Temperature measurements using multicolor pyrometry in thermal radiation heating environments

Abstract

Temperature measurements are important for thermal-structural experiments in the thermal radiation heating environments such as used for thermal-structural stress analyses. This paper describes the use of multicolor pyrometry for the measurements of diffuse surfaces in thermal radiation environments that eliminates the effects of background radiation reflections and unknown emissivities based on a least-squares algorithm. The near-infrared multicolor pyrometer had a spectral range of 1100-2400 nm, spectrum resolution of 6 nm, maximum sampling frequency of 2 kHz, working distance of 0.6 m to infinity, temperature range of 700-1700 K. The pyrometer wavelength response, nonlinear intensity response, and spectral response were all calibrated. The temperature of a graphite sample irradiated by quartz lamps was then measured during heating and cooling using the least-squares algorithm based on the calibrated irradiation data. The experiments show that higher temperatures and longer wavelengths are more suitable for the thermal measurements in the quartz lamp radiation heating system. This analysis provides a valuable method for temperature measurements of diffuse surfaces in thermal radiation environments.

Measurements of the directional spectral emissivity based on a radiation heating source with alternating spectral distributions

“…A quartz lamp array arranged along the inner arched surface of the steel chamber was used as the radiation heating source to heat the sample [38]. The experimental set up was shown in Fig.…”

Analysis of multi-band pyrometry for emissivity and temperature measurements of gray surfaces at ambient temperature

“…Besides, many models ignore the effect of reflected background radiation [4,[10][11][12][13][14][15], which is only valid if the background is much colder than the target surface [16,17]. As a result, more advanced dual-band and multi-band pyrometry systems have been proposed [17][18][19][20][21][22][23][24][25][26][27]. The multi-band model reported by Fu et al [18] indicates that multi-band pyrometry systems may be preferred over multiwavelength systems in the determination of surface temperature.…”

Application of multispectral radiation thermometry in temperature measurement of thermal barrier coated surfaces

“…This dynamic behavior of spectral emissivity poses a great challenge in the use of radiation thermometers. Multispectral radiation thermometry (MRT) can be used to address the above challenges and has widely been used in many applications [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] to measure temperature, mainly targeting metallic surfaces. Effectiveness of this technique is greatly dependent on emissivity model used.…”