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1 December 1991 Field testing of a fiber-optic rotor temperature monitor for power generators
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An optical technique has been developed for the on-line monitoring of rotor surface temperatures in electrical power generators. The method is based on the measurement of the decay time of the ultraviolet-laser-stimulated fluorescence produced by phosphors painted around the circumference of the rotor at selected locations along its length. At each location, a pair of optical fibers installed in stator cooling channels is used for light delivery and collection. The pulsing of the laser and the rotation of the rotor are synchronized so that the laser acts like a stroboscope to illuminate one small spot on the rotor surface, whose position can be altered by varying the triggering of the laser. A microprocessor-based signal analysis system has been designed and constructed to enable temperatures to be determined from the phosphor decay time data. Field tests on an operating 500-MW generator have yielded temperatures from 41 to 73 °C with a spatial resolution of 4 mm and an accuracy of ±2 °C. In the first installation, the phosphor was mixed with a silicone resin to produce a paint which lasted two years in the most adverse environment on the rotor. Efforts to improve the durability of the paint by using alternative binder materials have yielded encouraging results.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. K. Brown "Field testing of a fiber-optic rotor temperature monitor for power generators", Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991);

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