Self-calibrated active pyrometer for furnace temperature measurements

Patent · Thu Jan 01 00:00:00 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 (United States)
• 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

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