探测条件对红外热成像系统MRTD影响的研究
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摘要
在考虑目标的尺寸、探测等级、探测概率及大气环境等因素情况下,研究了热成像系统的最小可分辨温差(MRTD),建立了一个改进的MRTD模型。由于大气透过率与波长和距离相关,利用光谱等分法计算大气透过率,将探测波长范围等分为一个个窄波段,利用MODTRAN软件计算在一定大气条件和距离下每个窄波段的大气透过率。通过调用对应波长的透过率,计算了探测波长范围内热成像系统的MRTD,提高了MRTD的准确性和适用性。
Considering the factors such as the size of the target,the level of detection,detection probability and atmospheric environment,minimum resolvable temperature difference( MRTD) of thermal imaging systems is studied. An improved MRTD model is established. As atmospheric transmittance is related to wavelength and distance,atmospheric transmittance is calculated by spectral bisection method. Detection wavelength range can be divided into a series of equal narrow bands. The atmospheric transmittance of each narrow band is calculated by MODTRAN in a certain atmospheric condition and distance. Through the corresponding wavelength transmittance,MRTD of thermal imaging system is calculated. The accuracy and applicability of MRTD are improved by this method.
Considering the factors such as the size of the target,the level of detection,detection probability and atmospheric environment,minimum resolvable temperature difference( MRTD) of thermal imaging systems is studied. An improved MRTD model is established. As atmospheric transmittance is related to wavelength and distance,atmospheric transmittance is calculated by spectral bisection method. Detection wavelength range can be divided into a series of equal narrow bands. The atmospheric transmittance of each narrow band is calculated by MODTRAN in a certain atmospheric condition and distance. Through the corresponding wavelength transmittance,MRTD of thermal imaging system is calculated. The accuracy and applicability of MRTD are improved by this method.
引文
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[7]FAN Youchen,ZHAO Hongli,SUN Huayan,et al.Study on simulation of laser active imaging under atmospheric conditions[J].Laser&Infrared,2015,45(3):240-246.(in Chinese)范有臣,赵洪利,孙华燕,等.大气条件下的激光主动成像仿真研究[J].激光与红外,2015,45(3):240-246.
[2]Markin V A.Temperature-sensitivity limits of thirdgeneration thermal viewers[J].Opt Technol,2010,77:119-125.
[3]JIA Quantao,WU Ping,MA He.Calculation of operating range of infrared system using spectrum interval bisection method[J].Infrared and Laser Engineering,2012,41(10):2600-2603.(in Chinese)贾全涛,吴平,马鹤.利用光谱等分法对红外系统作用距离的计算[J].红外与激光工程,2012,41:2600-2603.
[4]ZHAO Yu,WU Ping,SUN Wenfang.Calculation of infrared system operating distance by spectral bisection method[J].Infrared Physic&Technology,2014,63(1):198-203.
[5]ZHANG Jingxian,LI Yudan,JIN Weiqi.Light and infrared imaging technology[M].Beijing:Beijing Institute of Technology Press,1995:229-254.(in Chinese)张敬贤,李玉丹,金伟其.微光与红外成像技术[M].北京:北京理工大学出版社,1995:229-254.
[6]WANG Jing,JI Ming,JING Ming,et al.Measurement and analysis of infrared imaging system’s MRTD under sinusoidal motion[J].Laser&Infrared,2013,43(5):526-531.(in Chinese)王晶,纪明,敬鸣,等.动态红外成像系统MRTD的测试与分析[J].激光与红外,2013,43(5):526-531.
[7]FAN Youchen,ZHAO Hongli,SUN Huayan,et al.Study on simulation of laser active imaging under atmospheric conditions[J].Laser&Infrared,2015,45(3):240-246.(in Chinese)范有臣,赵洪利,孙华燕,等.大气条件下的激光主动成像仿真研究[J].激光与红外,2015,45(3):240-246.