A report describes experiments using multiwavelength pyrometry to determine the surface temperature of the end tip inside a BeO cylinder that is part of a probe designed to measure high-temperature gases. The cylinder is heated by the gas into which it is inserted, and the gas temperature is related to the tip temperature via a mathematical model of the probe. The probe was tested in two atmospheric burner experiments. The measured interior temperatures were 1,360 and 1,745 K. Available temperature information on the burner flame is lower, being at 1,300 and 1,580 K, respectively. This was so because the thermocouples performing the measurement were positioned at the cooler periphery of the jet to avoid being destroyed by hot gases at the burner's central flow, the hot temperature of which the BeO probe was successful in measuring.

This work was done by Gustave Fralick and Daniel Ng of Glenn Research Center. To obtain a copy of the report, "Pyrometric Gas and Surface Temperature Measurements," access the Technical Support Package (TSP) free on-line at www.nasatech.com/tsp under the Physical Sciences category.

Inquiries concerning rights for the commercial use of this invention should be addressed to

NASA Glenn Research Center
Commercial Technology Office
Attn: Steve Fedor
Mail Stop 4 —8
21000 Brookpark Road
Cleveland, Ohio 44135.

Refer to LEW-16972.