Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1982-12-02
1984-10-23
Frankfort, Charles
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
330256, 330289, G01K 700
Patent
active
044785275
ABSTRACT:
There is provided a differential amplifier having a plurality of inputs connected through input resistors to a summing junction at the inverting input of a differential amplifier which also has a negative feedback path having a feedback resistor. One of the input resistors is connected to the output signal of the primary element or transducer. A second of the input resistors is connected to a zero compensating signal which varies with changes in the temperature of the transducer from a certain value at a reference temperature. A third input resistor is connected to a fixed signal of a value which is adjusted to correspond to the certain value of the compensating signal at the reference temperature but of opposite polarity so as to tend to cancel the compensating signal when the transducer is at the reference temperature. The combination of the three inputs then produces an output from the differential amplifier corrected for changes in the zero of the measurement due to temperature changes.
REFERENCES:
patent: 3691405 (1972-09-01), Kendell
patent: 4215317 (1980-07-01), Traynor
patent: 4326171 (1982-04-01), Shaw et al.
patent: 4352053 (1982-09-01), Oguchi et al.
Frankfort Charles
General Signal Corporation
Huberfeld Harold
MacKay Raymond F.
Miller, Jr. William G.
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