Journals >Journal of Infrared and Millimeter Waves
Contents
2001
Volume: 20 Issue 6
18 Article(s)
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Research Article
Contours embellishment using adaptive segmentation
[in Chinese], [in Chinese], and [in Chinese]
A novel method to get smooth contour in image segmentation process was presented. First, dynamic programming algorithm was adopted to process the least cumulative cost matrix of object image, and the optimum contour was extracted along the direction that the cumulative costs descend fastest. Then the contour was smoothA novel method to get smooth contour in image segmentation process was presented. First, dynamic programming algorithm was adopted to process the least cumulative cost matrix of object image, and the optimum contour was extracted along the direction that the cumulative costs descend fastest. Then the contour was smoothened and fitted by using adaptive cubic B spline, which adjusts the distribution of control points adaptively according to the contour curvature. Experiment results of many images showed that this method could effectively suppress tiny zigzags on contours and could produce smoother contour curve than other previous methods without losing the fine structures of the contours at the same time..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 6, 401 (2001)
SURFACE DEFECTS ON MBE GROWN HgCdTe
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The surface defects on MBE grown HgCdTe films on GaAs substrates were studied. The mechanism of surface defect formation was analyzed by SEM observations. The optimal growth conditions for obtaining a good morphological surface were determined. It was found that a variety of surface defects on epilayers are related to The surface defects on MBE grown HgCdTe films on GaAs substrates were studied. The mechanism of surface defect formation was analyzed by SEM observations. The optimal growth conditions for obtaining a good morphological surface were determined. It was found that a variety of surface defects on epilayers are related to the HgCdTe growth conditions and the substrate surface treatment. The average density of surface defects (larger than 2 μm) for HgCdTe epilayers was obtained to be 300 cm -2 , and the yield was 65%..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 406 (2001)
ASYMMETRY IN THE CHARACTERISTIC OF GaAs/AlGaAs QUANTUM WELL INFRARED PHOTODETECTOR
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The asymmetry in the characteristic of GaAs/AlGaAs quantum well infrared photodetector (QWIP) due to different Ga desorption rate upon opening /closing the Al shutter and different diffusion of Si doping in the quantum well during MBE growth was analyzed,and that in the parameters of GaAs/AlGaAs QWIP versus bias was diThe asymmetry in the characteristic of GaAs/AlGaAs quantum well infrared photodetector (QWIP) due to different Ga desorption rate upon opening /closing the Al shutter and different diffusion of Si doping in the quantum well during MBE growth was analyzed,and that in the parameters of GaAs/AlGaAs QWIP versus bias was discussed and compared with the materials and devices grown by MOVCD method. It was found that the asymmetry of QWIP grown by MBE is higher than that of QWIP grown by MOCVD..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 411 (2001)
FEATURE-POINT TRACKING BASED TIME-TO-CONTACT ESTIMATION FOR MOVING OBJECTS
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Time to contact (TTC) estimation problem between moving object and static observer was dealt with. A feature line based estimation scheme was proposed. And a TTC estimation system based on feature point tracking was presented. In addition, the feature point selection method, moving objects extraction, and feature pointTime to contact (TTC) estimation problem between moving object and static observer was dealt with. A feature line based estimation scheme was proposed. And a TTC estimation system based on feature point tracking was presented. In addition, the feature point selection method, moving objects extraction, and feature point tracking scheme were given in detail. The experiments of TTC estimation for three sets of the TTC labeled image sequences were done, and the results are satisfactory..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 415 (2001)
PHOTOLUMINESCENCE BEHAVIOR OF QUANTUM DOTS IN SPHERICAL GLASS MICROCAVITY
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Micrometer sized spherical glass microspheres were fabricated. CdSeS semiconductor nanometer clusters were incorporated into spherical microcavities. When a single microsphere was excited by a laser beam, the whispering gallery mode resonance of the photoluminescence of CdSeS quantum dots in the spherical microcavitiesMicrometer sized spherical glass microspheres were fabricated. CdSeS semiconductor nanometer clusters were incorporated into spherical microcavities. When a single microsphere was excited by a laser beam, the whispering gallery mode resonance of the photoluminescence of CdSeS quantum dots in the spherical microcavities was realized by the multiple total internal reflections at the spherical interface. The coupling of restricted electronic and photonic states was realized..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 421 (2001)
DECISION OF WORKING WAVEBAND AND AMBIENT TEMPERATURE COMPENSATION OF INFRARED THERMOMETRY IN KILN
[in Chinese], and [in Chinese]
The effecting factors of infrared radiation thermometry in oil fired kiln and the drawbacks of traditional temperature measurement methods were analyzed. The working waveband of infrared temperature transducer was decided according to the features of the gas in kiln and the configuration of the transducers to be used. The effecting factors of infrared radiation thermometry in oil fired kiln and the drawbacks of traditional temperature measurement methods were analyzed. The working waveband of infrared temperature transducer was decided according to the features of the gas in kiln and the configuration of the transducers to be used. A satisfactory result of less than 5 °C for elimination of gas effect was obtained. To counter the high ambient temperature round transducers, an ambient temperature compensation method for transducers was developed and a circuit design formula was derived, making the change of temperature indication of the transducers less than 0.3% of the temperature measured when the ambient temperature changes between 5～67 °C ..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 426 (2001)
CORRECTION OF DEVIATION BETWEEN THEORY AND EXPERIMENT FOR REFLECTION SPECTRUM OF BROAD-BAND ANTI-REFLECTION COATING
[in Chinese], [in Chinese], and [in Chinese]
By compensation of refractive index, changing the thickness, and using computer aided design, a method was studied for correcting the deviation between theory and experiment in the reflection curve when a broad band anti reflective coating was produced with vacuum coating process. The method gets a good result and is uBy compensation of refractive index, changing the thickness, and using computer aided design, a method was studied for correcting the deviation between theory and experiment in the reflection curve when a broad band anti reflective coating was produced with vacuum coating process. The method gets a good result and is used successfully in practical production..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 429 (2001)
REAL-TIME RECOGNITION OF INFRARED SMALL TARGETS IN COMPLICATED IR BACKGROUND
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new method for infrared (IR) warning system to recognize small targets in IR image sequences in real time in complicated IR background was presented. The system employs two dimensional digital filtering using Field Programmable Gate Array (FPGA), parallel processing of high speed Digital Signal Processor (DSP) and taA new method for infrared (IR) warning system to recognize small targets in IR image sequences in real time in complicated IR background was presented. The system employs two dimensional digital filtering using Field Programmable Gate Array (FPGA), parallel processing of high speed Digital Signal Processor (DSP) and target recognition algorithm based on target movement analysis. The system not only improves dim moving target capture capability in complicated background, accomplishes moving multi target automatic recognition, but also is capable of target overlapping prediction and target recapture. The system processing rate reaches 25 frames per second, and the system responding time is less than 1 second..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 433 (2001)
EFFECT OF SCALE FACTOR ON INFRARED RADIATIOIN CHARACTERISTICS OF MARINE EXHAUST SYSTEM WITH INFRARED SIGNATURE SUPPRESSION DEVICE AND ITS CORRECTION
[in Chinese], [in Chinese], and [in Chinese]
Based on the results of calculation and measurement of the two kinds of marine gas turbine exhaust systems with the infrared signature suppression devices, according to the similarity theory, the effects of scale factor on the temperature profile (of air flow and tube wall), and infrared radiant intensity(of exhaust plBased on the results of calculation and measurement of the two kinds of marine gas turbine exhaust systems with the infrared signature suppression devices, according to the similarity theory, the effects of scale factor on the temperature profile (of air flow and tube wall), and infrared radiant intensity(of exhaust plumes and exhaust uptake inner wall) of the exhaust system were analyzed and discussed. Based on the corresponding parameters of real ship exhaust systems as well as the magnitude of scale factor impacts, the recommended values for selecting the scale factor were estimated and presented..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 437 (2001)
OBJECT-FITTED FDTD METHOD BASED ON MEI-ABC
[in Chinese]
The finite difference time domain (FDTD) computational zone was truncated by an artificial boundary, of which the geometric shape was conformal with the boundary of an arbitrary shaped scatterer. The external conformal mesh was generated by the Thompson transformation.On the truncating boundary, the time domain measureThe finite difference time domain (FDTD) computational zone was truncated by an artificial boundary, of which the geometric shape was conformal with the boundary of an arbitrary shaped scatterer. The external conformal mesh was generated by the Thompson transformation.On the truncating boundary, the time domain measured equations of invariance (MEI) were applied as a local absorbing boundary condition. So the FDTD computational domain was compressed remarkably. The numerical experiment proved that the requirement of computer storage is reduced while the numerical accuracy is not decreased..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 442 (2001)
IMAGE ENHANCEMENT TECHNOLOGY FOR OUT-OF-FOCUS BLURRED IMAGE
[in Chinese], [in Chinese], and [in Chinese]
An algorithm to solve the blur problem of processed infrared defocused image based on the LIP model of Lee algorithm of image enhancement was presented. It can solve the blur problem after image enhancement to get clear image, and is easily realized and applied widely to image display technology. The principle of the aAn algorithm to solve the blur problem of processed infrared defocused image based on the LIP model of Lee algorithm of image enhancement was presented. It can solve the blur problem after image enhancement to get clear image, and is easily realized and applied widely to image display technology. The principle of the algorithm was introduced and the results of the algorithm to deal with the infrared defocused image of electrical device were analyzed..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 447 (2001)
APPLICATION OF 3-D PML ABSORBING BOUNDARY CONDITIONS TO THE ANALYSIS OF MICROSTRIP DISCONTINUITIES
[in Chinese], and [in Chinese]
The perfectly matched layer (PML) absorbing boundary conditions were extended from 2 D TE/TM modes problem to the case of 3 D hybrid modes transmission problem. Scattering characteristics of 3 D discontinuity structures in microstrip lines were successfully investigated. Numerical results show that the presented 3 D PMThe perfectly matched layer (PML) absorbing boundary conditions were extended from 2 D TE/TM modes problem to the case of 3 D hybrid modes transmission problem. Scattering characteristics of 3 D discontinuity structures in microstrip lines were successfully investigated. Numerical results show that the presented 3 D PML absorbing boundary condition maintains the advantage of wide band and high accuracy of ordinary 2 D PML. This technique can be further used in the FDTD analysis for complicated structures..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 451 (2001)
AUTOMATIC MEASUREMENT SYSTEM OF SUBMILLIMETER WAVE LASER
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An automatic measurement system of submillimeter wave laser was introduced, in which a single chip machine played an important part. This system automatized measurement and used double path emendation to increase veracity and reliability of measurement. The system was used to measure the spectrum of miniature opticallyAn automatic measurement system of submillimeter wave laser was introduced, in which a single chip machine played an important part. This system automatized measurement and used double path emendation to increase veracity and reliability of measurement. The system was used to measure the spectrum of miniature optically pumped NH 3 laser, demonstrating the high performance of the system..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 455 (2001)
NEW TARGET RECOGNITION METHOD OF WIDE-BAND MILLIMETER WAVE RADAR BY USING TIME DELAY NEURAL NETWORK
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Target recognition by using neural network based on high resolution range profile (HRRP) with wide band millimeter wave (MMW) radar was researched. Time delay neural network (TDNN) model and its learning algorithm to range profile sequence input were studied first, the TDNN target recognition method based on range profTarget recognition by using neural network based on high resolution range profile (HRRP) with wide band millimeter wave (MMW) radar was researched. Time delay neural network (TDNN) model and its learning algorithm to range profile sequence input were studied first, the TDNN target recognition method based on range profile sequence with wide band MMW radar was proposed. The effect of time delay unit number on classification precision and the performance of TDNN classifier using three typical aircraft dark room data measured with scale model were studied. The results show that the proposed method has good application prospects..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 459 (2001)
DESIGN OF MULTICHANNEL REAL-TIME IR IMAGE SIGNAL ACQUISITION AND PROCESSING SYSTEM
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The principle, composing and peculiarity of high precision real time IR image signal acquisition and processing system were introduced. 12 Bit A/D converter was selected in the system. DSP and CPLD were adopted, which make it suitable for high precision measurement in IR radiation charateristics.The principle, composing and peculiarity of high precision real time IR image signal acquisition and processing system were introduced. 12 Bit A/D converter was selected in the system. DSP and CPLD were adopted, which make it suitable for high precision measurement in IR radiation charateristics..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 464 (2001)
FDTD ANALYSIS FOR SATELLITE BFN CONSISTING OF RECTANGULAR COAXIAL LINES
[in Chinese], and [in Chinese]
The scattering characteristics of various rectangular coaxial line discontinuities, with which a satellite beamforming network (BFN) was built, were investigated by the finite difference time domain (FDTD) method. The scattering parameters were directly calculated through the simulation procedure of the wave propagatioThe scattering characteristics of various rectangular coaxial line discontinuities, with which a satellite beamforming network (BFN) was built, were investigated by the finite difference time domain (FDTD) method. The scattering parameters were directly calculated through the simulation procedure of the wave propagation, thus the analysis was tremendously simplified as compared with the mode matching method. Good agreement was found between the numerical results and the experimental data. The effectiveness and accuracy of the present method were thus justified..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 467 (2001)
RESEARCH ON IF FILTER USED IN FMCW MILLIMETER-WAVE RADAR
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The function of IF filter in the FMCW millimeter wave radar system was discussed considering that parasitic AM was the main factor that affects the detecting range of FMCW millimeter wave radar. The dependence of the detecting range of the radar on the performance of the IF filter was also analyzed. The results show thThe function of IF filter in the FMCW millimeter wave radar system was discussed considering that parasitic AM was the main factor that affects the detecting range of FMCW millimeter wave radar. The dependence of the detecting range of the radar on the performance of the IF filter was also analyzed. The results show that the detecting range of the radar is increased after the IF filter is optimized with HP CAD..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 472 (2001)
PERFORMANCE EVALUATION OF SAMPLED IMAGING SYSTEM
[in Chinese], [in Chinese], and [in Chinese]
With the use of FPA, the influence of sampling effects on the thermal imaging systems is so evident that people have to modify the evaluation and testing of imaging systems. The difference between sampled and non sampled imaging systems was discussed in this article. How to establish the evaluation and test system for With the use of FPA, the influence of sampling effects on the thermal imaging systems is so evident that people have to modify the evaluation and testing of imaging systems. The difference between sampled and non sampled imaging systems was discussed in this article. How to establish the evaluation and test system for the imaging systems was illustrated. The evaluation method and development of the sampled imaging system were introduced..
Journal of Infrared and Millimeter Waves
- Publication Date: Dec. 01, 2001
- Vol. 20, Issue 6, 477 (2001)
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