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Proceedings Paper

A method of enhancing response speed for fringe under high SNR photodiode detection
Author(s): Xuanze Wang; Yuning Zhong; Liangen Yang
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Paper Abstract

For the interference fringes' photodiode detection, its SNR can be improved by two ways to a great extent, one is space arrangement of photodiodes, another is that photodiode operates without external reverse voltage. Despite application of reverse voltage to photodiode is very useful in improving linearity and high frequency, it has the accompanying disadvantage of increasing dark current and noise levels along with the danger of damaging the device by excessive applied reverse voltage. In order to keep the high SNR and high frequency response of photodiode, we analyze the relation between movement frequency and photoelectric conversion of interference fringes when space arrangement of photodiodes are designed as a kind of high SNR detection method proposed in our previous article and photodiode operates in no reverse voltage state. On basis of the analysis, a combinative amplifier of DC (direct current) and AC (alternative current) is present to amplify the photoelectric difference signal. The input and feedback resistance of the amplifier are all replaced by the resistance and capacitance in parallel connection. When this amplifier is compared to the common one, it can greatly broaden the frequency response range of fringe signal and ensure the instrument can work normally at low and high frequency.

Paper Details

Date Published: 19 February 2008
PDF: 10 pages
Proc. SPIE 6625, International Symposium on Photoelectronic Detection and Imaging 2007: Related Technologies and Applications, 66251C (19 February 2008); doi: 10.1117/12.791208
Show Author Affiliations
Xuanze Wang, Key Lab. of Modern Manufacture Quality Engineering (China)
Yuning Zhong, Hubei Univ. of Technology (China)
Liangen Yang, Hubei Univ. of Technology (China)

Published in SPIE Proceedings Vol. 6625:
International Symposium on Photoelectronic Detection and Imaging 2007: Related Technologies and Applications

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