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Method and apparatus for millimeter-wave detection of thermal waves for materials evaluation

Patent ·
OSTI ID:867845
 [1];  [2]
  1. Naperville, IL
  2. Downers Grove, IL
+ Show Author Affiliations

A method and apparatus for generating thermal waves in a sample and for measuring thermal inhomogeneities at subsurface levels using millimeter-wave radiometry. An intensity modulated heating source is oriented toward a narrow spot on the surface of a material sample and thermal radiation in a narrow volume of material around the spot is monitored using a millimeter-wave radiometer; the radiometer scans the sample point-by-point and a computer stores and displays in-phase and quadrature phase components of thermal radiations for each point on the scan. Alternatively, an intensity modulated heating source is oriented toward a relatively large surface area in a material sample and variations in thermal radiation within the full field of an antenna array are obtained using an aperture synthesis radiometer technique.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL
DOE Contract Number:
W-31109-ENG-38
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 5020920
OSTI ID:
867845
Country of Publication:
United States
Language:
English

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Related Subjects

/374/324/342/343/
alternatively
antenna
aperture
apparatus
array
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computer
detection
displays
evaluation
field
generating
heating
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in-phase
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material
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materials
measuring
method
millimeter-wave
millimeter-wave radio
modulated
monitored
narrow
obtained
oriented
phase
phase component
phase components
point-by-point
quadrature
quadrature phase
radiation
radiations
radiometer
radiometry
relatively
sample
scan
scans
source
spot
stores
subsurface
surface
surface level
synthesis
technique
thermal
thermal radiation
thermal waves
variations
volume
wave detection
wave radio
waves