19 February 2009 Modulation transfer function of partial gating detector by liquid crystal auto-controlling light intensity
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Abstract
Based on the electro-optical properties of liquid crystal, we have designed a novel partial gating detector. Liquid crystal can be taken to change its own transmission according to the light intensity outside. Every single pixel of the image is real-time modulated by liquid crystal, thus the strong light is weakened and low light goes through the detector normally .The purpose of partial-gating strong light (>105lx) can be achieved by this detector. The modulation transfer function (MTF) equations of the main optical sub-systems are calculated in this paper, they are liquid crystal panels, linear fiber panel and CCD array detector. According to the relevant size, the MTF value of this system is fitted out. The result is MTF= 0.518 at Nyquist frequency.
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Xusan Yang, Yuanhe Tang, Kai Liu, Hanchen Liu, Haiyang Gao, Qing Li, Ruixia Zhang, Na Ye, Yuan Liang, Gaoxiang Zhao, "Modulation transfer function of partial gating detector by liquid crystal auto-controlling light intensity", Proc. SPIE 7279, Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration, 72790Z (19 February 2009); doi: 10.1117/12.821611; https://doi.org/10.1117/12.821611
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