Infrared Surface Temperature Measurements in the Presence of Reflected Radiation
Abstract
A method is described for determining surface temperature in the presence of radiation being reflected by the surface of interest from another nearby hot surface. Radiance measurements are made on the surface of interest and on the nearby hot object in three different wavelength bands (three colors). If the emittance of the target surface varies significantly with wavelength, it is necessary to know the ratios of emittances in the three wavelength bands. An experiment was performed to demonstrate the three-color technique, and results are reported. The three-color technique was shown to be highly sensitive to non- gray behavior. Application of the three-color technique with corrections for non-gray behavior resulted in temperature measurement errors less than 2 percent in the presence of reflected radiation. Conventional ratio pyrometry (two colors) resulted in errors greater than 10 percent in the presence of reflected radiation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA225660
Entities
People
- A. G. Jackson
Organizations
- Arnold Engineering Development Complex