Strain-Insensitive Optical Fiber Mach-Zehnder Interferometric Temperature Sensor
A fiber Mach-Zehnder interferometer (MZI) constructed by concatenating a micro cavity in the fiber core and a taper is proposed and applied for temperature sensing. Femtosecond laser micro-machining technique and fusion splicing technique are utilized to fabricate the micro cavity in a single mode optical fiber core. The fiber taper is fabricated by electric arc-discharge with a conventional fusion splicer. A sensitivity of 68 pm/Â°C is obtained at the temperature range of 200-400Â°C. The interferometer is also characterized by different strain.It exhibits very low strain sensitivity because only low order cladding modes are excited by the micro cavity, which is a desirable merit for temperature sensor to eliminate cross sensitivity to strain.
Y. Yu et al., "Strain-Insensitive Optical Fiber Mach-Zehnder Interferometric Temperature Sensor," SPIE Proceedings, SPIE, Jan 2011.
The definitive version is available at http://dx.doi.org/10.1117/12.921252
2011 International Conference on Optical Instruments and Technology
Mechanical and Aerospace Engineering
Keywords and Phrases
Optical Fibers; Temperature Sensors; Fusion Splicing; Interferometers; Mach-Zehnder Interferometer; Micromachining; Cladding; Femtosecond Phenomena
Article - Conference proceedings
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