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测量红外低温相机的系统调制传递函数(MTF)需要借助于低温平行光管。由于红外低温相机探测器在常温下无法正常工作,并且红外低温相机、低温平行光管离轴抛物镜以及模拟靶标三者是空间分离的,因此实验前需要将相机的视轴引出到平行光管的视轴方向,同时将模拟靶标调整到平行光管焦面位置且靶标中心处于平行光管的中心视场。借助于干涉仪,利用经纬仪分别将相机视轴和平行光管视轴引出到外基准立方镜a和b,通过两立方镜坐标系的方向余弦矩阵关系,将红外低温相机的视轴引出到低温平行光管的视轴方向。对视轴引出精度进行了分析,给出了实验采集的图像。实验结果表明,系统MTF满足要求,同时表明红外低温相机视轴引出方法合理可行。
Measuring the system modulation transfer function (MTF) of infrared low temperature cameras requires the aid of a colder collimator. Because the infrared low-temperature camera detector does not work normally at room temperature and the infrared low-temperature camera, the collimator off-axis parabolic mirror and the simulated target are separated from each other, it is necessary to lead the camera’s visual axis to the collimator While the simulated target is adjusted to the focal plane position of the collimator and the center of the target is in the central field of view of the collimator. With the aid of interferometer, the optic axis of the camera and the parallel light pipe are respectively led out to the external reference cubes a and b by the theodolite, and the visual axis of the infrared low temperature camera is led out to a low temperature through the direction cosine matrix of the two cube coordinate systems The direction of the optic axis of a parallel light pipe. The accuracy of boresight extraction was analyzed and the images collected experimentally were given. The experimental results show that the MTF of the system meets the requirements, meanwhile the method of visual axis extraction of infrared low temperature camera is reasonable and feasible.