Design of DoLP Detecting System for Static Target Based on Dual Channel AOTF-NIR
Dual channel wide spectrum AOTF-NIR device is widely used in remote sensing polarization imaging system.In this system,dual channel AOTF-NIR and four channel infrared CCD camera are combined to obtain the static target spectral image.The host com-puter controls the incidence angle of AOTF-NIR and the dual channel RF driving frequency to achieve DoLP spectral imaging of 900～1 700 nm.At the same time,a new broadband matching method of the dual channel AOTF-NIR is analyzed from the perspective of crystal impedance matching,and a band-pass matching network with 73% peak diffraction efficiency and high spectral imaging clarity is pro-posed.The experiments of 0°,45°,90°,135° diffraction light intensity and DoLP imaging at 1 120 nm show that the system can effec-tively obtain the structural characteristics of static objects that cannot be obtained in intensity imaging system,which can provide a refer-ence for near-infrared remote sensing imaging and recognition technology.
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