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Proceedings Paper

FBG-based novel sensor for high-temperature measurement and its low-cost interrogation
Author(s): Venkata Reddy M.; Srimannarayana K.; R. L. N. Sai Prasad; T. V. Apparao; Vengal Rao P.
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Paper Abstract

A novel sensor for high-temperature measurement using Fiber Bragg grating (FBG) along with its low-cost interrogation system has been designed and tested. The sensor works based on measurement of the shift in Bragg wavelength that corresponds to the temperature induced strain by making use of a mechanical transducer. The transducing element provides temperature dependent strain on FBG by means of differential linear thermal expansion of two different materials, stainless steel and mild steel. The shift in Bragg wavelength of FBG due to this temperature induced strain is measured by using optical spectrum analyser (OSA). Further the bulk and expensive OSA is replaced by a low cost interrogation system that employed an LPG, a photodiode, a transimpedance amplifier, and a digital multimeter. The LPG converts wavelength information of FBG into its equivalent intensity modulated signal which is captured by a simple photodiode and then converted into voltage signal using the transimpedance amplifier. The designed sensor measures the temperature from 20°C to 1000°C with a resolution of 2°C.

Paper Details

Date Published: 5 May 2015
PDF: 6 pages
Proc. SPIE 9506, Optical Sensors 2015, 95060C (5 May 2015); doi: 10.1117/12.2181966
Show Author Affiliations
Venkata Reddy M., National Institute of Technology (India)
Srimannarayana K., National Institute of Technology (India)
R. L. N. Sai Prasad, National Institute of Technology (India)
T. V. Apparao, National Institute of Technology (India)
Vengal Rao P., National Institute of Technology (India)

Published in SPIE Proceedings Vol. 9506:
Optical Sensors 2015
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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