CAJ | 학술논문

在红外探测系统总体方案设计中，为了能够快速而准确地了解众多参数对性能指标的影响，针对其重要参数作用距离进行了研究。首先分析目标与背景的对比辐射强度在像面上产生的电子数，其中考虑了滤光片的光谱透过特性和点扩散函数与像元的相对位置对系统能量集中度的影响；然后基于红外光学系统成像链路物理特性，定量研究红外光电系统的时域噪声和空域噪声在像面上的辐照度。基于图像目标信噪比检测判据给出了综合各种噪声条件下针对红外点目标的作用距离计算方程。最后，以航空平台上一套中波红外凝视探测设备为例来进行作用距离的计算和分析。通过示例验证了作用距离计算方程简单可行，可针对不同条件、地域对红外成像系统作用距离进行预估。作用距离计算方程可以帮助使用者在设计初期阶段确定不同参数对红外探测装置性能的影响。
재홍외탐측계통총체방안설계중，위료능구쾌속이준학지료해음다삼수대성능지표적영향，침대기중요삼수작용거리진행료연구。수선분석목표여배경적대비복사강도재상면상산생적전자수，기중고필료려광편적광보투과특성화점확산함수여상원적상대위치대계통능량집중도적영향；연후기우홍외광학계통성상련로물리특성，정량연구홍외광전계통적시역조성화공역조성재상면상적복조도。기우도상목표신조비검측판거급출료종합각충조성조건하침대홍외점목표적작용거리계산방정。최후，이항공평태상일투중파홍외응시탐측설비위례래진행작용거리적계산화분석。통과시례험증료작용거리계산방정간단가행，가침대불동조건、지역대홍외성상계통작용거리진행예고。작용거리계산방정가이방조사용자재설계초기계단학정불동삼수대홍외탐측장치성능적영향。
In order to quickly and accurately understand the impact on performance requirements by a number of parameters, the operating range, which is an important parameter in IR detection system, was studied in this paper. Firstly, considering the spectral transmittance characteristics of the filter and the encircled energy affected by the relative position between point spread function and the pixel, the number of electrons produced by contrast radiation intensity between target and background in the image plane was presented. Secondly, irradiance produced by both temporal and spatial noise in the image plane based on end-to-end physics performance model of IR imaging system was studied quantitatively. Considering variety of noise conditions, the operating range calculation equation was given based on the target image's signal-to-noise ratio (SNR) detection criterion. Finally, a set of MWIR staring sensor was used as an instance to calculate and analyze the operating range. By this example, it is verified that the distance calculation equation is simple and feasible. Besides, it could predict operating range of IR imaging system for different weather conditions and regions. This performance model will help the user to refine the various parameters of the IR sensor at the early design stage.