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Journal of Infrared and Millimeter Waves
Contents
2002
Volume: 21 Issue 1
19 Article(s)
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Research Article
Idenification on target profiles of mmw radar based on wavelet neural network
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An artificial neural network with the hidden layer consisting of wavelets was presented for the identification on target profiles of step frequency MMW radar. The good localization characteristics of wavelet functions in both time and frequency space allowed hierarchical multi-resolution learning of input-output data m
An artificial neural network with the hidden layer consisting of wavelets was presented for the identification on target profiles of step frequency MMW radar. The good localization characteristics of wavelet functions in both time and frequency space allowed hierarchical multi-resolution learning of input-output data mapping. The mathematic frame of the neural network and error back propagation algorithm were introduced. The procedure of the identification which uses wavelet neural network was described in detail. Then the presented approach was applied to the target profile identification of step frequency MMW radar. The results indicate that the method is valuable for target profile identification..
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Journal of Infrared and Millimeter Waves
Publication Date: Jan. 01, 1900
Vol. 21, Issue 1, 1 (2002)
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ELICITATION OF INFRARED RADIANT TRACK ALONG MERIDIAN COURSES OVER HUMAN BODYSURFACE BY LOCAL HEATING
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The infrared radiant track along meridian course(IRRTM)over human body surface could be elicited by local heating acupoint or non-acupoint along meridian course. The thermal conductivity of the corresponding tissues along meridian course was better than that of nonmeridain area. The physical character between the two w
The infrared radiant track along meridian course(IRRTM)over human body surface could be elicited by local heating acupoint or non-acupoint along meridian course. The thermal conductivity of the corresponding tissues along meridian course was better than that of nonmeridain area. The physical character between the two was really different in certain aspect. This discovery provided an important basis for further clarifying the mechanism of the appearance of IRRTM and the substantiality of its formation..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 6 (2002)
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OPERATIONAL MODULAR IMAGING SPECTROMETER
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Operational modular imaging spectrometer (OMIS), an advanced optical mechanical scanning imaging spectrometer was developed. It has 128 spectral bands ranging from visible to thermal infrared wavelength. Its application fields include geology, agriculture, forest, ocean, etc. The system designs, running configurations
Operational modular imaging spectrometer (OMIS), an advanced optical mechanical scanning imaging spectrometer was developed. It has 128 spectral bands ranging from visible to thermal infrared wavelength. Its application fields include geology, agriculture, forest, ocean, etc. The system designs, running configurations and functions of OMIS were introduced. Multiple examples of remote sensing applications of OMIS since 2000 were briefly given..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 9 (2002)
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COMPUTERIZED SIMULATION OF INFRARED IMAGES OF SHIP TARGETS ON THE SEA
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the simulation of infrared images of ships without any background, the principles and methods of computerized simulation of infrared images of ships in the ocean and atmosphere background were explored. The simulation is as follows: first, the ship target and the background, which consists of the atmosphere an
Based on the simulation of infrared images of ships without any background, the principles and methods of computerized simulation of infrared images of ships in the ocean and atmosphere background were explored. The simulation is as follows: first, the ship target and the background, which consists of the atmosphere and sea surface, were treated separately to obtain their independent infrared images; then the two images were combined into one image of the ship in the background. A series of typical infrared images were computed by using the authors' calculating and displaying softwares..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 14 (2002)
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ESTIMATING STABILITY PRECISION OF GYROSTABILIZER FROM REMOTE SENSING IMAGE
[in Chinese], and [in Chinese]
A new image-based method to estimate the stability precision of airborne gyrostabilizer was presented. From the PHI image data, the stability precision of the gyrostabilizer equipped with MOIS is ±4.33′.
A new image-based method to estimate the stability precision of airborne gyrostabilizer was presented. From the PHI image data, the stability precision of the gyrostabilizer equipped with MOIS is ±4.33′..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 19 (2002)
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DISLOCATION DENSITY OF MBE GROWN Hg
1-x
Cd
x
Te ON ZnCdTe SUBSTRATES*
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The dislocation density of MBE grown Hg 1-xCd xTe on ZnCdTe substrates was studied. It was found that the dislocation density in Hg 1-xCd xTe was sensitive to the damage layers of ZnCdTe substrates, growth conditions of HgCdTe as well as compositions. By optimizing the substrate preparation procedures and growth condit
The dislocation density of MBE grown Hg 1-xCd xTe on ZnCdTe substrates was studied. It was found that the dislocation density in Hg 1-xCd xTe was sensitive to the damage layers of ZnCdTe substrates, growth conditions of HgCdTe as well as compositions. By optimizing the substrate preparation procedures and growth conditions, the averaged EPD value of 4.2×10 5cm -2 with the standard deviation of 3.5×10 5cm -2 was obtained, close to the dislocation density limit of substrate. The reproducibility was good with a yield of 73.7% as screened by dislocation density. The results should be able to meet the requirements for FPAs of high performance..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 23 (2002)
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PHOTOLUMINESCENCE OF Te ISOELECTRONIC TRAPS IN ZnSeTe/ZnSe QUANTUM WELLS UNDER HYDROSTATIC PRESSURE
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The photoluminescence (PL) of ZnSe 0.92Te 0.08?ZnSe superlattice quantum wells at 77K under hydrostatic pressure up to 7.8 GPa was studied. Strong PL peaks from excitons trapped in isoelectronic traps in ZnSe 0.92Te 0.08 were observed. It was found that the pressure coefficients of the PL peaks from Te traps are about
The photoluminescence (PL) of ZnSe 0.92Te 0.08?ZnSe superlattice quantum wells at 77K under hydrostatic pressure up to 7.8 GPa was studied. Strong PL peaks from excitons trapped in isoelectronic traps in ZnSe 0.92Te 0.08 were observed. It was found that the pressure coefficients of the PL peaks from Te traps are about half of that of ZnSe. It demonstrates the localized characteristic of the potential of Te isoelectronic traps. The excitons transition between Te traps in ZnSe 1-xTe x and (CdSe) 1?(ZnSe) 3 superlattice was also investigated..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 28 (2002)
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FABRICATION OF Si CONCAVE MICROLENSES ARRAY
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
elements Si concave microlenses array was fabricated by a new method, i.e. the curvature inversion method. Scanning electron microscope (SEM) shows that microlenses have distinct concave cylinder contour. Surface stylus measurement shows that the concave microlenses array has smooth surface and uniform dimensions. For
elements Si concave microlenses array was fabricated by a new method, i.e. the curvature inversion method. Scanning electron microscope (SEM) shows that microlenses have distinct concave cylinder contour. Surface stylus measurement shows that the concave microlenses array has smooth surface and uniform dimensions. For the concave microlenses array, the average depth of concave spherical surface is 2.643μm, the nonuniformity of the depth is 8.45% and the average focal length is -47.08μm..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 33 (2002)
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STRUCTURAL AND OPTICAL PROPERTIES OF Ba
0.9
Sr
0.1
TiO
3
THIN FILMS PREPARED BY CHEMICAL SOLUTION ROUTES
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Ba0.9Sr0.1TiO3(BST) thin films were deposited on LaNiO 3 thin films by modified chemical solution routes. X-ray diffraction investigation shows that BST thin films are highly preferential (1?0?0)-orientation. Atomic force microscopy shows that the films have large size of 80~200 nm. The optical properties of the films
Ba
0.9
Sr
0.1
TiO
3
(BST) thin films were deposited on LaNiO 3 thin films by modified chemical solution routes. X-ray diffraction investigation shows that BST thin films are highly preferential (1?0?0)-orientation. Atomic force microscopy shows that the films have large size of 80~200 nm. The optical properties of the films were measured by spectroscopic ellipsometry in the photon energy range of 0.7~3.4 eV. Cauchy model was used to express the optical properties of BST thin films. Optical constants (refractive index n and extinction coefficient k) of the BST films were obtained. The band gap E*g of the BST films was determined to be 3.36 eV..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 37 (2002)
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EXPERIMENTAL RESEARCH ON SIMULATION OF PYROELECTRIC IRFPA IMAGING SYSTEM
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Pyroelectric IRFPA imaging system and its basic signal processing, including nonuniformity correction and signal difference, etc., were discussed. By the experiments with SSPA to simulate the pyroelectric IRFPA imaging system, the satisfied image was obtained. It lays foundations for the development of pyroelectric IRF
Pyroelectric IRFPA imaging system and its basic signal processing, including nonuniformity correction and signal difference, etc., were discussed. By the experiments with SSPA to simulate the pyroelectric IRFPA imaging system, the satisfied image was obtained. It lays foundations for the development of pyroelectric IRFPA imaging system..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 41 (2002)
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A SCHEME OF SOURCE-CHANNEL IMAGE CODING
[in Chinese], [in Chinese], and [in Chinese]
A new wavelet-based joint source-channel image coding scheme was proposed. For each subband, the statistical variable-coefficient fixed-length (VCFL) coding algorithm was applied, then different rate-compatible punctured convolutional (RCPC) code was used before transmission to provide unequal error protection (UEP). G
A new wavelet-based joint source-channel image coding scheme was proposed. For each subband, the statistical variable-coefficient fixed-length (VCFL) coding algorithm was applied, then different rate-compatible punctured convolutional (RCPC) code was used before transmission to provide unequal error protection (UEP). Given the total transmission bits, an optimal algorithm was used to minimize the total distortion. Simulation results show that the proposed scheme has higher compression ratio and performs well on channels with high bit error rate(BER)..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 44 (2002)
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IMAGE SEGMENTATION METHOD BASED ON A DEFORMABLE MODEL
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The image segmentation method based on deformable model was presented. The internal and external force fields were improved on the basis of a balloon's force field. By controlling the direction of the force field, Snakes were shrinked and split continuously, and at last the image was segmented into different sectio
The image segmentation method based on deformable model was presented. The internal and external force fields were improved on the basis of a balloon's force field. By controlling the direction of the force field, Snakes were shrinked and split continuously, and at last the image was segmented into different sections. The experiments of synthetic and real images show that the method is effective..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 49 (2002)
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SIMULATION OF REAL APERTURE RADAR SCENE
[in Chinese], [in Chinese], and [in Chinese]
By considering the uneven ground condition, the model of computing radar distinguishing unit was presented. On the basis of known SAR & DEM, the real-aperture radar scene was simulated.
By considering the uneven ground condition, the model of computing radar distinguishing unit was presented. On the basis of known SAR & DEM, the real-aperture radar scene was simulated..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 54 (2002)
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MULTI-DISTRIBUTION MODEL FOR BACKGROUND SUBTRACTION IN LONG-TERM VIDEO SURVEILLANCE SYSTEM
[in Chinese], [in Chinese], and [in Chinese]
The basic performance requirement of exploiting background subtraction approach in long-term color video surveillance system was described. To meet the requirement, an algorithm was also proposed. In this approach, by using the multi-distribution models in lightness and chromaticity spaces,the background model was buil
The basic performance requirement of exploiting background subtraction approach in long-term color video surveillance system was described. To meet the requirement, an algorithm was also proposed. In this approach, by using the multi-distribution models in lightness and chromaticity spaces,the background model was built. The multi-distribution models were then updated using independent mean and covariance updating rate and model replacing rate. When a pixel could be represented by more than one distribution model, the model which has the minimum similarity distance was updated. The approach also involves the detection of the sudden changes in illumination by the feedback of the information of foreground pixels and the suppression of shadow influenced by lightness information. Experiments show that the method satisfies the demands of long-term video surveillance..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 59 (2002)
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STUDY OF AUXILIARY FIELDS OF TIME EVANESCENCE IN ELECTROMAGNETIC NUMERICAL SIMULATIONS
[in Chinese], and [in Chinese]
By merging an attenuation factor into the Maxwell equations, a time evanescent auxiliary field was obtained. The characteristic of the auxiliary fields and its equations, and difference formulas were presented. The numerical examples show that the technique of artificial attenuation technique is efficient in analysis o
By merging an attenuation factor into the Maxwell equations, a time evanescent auxiliary field was obtained. The characteristic of the auxiliary fields and its equations, and difference formulas were presented. The numerical examples show that the technique of artificial attenuation technique is efficient in analysis of high-Q resonant circuits, and the same accuracy of numerical results as the conventional finite difference time domain method can be achieved..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 64 (2002)
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MOLECULAR BEAM EPITAXIAL GROWTH OF 3-in HgCdTe WAFER
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The recent results on molecular beam epitaxial growth of 3-in HgCdTe wafers were reported. The composition uniformity in the wafer was found to be 1.2% in a diameter of 70 mm, corresponding to a deviation in cutoff wavelength of 0.1 μm at 80 K. By refining the growth conditions, the surface morphology was significantly
The recent results on molecular beam epitaxial growth of 3-in HgCdTe wafers were reported. The composition uniformity in the wafer was found to be 1.2% in a diameter of 70 mm, corresponding to a deviation in cutoff wavelength of 0.1 μm at 80 K. By refining the growth conditions, the surface morphology was significantly improved. The defect density was reduced to below 300cm -2, and the defect size was suppressed to be smaller than 10μm. The material quality can meet the requirements of FPA fabrications..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 67 (2002)
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THEORETICAL CALCULATION OF DOPING OPTIMIZATION FOR p-on-n HgCdTe PHOTODIODE
[in Chinese], and [in Chinese]
By considering the main current mechanism in the long-wavelength HgCdTe photodiode, theoretical calculation of R 0A was done by choosing proper parameters. Calculations show that, given n side substrate concentration, the p side doping concentration should not be too large on considering the limitation of the tunneling
By considering the main current mechanism in the long-wavelength HgCdTe photodiode, theoretical calculation of R 0A was done by choosing proper parameters. Calculations show that, given n side substrate concentration, the p side doping concentration should not be too large on considering the limitation of the tunneling current,and vice versa. The relation of optimal concentration with the substrate concentration was calculated and the corresponding R 0A was also obtained..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 71 (2002)
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METHOD OF WAVELET THRESHOLD DENOISING BASED ON BAYESIAN ESTIMATION
[in Chinese], and [in Chinese]
A new image denoising method of wavelet shrinkage threshold based on Bayesian estimation was proposed. The coefficients of wavelet transform of image were estimated by minimizing Bayes risk in the proposed method. The estimation is not only related to the orientation and the level of the subband, but also to the wavele
A new image denoising method of wavelet shrinkage threshold based on Bayesian estimation was proposed. The coefficients of wavelet transform of image were estimated by minimizing Bayes risk in the proposed method. The estimation is not only related to the orientation and the level of the subband, but also to the wavelet coefficients. The experimental results show that the denoising effect of the proposed method is better than that of other methods based on wavelet shrinkage. Although the denoising effect of this method is worse than one of Wiener filters at low peak-signal-noise ratio, it is better than Wiener filters at high peak-signal-noise ratio..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 74 (2002)
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DISADVANTAGE OF THE METHODS BASED ON WAVELET TRANSFORM IN HIGH-RESOLUTION AND MULTISPECTRAL FUSION IMAGE
[in Chinese], [in Chinese], and [in Chinese]
Disadvantages of wavelet approaches were found by the authors as follows. When the scale of wavelet decomposition is small, mosaic occurs on the fusion image; when the scale of wavelet decomposition is large, color content of fusion image loses greatly, and when the scale of wavelet decomposition is equal to image size
Disadvantages of wavelet approaches were found by the authors as follows. When the scale of wavelet decomposition is small, mosaic occurs on the fusion image; when the scale of wavelet decomposition is large, color content of fusion image loses greatly, and when the scale of wavelet decomposition is equal to image size, mosaic disappears and color content degrades mostly. It was also found that the mosaic size is equal to the scale. The larger the scale is, the more degradation of color content will be. The reason of the above disadvantages was analyzed carefully based on one-dimensional signal model. Finally, experiments were given to illustrate the disadvantages of wavelet approaches..
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Journal of Infrared and Millimeter Waves
Publication Date: Feb. 01, 2002
Vol. 21, Issue 1, 77 (2002)
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