ON A READOUT TECHNIQUE FOR MONOCHROMATIC INFRARED GAS TEMPERATURE MEASUREMENT.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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It was desired to measure the temperature of a high velocity, high temperature, low density moving gas without disturbing the flow. The natural infrared energy loss of the gas led to an Infrared Monochromatic Radiation IMRA pyrometer as a measuring instrument, using the 4.5 micron CO2 band. The normal CO2 content in air is insufficient for absorption measurements to be made and additional CO2 seeding is required at gas pressures less than 1.5 atmospheres. Early attempts to prove this seeding method failed due to the IMRA pyrometers excessive noise and drift. A new circuit conditioning and readout technique was designed and now permits the measurement of temperature within 5 per cent to be made to pressures of 0.01 atmosphere or less. Author
- Test Facilities, Equipment and Methods