Theoretical Considerations of Fiber Optic Sensors for Thermal Sensing Under Low and High Temperatures Effects

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Vol. 144, No. 9, September 2012, pp. 27-44

Theoretical Considerations of Fiber Optic Sensors for Thermal Sensing Under Low and High Temperatures Effects

Ahmed Nabih Zaki Rashed

Electronics and Electrical Communications Engineering Department

Faculty of Electronic Engineering, Menouf 32951, Menoufia University, Egypt

E-mail: ahmed_733@yahoo.com

Received: 19 June 2012 /Accepted: 21 September 2012 /Published: 28 September 2012

Abstract: Fiber optic sensors were first developed few decades ago for markets where no other sensing solutions existed, such as applications where high electromagnetic interferences (EMI) could be present. Typical applications were for instance temperature measurements in microwave ovens or in high power transformers, strain measurements in electrical welding jaws, pressure measurements for medical applications. If insensitivity to EMI is probably the most interesting advantage of such sensors, other interesting advantages are now being considered: since optical technologies proved to be reliable and accessible, new applications are emerging where reduced size or geometry of such sensors could be the most interesting features. This paper has presented the important transmission characteristics of thermal sensors over wide range of the affecting parameters. The free spectral range (FSR), sensor accuracy, sensor resistance and capacitance, thermal sensing signal quality, sensor thermal sensitivity and response time are the major interesting design parameters in our current research under low and high temperature effects.

Keywords: Intrinsic sensor, Fiber optic sensors, Thermal sensors, Free spectrum range, Response time and Signal quality

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