Infrared Techniques for Air Temperature Measurements in a Hypersonic Wind Tunnel

摘要

Infrared spectroradiometric techniques were developed for measurement of high gas temperatures with microsecond time resolution. Procedures for using a high speed monochromatic radiation pyrometer were established, and temperatures in gaseous detonations were measured to determine instrument performance. Breadboard modifications were made to the high speed pyrometer to enable its use for measuring air temperatures in the Mach 20 Hypersonic Wind Tunnel at the Aeronautical Research Laboratories, Wright-Patterson Air Force Base, Ohio. The temperature measuring technique was demonstrated at ARL by measuring the temperature of a propane-air flame at atmospheric pressure with the high speed infrared pyrometer installed on the wind tunnel. The flame was located in the test cabin and the measured temperature was 2050K. Applications of the pyrometer to temperature measurement in the settling chamber and in the test cabin directly in front of the model in the Mach 20 wind tunnel were considered. (Author)