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Proceedings Paper

Velocity measurement by speckle modulating an Erbium-doped fiber ring laser
Author(s): Daofu Han; Shijia Chen; Dongmei Guo
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Paper Abstract

In this paper, Speckle modulating an erbium-doped fiber ring (EDFR) laser is used to detect the velocity of dynamic diffused object. All-fiber structure of the speckle measurement system is set up. The autocorrelation function of speckle signal related with the velocity variable of a moving object under test is theoretically derived. By experiments, the speckle signals are acquired by a photodiode, and using the autocorrelation function, we calculated the correlation coefficient of the speckle signals. When the coefficient is equal to 1/e, the velocity of the object is determined. In order to explore the influence that the signal length affects on measurement accuracy, a group of signals with different length of time is applied to calculate the velocity, and the result indicates that when signal length is greater than the correlation length, the measurement error is very small.

Paper Details

Date Published: 16 October 2010
PDF: 7 pages
Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76565Q (16 October 2010); doi: 10.1117/12.865469
Show Author Affiliations
Daofu Han, Nanchang Univ. (China)
Shijia Chen, Nanchang Univ. (China)
Dongmei Guo, Nanjing Normal Univ. (China)


Published in SPIE Proceedings Vol. 7656:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Jose M. Sasian; Libin Xiang; Sandy To, Editor(s)

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