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Title: Development and testing of an advanced technology vibration transducer. Final report

Abstract

The goal is to develop and test high-temperature fiber optic sensors and show that they are suitable for monitoring vibration and other instabilities in gas turbine engines. Transducers with the fiber optic Fabry-Perot interferometer (FFPI) configuration have been adapted for use in the turbomachinery environment. To ensure the survival of the FFPI sensors at high temperatures, two techniques for coating the fibers with metal have been developed: electroplating and vacuum deposition. Coated sensors have subsequently been embedded in aluminum and brass alloys. Experiments on a small Sargent Welch turbine engine have shown the high sensitivity of embedded FFPI strain sensors to vibration in rolling bearings. Data have been collected in both the time and frequency domain. A new accelerometer design in which a metal-coated fiber containing the FFPI element is soldered directly to a diaphragm in a stainless steel housing shows response similar to a piezoelectric accelerometer in shaker table tests. The high sensitivity of the FFPI accelerometer has been demonstrated in field tests in a Solar Centaur turbine engine, and the design has survived temperatures > 500 C in a test oven. A magnetometer with a physical configuration similar to that of the accelerometer has been used to measuremore » the distance from the sensor head to a rotating shaft made of ferromagnetic material. This device, which functions as a proximity probe, has been used to monitor shaft rotation rate (key phasor application) and as a shaft thrust position sensor. These results indicate the potential for performing critical measurements in turbine engines with FFPI sensors. They can measure acceleration, distance (proximity), strain (as it relates to bearing defect diagnosis), and gas pressure, and can operate at higher temperatures than conventional transducers.« less

Authors:
Publication Date:
Research Org.:
Texas A and M Univ., College Station, TX (United States). Dept. of Electrical Engineering
Sponsoring Org.:
American Gas Association, Inc., Arlington, VA (United States)
OSTI Identifier:
441674
Report Number(s):
AGA-97003271
TRN: AHC29705%%19
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 8 Jul 1996
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 03 NATURAL GAS; GAS TURBINE ENGINES; DIAGNOSTIC TECHNIQUES; PROGRESS REPORT; TRANSDUCERS; MECHANICAL VIBRATIONS; MONITORING; DESIGN; PERFORMANCE; FABRY-PEROT INTERFEROMETER; OPTICAL FIBERS; PROTECTIVE COATINGS; ACCELEROMETERS; MAGNETOMETERS; STRAIN GAGES

Citation Formats

Taylor, H F. Development and testing of an advanced technology vibration transducer. Final report. United States: N. p., 1996. Web.
Taylor, H F. Development and testing of an advanced technology vibration transducer. Final report. United States.
Taylor, H F. Mon . "Development and testing of an advanced technology vibration transducer. Final report". United States.
@article{osti_441674,
title = {Development and testing of an advanced technology vibration transducer. Final report},
author = {Taylor, H F},
abstractNote = {The goal is to develop and test high-temperature fiber optic sensors and show that they are suitable for monitoring vibration and other instabilities in gas turbine engines. Transducers with the fiber optic Fabry-Perot interferometer (FFPI) configuration have been adapted for use in the turbomachinery environment. To ensure the survival of the FFPI sensors at high temperatures, two techniques for coating the fibers with metal have been developed: electroplating and vacuum deposition. Coated sensors have subsequently been embedded in aluminum and brass alloys. Experiments on a small Sargent Welch turbine engine have shown the high sensitivity of embedded FFPI strain sensors to vibration in rolling bearings. Data have been collected in both the time and frequency domain. A new accelerometer design in which a metal-coated fiber containing the FFPI element is soldered directly to a diaphragm in a stainless steel housing shows response similar to a piezoelectric accelerometer in shaker table tests. The high sensitivity of the FFPI accelerometer has been demonstrated in field tests in a Solar Centaur turbine engine, and the design has survived temperatures > 500 C in a test oven. A magnetometer with a physical configuration similar to that of the accelerometer has been used to measure the distance from the sensor head to a rotating shaft made of ferromagnetic material. This device, which functions as a proximity probe, has been used to monitor shaft rotation rate (key phasor application) and as a shaft thrust position sensor. These results indicate the potential for performing critical measurements in turbine engines with FFPI sensors. They can measure acceleration, distance (proximity), strain (as it relates to bearing defect diagnosis), and gas pressure, and can operate at higher temperatures than conventional transducers.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {7}
}

Technical Report:
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