Journals >Journal of Infrared and Millimeter Waves
Contents
2002
Volume: 21 Issue 6
17 Article(s)
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Research Article
Quantum mechancical model and simulation of GaAs/AlGaAs quantum well infrared photodetector-II electrical aspects
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A complete quantum mechanical model for GaAs/AlGaAs quantum well infrared photodetectors(QWIPs) was presented. The photocurrent was investigated by the optical transition(absorption coefficient)between the ground state and the excited states due to the nonzero component of the radiation field along the sample growth diA complete quantum mechanical model for GaAs/AlGaAs quantum well infrared photodetectors(QWIPs) was presented. The photocurrent was investigated by the optical transition(absorption coefficient)between the ground state and the excited states due to the nonzero component of the radiation field along the sample growth direction. By studying the inter diffusion of the Al atoms across the GaAs/AlGaAs heterointer faces, the mobility of the drift diffusion carriers in the excited states was calculated. As a result, the measurement results of the dark current and the photocurrent spectra are explained theoretically..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 401 (2002)
COMPARISON OF PRE-LAUNCH CALIBRATION IN LAB WITH THE RADIOMETRIC CALIBRATION IN ORBIT FOR FY-2B METEOROLOGICAL SATELLITES IR CHANNEL
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The FY 2B is a satellite with the spin stabilized attitude, it is had to make the absolute calibration for its IR channel while the satellite is in orbit. As the satellite's pre launch Lab calibration had a reference on the in orbit environment temperature changes of FY 2A, its calibration is ideal. With the correcThe FY 2B is a satellite with the spin stabilized attitude, it is had to make the absolute calibration for its IR channel while the satellite is in orbit. As the satellite's pre launch Lab calibration had a reference on the in orbit environment temperature changes of FY 2A, its calibration is ideal. With the correction on quantitatively relationship of the IR channel by the in orbit electronic calibration, the obtained results are very close to the ones from the simultaneous site radiometric calibration over the Qinghai lake..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 408 (2002)
INFRARED RADIATION ABSORPTION CT DIAGNOSIS FOR TEMPERATURE DISTRIBUTION OF PREMIXED PLANE FLAME
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on absorption phenomena of infrared radiation in medium and CT technology, a two dimensional flame temperature distribution diagnosis method was proposed, which was named as infrared radiation absorption CT technology. The principle and measurement process were introduced in detail. Finally, temperature distributBased on absorption phenomena of infrared radiation in medium and CT technology, a two dimensional flame temperature distribution diagnosis method was proposed, which was named as infrared radiation absorption CT technology. The principle and measurement process were introduced in detail. Finally, temperature distribution of a pre mixed plane flame was measured by using the principle..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 413 (2002)
FAST TARGET DETECTION TECHNOLOGY OF EQUALIZING RESOLUTION IMAGE SPACE
[in Chinese], and [in Chinese]
Through the analysis of the distribution function of the rosette scan infrared subpixel seeker, a fast target detection technology of equalization of resolution of image space was proposed.In consideration of the nonlinear characteristics of the image space,by making full use of the information of each pixel, this techThrough the analysis of the distribution function of the rosette scan infrared subpixel seeker, a fast target detection technology of equalization of resolution of image space was proposed.In consideration of the nonlinear characteristics of the image space,by making full use of the information of each pixel, this technology realizes the subpixel target recognition, and improves the target detection probability. The experimental results show that this method is feasible and can be realized in real time in DSP system..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 418 (2002)
INFRARED FREQUENCY CHARACTERISTIC OF ANTIFERROMAGNETIC CRYSTAL
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Frequency properties of infrared nonlinear s polarized surface waves, which transmit through the interface between a dielectric and a nonlinear antiferromagnet were studied. The nonlinear dispersion equation was derived. It is found that there is a critical frequency in the nonlinear s polarized surface waves. Below thFrequency properties of infrared nonlinear s polarized surface waves, which transmit through the interface between a dielectric and a nonlinear antiferromagnet were studied. The nonlinear dispersion equation was derived. It is found that there is a critical frequency in the nonlinear s polarized surface waves. Below this frequency, the nonlinear s polarized waves on the interface are backward surface waves. Using the dispersion equation and boundary conditions, the frequency region of nonlinear s polarized waves was discussed in detail. The results show that not only the power but also the ratio of dielectric constants of two materials can influence the frequency region significantly..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 423 (2002)
PUSHBROOM HYPERSPECTRAL IMAGER AND ITS POTENTIAL APPLICATION TO OCEANOGRAPHIC REMOTE SENSING
[in Chinese], [in Chinese], and [in Chinese]
Pushbroom Hyperspectral Imager(PHI) is a new and special topic of spectral imaging technigue field. It uses high resolution CCD FPA to get hundreds of image data of spectral bands, while keeping a high spatial resolution and high SNR. The PHI, its oceanic remote sensing applications and its perpects are analysed.Pushbroom Hyperspectral Imager(PHI) is a new and special topic of spectral imaging technigue field. It uses high resolution CCD FPA to get hundreds of image data of spectral bands, while keeping a high spatial resolution and high SNR. The PHI, its oceanic remote sensing applications and its perpects are analysed..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 429 (2002)
ANALYSIS FOR TRANSMISSION CHARACTERISTICS OF NON-UNIFORM DIELECTRIC WAVEGUIDES WITH ARBITRARILY TRANSVERSE CROSS-SECTIONS
[in Chinese], and [in Chinese]
A class of non uniform dielectric waveguides with arbitrarily transverse cross sections was analyzed by a method, which combines the staircase approximation with the edge element and mode matching procedure.Non uniform constituent regions were approximated by cascaded step discontimuities. Multi mode microwave networksA class of non uniform dielectric waveguides with arbitrarily transverse cross sections was analyzed by a method, which combines the staircase approximation with the edge element and mode matching procedure.Non uniform constituent regions were approximated by cascaded step discontimuities. Multi mode microwave networks was introduced to represent the step discontinuities. After the eigenvalue problem of the local waveguide was solved by the edge element method, the scattering parameters of these microwave networks were calculated with mode matching method. The transmission property of the whole non uniform structure then was obtained by the treatment of the cascaded microwave network. Because of the versatility of edge element method, the present approach can be used to analyze non uniform dielectric waveguides with different transverse cross sections..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 434 (2002)
STUDY ON GRAND-BASED MILLIMETER WAVE RADIOMETRIC IMAGE SIMULATION
[in Chinese], [in Chinese], and [in Chinese]
Imaging principles of a camera and a grand based millimeter wave radiometer were analyzed. Segmentation and recognition methods of optical images were discussed. The temperature and brightness relations between the terrain surface and sky were discussed .The method of computing the antenna temperature of the terrain waImaging principles of a camera and a grand based millimeter wave radiometer were analyzed. Segmentation and recognition methods of optical images were discussed. The temperature and brightness relations between the terrain surface and sky were discussed .The method of computing the antenna temperature of the terrain was given. Therefore a new technique to generate the grand based millmeter wave radiometric images from visual optic images was presented. The technique was expected to be a useful tool to generate reference images of the matching navigation. Experimental results show that the technique is completely practicable..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 439 (2002)
COLOR CORRECTION FOR REMOTE SENSING IMAGES BASED ON REMOTE SENSING CAMERA MODEL
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The impact of daylight, aerosphere and remote sensing camera sensitivity on the color of remote sensing image was analyzed. Color correction based on remote sensing camera model was presented. Which compensates the erros introduced by daylight, aerosphere and remote sensing camera sensitivity. It can convert color imagThe impact of daylight, aerosphere and remote sensing camera sensitivity on the color of remote sensing image was analyzed. Color correction based on remote sensing camera model was presented. Which compensates the erros introduced by daylight, aerosphere and remote sensing camera sensitivity. It can convert color image under different conditions into image under standard lighting, and it is of interest to remote image analysis. Simulated experiment show that this color correction method basically satisfid.
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 443 (2002)
ADAPTIVE LIFTING WAVELET TRANSFORM AND IMAGE DENOISE
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Adaptive discrete wavelet transform based on the lifting scheme was introduced.The weighed coefficient of Bernstein filter predictor was determined to match adaptively with a desired signal by LMS criteria. The algorithm can be applied to signal denoise by the soft threshold of wavelet. Finally this method was extendedAdaptive discrete wavelet transform based on the lifting scheme was introduced.The weighed coefficient of Bernstein filter predictor was determined to match adaptively with a desired signal by LMS criteria. The algorithm can be applied to signal denoise by the soft threshold of wavelet. Finally this method was extended to denosing of two dimension images. The numerical experiment shows that the method is a powerful method for denoising image. It can keep the character of edge and texture of the image. The advantages of lifting scheme Lie in its flexible design and simple comput ..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 447 (2002)
STUDIES ON CALIBRATION OF EDGE RADIATION FOR IMAGES OF AIRBORNE HYPERSPECTRAL IMAGING SPECTROMETER
[in Chinese]
By analyzing the data of state produced hyperspectral resolution imagining spectrometer OMIS I system, it was found that the same field spectral curves of the edge and center parts of the images were changed showed because of the effects of bi directional reflectance distribution and the bigger scanners (Field of ViewBy analyzing the data of state produced hyperspectral resolution imagining spectrometer OMIS I system, it was found that the same field spectral curves of the edge and center parts of the images were changed showed because of the effects of bi directional reflectance distribution and the bigger scanners (Field of View FOV). The same field features showed different color on color synthesis images. By analyzing a lot of data, a histogram match method was developed for fitting spatial parameter. All of the procedures were carried out in the VC++program. The research result shows that the brightness of the images calibrated by this method have been enhanced greatly..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 451 (2002)
RESEARCH OF BINARI ZATION METHODS USED FOR OPTICAL CORRELATION PATTERN RECOGNITION
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Three new binarization algorithms used for correlation pattern recognition were described, due to the difficulty of realizing correlation pattern recognition by the traditional binarization method. Then were carried out computer simulation and experiment of these algorithms. Experiment results show that these binarizatThree new binarization algorithms used for correlation pattern recognition were described, due to the difficulty of realizing correlation pattern recognition by the traditional binarization method. Then were carried out computer simulation and experiment of these algorithms. Experiment results show that these binarization algorithms has respectively better effects for the pattern recognition of different scenes..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 455 (2002)
TARGET TRACKING FOR IR/MMW COMBINED SEEKER BASED ON DATA FUSION
[in Chinese], [in Chinese], and [in Chinese]
Based on IR/MMW dual-mode, information fusion technology, was provided to improve estimated tracking precision, finally reduce guidance error and enhance performance of weapons. Simulation results show that the technology is effective.Based on IR/MMW dual-mode, information fusion technology, was provided to improve estimated tracking precision, finally reduce guidance error and enhance performance of weapons. Simulation results show that the technology is effective..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 460 (2002)
Investigation of embedding impedance characteristic for a 660-GHz waveguide sis mixer
[in Chinese], [in Chinese], and [in Chinese]
With the help of an electromagnetic field simulator(i.e., HFSS) and a lumped gap source method similar to the quasi optical antennas, the embedding impedance of a 660 GHz waveguide SIS (Superconductor Insulator Superconductor) mixer was thoroughly investigated from 600 to 720GHz.The effects of the junction's feed pWith the help of an electromagnetic field simulator(i.e., HFSS) and a lumped gap source method similar to the quasi optical antennas, the embedding impedance of a 660 GHz waveguide SIS (Superconductor Insulator Superconductor) mixer was thoroughly investigated from 600 to 720GHz.The effects of the junction's feed point displacement(including horizontal and vertical offsets), chip thickness and backshort length were analyzed and calculated.The results indicate that the simulated embedding impedance of the mixer is around 35Ω over the working frequency range, which can match the SIS junction in a large bandwidth. The feed point location of the SIS chip has little effect on the embedding impedance, while the chip thickness obviously does. These results will benefit the development of waveguide SIS mixers..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 6, 465 (2002)
FAST COMPUTATION OF WIDE-BAND RADAR CROSS SECTION USING ASYMPTOTIC WAVEFORM EVALUATION TECHNIQUE
[in Chinese], and [in Chinese]
The asymptotic waveform evaluation (AWE) technique was applied to the method of moments to calculate the radar cross section (RCS) of an arbitrarily shaped two dimensional perfect electric conductor over a wide frequency band. The method of moments and the singular value decomposition technique were used to solve the eThe asymptotic waveform evaluation (AWE) technique was applied to the method of moments to calculate the radar cross section (RCS) of an arbitrarily shaped two dimensional perfect electric conductor over a wide frequency band. The method of moments and the singular value decomposition technique were used to solve the electric field integral equation, and the surface electric current density for a single frequency was obtained. In the AWE technique, the surface current on the perfect electric conductor is expanded in a rational function via the Padé approximation. Using the function, the electric current distribution can be obtained at any frequency within the given frequency range, which is used to compute the scattered fields and the wide band RCS. The employment of the singular value decomposition technique eliminates the interior resonance problem which suffered from the electric field integral equation. The numerical results are in good agreement with the results obtained by the method of moments at eacch frequncy.The computational efficiency is improved by more than an order of magnitude..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 469 (2002)
IMPLEMENTATION OF INTER -PULSES COSTAS FH HIGH RESOLUTION MMW RADAR SIGNAL USING DDS TECHNOLOGY
[in Chinese], [in Chinese], and [in Chinese]
A kind of high resolution radar signal (inter pulses Costas freguency hopping,or Costas FH) and a kind of direct digital synthesis (DDS) technique were introduced.A uniform expression of inter pulses Costas FH radar signal and stepped frequency pulsed radar signal was presented. A method to generate Costas FH radar sigA kind of high resolution radar signal (inter pulses Costas freguency hopping,or Costas FH) and a kind of direct digital synthesis (DDS) technique were introduced.A uniform expression of inter pulses Costas FH radar signal and stepped frequency pulsed radar signal was presented. A method to generate Costas FH radar signal from the signal set produced by DDS using so called "frequency selecting matrix"was also presented. The result shows that by using this method, certain flexibility of implementation of radar system, including software and hardware, may be increased..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 473 (2002)
A Ka BAND HMIC FRONT-END
[in Chinese], and [in Chinese]
The design method, manufacture and test results of a Ka band HMIC front end, which has been developed recently in SWIET, were reported. The front end, which is composed of a local oscillator module, a transmitter and a receiver, has not only good electrical performance, but also other merits such as miniature size, ligThe design method, manufacture and test results of a Ka band HMIC front end, which has been developed recently in SWIET, were reported. The front end, which is composed of a local oscillator module, a transmitter and a receiver, has not only good electrical performance, but also other merits such as miniature size, light weight and high reliability. Test results show that the output power of the transmitter is higher than 350 MW and the noise figure of the receiver is lower than 3.0dB in the used band..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2002
- Vol. 21, Issue 6, 477 (2002)
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