Enhanced self-mixing Doppler velocimetry by fiber Bragg grating

Hao Lin; Junbao Chen; Wei Xia; Hui Hao; Dongmei Guo; Ming Wang

doi:10.1117/1.OE.57.5.051504

8 February 2018 Enhanced self-mixing Doppler velocimetry by fiber Bragg grating

Hao Lin, Junbao Chen, Wei Xia, Hui Hao, Dongmei Guo, Ming Wang

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 051504 (February 2018). https://doi.org/10.1117/1.OE.57.5.051504

Abstract

An enhanced laser self-mixing Doppler velocimeter by fiber Bragg grating (FBG) is proposed. In fiber sensing, FBG is often used as an optical filter to select the wavelength of the light using the narrow reflection spectrum. The Doppler frequency shift from the rotating target can be parsed in the self-mixing interferometry (SMI) signal. The frequency-fluctuant self-mixing signal is transformed into intensity variations by a FBG when the laser wavelength is set to the edge of the FBG steep transmission profile. An experimental comparison between the enhanced and the traditional SMI approaches is made. The magnitude of obtained FBG-enhanced SMI signal is about 40 times stronger than that from traditional SMI. The result of the experiments indicates that enhanced self-mixing Doppler velocimetry by FBG can be applied to velocity sensing. This method has potential application in the engineering industry because the FBG is easy to fabricate and connect to a SMI system and the wavelength of FBG can be changed to match the different lasers for an enhanced SMI signal.

Citation Download Citation

Hao Lin, Junbao Chen, Wei Xia, Hui Hao, Dongmei Guo, and Ming Wang "Enhanced self-mixing Doppler velocimetry by fiber Bragg grating," Optical Engineering 57(5), 051504 (8 February 2018). https://doi.org/10.1117/1.OE.57.5.051504

Received: 14 November 2017; Accepted: 10 January 2018; Published: 8 February 2018

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