Velocity measurement by speckle modulating an Erbium-doped fiber ring laser

Daofu Han; Shijia Chen; Dongmei Guo

doi:10.1117/12.865469

16 October 2010 Velocity measurement by speckle modulating an Erbium-doped fiber ring laser

Daofu Han, Shijia Chen, Dongmei Guo

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 76565Q (2010) https://doi.org/10.1117/12.865469
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

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.

Citation Download Citation

Daofu Han, Shijia Chen, and Dongmei Guo "Velocity measurement by speckle modulating an Erbium-doped fiber ring laser", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76565Q (16 October 2010); https://doi.org/10.1117/12.865469

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KEYWORDS

Speckle

Velocity measurements

Fiber lasers

Modulation

Signal detection

Light scattering

Laser resonators

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