应用光学
應用光學
응용광학
JOURNAL OF APPLIED OPTICS
2014年
6期
1094-1098
,共5页
胡铁力%马世帮%郭羽%辛舟%李四维%解琪%刘瑞星%范纪红%张玫%谢毅%刘军宁
鬍鐵力%馬世幫%郭羽%辛舟%李四維%解琪%劉瑞星%範紀紅%張玫%謝毅%劉軍寧
호철력%마세방%곽우%신주%리사유%해기%류서성%범기홍%장매%사의%류군저
红外热像仪%空间噪声%固定模式噪声%时间噪声%NETD
紅外熱像儀%空間譟聲%固定模式譟聲%時間譟聲%NETD
홍외열상의%공간조성%고정모식조성%시간조성%NETD
infrared thermal imager%spatial noise%fixed pattern noise%temporal noise%noise equivalent temperature difference
凝视阵列型热像仪的空间噪声制约着热像仪对远距离目标的探测、分辨、跟踪性能。为解决热像仪空间噪声实际测量问题，分析了热像仪的空间噪声测量原理，给出了热像仪基于信号传递函数的空间噪声测量数学模型，介绍了热像仪某一组、某一区域或全部像素如何剔除时间域NETD ，再通过统计计算得到其空间NETD的数学模型。对制冷型MCT320×256凝视列阵热像仪的SiT F和空间NETD进行测量，当背景黑体温度为5℃时，FOV区域中心信号传递函数（SiTF）为27．29 mV/℃，NETD为0．128℃，20℃时 FOV 区域中心SiTF为29．03℃， NETD为0．121℃。测量结果表明：该方法可评估空间噪声对热像仪性能的影响。
凝視陣列型熱像儀的空間譟聲製約著熱像儀對遠距離目標的探測、分辨、跟蹤性能。為解決熱像儀空間譟聲實際測量問題，分析瞭熱像儀的空間譟聲測量原理，給齣瞭熱像儀基于信號傳遞函數的空間譟聲測量數學模型，介紹瞭熱像儀某一組、某一區域或全部像素如何剔除時間域NETD ，再通過統計計算得到其空間NETD的數學模型。對製冷型MCT320×256凝視列陣熱像儀的SiT F和空間NETD進行測量，噹揹景黑體溫度為5℃時，FOV區域中心信號傳遞函數（SiTF）為27．29 mV/℃，NETD為0．128℃，20℃時 FOV 區域中心SiTF為29．03℃， NETD為0．121℃。測量結果錶明：該方法可評估空間譟聲對熱像儀性能的影響。
응시진렬형열상의적공간조성제약착열상의대원거리목표적탐측、분변、근종성능。위해결열상의공간조성실제측량문제，분석료열상의적공간조성측량원리，급출료열상의기우신호전체함수적공간조성측량수학모형，개소료열상의모일조、모일구역혹전부상소여하척제시간역NETD ，재통과통계계산득도기공간NETD적수학모형。대제랭형MCT320×256응시렬진열상의적SiT F화공간NETD진행측량，당배경흑체온도위5℃시，FOV구역중심신호전체함수（SiTF）위27．29 mV/℃，NETD위0．128℃，20℃시 FOV 구역중심SiTF위29．03℃， NETD위0．121℃。측량결과표명：해방법가평고공간조성대열상의성능적영향。
The spatial noise on staring array thermal imager restricts its capability in detecting , distinguishing and tracking the long distance targets .To solve the problem in measuring the thermal imager spatial noise ,its measuring theory was analyzed and the mathematical model for measuring the spatial noise based on signal transfer function (SiTF) was presented .After removing the temporal noise equivalent temperature difference (NETD) from the noise of a certain group or district or the whole pixels in thermal imager ,the spatial NETD model was calculated through analyzing statistically the noise of those pixels .In measuring the SiT F and spatial NETD of cooled MCT320 × 256 thermal imager ,when the temperature of the back‐ground blackbody is 5 ℃ ,the SiTF of central district in field of view(FOV) is 27 .29 mV/℃ , and the spatial NETD is 0 .128 ℃ .When the temperature of the background blackbody is 20 ℃ ,the SiTF of central district in FOV is 29 .03 mV/℃ ,and the spatial NETD is 0 .121 ℃ .The measuring results show that the measuring method can evaluate the influence of spatial noise on the perform‐ance of thermal imager .
