The mechanical structure of space remote sensor with large pupil would be distorted on ground because of the gravity. The distortion would directly affect the sensor performance. According to this demand, a high precision measurement of distortion is presented in this article. It is based on the theory of interference. Tow mirrors are placed on the positions according to the measurement requirement. One is the reference mirror and the other is to measure the movement. They are all spherical mirrors, and are aligned with a common center. A spherical wave is centered with them an reflected by the mirrors, when the distortion occurs, position of the two mirrors is changed, so does the fringe of the interference. The mathematical equation between distortion and fringe changing is presented. The precision can be less than 1μm.
The cameras whose resolution ratio are limited by the image sensor can be resampled to achieve
super-resolution by phase shifting sampling technique. We make a few small movements between the sensor and
the image, get a set of data with different sampling phase. According to the linear relationship between the sensor
response and the light illumination, super-resolution sampled data can be achieved. Experimental data show that
the super-resolution sampled data is identical with the original data, the relative accuracy can be less than 0.0001.
Based on the theory of radiation energy transfer in the infrared optical system, two methods for stray radiation analysis caused by interior thermal radiation in infrared optical system are proposed, one of which is important sampling method technique using forward ray trace, another of which is integral computation method using reverse ray trace. The two methods are discussed in detail. A concrete infrared optical system is provided. Light-tools is used to simulate the passage of radiation from the mirrors and mounts. Absolute values of internal irradiance on the detector are received. The results shows that the main part of the energy on the detector is due to the critical objects which were consistent with critical objects obtained by reverse ray trace, where mirror self-emission contribution is about 87.5% of the total energy. Corresponding to the results, the irradiance on the detector calculated by the two methods are in good agreement. So the validity and rationality of the two methods are proved.
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