Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1993-11-10
1995-02-21
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
2503381, 250351, 331155, 359240, G01J 508, G01K 100
Patent
active
053910010
ABSTRACT:
An instrument is provided for measuring the temperature of an object from infrared radiation emitted by the object. The instrument includes a radiation detector, a temperature indicating device connected to the detector, and a modulator disposed in a path of a radiation beam from the object for converting the beam into a series of pulses when the modulator is vibrated in and out of the path. The modulator includes a primary piezoelectric element adapted to vibrate when subjected to driving signals at a frequency related to the resonant frequency of the modulator, and a secondary piezoelectric element connected with and driven by the primary piezoelectric element. The secondary piezoelectric element is electrically insulated from the primary piezoelectric element. The modulator also includes a blocking element connected with the secondary piezoelectric element and disposed to move in and out of the path of the beam. A phase locked loop oscillator circuit is connected to the primary and secondary piezoelectric elements for operating the primary element. The secondary piezoelectric element is adapted to generate a signal indicative of the phase and frequency of the primary piezoelectric element to lock the circuit at the resonant frequency of the modulator.
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Anderson Norman C.
Rupert Robert E.
Weiss Morris
Gutierrez Diego F. F.
Infratemp, Inc.
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