红外搜索装置(图1)是机械扫描的系统,它用瞬时视场ω在桢时为t_f的时间内扫描总视场Ω。一般说来,其目的是在低温背景杂乱辐射——天空和云的热梯度或地面辐射——中探测热目标的位置,例如喷气飞机尾喷管。所测目标的位置在阴极射线管或光源矩阵等可见屏幕上显示。因此,搜索系统工作起来和红外扫描成象系统是极为相似的。其主要差别是光谱响应范围。此时,人们特别注意的目标不是背景的结构,而是噪声。因此,使用适当的光谱、空间和时间滤波技术,尽量增强点目标和背景的对比度,再用灵敏阈技术将剩余的杂乱辐射信号抑制掉。操作人员一般调节控制旋钮,将灵敏阈调到占主 The infrared search device (Fig. 1) is a mechanical scanning system that scans the total field of view Ω with the instantaneous field of view ω at time t_f. In general, its purpose is to detect the location of hot targets in the clutter of low-temperature background - thermal gradients in the sky and clouds or in the terrestrial radiation - such as the jet nozzle. The position of the measured target is displayed on a visible screen such as a cathode ray tube or a light source matrix. Therefore, the search system works very much like an infrared scanning imaging system. The main difference is the spectral response range. At this point, people pay special attention to the goal is not the background of the structure, but the noise. Therefore, using the appropriate spectral, spatial, and temporal filtering techniques, the contrast between the point target and the background is maximized, and the remaining spurious radiation signals are suppressed using the sensitivity threshold technique. Operators generally adjust the control knob, the sensitive threshold transferred to the owner