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Sensors 2018, 18(1), 201; doi:10.3390/s18010201

Optical Fiber Demodulation System with High Performance for Assessing Fretting Damage of Steam Generator Tubes

1
The Key Laboratory of Optoelectronic Technology & System (Ministry of Education), Chongqing University, Chongqing 400044, China
2
Nuclear Power Institute of China, Chengdu 610041, China
*
Author to whom correspondence should be addressed.
Received: 12 November 2017 / Revised: 5 January 2018 / Accepted: 9 January 2018 / Published: 12 January 2018
(This article belongs to the Special Issue Optical Fiber Sensors 2017)
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Abstract

In order to access the fretting damage of the steam generator tube (SGT), a fast fiber Fabry-Perot (F-P) non-scanning correlation demodulation system based on a super luminescent light emitting diode (SLED) was performed. By demodulating the light signal coming out from the F-P force sensor, the radial collision force between the SGT and the tube support plate (TSP) was interrogated. For higher demodulation accuracy, the effects of the center wavelength, bandwidth, and spectrum noise of SLED were discussed in detail. Specially, a piezoelectric ceramic transducer (PZT) modulation method was developed to get rid of the interference of mode coupling induced by different types of fiber optics in the demodulation system. The reflectivity of optical wedge and F-P sensor was optimized. Finally, the demodulation system worked well in a 1:1 steam generator test loop and successfully demodulated a force signal of 32 N with a collision time of 2 ms. View Full-Text
Keywords: optical fiber; fiber Fabry-Perot sensor; steam generator tube; F-P signal demodulation optical fiber; fiber Fabry-Perot sensor; steam generator tube; F-P signal demodulation
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Huang, P.; Wang, N.; Li, J.; Zhu, Y.; Zhang, J.; Xi, Z. Optical Fiber Demodulation System with High Performance for Assessing Fretting Damage of Steam Generator Tubes. Sensors 2018, 18, 201.

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