Radiometric calibration and SNR calculation of a SWIR imaging telescope
- Tubitak Uzay (Space Technologies Research Institute) ODTU Campus 06531 Ankara (Turkey)
Radiometric calibration of an imaging telescope is usually made using a uniform illumination sphere in a laboratory. In this study, we used the open-sky images taken during bright day conditions to calibrate our telescope. We found a dark signal offset value and a linear response coefficient value for each pixel by using three different algorithms. Then we applied these coefficients to the taken images, and considerably lowered the image non-uniformity. Calibration can be repeated during the operation of telescope with an object that has better uniformity than open-sky. Also SNR (Signal to Noise Ratio) of each pixel was calculated from the open-sky images using the temporal mean and standard deviations. It is found that SNR is greater than 80 for all pixels even at low light levels.
- OSTI ID:
- 22069207
- Journal Information:
- AIP Conference Proceedings, Vol. 1476, Issue 1; Conference: 2. international advances in applied physics and materials science congress, Antalya (Turkey), 26-29 Apr 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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