BRIGHTNESS AND TWO-COLOR PYROMETRY APPLIED TO THE ELECTRON BEAM FURNACE
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
A procedure for temperature measurement and control in an electron beam furnace was established by using the optical and two-color pyrometers. The emissivity of the specimen and attenuation by the furnace sight-port glass and metallic vapor coatings introduced errors in the readings made by both instruments. These errors in two-color readings were considerably less than those in readings made with the optical pyrometer. To permit the determination of the true temperature of a test specimen, and empirical correlation was made between the temperature of a blackbody hole and the brightness of a surface simulating that of a test specimen. The accuracy of this correlation is discussed with respect to the quality of the blackbody holes, the errors in sight-port glass corrections, instrument calibration, and the accumulated statistical uncertainties of pyrometer readings.
- Test Facilities, Equipment and Methods