Full-spectrum multiwavelength pyrometry for nongray surfaces

Daniel Ng; Wallace D. Williams

doi:10.1117/12.58543

1 April 1992 Full-spectrum multiwavelength pyrometry for nongray surfaces

Daniel Ng, Wallace D. Williams

Proceedings Volume 1682, Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications; (1992) https://doi.org/10.1117/12.58543
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

A full-spectrum (encompassing radiation on both sides of the Wien displacement peak) multiwavelength pyrometer was developed. It measures the surface temperature of arbitrary nongray ceramics by curve fitting a spectrum in this spectral region to a Planck function of temperature T. This function of T is modified by the surface spectral emissivity. The emissivity function was derived experimentally from additional spectra that were obtained by using an auxiliary radiation source and from application of Kirchhoff's law. This emissivity was verified by results that were obtained independently by using electromagnetic and solid-state theories. In the presence of interfering reflected radiation this general pyrometry improves the accuracy of the measured temperature by measuring an additional spectrum that characterizes the interfering radiation source.

Citation Download Citation

Daniel Ng and Wallace D. Williams "Full-spectrum multiwavelength pyrometry for nongray surfaces", Proc. SPIE 1682, Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications, (1 April 1992); https://doi.org/10.1117/12.58543

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