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Approach to analysis and measurement of large array Bragg grating sensors

Talabuttala, Srinivas and Das, Indu S and Selvarajan, Ananth (1999) Approach to analysis and measurement of large array Bragg grating sensors. In: Advanced Photonic Sensors and Applications, 30 Nov.-3 Dec. 1999, Singapore, pp. 480-487.

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Arrays of fiber Bragg gratings can be embedded in engineering structures to study the effect of various deformations and perturbations and thus enable its health monitoring. In this paper, two multiplexing and detection schemes useful in the case of high resolution Bragg gratings, are presented. Instead of the conventional detection schemes, such as an array of nonuniform gratings and wavelength based addressing or an array of uniform gratings with time-delay based addressing, we suggest a nonuniform cluster of uniform gratings. A continuous wave or pulse train can be input to address and distinguish the gratings from each other. The first technique uses continuous wave input and measures the reflected amplitude response, while in the second technique we input pulsed light and measure the height as well as width of the reflected pulse. In both the cases, a minimum response time is suggested for the measurement to be made. This is the time when responses from the last grating is also obtained and a high degree of saturation leading to stable condition is obtained. We have combined the results for a single grating using the coupled mode theory with an equivalent matrix operator for the array to obtain an effective and simple mathematical tool to handle the large array problem

Item Type: Conference Paper
Publisher: SPIE - The International Society for Optical Engineering
Additional Information: Copyright of this article belongs to SPIE - The International Society for Optical Engineering
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 25 Jul 2007
Last Modified: 27 Aug 2008 12:43
URI: http://eprints.iisc.ac.in/id/eprint/10298

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