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Proceedings Paper

Low-cost and high-resolution interrogation scheme for LPG-based temperature sensor
Author(s): Venkata Reddy M.; Srimannarayana K.; Venkatappa Rao T.; Vengal Rao P.
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Paper Abstract

A low-cost and high-resolution interrogation scheme for a long-period fiber grating (LPG) temperature sensor with adjustable temperature range has been designed, developed and tested. In general LPGs are widely used as optical sensors and can be used as optical edge filters to interrogate the wavelength encoded signal from sensors such as fiber Bragg grating (FBG) by converting it into intensity modulated signal. But the interrogation of LPG sensors using FBG is a bit novel and it is to be studied experimentally. The sensor works based on measurement of shift in attenuation band of LPG corresponding to the applied temperature. The wavelength shift of LPG attenuation band is monitored using an optical spectrum analyser (OSA). Further the bulk and expensive OSA is replaced with a low-cost interrogation system that employ an FBG, photodiode and a transimpedance amplifier (TIA). The designed interrogation scheme makes the system low-cost, fast in response, and also enhances its resolution up to 0.1°C. The measurable temperature range using the proposed scheme is limited to 120 °C. However this range can be shifted within 15-450 °C by means of adjusting the Bragg wavelength of FBG.

Paper Details

Date Published: 23 September 2015
PDF: 6 pages
Proc. SPIE 9577, Optical Modeling and Performance Predictions VII, 95770L (23 September 2015); doi: 10.1117/12.2188184
Show Author Affiliations
Venkata Reddy M., National Institute of Technology, Warangal (India)
Srimannarayana K., National Institute of Technology, Warangal (India)
Venkatappa Rao T., National Institute of Technology, Warangal (India)
Vengal Rao P., National Institute of Technology, Warangal (India)


Published in SPIE Proceedings Vol. 9577:
Optical Modeling and Performance Predictions VII
Mark A. Kahan; Marie B. Levine-West, Editor(s)

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