Journals >Journal of Infrared and Millimeter Waves
Contents
2004
Volume: 23 Issue 1
17 Article(s)
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Research Article
MICROSTRUCTURE OF CdSFILMS PREPARED WITH CHEMICAL PYROLYSIS DEPOSITION
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
CdS solid thin filmswere prepared on the substrates of slide glass or ITO coated glass by using chemicalpyrolysis deposition technique(CPD) at different deposition temperature from 350 to 540℃ during film growth. Some of theprepared CdS films were undergone thermal annealing treatments at temperature from 200 to600℃. TCdS solid thin filmswere prepared on the substrates of slide glass or ITO coated glass by using chemicalpyrolysis deposition technique(CPD) at different deposition temperature from 350 to 540℃ during film growth. Some of theprepared CdS films were undergone thermal annealing treatments at temperature from 200 to600℃. Themicrostructures of as-deposited CdS films before and after thermal annealing wereinvestigated with SEM, AFM and XRD measurements.It is found that hexagonal structure-likephase can be obtained for CdS films prepared with CPD when the deposition temperature isbelow 540℃. Wurtzitephase appears when CdS films are prepared at deposition temperature higher than 540℃, or the CdS films are preparedwith CPD at deposition temperature of 400℃ and post-annealed at the temperature above 500℃. The grain size of CdS films, which is dependent ondeposition temperature and on different substrates, is also discussed..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 1, 1 (2004)
FABRICATION OF ANTIREFLECTIVE SUBWAVELENGTH GRATING AT INFRARED 30μm REGION
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Antireflective subwavelength grating was designed by using rigorous coupled wave approach(RCWA). The square-pillar grating was fabricated by plasma assisted etching. Testing results show that the grating has a very good antireflective characteristic, and the values of testing parameters approximately equal to the desigAntireflective subwavelength grating was designed by using rigorous coupled wave approach(RCWA). The square-pillar grating was fabricated by plasma assisted etching. Testing results show that the grating has a very good antireflective characteristic, and the values of testing parameters approximately equal to the designed data. It indicates that the plasma assisted etching method is valid to fabricate deep groove grating. The experimental results are analyzed and discusssed. It is shown that the critical periodic point as a function of refractive index is very important to fabricate the antireflective aubwavelength grating..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 6 (2004)
STUDY ON HYPERSPECTRAL QUANTITATIVE MODEL OF CONCENTRATIONS FOR CHLOROPHYLL-a OF ALGA AND SUSPENDED PARTICLES IN TAILAKE
[in Chinese], [in Chinese], and [in Chinese]
The water from Tai Lake was analyzed by spectrum measurement and synchronous sampling with field portable spectroradiometer. The characteristic wave peaks of cyanobacteria and suspended particle were obtained from the spectra, and the corresponding relations between the heights of wave peaks and the concentrations of cThe water from Tai Lake was analyzed by spectrum measurement and synchronous sampling with field portable spectroradiometer. The characteristic wave peaks of cyanobacteria and suspended particle were obtained from the spectra, and the corresponding relations between the heights of wave peaks and the concentrations of chlorophyll a and suspended particle were built. As a result, a quantitative retrieval algorithm is deduced, and the algorithm is applied in the image acquired by OMIS imaging spectroradiometer..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 11 (2004)
NOVEL NONLINEAR PLL MODEL AND ITS APPLICATION IN 8MM INTEGRATED AUTOMOBILE ANTI-COLLISION RADAR
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel nonlinear PLL which can be used in VCO nonlinearity compensation was presented. By using the SAW(Surface Acoustic Wave) delay line to delay the FMCW signal, the IF signal can be locked on a reference frequency after mixing with the delayed VCO signal frequency and the undelayed. Based on this idea, the loop phaA novel nonlinear PLL which can be used in VCO nonlinearity compensation was presented. By using the SAW(Surface Acoustic Wave) delay line to delay the FMCW signal, the IF signal can be locked on a reference frequency after mixing with the delayed VCO signal frequency and the undelayed. Based on this idea, the loop phase model of this PLL was analyzed and simulated by using Agilent ADS. The CAD simulation results show that this kind of PLL can be used in VCO(Voltage Controlled Oscillator) nonlinearity compensation circuit conveniently..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 16 (2004)
RIGOROUS MODE MATCHING ANALYSIS OF TRANSMISSION CHARACTERISTICS FOR PERIODIC DIELECTRIC STRUCTURES
[in Chinese], and [in Chinese]
The transmission characteristics for different kind of periodic guiding structures were analyzed with a method of rigorous mode matching method combining with multimode network theory. The periodic structures include two types of periodic image waveguide filters: one is NRD guide dielectric filter with varying period, The transmission characteristics for different kind of periodic guiding structures were analyzed with a method of rigorous mode matching method combining with multimode network theory. The periodic structures include two types of periodic image waveguide filters: one is NRD guide dielectric filter with varying period, and the other is periodically and partially dielectric filled infinite rectangular guide. Experimental data indicate that the present method is accurate and effective..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 21 (2004)
EFFICIENT COMBINATION APPROACH OF CONFLICT EVIDENCE
[in Chinese], [in Chinese], and [in Chinese]
In order to efficiently combine highly conflict evidence, a new method based on the distance of the bodies of evidence was proposed. First, a distance function between the bodics of evidence was introduced. Then, the support degree and the credibility of each evidence were obtained. Finally, weighted averaging the evidIn order to efficiently combine highly conflict evidence, a new method based on the distance of the bodies of evidence was proposed. First, a distance function between the bodics of evidence was introduced. Then, the support degree and the credibility of each evidence were obtained. Finally, weighted averaging the evidence in the system, the Dempster combination rule was used to realize information fusion. Comparing with the existing methods, the proposed approach is more efficient in combining conflict evidence..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 27 (2004)
NEW ALGORITHM OF ADAPTIVE NONUNIFORMITY CORRECTION FOR IRFPA
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new adaptive multi-point nonuniformity correction algorithm for IRFPA was presented. The algorithm acquires the weights of detector working under a demarcated radiation by using adaptive filtering. The temperature floating of nonuniform IR images was removed by making use of the acquired weights. In the end, the muitA new adaptive multi-point nonuniformity correction algorithm for IRFPA was presented. The algorithm acquires the weights of detector working under a demarcated radiation by using adaptive filtering. The temperature floating of nonuniform IR images was removed by making use of the acquired weights. In the end, the muiti-point nonuniformity correction based on three order spline interpolation to the removed temperature floating IR images is made. The algorithm is with high correction precision, broad dynamic range and easy to realize in engineering..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 33 (2004)
PHOTOLUMINESCENCE OF Te ISOELECTRONIC CENTERS IN ZnS:Te UNDER HYDROSTATIC PRESSURE
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The photoluminescence of four epitaxial ZnS∶Te samples with Te concentration from 0.5% to 3.1% was investigated at different temperature and ambient pressure. Two well-known emission bands related to the isolated Te 1 and Te 2 pair isoelectronic centers were observed for the samples with Te concentrations of 0.5% and 0The photoluminescence of four epitaxial ZnS∶Te samples with Te concentration from 0.5% to 3.1% was investigated at different temperature and ambient pressure. Two well-known emission bands related to the isolated Te 1 and Te 2 pair isoelectronic centers were observed for the samples with Te concentrations of 0.5% and 0.65%. For the samples with Te concentrations of 1.4% and 3.1%, only was the Te 2-related peak observed. The pressure behaviors of these emission bands were studied at 15K. The Te 1-related band has faster pressure shift to higher energy than ZnS band gap. On the other hand, the pressure coefficient of Te 2-related bands is smaller than that of the ZnS band gap. According to a Koster-Slater model, we found that the increase of the density bandwidth of the valence band with pressure is the main reason for the faster shift of the Te 1 centers, while the relatively large difference in the pressure behavior of the Te 1 and Te 2 centers is mainly due to the difference in the pressure-induced enhancement of the impurity potential on Te1 and Te2 centers..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 38 (2004)
STUDY OF REAL TIME RECOGNITION TECHNIQUE FOR INFRARED IMAGING GUIDING SYSTEM SHIP TARGET
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The real time recognition technique of infrared imaging guiding system ship target was discussed and a new recognition algorithm of ship infrared imaging target was proposed. First, the binary image was produced by clustering method, then the possible target region was obtained by line region growing, finally, the realThe real time recognition technique of infrared imaging guiding system ship target was discussed and a new recognition algorithm of ship infrared imaging target was proposed. First, the binary image was produced by clustering method, then the possible target region was obtained by line region growing, finally, the real target was recognized by overall fuzzy evaluating technique. This algorithm was transplanted to our DSP hardware system. The experimental result shows that is good and feasible..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 43 (2004)
INFRARED OPTICAL PROPERTIES OF Bi2Ti2O7 THIN FILMS PREPARED BY CHEMICAL SOLUTION DECOMPOSITION TECHNIQUE
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Bi2Ti2O7 thin films were deposited on n-GaAs(100) by chemical solution decomposition technique. The infrared optical properties of the thin films were measured by infrared spectroscopic ellipsometry in the wavelength range of 2.8～12.5μm. Lorentz-Drude dispersion model was used to express the infrared dielectric constanBi2Ti2O7 thin films were deposited on n-GaAs(100) by chemical solution decomposition technique. The infrared optical properties of the thin films were measured by infrared spectroscopic ellipsometry in the wavelength range of 2.8～12.5μm. Lorentz-Drude dispersion model was used to express the infrared dielectric constants of the Bi2Ti2O7 thin films, and the refractive index n, the extinction coefficient k and the absorption coefficient α of the thin films were calculated. The thickness of the Bi2Ti2O7 thin films was obtained as 139.2 nm by fitting..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 47 (2004)
PHASE REMATCH ON HIGH-POWER MILLIMETER WAVE MODE CONVERTER
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the mode coupling theory,the optimal analysis of TM 01-TE 11overmoded circular waveguide mode converter geometric configuration with the different phase rematch and structure is given. The regulation about the radivs of the circular waveguide,curvature of bent circular waveguides,frequency and the bandwidth isBased on the mode coupling theory,the optimal analysis of TM 01-TE 11overmoded circular waveguide mode converter geometric configuration with the different phase rematch and structure is given. The regulation about the radivs of the circular waveguide,curvature of bent circular waveguides,frequency and the bandwidth is obtained. The results are contributed to design corresponding circular waveguide mode converter with the tight,the efficient and the wideband..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 51 (2004)
MODEL FOR SEA CLUTTER BASED ON NEURAL NETWORK
[in Chinese], [in Chinese], and [in Chinese]
The dynamic model of sea clutter based on phase space reconstruction was presented. The model parameters obtained by neural network were employed to cancel sea clutter in radar echo by prediction. Real clutter data collected by radar were used to test the model. The result illustrates good performance in sea clutter caThe dynamic model of sea clutter based on phase space reconstruction was presented. The model parameters obtained by neural network were employed to cancel sea clutter in radar echo by prediction. Real clutter data collected by radar were used to test the model. The result illustrates good performance in sea clutter cancellation..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 55 (2004)
MODIFICATION OF MOTION AND BACKGROUND CLUTTER ON IR IMAGING SYSTEM PERFORMANCE MODEL
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
On the basis of the IR imaging system static performance model, the effect of linear motion, sinusoidal motion and random motion on the system performance were theoretically analyzed with the motion transfter function. Additionally, detection criteria modified by background clutter was introduced, and dynamic performanOn the basis of the IR imaging system static performance model, the effect of linear motion, sinusoidal motion and random motion on the system performance were theoretically analyzed with the motion transfter function. Additionally, detection criteria modified by background clutter was introduced, and dynamic performance model was established and simulated. The modeling result shows that the influence of motion and background clutter on the system field performance should not be ignored..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 59 (2004)
FABRICATION OF VANADIUM OXIDES POLYCRYSTALLINE THIN FILM FOR UNCOOLED IR DETECTORS
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Polycrystalline Vanadium Oxides thin films deposited on Si(110) and quartz substrates for thermo-sensitive material of uncooled IR detector arrays were fabricated by ion beam sputtering deposition and oxide process.SEM photography indicates that VO x thin films with acerose crystal constructor are smooth, compact and uPolycrystalline Vanadium Oxides thin films deposited on Si(110) and quartz substrates for thermo-sensitive material of uncooled IR detector arrays were fabricated by ion beam sputtering deposition and oxide process.SEM photography indicates that VO x thin films with acerose crystal constructor are smooth, compact and uniform. The test result shows that the square resistance and the temperature coefficient of resistance(TCR) of the VO x thin film are 50KΩ and -0.021K-1 at 20℃, respectively..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 64 (2004)
INFRARED WEAK TARGET DETECTION BASED ON CORRELATION ANALYSIS OF MULTI-FRACTAL SINGULARITY SPECTRAL
[in Chinese], [in Chinese], and [in Chinese]
Aiming at the characteristic of the infrared image, which is low contrast, complex background and seriously noise interfered in target, a kind of detection method was proposed by using the correlation among the pixel. The method is based on the correlation analysis for the multifractal singularity spectral. ExperimentaAiming at the characteristic of the infrared image, which is low contrast, complex background and seriously noise interfered in target, a kind of detection method was proposed by using the correlation among the pixel. The method is based on the correlation analysis for the multifractal singularity spectral. Experimental results show that this method is available for suppression of the random noises and the influences from the complex background of ocean and sky..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 67 (2004)
STUDY ON AT TENUATION PERFORMANCE OF EXPANDED GRAPHITE AT THE BANDS OF 3mm AND 8mm
[in Chinese], [in Chinese], and [in Chinese]
The millimeter wave attenuation performance of expanded graphite at 3mm and 8mm wavelength was studied by static experiments. The comparative experiment using aluminum chaff, which is a kind of well-known millimeter wave countermeasure material, was also done. The results show that the attenuation of expanded graphite The millimeter wave attenuation performance of expanded graphite at 3mm and 8mm wavelength was studied by static experiments. The comparative experiment using aluminum chaff, which is a kind of well-known millimeter wave countermeasure material, was also done. The results show that the attenuation of expanded graphite at 3mm and 8mm wavelength are 17.0dB and 16.6dB respectively, and the attenuation of aluminum chaff are 7.4dB and 4.1dB. It means that the expanded graphite could be a better millimeter wave countermeasure material. The optimal particle size(including diameter and length) of expansive graphite that achieves the maximal attenuation was also obtained by experiments. These results could be a valuable reference for the design of full band screen smoke..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 72 (2004)
STUDY ON PASSIVE DISTANCE MEASUREMENT OF GROUND OBJECTS BY INFRARED RADIATION
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The infrared transmission of ground object and its background were discussed. A new passive distance measuring method was deduced based on the irradiance errors between the ground object and its background detected. By the above-mentioned new method, the formula of distance measuring and the formula of distance resolviThe infrared transmission of ground object and its background were discussed. A new passive distance measuring method was deduced based on the irradiance errors between the ground object and its background detected. By the above-mentioned new method, the formula of distance measuring and the formula of distance resolving power were formed. The relationship between the irradiance errors and the distance, and the relationship between the distances resolving power and the distance under different weather conditions were calculated. The calculation result has proved that the method can be applied to the distance measurement of ground objects..
Journal of Infrared and Millimeter Waves
- Publication Date: Feb. 01, 2004
- Vol. 23, Issue 1, 77 (2004)
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