Aspirating pyrometer with platinum thermocouple and radiation sh

Details Aspirating pyrometer with platinum thermocouple and radiation sh Aspirating pyrometer with platinum thermocouple and radiation sh

1992-12-11

1994-09-20

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

374138, 374203, 374179, G01K 1302, G01K 108

Patent

active

053483952

ABSTRACT:
An aspirating or suction pyrometer for measuring hot combustion gases. A thermocouple in the pyrometer has a temperature sensitive junction formed of platinum alloys. The thermocouple junction is insulated and is encased within a platinum alloy sheath. The sheathed thermocouple is mounted within inner and outer tubular radiation shields. These shields are formed of a platinum alloy having a radiation emissivity substantially the same as the thermocouple. The shields block radiated heat from the flame and combustion chamber from being transferred to the thermocouple. The radiation shields do not themselves radiate heat to the thermocouple because the shields and thermocouple are at the same temperature and formed of substantially the same noble alloys.

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"Measurement of Jet Engine Combustion Temperature by the Use of Thermocouples and Gas Analysis," R. C. Williamson et al, Society of Automotive Engineers, Inc., National Air Transportation Meeting, New York, N.Y. Apr. 21-24, 1969.
"Gas Thermocouple Radiation Corrections," General Electric Technical Information Series, L. Berkley et al, No. 75-GTD-40, Jun. 2, 1975.

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