Approach to analysis and measurement of large-array Bragg grating sensors

Talabuttala Srinivas; Indu Shekhar Das; Ananth Selvarajan

doi:10.1117/12.369344

11 November 1999 Approach to analysis and measurement of large-array Bragg grating sensors

Talabuttala Srinivas, Indu Shekhar Das, Ananth Selvarajan

Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999) https://doi.org/10.1117/12.369344
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

Abstract

Arrays of fiber bragg gratings can be embedded in engineering structures to study the effect of various deformations and perturbations and thus enabling 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, like an array of non-uniform grating and wavelength based addressing or an array of uniform grating with time- delay based 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.

Citation Download Citation

Talabuttala Srinivas, Indu Shekhar Das, and Ananth Selvarajan "Approach to analysis and measurement of large-array Bragg grating sensors", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); https://doi.org/10.1117/12.369344

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KEYWORDS

Reflectivity

Fiber Bragg gratings

Sensors

Distortion

Smart structures

Communication engineering

Multiplexing

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