Chin. Phys. Lett.  2008, Vol. 25 Issue (10): 3593-3596    DOI:
Original Articles |
Temperature-Insensitive Fibre-Optic Acceleration Sensor Based on Intensity-Referenced Fibre Bragg Gratings
SUN Li-Qun1, DONG Bo2, WANG Yong-Xin2, Evan LALLY2, WANG An-Bo2
1State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 1000842Center for Photonics Technology, Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0111, USA
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SUN Li-Qun, DONG Bo, WANG Yong-Xin et al  2008 Chin. Phys. Lett. 25 3593-3596
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Abstract

A temperature-insensitive acceleration sensor using two fibre Bragg gratings (FBGs), based on reflection spectrum intensity modulation and optical power detection, is proposed and demonstrated. A cantilever beam is used to generate acceleration-induced axial strain along two sensing gratings, which are glued on the two opposite surfaces of the beam. Because the two gratings operate within the linear spectral range of a light source, formed by a thermally-tunable extrinsic Fabry--Perot optical filter, the intensity difference of the two reflections from the gratings is proportional to the acceleration applied. This eliminates the need for sophisticated wavelength interrogation of the gratings, and it also endows the sensor with immunity to temperature variation. Compared with a commercial micromachined accelerometer, the sensor is proven to be capable of accurately detecting acceleration.

Keywords: 07.60.-j      42.79.-e      42.81.Wg     
Received: 18 July 2008      Published: 26 September 2008
PACS:  07.60.-j (Optical instruments and equipment)  
  42.79.-e (Optical elements, devices, and systems)  
  42.81.Wg (Other fiber-optical devices)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2008/V25/I10/03593
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Articles by authors
SUN Li-Qun
DONG Bo
WANG Yong-Xin
Evan LALLY
WANG An-Bo
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