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17 May 2011 Etched core fiber Bragg grating sensor integrated with microfluidic channel
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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77530G (2011)
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada
We demonstrate an etched-core fiber Bragg grating sensor for detection of bio-chemical agents. The fiber Bragg grating of the sensor is etched to a diameter of 7 μm. The transition between the etched and the unetched core consists of an asymmetric taper resulting in excitation of multiple modes. The different excited modes respond differently to change in refractive index, temperature and strain. This allows for measurements for changes in these three parameters in a single measurement by simultaneous measurement of reflections in Bragg wavelengths for different modes. This parametric discrimination is confirmed experimentally by measuring the refractive index of water as temperature is increased. The sensor is then integrated in a micro-fluidic channel fabricated using Polydimethylsiloxane (PDMS) substrate and tested by introducing different chemicals. The sensitivity of the sensor to refractive index change is 92 nm/riu close to the refractive index of water. Assuming a wavelength resolution of 1 pm, index resolution of 1x10-5, a strain resolution of 1 microstrain, and a temperature resolution of 0.032 ºC is achieved by the sensor.
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Sang-Mae Lee, Myung-Yung Jeong, and Simarjeet Singh Saini "Etched core fiber Bragg grating sensor integrated with microfluidic channel", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77530G (17 May 2011);


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