G - Physics – 01 – J
Patent
G - Physics
01
J
73/112, 73/52
G01J 5/10 (2006.01) F01D 17/08 (2006.01) G01J 5/00 (2006.01)
Patent
CA 1203998
Abstract of the Disclosure It is known to use a pyrometer system for measuring the temperature of blades of a gas-turbine engine, in which a high-resolution radiation pyrometer supplies signals to a detector unit. In the present invention the detector unit includes an inverter that inverts the pyrometer output and supplies these signals via a diode to one electrode of a capacitor. The other electrode of the capacitor is grounded, a resistor being connected across the capacitor so that it is slowly discharged. The charge on the capacitor approximately follows the high- value/low-temperature signals which are reinverted to give an averaged temperature indication. The diode is short-circuited for periods approximately equal to the time of passage of one blade across the pyrometer's field of view and at a frequency approximately equal to the blade rotational frequency. During these periods the charge on the capacitor drops to the instantaneous value of the pyrometer output, producing a low-voltage/high- temperature spike. The detector unit includes a store to which these spikes are supplied after reinversion. The store has a long time period so as to produce a signal which approximately follows the tips of the high temperature spikes.
445022
Fetherstonhaugh & Co.
Meggitt (uk) Limited
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