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Proceedings Paper

Simultaneous measurement of vibration and temperature with fiber Bragg grating
Author(s): Nobuaki Takahashi; Hiroki Yokosuka; Satoshi Tanaka
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Paper 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.

Paper Details

Date Published: 12 April 2005
PDF: 5 pages
Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); doi: 10.1117/12.621508
Show Author Affiliations
Nobuaki Takahashi, National Defense Academy (Japan)
Hiroki Yokosuka, National Defense Academy (Japan)
Satoshi Tanaka, National Defense Academy (Japan)


Published in SPIE Proceedings Vol. 5852:
Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics
Chenggen Quan; Fook Siong Chau; Anand Asundi; Brian Stephen Wong; Chwee Teck Lim, Editor(s)

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