26 August 2010 Simultaneous measurement of strain and temperature with a pair of matched fiber Bragg gratings
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Proceedings Volume 7813, Remote Sensing System Engineering III; 78130Q (2010); doi: 10.1117/12.871964
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States
Abstract
A novel approach for simultaneous measurement of static/dynamic strain and temperature with a pair of matched fiber Bragg grating(FBG)s is proposed. When a diode laser locked to the mid reflection frequency of reference FBG is used to illuminate the sensor FBG, reflected intensity changes with strain on sensor FBG. Reference FBG responds with temperature on sensor FBG and is immune to strain, hence, wavelength of the diode laser acts as a signature for temperature measurement. Theoretical sensitivity limit for static strain and temperature are 1.2 nε √Hz and 0.0011 °C respectively. Proposed sensor shows a great potential in high sensitive strain measurements with a simplified experimental setup.
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Mahesh Kondiparthi, Shivananju B.N, "Simultaneous measurement of strain and temperature with a pair of matched fiber Bragg gratings", Proc. SPIE 7813, Remote Sensing System Engineering III, 78130Q (26 August 2010); doi: 10.1117/12.871964; https://doi.org/10.1117/12.871964
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KEYWORDS
Fiber Bragg gratings

Sensors

Semiconductor lasers

Temperature metrology

Reflectivity

Environmental sensing

Signal to noise ratio

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