Thermal measuring and testing – Temperature measurement – By a vibratory effect
Patent
1981-10-15
1983-11-22
Frankfort, Charles E.
Thermal measuring and testing
Temperature measurement
By a vibratory effect
374122, 128736, G01K 100
Patent
active
044165528
ABSTRACT:
Correlation thermography permits high resolution passive remote thermal radiation sensing for non-invasive temperature measurement of the interior of a body. At least two directional transducers are coupled to the surface of the body at different locations about the body in such a manner that their directional receiving patterns intersect. These transducers may be acoustic or electromagnetic transducers, but in any case are capable of receiving thermally-generated energy from inside the body and generating corresponding electrical signals. The intersection of the receiving patterns of the transducers defines a common volume which is relatively small, and the signals at each transducer originating from this common volume within the body exhibit a high degree of correlation. A multiplier receives the electrical signals produced by the transducers. A fixed or variable delay is interposed between at least one of the transducers and the multiplier. A low pass filter or integrator is connected to average the product output signal from the multiplier and thereby generate a correlation output signal which is a measure of the thermally-generated energy within the common volume of intersection of the directional receiving patterns of the transducers.
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Hessemer, Jr. Robert A.
Perper Lloyd J.
Bowen Theodore
Frankfort Charles E.
Hessemer, Jr. Robert A.
Perper Lloyd J.
Schuster David R.
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