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Lin J.,The Science and Technology on Optical Radiation Laboratory | Lin J.,Changfeng Electromechanical Technology Design Academy | Bao X.,The Science and Technology on Optical Radiation Laboratory | Wu J.,The Science and Technology on Optical Radiation Laboratory | Dong Y.,The Science and Technology on Optical Radiation Laboratory
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2016

High temperature exhaust plumes of warship power system is an important source of infrared radiation. In this paper, the flow field of ship exhaust plumes was calculated based on CFD methods. Then, a calculation method of high temperature exhaust plume's infrared radiation was obtained by utilizing the C-G approximation method laced on a narrow-band model. Based on this model, the influence of the combined speed on the flow field and the infrared radiation of ship exhaust plumes were analyzed. According to the simulated result, the combined speed has an obvious influence on the shape and distributing area of the exhaust plumes. In addition, when the combined speed increased, the average radiation intensity of ship exhaust plumes decreased about 48.1 percent in the mid-wavelength infrared range. The physical factors for the error of the simulation model are discussed preliminarily.The carbon particles caused by the incomplete combustion have a significant impact on the plumes'infrared radiation transmission. © 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.


Yang Z.,The Science and Technology on Optical Radiation Laboratory | Guo J.,The Science and Technology on Optical Radiation Laboratory | Tong H.,The Science and Technology on Optical Radiation Laboratory | Jiang W.,The Science and Technology on Optical Radiation Laboratory | Wang X.,The Science and Technology on Optical Radiation Laboratory
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

Using the combination of blackbody and collimator is one of the important means for infrared radiation calibration. However, due to the presence of thermal radiation, stray radiation nosie will be transmitted to the detector, generating calibration error and affecting calibration accuracy. In this paper, the stray radiation theoretical model of collimator was established, and the stray radiations of mirror surface under different working temperatures or surface emissivities were analyzed quantitatively to determine the impact on infrared radiation calibration. At the same time, some corrective measures for stray radiation were given to remove the impact on the infrared radiation calibration caused by stray radiation and improved the infrared radiation calibration accuracy. ©, 2014, Chinese Society of Astronautics. All right reserved.


Tong H.,The Science and Technology on Optical Radiation Laboratory | Ma Y.,The Science and Technology on Optical Radiation Laboratory | Lu Y.,The Science and Technology on Optical Radiation Laboratory | Zhu X.,The Science and Technology on Optical Radiation Laboratory
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

The infrared radiation characteristic is an important basis for detection and identification of dim target. The acquisition of the infrared radiation characteristic of dim target needs to utilize the large diameter calibrated equipment. Spatial filter IR spectrometer can be utilized in the observation of dim target. A radiant calibration method was studied in this paper which could be applied in large diameter IR spectrometer calibration system. With this method, the radiant existance of channels around the aperture of the spectrometer measuring system was calculated according to the standard multispectral infrared radiation supplied by the combination of blackbody and collimator tube, and it was applied into the calibration of long, short and medium wave infrared. The calibration curve was fitted with the least square method and the actual calibration result was presented. The origin and combined result of calibration uncertainty was analyzed, the combined calibration uncertainty was below 10%, which met the calibration requirement of large diameter spectrometers.

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