Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1995-10-06
1998-07-28
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374128, 374131, 374 9, 374130, 374122, G01J 508, G01J 562
Patent
active
057854262
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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Cohn Daniel R.
Surma Jeffrey E.
Titus Charles H.
Woskov Paul P.
Battelle (Memorial Institute)
Gutierrez Diego F. F.
Massachusetts Institute of Technology
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