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Proceedings Paper

LED uniform illumination system for DMD-based confocal microscopy
Author(s): Kaimin Xiao; Wenmei Hou; Qixin Xu; Bofang Peng
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Paper Abstract

Due to the coherence of laser light source it could produce coherent noise in parallel confocal microscopy based on Digital Micromirror Device (DMD) and thus affect the resolution. LED light source instead of the laser light source can give full play because of its incoherence characterization. In this paper, free-form surface lens is used for LED secondary optics design. According to the LED characteristics and the law of refraction, we have established differential equations of free-form surface. We solved equations with the method of Runge-Kutta by Matlab and the model was built in Tracepro for optical simulation. The results show that the uniformity on the DMD is better than 90% and the lighting efficiency is higher than before. The measured data show us a much more uniform illumination on DMD and LED uniform illumination system successfully avoided the gray error which was caused by the uneven illumination. The LED driver circuit using DC power supply provides us a more stable light source. The axial optical tomography is more accurate and the reconstruction of three-dimensional image is more clearer.

Paper Details

Date Published: 10 October 2013
PDF: 10 pages
Proc. SPIE 8916, Sixth International Symposium on Precision Mechanical Measurements, 89163T (10 October 2013); doi: 10.1117/12.2035730
Show Author Affiliations
Kaimin Xiao, Univ. of Shanghai for Science and Technology (China)
Wenmei Hou, Univ. of Shanghai for Science and Technology (China)
Qixin Xu, Univ. of Shanghai for Science and Technology (China)
Bofang Peng, Univ. of Shanghai for Science and Technology (China)


Published in SPIE Proceedings Vol. 8916:
Sixth International Symposium on Precision Mechanical Measurements
Shenghua Ye; Yetai Fei, Editor(s)

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