Journals >Opto-Electronic Engineering
Contents
2016
Volume: 43 Issue 5
16 Article(s)
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Research Article
Evaluation of Camouflage Jamming Effect on Spectral Imaging Based on Mean Absolute Difference
GAO Wei, SUN Peng, SUN Yifan, and DANG Dongni
To investigate and evaluate the jamming effect of broad-band camouflage on spectral imaging devices, camouflage jamming tests were carried out with a hyperspectral imager and a kind of broad-band camouflage net. The camouflage jamming effect on the hyperspectral imager was analyzed and evaluated quantitatively by usingTo investigate and evaluate the jamming effect of broad-band camouflage on spectral imaging devices, camouflage jamming tests were carried out with a hyperspectral imager and a kind of broad-band camouflage net. The camouflage jamming effect on the hyperspectral imager was analyzed and evaluated quantitatively by using the mean absolute difference. The results show that the broad-band camouflage net has certain jamming effect on the hyperspectral imager at all the spectral bands, and the markedness of camouflage jamming effect varies with the target characteristics before being camouflaged, camouflage net layers and the spectral band. By using the mean-absolute-difference rule, camouflage jamming effect on spectral imaging could be evaluated quantitatively and impersonally, which makes the evaluation results more accurate. So the mean-absolute-difference rule could be used as a quantitative and impersonal rule for evaluating the jamming effect on spectral imaging..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 1 (2016)
Test System for Absolute Spectral Response of SBUV Image Intensifier
CHEN Xue, LI Zongxuan, YAN Feng, ZHANG Mingchao, ZHOU Yue, and SUI Yongxin
To assess the solar blind image intensifier, a wide spectrum and large dynamic test system for absolute spectral response of solar blind UV image intensifier was designed and realized based on the standard alternative method. The test system took an ultra-high brightness, high stability broadband laser-driven EQ99 as tTo assess the solar blind image intensifier, a wide spectrum and large dynamic test system for absolute spectral response of solar blind UV image intensifier was designed and realized based on the standard alternative method. The test system took an ultra-high brightness, high stability broadband laser-driven EQ99 as the basic light source, the spectral-meter as the monochromator and the NIST calibrated silicon trap detector as the reference detector. It also achieved the low current measurement by using a high-accuracy electrometer and a variety of remedies. Experimental results indicate that the system covers spectrum of 200 nm ~ 630 nm and a dynamic range up to 106, and the uncertainty is less than 5.5%. The auto-test system is stable, high-precision and meets the solar blind image intensifier assessment requirement..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 8 (2016)
Feature Acquisition and Recognition of Point Target Based on Infrared Spectrum
LI Sujun, LIAO Sheng, REN Qifeng, and LI Qiang
In detection of distant target, it is difficult to extract target information effectively, which are the temperature, area, surface material type and other characteristics. According to the spectral emissivity, which is the inherent nature of an object, target material characteristics, structural characteristics and thIn detection of distant target, it is difficult to extract target information effectively, which are the temperature, area, surface material type and other characteristics. According to the spectral emissivity, which is the inherent nature of an object, target material characteristics, structural characteristics and the infrared radiation characteristics, an IR composite model is established based on two wavebands. Based on the model and material spectral emissivity, a method of feature extraction of target is proposed. In terms of the special target, the main categories of constituent materials used in constructing them are found. Meantime, the spectral emissivity of materials is measured. The correspondent database is established, which describes the relationship between the categories of constituent materials and spectral emissivity of materials. Based on the model and database, surface material type, radiant temperature and effective radiation area of target are obtained by using chicken swarm algorithm. The method has a good result..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 15 (2016)
Partial Area Method to Improve the Repeatability of Gas Raman Spectrum Intensity Measurement
KONG Dejing, ZHAI Zhongsheng, WANG Xuanze, HE Tao, XIONG Zhi, and LIU Zhiqiang
In view of the gas Raman spectrum analysis affected by many factors that lead to poor repeatability of measurement. A method which we called “partial area method” with higher accuracy and well stability is proposed to calculate the intensity of the Raman spectra by collecting and analyzing a large amount of spectral inIn view of the gas Raman spectrum analysis affected by many factors that lead to poor repeatability of measurement. A method which we called “partial area method” with higher accuracy and well stability is proposed to calculate the intensity of the Raman spectra by collecting and analyzing a large amount of spectral intensity data. What’s more, the influence of different area to calculate spectral intensity on measurement repeatability is compared. Experimental results show that using three-point area to calculate the intensity of the Raman spectra has smallest gas concentration fluctuation and most stable measurement result which is called best measurement repeatability under the design of optical systems and hardware conditions. Finally, the concentration of 10.0% C2H2 gas had been verified by the standard deviation of 100 sets of data which can reach 8.526 2×10-4. And the corresponding preliminary theoretical analysis is presented..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 20 (2016)
Non-destructive Detection of the Concentration of Sudan Red in Chili Powders Based on Hyper-spectral
ZHOU Yao, LI Baicheng, ZHAO Mantong, WANG Qi, and ZHANG Dawei
To detect the concentration of Sudan red No. 1 (C) in chili powders non-destructively, the hyper-spectral imaging technique was used to extract 120 chili powder images that had different C, including 60 for calibration set and rest for prediction set. Successive Projections Algorithm (SPA) was used to extract 45 effectTo detect the concentration of Sudan red No. 1 (C) in chili powders non-destructively, the hyper-spectral imaging technique was used to extract 120 chili powder images that had different C, including 60 for calibration set and rest for prediction set. Successive Projections Algorithm (SPA) was used to extract 45 effective wavelengths from large amount of spectra data in calibration set. Partial Least Squares Regression (PLSR), Multiple Linear Regression (MLR) and Principal Component Regression (PCR) were applied to set prediction models. As a result, better model to detect the C in chili powders was based on MLR. The Correlation Coefficient Calibration (Rc) and Root Mean Square Error of Calibration (ERMSC) were 0.998 and 0.737 3 μg/ml. The Correlation Coefficient Prediction (Rp) and Root Mean Square Error of Prediction (ERMSP) was 0.987 and 1.921 3 μg/ml. This demonstrates that the method can be successfully used for detecting the C in chili powders non-destructively..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 27 (2016)
Aliasing Problems of Space Cameras including Panchromatic and Multispectral Bands
TIAN Fuxiang, and HE Xin
At present, most space cameras contain not only panchromatic band with high resolution but also more and more multispectral bands. In order to obtain high signal to noise ratio of multispectral bands for this kind of space camera, sensors with big size element was applied for multispectral bands , so the system parametAt present, most space cameras contain not only panchromatic band with high resolution but also more and more multispectral bands. In order to obtain high signal to noise ratio of multispectral bands for this kind of space camera, sensors with big size element was applied for multispectral bands , so the system parameter Fλ/d turned smaller, and then aliasing problems appeared. Started from the model of sampling optical imaging system, the reasons for aliasing were analyzed, and the method to denote the extent of aliasing by spurious response was introduced. WordView-2 was taken as an example to analyze the aliasing problems of space cameras with panchromatic and multispectral bands. The results show that the aliasing of WordView-2’s panchromatic band is 7.35%, the aliasing of WordView-2’s multispectral bands is 14.76%~18.15%, and the latter is 2~2.5 times of the former. At last, the effects of aliasing and the measures to restrain aliasing were illustrated..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 35 (2016)
Environmental Adaptability Design of Space Mirror Subassembly
QU Lixin
In order to make space mirror have superior mechanical and thermal properties, dimensional stability analysis was crucial in the stage of the structural design. Lightweight structure of large aperture space mirror with a 1 200 mm × 450 mm caliber was designed. The mirror blank was made of SiC material. Triangular In order to make space mirror have superior mechanical and thermal properties, dimensional stability analysis was crucial in the stage of the structural design. Lightweight structure of large aperture space mirror with a 1 200 mm × 450 mm caliber was designed. The mirror blank was made of SiC material. Triangular lightweight holes were laid out on mirror back. The 3 points flexure support scheme was put forward and the mirror support structure was designed. Through analyzing the deformation of the mirror and its supporting structure under gravity load and temperature loads, matching the PV, RMS of the mirror surface shape, and the tilt angle which would be taken as the basis for revising design scheme. As shown as analysis results, under the load case of gravity in X direction, the PV 51.9 nm and RMS 9.2 nm, the tilt angle rotating around Z axis was 2.9 ". Under the action of 4 ℃ uniform temperature rise, the PV was 69.8 nm and RMS was 12.4 nm. The fundamental frequency of mirror subassembly was 173 Hz, which can meet the requirements of space applications..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 41 (2016)
Conformal Optical System Design and MTF Measuring
SUN Jinxia, LI Xianbing, WU Wei, PAN Guoqing, and DONG Guangpeng
An aerodynamic conformal dome calls for bullet shaped aspherical surfaces. The aspherical domes with gimbaled missile seeker have a large amount of dynamic aberrations varying with gimbal angle because of the non-rotationally symmetric character in non-zero field of regard. A fixed corrector is used to correct aberratiAn aerodynamic conformal dome calls for bullet shaped aspherical surfaces. The aspherical domes with gimbaled missile seeker have a large amount of dynamic aberrations varying with gimbal angle because of the non-rotationally symmetric character in non-zero field of regard. A fixed corrector is used to correct aberrations introduced by the ellipsoidal dome with fineness ratio 1.0 in our demonstrating conformal optical system. In this system, we use the gimbaled dome instead of the gimbaled inner optical system to simulate non-zero field of regard. The designed modulation transfer function of the simplified conformal seeker is higher than 0.5 and the encircled energy in one pixel is higher than 80% in all field of regard. The measuring result shows that the modulation transfer functions at 17 lp/mm are higher than 0.45 in small fields and higher than 0.25 in large field of regard..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 47 (2016)
The Design of Mold with Simulation for Chalcogenide Glass Precision Molding
WANG Zhibin, LI Junqi, ZHANG Feng, SU Ying, MAI Yuying, XU Xiaolei, and GE Yingchun
Compared with the manufacturing of the traditional infrared material, such as signal crystal germanium, zinc sulfide, zinc selenide etc, chalcogenide infrared glass is suit for precision molding for the low soften temperature to have large mass industry production. And the mold designing is one of the key technologies Compared with the manufacturing of the traditional infrared material, such as signal crystal germanium, zinc sulfide, zinc selenide etc, chalcogenide infrared glass is suit for precision molding for the low soften temperature to have large mass industry production. And the mold designing is one of the key technologies of precision glass molding. It takes the way of simulation method to design the mold. The mold processing of a sample chalcogenide glass from the technical drawing, mold design, molding to the lens are introduced. From the result of the precision molding, the technology of finite element simulation is a useful way to guiding the mold design. The molded lens by using mold process fit the design requirement..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 53 (2016)
Design of a Lens with Well Color Mixing of Red/Green/Blue LEDs
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The good color uniformity of multi-colored LED lighting is hard to get, especially in a short distance with a limited spreading angle. In order to address the issue, a design of a lens consisted of a collimator lens and fly-eye lens array is proposed. It achieves good color performance, so it is suitable for intelligenThe good color uniformity of multi-colored LED lighting is hard to get, especially in a short distance with a limited spreading angle. In order to address the issue, a design of a lens consisted of a collimator lens and fly-eye lens array is proposed. It achieves good color performance, so it is suitable for intelligent lighting. To find a balance between optical efficiency and color uniformity, the characteristics of the lens were analyzed by the real simulation. In the end, a lens with 20° divergence angle, 93% energy efficiency and good color performance in both short and long distance is shown to prove the feasibility of the design method..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 59 (2016)
Design of Optical Imaging Lens for Intelligent Transportation Monitoring System
WANG Kun, and LIN Feng
A wide waveband, large aperture and target optical imaging lens is designed by using Zemax software, which is applied to recognize license plate in intelligent transportation monitoring system. By using the infrared corresponding technology, the lens can still obtain clear imaging in the dark or night. The near infrareA wide waveband, large aperture and target optical imaging lens is designed by using Zemax software, which is applied to recognize license plate in intelligent transportation monitoring system. By using the infrared corresponding technology, the lens can still obtain clear imaging in the dark or night. The near infrared central wavelength is 850 nm. The Zemax multi-configuration design method is used to make visible light and near-infrared light confocal. According to the achromatic theory, appropriate material is chosen to eliminate chromatism and the maximum focal shift is 44 μm. After analyzing the lens application parameters, the F number is set to 1.2 and half field of view is 13°. In addition, the lens goes with Sony ICX841 CCD image sensor and the target surface is one inch. And the pixels size is 3.7 μm×3.7 μm. Furthermore, MTF of all fields are more than 0.3 at the spatial frequency of 135 lp/mm..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 65 (2016)
An Amplitude Association Dynamic Programming Track Before Detect Algorithm
GUO Yunfei, and ZHAO Shangyu
In order to detect and track low signal-to-noise ratio target, a new track before detect algorithm based on dynamic programming is proposed. The contributions consist of two aspects. Firstly, a new cost function method is proposed. It uses not only the measured amplitude information at current frame, but also uses amplIn order to detect and track low signal-to-noise ratio target, a new track before detect algorithm based on dynamic programming is proposed. The contributions consist of two aspects. Firstly, a new cost function method is proposed. It uses not only the measured amplitude information at current frame, but also uses amplitude association information between two consecutive frames. Secondly, an ergodic state backtracking algorithm with variable threshold is presented to detect new-born or vanished targets during the observation. Simulation results show the proposed algorithm effectiveness in detection performance..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 70 (2016)
Electro-optic Deflector Based on Negative Refraction Effect of Photonic Crystal
GAO Lun, LIANG Binming, WANG Ting, and CHEN Jiabi
An electro-optic deflector based on negative refraction effect of a two-dimensional Photonic Crystal (PC) infiltrated with liquid crystal was proposed. The deflector was achieved by applying the electric field which could rotate the angle of liquid crystal molecules. By using the Plane Wave Expansion method and 2D-finiAn electro-optic deflector based on negative refraction effect of a two-dimensional Photonic Crystal (PC) infiltrated with liquid crystal was proposed. The deflector was achieved by applying the electric field which could rotate the angle of liquid crystal molecules. By using the Plane Wave Expansion method and 2D-finite-difference time-domain (2D-FDTD) method on software RSoft CAD, negative refraction effect and the self-collimation effect of photonic crystal were demonstrated. The separation of light path and deflection could be realized by the negative refraction effect, and simulation data were analyzed. The result shows that the deflection range can be achieved up to 20° and the deflection angle linearly varies with the refractive indices..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 77 (2016)
Alignment Technology of Catadioptric Linear Array LWIR Sensor
ZUO Xiaozhou, SHEN Liangji, YANG Haicheng, HUI Gangyang, LIU Weiguang, JIANG Feng, and ZHAO Wei
A high-accuracy, standardize alignment technology is brought up, to adapt to the features and requirements of catadioptric linear array LWIR sensor, which are far-reaching, small F-number, and unable to staring imaged. The technique guarantees the accuracy of surface after alignment in the first place by using collimatA high-accuracy, standardize alignment technology is brought up, to adapt to the features and requirements of catadioptric linear array LWIR sensor, which are far-reaching, small F-number, and unable to staring imaged. The technique guarantees the accuracy of surface after alignment in the first place by using collimator and CMM which strictly controls the optical interval between the primary and secondary mirror, and then introduces wave front aberration measurement to adjust the tilt-errors and shift-errors of the primary and secondary mirror. After that, the method of reference conversion is adopted to line up the optical axis of the primary and secondary mirror and relay lens. At last, a linear detector is adopted to make adjustments to image and optical axis by using mirror. The paper introduces the key techniques in the alignment process such as centering by laser, microstress bond, alignment of the optical interval between the primary and secondary mirror, alignment for each lens, linear detector alignment etc. The results indicate that by introducing these technologies, the MDTD of the sensors can reach as high as 4 K, and the outdoor detection distance is more than 60 km. All the parameters meet design requirements..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 82 (2016)
Embedded Endoscopic Ultrasound Image Processing System Based on Wavelet Transform
SHI Yifeng, BAI Baoping, CHEN Xiaodong, WANG Yi, and YU Daoyin
During acquiring images, the equipment is affected by the size of the transducer and other factors which make the images have low contrast and big noise, cannot provide clear imaging basis for medical diagnostic. Scientists have proposed a variety of methods. However, these methods are mostly after-imaging processing aDuring acquiring images, the equipment is affected by the size of the transducer and other factors which make the images have low contrast and big noise, cannot provide clear imaging basis for medical diagnostic. Scientists have proposed a variety of methods. However, these methods are mostly after-imaging processing algorithms and having a poor real-time performance, unable to meet the real-time endoscopic ultrasound imaging requirements (25 frames/s). Therefore, this paper designs the embedded endoscopic ultrasound real-time image processing system based on lifting Wavelet Transform. And the system processes echo signals of each scan line with wavelet denoising, then obtains two-dimensional ultrasound images after CORDIC algorithm and interpolation processing using the imaging characteristics of circular scan and FPGA pipeline concept. Through building my own endoscopic ultrasound experimental system which makes the chicken tissue imaging use circular scan, the experiments show that the system imaging speed is up to 25 frames /s and SNR improves 3.8 dB, verifying the feasibility of the system..
Opto-Electronic Engineering
- Publication Date: Jan. 01, 1900
- Vol. 43, Issue 5, 88 (2016)
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