Abstract
The performance of the multispectral infrared camera is seriously influenced by the stray radiation. In order to ensure that the camera can work properly in all situations, the stray radiation in different working conditions needs to be analyzed. The main sources of the stray radiation in the infrared optical system of a camera were analyzed. The model of the multispectral infrared camera was established in the stray light analysis software. The irradiance of the imaging plane was used to evaluate the stray radiation level. Taking the influence of the solar azimuth and the off-axis angle into consideration, around the hood, 8 solar azimuths and 16 different off-axis angles were selected to carry out the ray tracing. Thus the irradiance of the imaging plane for every certain condition was obtained. And the effect to the irradiance of the imaging plane caused by the rotation of the pointing mirror which was composed of roller shaft and pitching axis was analyzed. Meanwhile the influence of the earth atmosphere stray radiation was also discussed. The results show that the earth atmosphere stray radiation is tolerable. And the system can basically satisfy the requirement to the imaging plane irradiance when the off-axis angle is greater than 58°. The infrared optical system of the multispectral camera can work well within this range.
| Original language | English |
|---|---|
| Pages (from-to) | 3201-3206 |
| Number of pages | 6 |
| Journal | Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering |
| Volume | 42 |
| Issue number | 12 |
| Publication status | Published - Dec 2013 |
Keywords
- Infrared optical system
- Irradiance
- Multispectral camera
- Stray radiation