Spatial Frequency Modulated Imaging (SPIFI) with amplitude or phase grating from a spatial light modulator

2017 ◽  
Author(s):  
Michael D. Young ◽  
Emerson C. Barbano ◽  
Nathan Worts ◽  
Jeffrey J. Field ◽  
Christopher Hoy ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Phase Grating ◽  
Modulated Imaging

Phase Grating Wavefront Curvature Sensor based on Liquid Crystal Spatial Light Modulator

2015 ◽  
Vol 52 (8) ◽  
pp. 082301
Author(s):  
陈波 Chen Bo ◽  
杨靖 Yang Jing ◽  
李新阳 Li Xinyang ◽  
李小阳 Li Xiaoyang ◽  
杨旭 Yang Xu
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Phase Grating ◽  
Curvature Sensor

An Issue and its Processing in PIS Testing

2007 ◽  
Vol 364-366 ◽  
pp. 1242-1245
Author(s):  
Jin Xu ◽  
Yan Li ◽  
Zhe Bo Chen ◽  
Xu Xiang Ni ◽  
Zu Kang Lu
Keyword(s):  
Image Quality ◽  
Spatial Frequency ◽  
Spatial Light Modulator ◽  
Fourier Spectrum ◽  
Imaging System ◽  
Notch Filter ◽  
Spatial Filtering ◽  
Multiple Point ◽  
Light Modulator ◽  
Programmable Imaging

In PIS (Programmable Imaging System) testing, where the spatial frequency of the spatial light modulator is inconsistent with that of the image device, Morie Fringes are generated. To further develop the PIS instrument, it has to abate the effects of Morie Fringes on the image quality. In this paper, we implemented an approach using spatial filtering in the Fourier Spectrum. Since “ringing” phenomenon is caused by the “notch filter”, to prevent it, a multiple-point Gauss Filter based on the “notch filter” has been designed. The tests have indicated that this approach can efficiently reduce the effects of the issue on the image quality, and the images reconstructed are clear and almost free from “ringing”,thus reaching the requirements for the instrument.

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