Apparatus and method for remote temperature measurement
First Claim
1. An apparatus for remotely measuring a temperature of a moving anisotropic surface, comprising:
- detector means including a radiation receptor for detecting infra-red radiation emitted and reflected by said surface;
an integrating cavity at least partially surrounding said receptor for receiving radiation emitted and reflected by said moving surface, when facing said cavity, and delivering said radiation to said receptor;
means for generating at least two infra-red radiation-containing beams within said integrating cavity positioned to cause said beams to strike said surface from different directions and at angles suitable for at least partial reflection to said receptor; and
means for determining said temperature of said surface from said radiation detected by said detector means.
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Accused Products
Abstract
An apparatus and method for remotely measuring emissivity and hence temperature of a surface of an object. The apparatus includes a detector having a radiation receptor for measuring infra-red radiation, an integrating cavity surrounding the receptor for receiving radiation from a surface facing the cavity and delivering the radiation to the receptor, at least two sources of infra-red containing radiation (e.g. light from an incandescent lamp) within the integrating cavity positioned to produce separate beams of the radiation which strike the surface at different angles suitable for reflection to the receptor, and a processor for determining the temperature of the surface from the radiation measured by the detecting means. The use of at least two mutually angled radiation beams compensates for surface anisotropy of the surface whose temperature is to be measured. The infra-red containing radiation is modulated to cause an on/off fluctuation of the intensity of the radiation so that the component of the signal from the detector resulting from reflected radiation can be distinguished from the component due to radiation emitted from the surface due to its temperature. The radiation is preferably measured at two different wavelengths so that a ratio technique may be employed. The resulting measurements can be used to determine the reflectivity, and hence the emissivity, of the surface as well as the intensity of emitted radiation, so that accurate temperature measurements can be made from standard formulae used for optical pyrometry.
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Citations
21 Claims
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1. An apparatus for remotely measuring a temperature of a moving anisotropic surface, comprising:
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detector means including a radiation receptor for detecting infra-red radiation emitted and reflected by said surface; an integrating cavity at least partially surrounding said receptor for receiving radiation emitted and reflected by said moving surface, when facing said cavity, and delivering said radiation to said receptor; means for generating at least two infra-red radiation-containing beams within said integrating cavity positioned to cause said beams to strike said surface from different directions and at angles suitable for at least partial reflection to said receptor; and means for determining said temperature of said surface from said radiation detected by said detector means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of remotely measuring a temperature of a moving anisotropic surface, comprising:
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directing at least two infra-red radiation-containing beams from within an integrating cavity onto said surface from different directions and at angles that result in at least partial reflection of said beams into said cavity; collecting within said integrating cavity radiation from said beams reflected by said surface together with infra-red radiation emitted by said surface due to said temperature of said surface to produce combined radiation having an intensity; measuring the intensity of said combined radiation; and calculating said temperature of said surface from said measured intensity. - View Dependent Claims (18, 19, 20, 21)
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Specification