Fiber-Optic Multipoint Sensor System with Low Drift for the Long-Term Monitoring of High-Temperature Distributions in Chemical Reactors

被引:28
作者
Dutz, Franz J. [1 ]
Heinrich, Andreas [2 ]
Bank, Rolf [2 ]
Koch, AlexanderW. [3 ]
Roths, Johannes [1 ]
机构
[1] Munich Univ Appl Sci, Photon Lab, Lothstr 34, D-80335 Munich, Germany
[2] MAN Energy Solut SE, Werftstr 17, D-94469 Deggendorf, Germany
[3] Tech Univ Munich, Inst Measurement Sci & Sensor Technol, Theresienstr 90, D-80333 Munich, Germany
关键词
fiber Bragg grating; multipoint measurement; temperature profile monitoring; regenerated grating; high-temperature sensing; chemical reactors; BRAGG GRATING SENSORS; REGENERATED GRATINGS; FIBERS; DECAY; BORON;
D O I
10.3390/s19245476
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A low-drift fiber-optic sensor system, consisting of 24 regenerated fiber Bragg gratings (RFBG), equally distributed over a length of 2.3 m, is presented here. The sensor system can monitor spatially extended temperature profiles with a time resolution of 1 Hz at temperatures of up to 500 degrees C. The system is intended to be used in chemical reactors for both the control of the production ramp-up, where a fast time response is needed, as well as for production surveillance, where low sensor drifts over several years are required. The fiber-optic sensor system was installed in a pilot test reactor and was exposed to a constant temperature profile, with temperatures in the range of 150-500 degrees C for more than two years. During this period, the temperature profile was measured every three to five months and the fiber-optic temperature data were compared with data from a three-point thermocouple array and a calibrated single-point thermocouple. A very good agreement between all temperature measurements was found. The drift rates of the 24 RFBG sensor elements were determined by comparing the Bragg wavelengths at a precisely defined reference temperature near room temperature before and after the two-year deployment. They were found to be in the range of 0.0 K/a to 2.3 K/a, with an average value of 1.0 K/a. These low drift rates were achieved by a dedicated temperature treatment of the RFBGs during fabrication. Here, the demonstrated robustness, accuracy, and low drift characteristics show the potential of fiber-optic sensors for future industrial applications.
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页数:14
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