| 光谱学与光谱分析 |
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| Analysis of the Noise and Signal-to-Noise of AOTF Imaging Spectrometer Based on EMCCD |
| ZHAO Hui-jie, CHENG Xuan*, ZHANG Ying, LI Chong-chong |
| Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrumentation Science & Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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Abstract Imaging spectrometer based on acousto-optic tunable filter (AOTF) is a novel hyperspectral imaging system. In order to rectify the non-uniformity of radiation sensitivity on different waveband, especially the low signal-to-noise (SNR) in low-light conditions, the electron-multiplying CCD (EMCCD) sensor was proposed. The noise of AOTF imaging spectrometer was analyzed in both normal and EM modes of the CCD sensor with derived SNR calculating model which has been experimentally validated. On that basis, a new evaluation method of the dynamic range in EM mode and a novel method of calculating spectral radiance at the entrance aperture were adopted. The experimental result shows that the theoretic SNR models are fit, and better selection of EM mode is effective to improve the SNR and non-uniformity of radiation sensitivity in low light level conditions.
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Received: 2012-05-04
Accepted: 2012-08-20
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Corresponding Authors:
CHENG Xuan
E-mail: chengxuan2002@163.com
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