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Proceedings Paper

Coprime frequency modulation on light field for correlation imaging
Author(s): Zhentao Duan; Huizu Lin; Weitao Liu; Shaobo Gao; Quan Li
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Paper Abstract

Correlation imaging experiments correlate the outputs from two photodetectors. The image can be obtained by calculating the correlation function between results of two detectors. To reconstruct image of the object, many frames of different speckles are required. Therefore, the speed of correlation imaging is strongly limited by the speed of modulation of the light field. Usually, we use Spatial Light Modulator (SLM) to load different random phase at different positions of a plane-wave light field. The refresh rate of the speckle fields is thus limited by the surface refresh rate of SLM. However, the response speed of each pixel when we control it independently is far greater than the refresh rate of the whole surface. Based on this fact, we propose to modulate each pixel independently with different sinusoidal signals, in order to improve the refresh rate of speckle field. To generate randomly fluctuations, the frequencies of different modulation signals are selected to be coprime. At the same time, we can know in advance the intensity distribution of the speckle field in every frame, since we know the phase of each pixel when every pulse light modulated by the SLM.

Paper Details

Date Published: 1 November 2016
PDF: 4 pages
Proc. SPIE 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control, 101572Q (1 November 2016); doi: 10.1117/12.2247036
Show Author Affiliations
Zhentao Duan, National Univ. of Defense Technology (China)
Science and Technology on Aerospace Intelligent Control Lab. (China)
Huizu Lin, National Univ. of Defense Technology (China)
Science and Technology on Aerospace Intelligent Control Lab. (China)
Weitao Liu, National Univ. of Defense Technology (China)
Shaobo Gao, National Univ. of Defense Technology (China)
Quan Li, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 10157:
Infrared Technology and Applications, and Robot Sensing and Advanced Control

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