Wang T.,Huayin Ordnance Test Center |
Zhong S.,Wuhan University
Chinese Journal of Sensors and Actuators | Year: 2014
According to the problem of aerial missile's firing detection, the detecting way based on visual image is put forward. The system structure and workflow are designed. The moving target capturing and tracking are introduced. The ignition multiple characteristics finding are expounded. The system's monitor range is 10 m~3 000 m. The detecting real time is less than 20 ms, The system capabilities are verified many times during the anti-interference test for aerial missiles. The results indicate that error reporting and missing reporting are not happened. ©, 2014, Guojia Jiaowei Quanguo Gaoxiao Chuangan Jishu Yanjiuhui. All right reserved.
Wu H.,Xi'an Jiaotong University |
Wu H.,Huayin Ordnance Test Center |
Zhang C.,Xi'an Jiaotong University |
Bai X.,Xi'an Jiaotong University
Optics Communications | Year: 2010
A complete description of polarization and transmission of light in a uniaxial birefringent plate with arbitrary crystal axis direction is detailedly presented. A general case with nonnormal incidence in spatial domain is considered. The universal theoretical model is build up by referring to all the impact factors including the incident angle, the incident wavelength, the azimuth angle, and the optical axis direction of crystal plate. The simulated results show that the ordinary ray and extraordinary ray in birefringent crystal have unique polarization direction and distinct energy transmission property, respectively. The explicit representation in this paper allows a comprehensive analysis and determination for the polarization performance and transmission characteristics of light in various uniaxial birefringent components, and especially it is simple and clear in physical picture. © 2010 Elsevier B.V. All rights reserved.
Li J.,Xi'an Jiaotong University |
Zhu J.-P.,Xi'an Jiaotong University |
Wu H.-Y.,Huayin Ordnance Test Center |
Hou X.,Xi'an Jiaotong University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011
We propose a compact, miniature static Fourier transform imaging spectropolarimeter (SFTISP). The spectropolarimeter is formed by cascading two high order crystal retarders and a Wollaston birefringent interferometer. Compared with previous instruments, the most significant advantage of the described model is that without any internal moving parts, electrically controllable or micro-components, the entire wavelength-dependent state of polarization (SOP) is acquired simultaneously along a one-dimensional spatial image by a single snapshot. Also, we show that in this configuration we can benefit from the advantages of the element: compact, robust and high throughput of the Wollaston birefringent interferometer. The theory of the birefringent SFTISP is provided, followed by details of its specific embodiment. A simulation and an experimental demonstration of the sensor are also presented. The core optics of the breadboard sensor is as small as 8×Φ 3.5 cm3 in size. The operation spectral range is from 450 nm to 850 nm. The experiment results were shown to yield accuracy better than 3% over most of the operation spectral band. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
Li J.,Xi'an Jiaotong University |
Zhu J.,Xi'an Jiaotong University |
Wu H.,Huayin Ordnance Test Center
Optics Letters | Year: 2010
The theoretical operation and experimental demonstration of a Fourier transform imaging spectropolarimeter for real time measurement of the polarization state of light are presented. The spectropolarimeter uses a Wollaston prismas a birefringent interferometer and two high-order retarders to incorporate channeled polarimetry. Compared with previous instruments, the most significant advantage of the described model is that the complete wavelength-dependent polarization is acquired simultaneously along a one-dimensional spatial image by a single snapshot. Also, we show that, in this configuration, we can benefit from the advantages of the model: it is compact and robust, and the birefringent interferometer has a high throughput. © 2010 Optical Society of America.
Zhao X.,Xi'an Jiaotong University |
Zhao X.,Huayin Ordnance Test Center |
Zhang B.,Xi'an Jiaotong University |
Li Y.-M.,Xi'an Jiaotong University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016
The wave propagation approach and Galerkin method were employed to study the influence of the simply-supported and clamp-supported boundary conditions at both ends on natural frequency and acoustic radiation of a truncated orthotropic conical shell. In order to validate the present analysis, the theoretical results were compared with those in published literatures and those by numerical simulation. The results indicate that the influences of simply-supported and clamp-supported boundary conditions are related to the half cone angle and the ratio of elasticity moduli in meridianal and circumferential directions. The natural frequencies of the orthotropic conical shell with clamp-supported boundary are greater than those with simply-supported boundary for the larger half cone angle, but the natural frequencies of the orthotropic conical shell with simply-supported boundary are only slightly larger than those with clamp-supported boundary under the modes with large circumferential wave number for the smaller half cone angle as the ratio of elasticity moduli is smaller. With the increase of the half cone angle, the effects of the two boundary conditions on the natural frequencies and sound pressure level both increase. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.
Guo D.,Lanzhou University |
Guo D.,Huayin Ordnance Test Center |
Dong Z.,Lanzhou University |
Luo C.,Lanzhou University |
And 3 more authors.
RSC Advances | Year: 2014
A novel selective fluorescent chemosensor L based on rhodamine B derivative has been designed and synthesized to optically detect Cu2+ and S2- in aqueous buffer solution. The fluorescence of L was excited by Cu2+ with a 1:1 binding ratio, and could be used as a "turn-on" type sensor. Otherwise, the emission band would undergo a slight red-shift. Once binding with Cu2+, the copper complex can exhibit high selectivity for S2-. Upon addition of Cu2+, the color of the chemosensor L changes from colorless to pink. Additionally, the resulting pink solution changes to colorless immediately upon the addition of S2-. However, no phenomenon change could be observed in the presence of other anions. Conclusively, the color changes suggest that sensor L could serve as a "naked-eye" sensor for Cu2+ and S2-. © 2014 The Royal Society of Chemistry.
Duan Y.,National University of Defense Technology |
Jing P.,Huayin Ordnance Test Center |
Niu Z.,National University of Defense Technology |
Chen Z.,National University of Defense Technology
Journal of Applied Remote Sensing | Year: 2016
Image smear, produced by the shutter-less operation of full-frame charge-coupled device (CCD) sensors, greatly affects the performance of target detection, the centering accuracy, and visual magnitude estimation. We study the operation principle of full-frame CCDs, analyze the cause and properties of smear effect, and propose a smear removal algorithm for star images of full-frame CCDs. The proposed method locates the smears and extracts the rough profiles of the smeared stars by finding the conditional extrema. Then Gaussian fitting is applied to accurately extract the stars, in order to maintain the integrity of star images while minimizing the smear effect. The extraction of smears and stars requires parameters such as the size of the CCD, the integration time and the readout time, as well as the estimation of background noise. We assess the performance of our scheme with real observed data. The experimental results show that the proposed scheme improves the average signal-to-noise ratio of the images by about 22%, presenting better smear removal performance compared with several published methods. The limitation of the proposed algorithm includes the difficulty of distinguishing between two very close stars displaying the gray level of a single peak and overestimation of the background noise may also influence the performance of the algorithm. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).
Wang T.,Huayin Ordnance Test Center |
Gao G.,Norinco Group Test and Measuring Academy
Guangxue Jishu/Optical Technique | Year: 2016
The indicating value of collimator's angle scale is used commonly to calibrate the small angle optical instruments. In shooting range test, it is used to calibrate sighting instruments for cannon such as borescope, sighting telescope. The indicating value is required to calibrate and traced the source at regular intervals. The way of calibrating the indicating value of collimator's angle scale is put forward. The practical measuring mathematics model is founded. The results of measuring experiment and assessing uncertainty prove that this method can satisfy the calibration demand. © 2016, Editorial Board of Optical Technique. All right reserved.
Lin Z.,Anhui University of Science and Technology |
Tao J.,Anhui University of Science and Technology |
Zheng Z.,Huayin Ordnance Test Center
International Conference on Signal Processing Proceedings, ICSP | Year: 2012
In this paper, we introduce a new approach for general purpose reduced-reference image quality assessment (RRIQA) based on the average directional information (ADI), which is obtained from complex wavelet coefficients. The dual-tree complex wavelet transform (DT-CWT) possessing more excellent properties than the discrete wavelet transform (DWT) such as shift invariance and multi-directional selectivity is used to produce complex wavelet coefficients. Then the inter-coefficient product (ICP) is computed to represent the feature orientation (through the complex phase) and the feature strength (through the complex magnitude). We consider the distortion progress affect the directional features in the reference image, so the difference between the ADI of the distorted image and the reference image can be an indicator that quantizes the degree of degradation. The experiments are performed based on LIVE database, and the results show that the proposed approach is comparable to PSNR and some of the state-of-the-art RR approaches, meanwhile has relatively small size of RR features. © 2012 IEEE.
Li B.,Huayin Ordnance Test Center |
Rong X.,Huayin Ordnance Test Center |
Zhang S.,Huayin Ordnance Test Center |
Wu H.,Huayin Ordnance Test Center
Journal of Applied Optics | Year: 2015
To solve the existing problems such as multi-station setting complexly and high single station accuracy demanding in pose measurement of flying targets, a new optical method for pose measurement was proposed. The method made full use of the continuous image information and the corresponding target flight trajectory position data. First, starting point of target axis vector was determined by the target location data, and also the end point was acquired by the constraint equations of target axis vector. Then, the pose angles (including the yaw angle and pitch angle) could be calculated according to the relationship between the pose angles and the axial vector. Finally, the unique pose value could be obtained by the prior information. The corresponding simulation and accuracy analysis were performed, and the results show that the attitude measurement error is less than 1°, and the method proposed in this paper considering both the convenience and accuracy of measurement, has high application value. ©, 2015, Editorial Board, Journal of Applied Optics. All right reserved.