Self-calibrated active pyrometer for furnace temperature measurements
First Claim
1. Pyrometer for temperature measurement comprising:
- a heterodyne millimeter/sub-millimeter-wave or microwave receiver, the receiver adapted to receive radiation from a surface whose temperature is to be measured, wherein a path of the radiation received by the receiver is a field-of-view of the pyrometer;
a millimeter/sub-millimeter-wave or microwave probe beam source, which emits a probe beam which is reflected from the surface into the receiver; and
apparatus for mapping out interference patterns associated with the probe beam source and obtaining peak values therefor for emissivity calculation,wherein the radiation from the surface includes a surface emission portion and a surface reflection portion including the reflected probe beam, the surface emission portion being related to the surface temperature and the surface reflection portion being related to the emissivity of the surface.
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Accused Products
Abstract
Pyrometer with a probe beam superimposed on its field-of-view for furnace temperature measurements. The pyrometer includes a heterodyne millimeter/sub-millimeter-wave or microwave receiver including a millimeter/sub-millimeter-wave or microwave source for probing. The receiver is adapted to receive radiation from a surface whose temperature is to be measured. The radiation includes a surface emission portion and a surface reflection portion which includes the probe beam energy reflected from the surface. The surface emission portion is related to the surface temperature and the surface reflection portion is related to the emissivity of the surface. The simultaneous measurement of surface emissivity serves as a real time calibration of the temperature measurement. In an alternative embodiment, a translatable base plate and a visible laser beam allow slow mapping out of interference patterns and obtaining peak values therefor. The invention also includes a waveguide having a replaceable end portion, an insulating refractory sleeve and/or a source of inert gas flow. The pyrometer may be used in conjunction with a waveguide to form a system for temperature measurements in a furnace. The system may employ a chopper or alternatively, be constructed without a chopper. The system may also include an auxiliary reflector for surface emissivity measurements.
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Citations
23 Claims
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1. Pyrometer for temperature measurement comprising:
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a heterodyne millimeter/sub-millimeter-wave or microwave receiver, the receiver adapted to receive radiation from a surface whose temperature is to be measured, wherein a path of the radiation received by the receiver is a field-of-view of the pyrometer; a millimeter/sub-millimeter-wave or microwave probe beam source, which emits a probe beam which is reflected from the surface into the receiver; and apparatus for mapping out interference patterns associated with the probe beam source and obtaining peak values therefor for emissivity calculation, wherein the radiation from the surface includes a surface emission portion and a surface reflection portion including the reflected probe beam, the surface emission portion being related to the surface temperature and the surface reflection portion being related to the emissivity of the surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification