Abstract
Metrological support to data-acquisition systems (DAS) is improtant in providing comparability in the measured characteristics of gas-turbine engines (GTE) during development, routine production, and operation. A basic problem in the dynamic calibration of a means of measurement is to reproduce the test signal. This can be illustrated for laser systems designed for the dynamic calibration of temperature and pressure-measurement channels, which are the most widely used in testing GTE. A laser system is described that enables one to determine the amplitude, phase, transient, and pulse characteristics of thermoanemometers, resistance thermometers, and thermoelectric thermometers, including thin-wire and thin-film components, with various gas flow speeds and temperatures. This apparatus can be used in calibrating thermal transducers at frequencies up to 200 kHz with a basic error of 0.5 dB. The gas speed range is 0-200 m/sec with a maximum gas temperature of 600 degrees K. Laser methods provide dynamic calibration for pressure channels in DAS. Dynamic calibration has been applied to pressure transducers by means of a pulsed laser. The light pulse is supplied to the sensing element and produces the dynamic equivalent of a pressure pulse.
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