In-line fiber optic laser Doppler velocimetry

Edmon Chehura; Chen-Chun Ye; Ralph P. Tatam

doi:10.1117/12.449363

26 November 2001 In-line fiber optic laser Doppler velocimetry

Edmon Chehura, Chen-Chun Ye, Ralph P. Tatam

Proceedings Volume 4448, Optical Diagnostics for Fluids, Solids, and Combustion; (2001) https://doi.org/10.1117/12.449363
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

In this paper, an all fibre compatible laser Doppler velocimeter featuring a fibre-optic filter device for frequency discrimination is presented for the first time. The technique is based on the fabrication of a Fabry-Perot filter using in-fibre Bragg gratings for measurement of the in-line velocity component. The choice, design and fabrication of the in-fibre filters are discussed. Problems that affect the stability of the system are addressed. These include the design and implementation of two-independent active feedback control loops for the argon-ion laser wavelength and phase of the fiber-optic filter. An optical fibre-linked probe head, constructed in-house, is used to couple the laser beam at 514.5 nm to and from the measurement volume. Fast photomultiplier tube detectors are used and signal capture and processing is performed on a digital storage oscilloscope (300 MHz) or on a PC. The system is successfully demonstrated by measuring the velocity of a rotating disc (10-cm diameter) over a velocity range of +/- 15 ms^-1 with a resolution of 0.2 ms^-1.

Citation Download Citation

Edmon Chehura, Chen-Chun Ye, and Ralph P. Tatam "In-line fiber optic laser Doppler velocimetry", Proc. SPIE 4448, Optical Diagnostics for Fluids, Solids, and Combustion, (26 November 2001); https://doi.org/10.1117/12.449363

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