High-Temperature, High-Bandwidth Fiber Optic Pressure and Temperature Sensors for Gas Turbine Applications

2004 ◽  
Author(s):  
Robert Fielder ◽  
Matthew Palmer ◽  
Wing Ng ◽  
Matthew Davis ◽  
Aditya Ringshia
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Fiber Optic ◽  
Temperature Sensors ◽  
High Bandwidth

Failure Mechanisms of Fiber Optic Temperature Sensors in High Temperature and Vibration Environments

MRS Advances ◽  
2016 ◽  
Vol 1 (35) ◽  
pp. 2427-2437
Author(s):  
Loucas Tsakalakos ◽  
Uttara A. Dani ◽  
Boon K. Lee ◽  
Susanne M. Lee ◽  
Sudeep Mandal ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Failure Modes ◽  
Fiber Optic ◽  
Failure Mechanisms ◽  
Temperature Sensors ◽  
Fiber Optic Probe ◽  
Silica Fibers ◽  
Fiber Optic Temperature

ABSTRACTFiber optic temperature sensors are used in a variety of harsh environment applications. We have explored use of such temperature sensors in commercial gas turbines to measure the temperature at various regions of interest within the turbine system. More specifically, fiber optic temperature rakes were designed and installed on a commercial gas turbine under full load conditions. This work will focus on failure mechanisms observed at multiple length scales that impact the performance of high temperature optical fiber sensors. It was found that Au-coated silica fibers, which are a standard in the industry, undergo various failure modes when subjected to combinations of high temperature and high vibration. More specifically, the Au coating became soft/ductile as the temperature is increased. We also observed that the Au coating was not well bonded to the silica fiber, as expected since there were no adhesion layers present. These effects led to significant damage of the fiber optic under high vibrations. We also found that vibrations from the gas turbine coupled into fundamental modes of the fiber optic probe assembly, which were analyzed by detailed dynamic mechanical analysis. This led to the fiber impacting the internal wall of the probe assembly, which caused further damage and failure of the fiber and the Au coating. The silica fibers returned from the field also exhibited significant twisting throughout most of their length. This suggests the fibers reached temperatures above their strain point (about 1000 C for pure silica glass), which is explained by either a) the strain point had been significantly reduced by the presence of the Ge dopant, or b) the temperature was higher than expected in the gas turbine exhaust region. It was also hypothesized that complex anelastic effects may play a role under the high temperature, high vibration environment experienced by the probes. Detailed structural analysis of the fiber optic temperature sensors by scanning electron microscopy, ToF-SIMS, and X-ray microscopy will be presented to corroborate the above simulations and proposed damage mechanisms. Finally, we note that the fiber Bragg gratings (FBG) present within the temperature probes provided promising temperature data, and were in fact not damaged/erased by the high temperature environment.

Application of fiber optic high temperature sensors for structural monitoring of structures submitted to fire

2014 ◽  
Vol 102 (7) ◽  
pp. 2932-2938 ◽  
Author(s):  
Paula Rinaudo ◽  
Benjamín Torres Górriz ◽  
David Barrera Villar ◽  
Ignacio Payá Zaforteza ◽  
Pedro Calderon Garcia ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Temperature Sensors ◽  
Structural Monitoring

Epoxy-free high-temperature fiber optic pressure sensors for gas turbine engine applications

2004 ◽  
Author(s):  
Juncheng Xu ◽  
Gary Pickrell ◽  
Bing Yu ◽  
Ming Han ◽  
Yizheng Zhu ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Gas Turbine Engine ◽  
Turbine Engine

Vacuum-sealed high temperature high bandwidth fiber optic pressure and acoustic sensors

2005 ◽  
Author(s):  
Juncheng Xu ◽  
Gary R. Pickrell ◽  
Xingwei Wang ◽  
Bing Yu ◽  
Kristie L. Cooper ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Acoustic Sensors ◽  
High Bandwidth

Design of fiber optical high temperature sensors for gas turbine monitoring

2009 ◽  
Author(s):  
M. Willsch ◽  
T. Bosselmann ◽  
P. Flohr ◽  
R. Kull ◽  
W. Ecke ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Temperature Sensors ◽  
Fiber Optical

High-Bandwidth Fiber-Optic Pressure Sensors for High-Temperature Aerospace Applications

2018 ◽  
Author(s):  
Behzad Moslehi ◽  
W Price ◽  
Richard J. Black ◽  
Ming Han ◽  
Alireza Behbahani ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Aerospace Applications ◽  
High Bandwidth

scholarly journals Response of Distributed Fiber Optic Temperature Sensors to High-Temperature Step Transients

2018 ◽  
Vol 18 (21) ◽  
pp. 8755-8761 ◽  
Author(s):  
Kelly M. McCary ◽  
Brandon A. Wilson ◽  
Anthony Birri ◽  
Thomas E. Blue
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Temperature Sensors ◽  
Temperature Step ◽  
Fiber Optic Temperature
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