Simultaneous measurement of vibration and temperature with fiber Bragg grating

Nobuaki Takahashi; Hiroki Yokosuka; Satoshi Tanaka

doi:10.1117/12.621508

12 April 2005 Simultaneous measurement of vibration and temperature with fiber Bragg grating

Nobuaki Takahashi, Hiroki Yokosuka, Satoshi Tanaka

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621508
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

Abstract

Simultaneous measurement of mechanical vibration and temperature are performed using a fiber Bragg grating (FBG) as a sensing element. The principle of the FBG vibration sensing is based on the fact that when an FBG is under influence of vibration, it modulates the intensity of the reflected and transmitted light if the bandwidth of the incident light is narrow and its wavelength is tuned to the slope of the FBG transmittance curve. DC component of the photocurrent produced in a photodiode by the sensor output light corresponds to the operation point of the sensor. By feeding back a part of the sensor output to the laser light source to shift the oscillation wavelength of the laser, the DC component is kept constant and the sensitivity of the vibration sensor is stabilized when the temperature varies in the environment. Its fluctuation is measured to be as small as 1 dB, though it is more than 58 dB without the stabilization. Since the oscillation wavelength has one-to-one correspondence to the environmental temperature, monitoring the laser temperature control voltage enables us to determine the temperature around the FBG sensing element.

Citation Download Citation

Nobuaki Takahashi, Hiroki Yokosuka, and Satoshi Tanaka "Simultaneous measurement of vibration and temperature with fiber Bragg grating", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621508

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