Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1982-08-25
1985-02-26
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
219328, 374112, 374120, 374153, 374 11, G01K 116, G01K 1304, G01K 1708
Patent
active
045015040
ABSTRACT:
The purpose of the invention is to provide means for non-contacting sensing of the surface temperature of objects. A member, adapted to be brought in the vicinity of the object, has an opening leading to a protective enclosure in which a temperature sensing element is mounted. Pumping means are provided to suck the ambient fluid, usually air, from the surface of the object through the opening into the protective enclosure, whereby the temperature sensing element takes up the fluid temperature, providing a fluid temperature signal. A gap is formed between the object and the member and the fluid flows in this gap before entering the opening and takes up a temperature between the object temperature and the member temperature. A second temperature sensing element is adapted to take up the temperature of the member providing a member temperature signal. Electronic circuits are provided to combine the fluid temperature signal and member temperature signal in a manner to obtain an object temperature signal which is a function of the surface temperature of the object unaffected by the temperature of the member. A differentiator may be added which provides a signal which is a function of the rate of change of the fluid temperature and is combined with the fluid temperature signal and the member temperature signal in a manner to obtain an object temperature signal of reduced time constant.
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Urmenyi Laszlo
Urmenyi William R.
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