Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1985-06-13
1987-09-15
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
250351, 250548, 250339, 374153, G01N 2127, G01J 552
Patent
active
046936157
ABSTRACT:
A method and apparatus for determining the temperature of a hot body by a non-contact technique. It comprises a chopping disc 2 which may be disposed in the path of the radient heat energy from the object so providing a pulsed output of radient heat energy directed towards a pyroelectric element 7. Between the pyroelectric element 7 and the disc 2 is a further rotatable disc 4 having a pair of wavelength filters 6 and 6'. A microprocessor 14 operates to rotate the disc 4 to interpose each filter 6 and 6' in turn in the path of the pulsed output from the disc 2 at predetermined time intervals. The consequent output from the pyroelectric element 7 is, after amplification, rectification and smoothing in suitable circuits, fed to the microprocessor 14, which then calculates the ratio of the signal from the element 7 representative of power output through one of the filters, and the signal from element 7 representative of power output through the other filter. In this way the temperature of the hot body is determinable without prior knowledge of the emissivity characteristics of the hot body.
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