hyperspectral images, In order to eliminate the intraband and interband dependencies, 3D discrete wavelet transform is used to decorrelate the hyperspectral images. After transform, Said and Pearlman＇s SPIHT algorithm is used to code the wavelet coefficieA 3D SPIHT algorithm is proposed to deal with the compression of hyperspectral images, In order to eliminate the intraband and interband dependencies, 3D discrete wavelet transform is used to decorrelate the hyperspectral images. After transform, Said and Pearlman＇s SPIHT algorithm is used to code the wavelet coefficients. The spatial orientation trees of the wavelet coefficients are three-dimensional, so a 3D SPIHT algorithm is constructed to suitably compress the hyperspectral images. The test results show that the 3D SPIHT algorithm based on 3D DWT for hyperspectral images compression is very efficient, the algorithm is embedded and has modest complexity.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 680 (2005)
Wavelet spectrum and its application to LFM signal detection
[in Chinese], and [in Chinese]
Gauss linear frequency modulation wavelet is selected as base function to study wavelet spectrum, and its smoothed spectrum in time and frequency domain. LFM signal detection and parameter estimation is deduced. At last, wavelet transform of LFM signal is presented, and LFM signal detection based on wavelet spectrum isGauss linear frequency modulation wavelet is selected as base function to study wavelet spectrum, and its smoothed spectrum in time and frequency domain. LFM signal detection and parameter estimation is deduced. At last, wavelet transform of LFM signal is presented, and LFM signal detection based on wavelet spectrum is studied.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 685 (2005)
Numerical simulation of a chemical oxygen-iodine laser with chemical generation of atomic iodine
[in Chinese], and [in Chinese]
One-dimensional pre-mixed model for a COIL, in which the iodine molecular was substituted by iodine atomic, was established. Atomic iodine is generated via a series of chemical reactions of ClO2. NO and HI. The dependence of the vield of the intermediate atomic chlorine on total pressure was studied, as well as the infOne-dimensional pre-mixed model for a COIL, in which the iodine molecular was substituted by iodine atomic, was established. Atomic iodine is generated via a series of chemical reactions of ClO2. NO and HI. The dependence of the vield of the intermediate atomic chlorine on total pressure was studied, as well as the influence of HI injection position on the yield of atomic iodine. The small signal gains both of the COIL with molecular and atomic iodine injection were compared. The system of atomic iodine injection is promising to increase the output power of COIL..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 690 (2005)
Stimulation of the A-O cavity-dumping lasers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new theoretical model of acoustoopical cavity-dumping laser is established by analysing the function of the cavity-dumping efficiency on time. And the numeric stimulation is made by the use of the model.A new theoretical model of acoustoopical cavity-dumping laser is established by analysing the function of the cavity-dumping efficiency on time. And the numeric stimulation is made by the use of the model..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 695 (2005)
Scheme design and improvement of quantum key distribution network
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
For the practical and commercial use of quantum cryptography, we need to distribute keys among many users. We introduce E91 quantum key distribution scheme, which is based on EPR pair. Then. based on tile E91 scheme, we propose a quantum key distribution scheme on quantum cryptography network with many users where commFor the practical and commercial use of quantum cryptography, we need to distribute keys among many users. We introduce E91 quantum key distribution scheme, which is based on EPR pair. Then. based on tile E91 scheme, we propose a quantum key distribution scheme on quantum cryptography network with many users where communications among any users can occur： also. combining with WDM technology, we made an improvement on the cascaded loop quantum key distribution network scheme.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 699 (2005)
Analysis of basis direction deviation in quantum communication
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Studies have been made on quantum communications using single particle as the information carrier and the expression of the quantum bit error rate （QBER） of the sifted key established between Alice and Bob has been deduced when there exists an angle deference between the directions of Alice＇s basis and Bob＇s basis. To Studies have been made on quantum communications using single particle as the information carrier and the expression of the quantum bit error rate （QBER） of the sifted key established between Alice and Bob has been deduced when there exists an angle deference between the directions of Alice＇s basis and Bob＇s basis. To tackle the stringent requirements on the angle difference, we propose to construct a universal direction to guide the bases of the sender and the receiver.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 704 (2005)
On the nonidentical atoms entanglement via a vacuum optical cavity induction
[in Chinese]
We use a second order perturbation expansion of the evolution operator T to deduce the efficiency Hamiltonian form of two nonidentical atoms in a highly-detuned optics cavity with single mode;the two nonidentical atoms state vector with time evolution is studied under the initial state in a two-atom direct product in aWe use a second order perturbation expansion of the evolution operator T to deduce the efficiency Hamiltonian form of two nonidentical atoms in a highly-detuned optics cavity with single mode;the two nonidentical atoms state vector with time evolution is studied under the initial state in a two-atom direct product in a vacuum optical cavity. The result shows as follow： （1） the two-atom state vector keep a direct state form and do not produce any entangled state under the condition ｜△1-△2｜ 〉〉 max（g1,g2） or △1＋△2=0,（2） the two-atom state vectors evolve into the entangled state from the initial state in a direct state, and realize a maximal entangled state at a given time under the condition ｜△1-△2｜〈〈max（g1,g2）..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 709 (2005)
Effects of periodic or aperiodic trap on characteristics of three Bose-Einstein solitons
[in Chinese], [in Chinese], and [in Chinese]
The characteristics of the switching and the self-trap of bright solitons in a BoseEinstein condensates （BEC） system of periodic or aperiodic traps are investigated and the evolution of the BEC solitons as time changes is discussed. The atom population transferring ratios among the three BECs as time changes are analyzThe characteristics of the switching and the self-trap of bright solitons in a BoseEinstein condensates （BEC） system of periodic or aperiodic traps are investigated and the evolution of the BEC solitons as time changes is discussed. The atom population transferring ratios among the three BECs as time changes are analyzed, and it is found that population transfer among the three BECs depends on sort of traps, and changes in a periodic or aperiodic manner as the time changes..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 713 (2005)
Effects of the laser field's noise on squeezing in resonance fluorescence
[in Chinese], and [in Chinese]
The quadrature squeezing spectra produced in the resonance fluorescence of a two-level atom driven by a strong coherent field and a weak amplitude-fluctuating field are investigated. For far-off-resonance and strong excitation, the resonance fluorescence exhibits two-mode squeezing around the Rabi sideband frequencies.The quadrature squeezing spectra produced in the resonance fluorescence of a two-level atom driven by a strong coherent field and a weak amplitude-fluctuating field are investigated. For far-off-resonance and strong excitation, the resonance fluorescence exhibits two-mode squeezing around the Rabi sideband frequencies. Thus we have a source of two- mode squeezing that is verv easily frequency tuned simply by adjusting the generalized Rabi frequency. The presence of the strength of the stochastic process reduces the degree of squeezing obtainable. The quadrature squeezing spectra are also effected by the relative phase of the two fields..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 717 (2005)
Effect to three-body entanglement caused by Stark shifts in Tavis-Cummings model
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The Stark shifts caused by the atomic collision in Tavis-Cummings model to study the variation of the entanglement measure of the system are considered. The result shows that the entanglement measures can be strongly affected by Stark shiftsThe Stark shifts caused by the atomic collision in Tavis-Cummings model to study the variation of the entanglement measure of the system are considered. The result shows that the entanglement measures can be strongly affected by Stark shifts.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 722 (2005)
Two two-level coupling-atoms interacting with binomial photon field
[in Chinese], [in Chinese], and [in Chinese]
The atomic population time-evolution of a system consisting of two two-level couplingatoms interacting with binomial photon field and the influences of field parameters on atomic population with the binomial photon field being in different states are investigated. The result shows that the influences of the atomfield cThe atomic population time-evolution of a system consisting of two two-level couplingatoms interacting with binomial photon field and the influences of field parameters on atomic population with the binomial photon field being in different states are investigated. The result shows that the influences of the atomfield coupling strength and the atom-atom dipole coupling strength on the evolution properties of atomic population are different when the binomial photon field is in diRerent states.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 726 (2005)
Quantum effects in a mesoscopic nonlinear electronic circuit
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Considering the bidirection diode in a mesoscopic circuit, we studied the quantum effect of the nonlinear circuit. The results indicate that the quantum Kerr state will been prepared in the nonlinear electronic circuit and the time evolution of the quantum squeezing effects appear periodically in the circuit according Considering the bidirection diode in a mesoscopic circuit, we studied the quantum effect of the nonlinear circuit. The results indicate that the quantum Kerr state will been prepared in the nonlinear electronic circuit and the time evolution of the quantum squeezing effects appear periodically in the circuit according to the nonlinear device.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 732 (2005)
Optimal control of quantum system under bilinear systems
[in Chinese], and [in Chinese]
By means of the achievement of bilinear systems theory research in the macroscopic fields, associated with the characteristic that the mathematical model of quantum mechanical system is bilinear, an iterative optimal controller for a quantum mechanical system is designed through the derivation of the optimal controllerBy means of the achievement of bilinear systems theory research in the macroscopic fields, associated with the characteristic that the mathematical model of quantum mechanical system is bilinear, an iterative optimal controller for a quantum mechanical system is designed through the derivation of the optimal controller with two points boundary values problem. Also by the simulation experiment of states transfer control of the designed quantum system, the effects to control results with different control parameters are detailly analyzed.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 736 (2005)
Chaotic synchronization of intensities and phases in two multi-mode laser fields
[in Chinese], and [in Chinese]
The dynamical properties of two spatially coupled multi-mode lasers are investigated theoretically. When the loss of the system is modulated, the total intensities of the two lasers show perfect chaotic synchronization within certain parameter range. The intensities of the corresponding modes also show chaotic synchronThe dynamical properties of two spatially coupled multi-mode lasers are investigated theoretically. When the loss of the system is modulated, the total intensities of the two lasers show perfect chaotic synchronization within certain parameter range. The intensities of the corresponding modes also show chaotic synchronization. While for different modes, the intensities are totally chaotic. The intensities of the modes in the lasers show mode competition. The phase and phase difference in each mode show very interesting relations. There is some link between the chaotic synchronization of intensities and phases..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 743 (2005)
Simulation of the photon density wave diffusion theory at human being's tissue
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The analysis resolution of the diffusion equation under the condition, which is infinite cube, was predigested by using matrix transform method. And the simulation velocity was improved much. Using the presented typical optical parameter of human being＇s forearm tissue, the simulation result of the analysis resolution The analysis resolution of the diffusion equation under the condition, which is infinite cube, was predigested by using matrix transform method. And the simulation velocity was improved much. Using the presented typical optical parameter of human being＇s forearm tissue, the simulation result of the analysis resolution of the diffusion equation was shown. The influences of the medium＇s basic optical parameter on the photon density wave were analyzed. These results validate the theory that have been provided, and if was found that the analysis resolution is not applicable for the conditions that diffusion coefficient is large..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 749 (2005)
On-line characterization of individual particles from automobile emission by ATOFMS
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Particles sampled directly from the exhaust pipes of a number of vehicles were analyzed using aerosol time-of-flight mass spectrometry （ATOFMS） in real time. Both organic and inorganic chemical species including sodium, calcium, CnHm were observed in individual exhaust particles. Preliminary results suggest that it migParticles sampled directly from the exhaust pipes of a number of vehicles were analyzed using aerosol time-of-flight mass spectrometry （ATOFMS） in real time. Both organic and inorganic chemical species including sodium, calcium, CnHm were observed in individual exhaust particles. Preliminary results suggest that it might be possible to use calcium in combination with more specific organic peaks as a marker for automobile exhaust particles. ATOFMS can also be used as a real-time monitor, characterizing particles produced from vehicles. Furthermore, determination of chemical tracers in individual exhaust particles allows for more accurate source allocation of atmospheric particles..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 754 (2005)
Study on data communication technique of the laser range-finder
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The operation principle of the laser range-finder was introduced. The data communication between the hand-held laser meters and the computer was detailed. Visual Basic was used for programming to control hand-held laser range-finder for data transmission, data collection and data transaction.The operation principle of the laser range-finder was introduced. The data communication between the hand-held laser meters and the computer was detailed. Visual Basic was used for programming to control hand-held laser range-finder for data transmission, data collection and data transaction..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 758 (2005)
Gain and noise figure improvement of the reflection L-band erbium-doped fiber amplifier
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel method for the gain and noise figure improvement of the reflection L- band erbium-doped amplifier via inserting a 980 nm pump laser diode in the input part was constructed. By selecting appropriate power ratio of the 980 and 1480 nm LD, compared to the configuration pumped with only 1480 nm LD, in the wavelengtA novel method for the gain and noise figure improvement of the reflection L- band erbium-doped amplifier via inserting a 980 nm pump laser diode in the input part was constructed. By selecting appropriate power ratio of the 980 and 1480 nm LD, compared to the configuration pumped with only 1480 nm LD, in the wavelength region from 1565 to 1615 nm. the gain enhances 1.5～9.9 dB and the noise figure decreases 1.3～9.4 dB for the small signal.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 768 (2005)
Calculation and design of photonic crystal fibers with flattened dispersion at 800 nm
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A vectorial effective index method is used to design photonic crystal fibers with flattened dispersion around 800 nm. The dispersion of photonic crystal fibers is obtained by the sum of material dispersion and waveguide dispersion, and the latter can be varied by the scaling property. The flattened dispersion is designA vectorial effective index method is used to design photonic crystal fibers with flattened dispersion around 800 nm. The dispersion of photonic crystal fibers is obtained by the sum of material dispersion and waveguide dispersion, and the latter can be varied by the scaling property. The flattened dispersion is designed to be around the operating wavelength of the widely used Ti： sapphire femtosecond lasers, holding much promise for the study of propagation of ultrashort laser pulses in such fibers..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 771 (2005)
Influence of the change of refractive index in the cladding of photonic crystal fiber on photonic bandgap
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The influence of the change of refractive index in the cladding of photonic crystal fibe on photonic bandgap was investigated. Using the plane wave method the property of center-dfect light guidring was simulated.The influence of the change of refractive index in the cladding of photonic crystal fibe on photonic bandgap was investigated. Using the plane wave method the property of center-dfect light guidring was simulated..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 777 (2005)
Feasibility about dealing data of the optical fiber soliton by Kalman filter
[in Chinese], and [in Chinese]
The simple model about the measure of the fiber strain with optical soliton is analvsed and how to deal with the data measured by Kalman filter is investigated. The result shows that the Kahnan filtering is time-independent. Though the optical soliton time jitter is in direct proportion to the running time. but throughThe simple model about the measure of the fiber strain with optical soliton is analvsed and how to deal with the data measured by Kalman filter is investigated. The result shows that the Kahnan filtering is time-independent. Though the optical soliton time jitter is in direct proportion to the running time. but through the long time sampling, the variance of the measure result is a constant, which shows the project is feasible.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 781 (2005)
Second order soliton interaction under the influence of intrapulse Raman scattering and its suppression
[in Chinese], [in Chinese], and [in Chinese]
Under the influence of intrapulse Raman scattering, the interactions between in-phase and out-phase high-order solitons are investigated numerically, and the impacts of soliton interactions to timing jitter and the impacts of Raman effects to soliton frequency shift are analyzed, respectively. It is found that under thUnder the influence of intrapulse Raman scattering, the interactions between in-phase and out-phase high-order solitons are investigated numerically, and the impacts of soliton interactions to timing jitter and the impacts of Raman effects to soliton frequency shift are analyzed, respectively. It is found that under the influence of intrapulse Raman scattering, in-phase and out-phase soliton pairs are both split. Two split solitons will collide with each other during the propagation and they will be apart from each other after the collision. The difference between in-phase and out-phase soliton pair exists that the interactions of out-phase is weaker than that of in-phase soliton pair and the collision distance of out-phase is much longer than that of in-phase soliton pair. A nonlinear gain can be used to effectively suppress soliton interactions and the effects of intrapulse Raman scattering, and stabilize the soliton propagation.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 784 (2005)
The novel signature code designing and analysis for asynchronous OCDMA system
[in Chinese], [in Chinese], and [in Chinese]
Based on Galois theory of definite field, using the square prime sequence, the code function of basic prime code is modified and extended. The auto-correlation and crosscorelation of MSPC, which based on square prime sequence, are analyzed in detail. The maximum auto and cross correlation are 2 and 1 respectively. And Based on Galois theory of definite field, using the square prime sequence, the code function of basic prime code is modified and extended. The auto-correlation and crosscorelation of MSPC, which based on square prime sequence, are analyzed in detail. The maximum auto and cross correlation are 2 and 1 respectively. And then, going through reconstructing the prime sequence and code function, a novel signature code, ESPC has been acquired. Compared to basic OPCs derived from linear prime sequence, the maximum value of auto-correlation of ESPC is reduced from p - 1 to 1 and cross-correlation is reduced from 2 to 1. the ratio of auto-correlation peak to sideband has largely enhanced, which ensures a better system performance and is more advantageous in signal detection.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 789 (2005)
Study on the survivability of GMPLS-based ASON
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Automatically switched optical network （ASON） has a key characteristic which is the rapid and efficient survivability stratogy. We describe how ASON can provide efficient survivability mechanisms, and present a scheme of GMPLS-based end to end LSP mechanisms.We also analyze the recovery time of different survivability Automatically switched optical network （ASON） has a key characteristic which is the rapid and efficient survivability stratogy. We describe how ASON can provide efficient survivability mechanisms, and present a scheme of GMPLS-based end to end LSP mechanisms.We also analyze the recovery time of different survivability strategy.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 794 (2005)
Design of optical lattice FIR interleaver
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Cascaded coupler interleaver using optical lattice FIR filter model in z-transform is theoretically analyzed. Programming based on the algorithm to resolve optical lattice array concrete parameter （unit time delay △T and coupler angle θk） for objective function, corresponding relationship between z domain low-pass filtCascaded coupler interleaver using optical lattice FIR filter model in z-transform is theoretically analyzed. Programming based on the algorithm to resolve optical lattice array concrete parameter （unit time delay △T and coupler angle θk） for objective function, corresponding relationship between z domain low-pass filter with about 0.5 boundary normalized frequency for pass band and optical domain interleaver are discussed. Five kinds of filters （from a to e） are designed, with rectangle-like amplitude frequency response characteristic curve, fiat top pass band, nearly 0 dB ripples, and isolation up to 50 dB..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 799 (2005)
Application of a new digital thermometer in the field of precision temperature controller for spectral radiance standard detector
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The high accuracy radiometric calibration method and technology is one of the primary technologies of modern remote sensing. Spectral radiance standard detector is a key unit of the new high-accuracy radiometric caliSration technology, and has potential applications in radiometric calibration of field, air-borne and spThe high accuracy radiometric calibration method and technology is one of the primary technologies of modern remote sensing. Spectral radiance standard detector is a key unit of the new high-accuracy radiometric caliSration technology, and has potential applications in radiometric calibration of field, air-borne and space-borne sensors. The temperature change of spectral radiance standard det.ector is a primary factor of affecting its precision and stability. In order to keep the high accuracy of standard detector, a high-accuracy temperature-controlling device is needed to develop. We introduced a new digital thermometer DS18B20 in detail and designed a high-accuracy temperature controlling devices based on DS18B20. The experiment results prove that the temperature-controlling devices we designed can effectively decrease the temperature coefficient of spectral radiance standard detector and is reliable..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 806 (2005)
Optical analysis of space two-axus scanning mirror
[in Chinese], [in Chinese], and [in Chinese]
In order to reduce the scan mirror＇s size of an aerocamera, we can incline the 45° mirror to 60° mirror. Based on the vector theory of optical reflection, the imaging characteristics, scan traces and image rotating between 45° and 60° scan mirror was compared. As viewed from the scan character the fIn order to reduce the scan mirror＇s size of an aerocamera, we can incline the 45° mirror to 60° mirror. Based on the vector theory of optical reflection, the imaging characteristics, scan traces and image rotating between 45° and 60° scan mirror was compared. As viewed from the scan character the feasibility of this method was proved..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 810 (2005)
Measurement of fluctuation of atmosphere refractivity using the near-field optical method
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Exactlv measurement of the fluctuation of the atmosphere refractivity is important for the research on the optical property of atmosphere an and it＇s application on the environmental detection. A theoretical model of measuring the fluctuation of the atmosphere refractivity using the near-field optical method is proposeExactlv measurement of the fluctuation of the atmosphere refractivity is important for the research on the optical property of atmosphere an and it＇s application on the environmental detection. A theoretical model of measuring the fluctuation of the atmosphere refractivity using the near-field optical method is proposed： The surface plasmon resonance effect of the metal is stimulated by the internal total reflection. As a result the propagation mode will be induced in the planar waveguide. The point of the maximum slope in the curve of attenuated internal total reflection is selected as the angular of the incident beam. The variation of the intensity of the reflection beam demonstrates the variation of the refractivity of the atmosphere. The precision achieved using the numerical simulation is 0.000005..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 814 (2005)
Study on uniformity measurements of space integrating sphere
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
It is a difficult probleIn to measure the uniformity of satellite integrating sphere. How to Ineasure its uniforinitv exactly and without interference with the integrating sphere is the subject which has been being studied bv scientists. In order to exactly Ineasure the uniformity of HJY20-1-A super-spectrum imaging inIt is a difficult probleIn to measure the uniformity of satellite integrating sphere. How to Ineasure its uniforinitv exactly and without interference with the integrating sphere is the subject which has been being studied bv scientists. In order to exactly Ineasure the uniformity of HJY20-1-A super-spectrum imaging instruInent in satellite of Chinese Decreasing Disaster Satellite, Anhui Institute Optics and Fine Mechanics of Chinese Academy of Sciences sets a systeln to ineasure a small integrating sphere＇s uniforinity. The system uses a Inethod of indirectly Ineasuring optic signal with a lens. in which scanning is controlled by coInputer. The coInputer is also used to process the data colleced by a high accurate detector. The uniformity of the satellite integrating sphere has becn Ineasured. which shows the uneven of the sphere is less than 0.5%. The system＇s difference of measuring is less than 0.04%..
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 817 (2005)
Micro-facet method for calculating T-matrix of light scattering by particles
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Light scattering by particles is an important part of optical test. The T-matrix method is widely used for the computations of light scattering by particles. The most prevalent way to calculating T-matrix is the extended boundarv condition method （EBCM）, which, however, is largely limited to axisymmetric and near-spherLight scattering by particles is an important part of optical test. The T-matrix method is widely used for the computations of light scattering by particles. The most prevalent way to calculating T-matrix is the extended boundarv condition method （EBCM）, which, however, is largely limited to axisymmetric and near-spherical particles. A new method for calculating the T-matrix is presented. It integrates directly on the particle surface and converts the integral to the summation by meshing the surface with a series of triangles. This method enables us to calculate light scattering by non-axisymmetric and even more realistically shaped particles.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 821 (2005)
Influence of target on the target-background contrast
[in Chinese], [in Chinese], and [in Chinese]
The problem about target discretion is very important in many space applications. It was obtained that the relation between the natural radiance of targets and the targetbackground contrast at 0.4～14 μm. And detailed research about the effects of the radiance and the reflection of the target was also carried out. As thThe problem about target discretion is very important in many space applications. It was obtained that the relation between the natural radiance of targets and the targetbackground contrast at 0.4～14 μm. And detailed research about the effects of the radiance and the reflection of the target was also carried out. As the result, the contrast is increasing with the radiance and the reflection increase. And the spectral radiance and the spectral reflectivity affect, the spectral distribution of the contrast.
Chinese Journal of Quantum Electronics
- Publication Date: Oct. 31, 2005
- Vol. 22, Issue 5, 827 (2005)
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