Self-calibrated active pyrometer for furnace temperature measurements

Patent · Thu Jan 01 04:00:00 EST 1998

OSTI ID:871735

Woskov, Paul P ^[1]; Cohn, Daniel R ^[2]; Titus, Charles H ^[3]; Surma, Jeffrey E ^[4]

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1. Bedford, MA
2. Chestnuthill, MA
3. Newtown Square, PA
4. Kennewick, WA

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA
• DOE Contract Number: AC06-76RL01830
• Assignee: Massachusetts Institute of Technology (Cambridge, MA); Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 5785426
• OSTI ID: 871735
• Country of Publication: United States
• Language: English

Related Subjects

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active
adapted
allow
alternative
alternative embodiment
alternatively
auxiliary
base
base plate
beam
beam energy
beam superimposed
calibration
chopper
conjunction
constructed
embodiment
emission
emissivity
employ
energy
energy reflected
field-of-view
flow
form
furnace
furnace temperature
gas
gas flow
heterodyne
heterodyne millimeter
including
inert
inert gas
insulating
insulating refractory
interference
interference pattern
interference patterns
laser
laser beam
mapping
measured
measurement
measurements
microwave
microwave source
millimeter
obtaining
patterns
peak
peak value
plate
portion
probe
probe beam
probing
pyrometer
radiation
receive
receive radiation
receiver
reflected
reflection
reflector
refractory
related
replaceable
self-calibrated
serves
simultaneous
simultaneous measurement
sleeve
slow
source
sub-millimeter-wave
superimposed
surface
surface emissivity
surface temperature
temperature
temperature measure
temperature measurement
temperature measurements
time
translatable
values
visible
visible laser
waveguide