红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2014年
1期
1-5
,共5页
自身热辐射%红外成像系统%数值模拟
自身熱輻射%紅外成像繫統%數值模擬
자신열복사%홍외성상계통%수치모의
self-emitted thermal radiation%infrared imaging system%numerical simulation
在红外探测系统中,当目标信号比较弱时,少量的杂散光引起的噪声就会大大降低系统的输出信噪比,从而降低系统的探测能力。对于高灵敏红外成像探测系统和低冷辐射环境模拟系统,系统自身热辐射将成为杂光的最大来源。文中分析说明了系统自身热辐射杂光的确定性和近场性,提出了一种新的基于光线光学的计算模型,讨论了计算模型中的一些关键问题和解决方法,并编程实现了对近场物体杂散辐射的精确数值模拟与仿真。得到了杂光在探测器上的辐照度分布图,并分析了温度、物距和辐射系数等参数对系统杂光水平的影响。对如何合理高效地降低系统自身热辐射噪声具有指导意义。
在紅外探測繫統中,噹目標信號比較弱時,少量的雜散光引起的譟聲就會大大降低繫統的輸齣信譟比,從而降低繫統的探測能力。對于高靈敏紅外成像探測繫統和低冷輻射環境模擬繫統,繫統自身熱輻射將成為雜光的最大來源。文中分析說明瞭繫統自身熱輻射雜光的確定性和近場性,提齣瞭一種新的基于光線光學的計算模型,討論瞭計算模型中的一些關鍵問題和解決方法,併編程實現瞭對近場物體雜散輻射的精確數值模擬與倣真。得到瞭雜光在探測器上的輻照度分佈圖,併分析瞭溫度、物距和輻射繫數等參數對繫統雜光水平的影響。對如何閤理高效地降低繫統自身熱輻射譟聲具有指導意義。
재홍외탐측계통중,당목표신호비교약시,소량적잡산광인기적조성취회대대강저계통적수출신조비,종이강저계통적탐측능력。대우고령민홍외성상탐측계통화저랭복사배경모의계통,계통자신열복사장성위잡광적최대래원。문중분석설명료계통자신열복사잡광적학정성화근장성,제출료일충신적기우광선광학적계산모형,토론료계산모형중적일사관건문제화해결방법,병편정실현료대근장물체잡산복사적정학수치모의여방진。득도료잡광재탐측기상적복조도분포도,병분석료온도、물거화복사계수등삼수대계통잡광수평적영향。대여하합리고효지강저계통자신열복사조성구유지도의의。
In infrared detection systems, when the target signal is relatively weak, the noise caused by a spot of stray light will greatly reduce the SNR of system, thus reduce the system's detection capability. For highly sensitive infrared imaging system and low temperature environment simulation system, the thermal radiation emitted from the optical surfaces is the largest source of stray light. In this paper, the certainty and near-field property of self-emitted thermal radiation stray light were analyzed, and a new computational model based on ray optics was proposed. Some key problems in the calculation model were discussed, the solutions were proposed. Moreover, the near-field thermal radiation of objects was accurately numerical simulated. Distribution of irradiance on the detector was gained, the effects of temperature, distance, radiation coefficient and other parameters on the stray light level were analyzed, which has a guiding significance on reducing the system′s thermal radiation noise reasonably and efficiently.