DISTRIBUTED TEMPERATURE MEASUREMENTS ALONG A HEATED TUBE USING ALL-FIBER BRAGG GRATING OPTICAL SENSORS


37th Annual CNS Conference - 2017 June 04-07

Presented at:
37th Annual CNS Conference
2017 June 04-07
Location:
Niagara Falls
Session Title:
3A4 - I & C

Authors:
R.C. Bowden (Canadian Nuclear Laboratories)
W. Li (Canadian Nuclear Laboratories)
M. Gaudet (Canadian Nuclear Laboratories)
M. Benson (Canadian Nuclear Laboratories)
A. Siddiqui (Canadian Nuclear Laboratories)
  

Abstract

This study presents the application of Optical Frequency Domain Reflectometry (OFDR) technique for distributed fiber optic temperature measurements along a heated tube. The sensor consisted of a 0.5 m long commercially available all-Fiber Bragg Grating (FBG) fiber with 9 mm grating length, 10 mm pitch spacing, and a central wavelength of 1550 nm. The all-FBG sensors were installed along the outside surface of a heated Inconel tube with an outside diameter of 13 mm and a length of 500 mm, and used to measure surface temperatures during free-convection tests at atmospheric pressure in both air and water. The OFDR technique measures the reflected spectral shifts from all-FBG sensors, which are then converted to temperatures through calibration using thermocouples. Temperature distributions recorded along the heated tube up to 160 °C in air, and up to 76 °C in water, are reported to demonstrate sensor performance. Preliminary results show that all-FBG sensor accuracy is within ±5% of thermocouple measurements at steady-state conditions.

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