Toward a calibration-free multi-band multi-wavelength pyrometry using low dynamic range CMOS cameras for combustion diagnostics
Document Type
Conference Proceeding
Publication Date
1-1-2018
Abstract
Temperature measurements based on spectral radiation emitted from a target surface are often limited by prior knowledge of the emissivity of the surface. As an alternative, multi-wavelength pyrometry approaches, in which thermal radiation is evaluated at two or more wavelengths, allow both emissivity and temperature of the target surface to be estimated, as long as the emissivity function is known. In the present work, a 10-bit CMOS near-infrared machine vision camera is employed to the evaluation of temperatures along a thin filament calibration target through a variation of the multi-wavelength pyrometry technique, in which prior knowledge of the emissivity function is not necessary. Optical bandpass filters are used to selectively limit the wavelengths imaged by the camera. The low dynamic range limitation of the CMOS sensor is overcome by the application of the high dynamic range (HDR) imaging technique. Temperature estimates are obtained from the resulting HDR image through a multiband multi-wavelength pyrometry. Measurements obtained from the thermoelectric effect in a thin butt-welded K-type thermocouples are used to validate the results from pyrometry for temperatures from 800K to 1400K.
Publication Source (Journal or Book title)
2018 Spring Technical Meeting of the Western States Section of the Combustion Institute, WSSCI 2018
Recommended Citation
Sauer, V., Roohani, S., & Schoegl, I. (2018). Toward a calibration-free multi-band multi-wavelength pyrometry using low dynamic range CMOS cameras for combustion diagnostics. 2018 Spring Technical Meeting of the Western States Section of the Combustion Institute, WSSCI 2018, 2018-March Retrieved from https://repository.lsu.edu/mechanical_engineering_pubs/2166
