초록 ▼

A method and apparatus for active pyrometric measurement of the temperature of a body whose emissivity varies with wavelength. The emissivity is inferred from reflectivity measured at two wavelengths in an irradiation wavelength band and extrapolated to a wavelength in an emission wavelength band. T

A method and apparatus for active pyrometric measurement of the temperature of a body whose emissivity varies with wavelength. The emissivity is inferred from reflectivity measured at two wavelengths in an irradiation wavelength band and extrapolated to a wavelength in an emission wavelength band. The extrapolated emissivity is used to correct a blackbody estimate of the temperature of the body in the emission wavelength band. The extrapolation, being temperature-dependent, is done iteratively. Both reflectivity and emission measurements are performed via a common optical head that is shaped, and is positioned relative to the body, so that the optical head has a sufficiently large solid angle of acceptance that the measured temperature is independent of superficial roughness of the body.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for determining a temperature of a body that emits radiation at a plurality of wavelengths, the body having an emissivity that varies with wavelength, the body being located in an environment, the body having an absorption edge that depends on the environment,

[ What is claimed is:] [1.]1. A method for determining a temperature of a body that emits radiation at a plurality of wavelengths, the body having an emissivity that varies with wavelength, the body being located in an environment, the body having an absorption edge that depends on the environment, the method comprising the steps of:(a) determining the emissivity of the body in an irradiation wavelength band;(b) inferring the emissivity of the body in a first emission wavelength band, different from said irradiation wavelength band, from said emissivity in said irradiation wavelength band;(c) receiving radiation emitted by the body in said first emission wavelength band;(d) measuring a first signal representative of an intensity of the emitted radiation received from the body in said first emission wavelength band; and(e) inferring the temperature of the body from said first signal and from the emissivity determined in said first emission wavelength band. [30.]30. An apparatus for determining a temperature of a body, comprising:(a) an optical head for receiving radiation emitted by the body, and(b) a mechanism for positioning said optical head relative to the body so that the temperature of the body, as determined by the apparatus, is substantially independent of a superficial roughness of the body.