CAJ | 학술논문

在高灵敏度的红外光学系统中,来自系统内部的热辐射是影响系统探测性能的重要素之一.污染颗粒物通常是杂散辐射的主要来,除了光学元件的表面污染,探测器内部也会存在污染颗粒物.文中主要研究探测器内部颗粒物对焦平面光场分布产生的影响.根据红外辐射及散射理建立了相应的理论模型,对探测器内部不同温度、不同位置的颗粒物在焦平面上形成的光场分布进行了仿真计算和对比分析,并进行了实验验证.结果表明,探测器内部如有颗粒杂质,在一定的使用环境下,可在探测器焦面上产生黑斑、白斑、黑点白斑等异常现象,而这些异常光场分布会对场景中的红外目标物产生干扰,造成误判,从而影响对目标的准确识别.此应采用措施以保证探测器内部的洁净度,防止颗粒物的产生.
재고령민도적홍외광학계통중,래자계통내부적열복사시영향계통탐측성능적중요소지일.오염과립물통상시잡산복사적주요래,제료광학원건적표면오염,탐측기내부야회존재오염과립물.문중주요연구탐측기내부과립물대초평면광장분포산생적영향.근거홍외복사급산사리건립료상응적이론모형,대탐측기내부불동온도、불동위치적과립물재초평면상형성적광장분포진행료방진계산화대비분석,병진행료실험험증.결과표명,탐측기내부여유과립잡질,재일정적사용배경하,가재탐측기초면상산생흑반、백반、흑점백반등이상현상,이저사이상광장분포회대장경중적홍외목표물산생간우,조성오판,종이영향대목표적준학식별.차응채용조시이보증탐측기내부적길정도,방지과립물적산생.
In the high sensitive infrared optical systems, the self-generated thermal radiation is one of the important factors for the detective property. Particulate contaminants are usually the main source of stray radiation. Besides the surface contaminants, there may be particulates within the detector. The influence on the luminous flux distribution on the image plane of the particulates inside the detector was studied in this paper. According to image plane's luminous flux distribution of the particulates inside detector with different temperature from different distance to image plane, relevant theoretical model was built up based on theory of infrared radiation and scattering, which was validated by the corresponding experiments. The results indicate that if there are particulates inside the detector used at the condition of vibration environment, they will form exception image such as black spot and white spot and combination with each other on the image plane. These abnormal distributions of luminous flux disturb the infrared targets in the effective field of view, resulting in false judgments. Thus, the veracity of the identification for infrared targets degraded obviously. Therefore it is of critical importance to keep the inside of the detector clean and prevent the generation of the particulates.