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29 November 2011 An improved low temperature sensing using PMMA coated FBG
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Proceedings Volume 8311, Optical Sensors and Biophotonics III; 831103 (2011)
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China
Fiber Bragg Gratings have been shown to have a much improved thermal sensitivity when coated by Polymethyle methacrylate (PMMA) at cryogenic regime has been proposed. The PMMA has large thermal expansion coefficients and acts as driving elements. It is coated on the FBG at room temperature and the FBG is under compression at lower temperatures. This allows a much wider tuning of Bragg grating as fiber can stand at more compression than tension. An overall sensitivity of 0.039nm/K in the 1550nm wavelength regime has been achieved and the Bragg wavelength has been tuned upto 8.97nm in the temperature range 77K to 303K.
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D. Sengupta, M. Sai Shankar, P. Saidi Reddy, R. L. N. Sai Prasad, K. S. Narayana, and P. Kishore "An improved low temperature sensing using PMMA coated FBG", Proc. SPIE 8311, Optical Sensors and Biophotonics III, 831103 (29 November 2011);

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