Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1981-06-11
1983-11-08
Kazenske, E. R.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
324 65R, 374183, G01K 720
Patent
active
044139179
ABSTRACT:
A temperature measuring system comprises a sensor which is connected to a supply rail through a first lead, and which may be selectively connected by a relay through a second lead or a third lead to the inverting input of an operational amplifier. The leads have different resistance values. The output of the amplifier is connected to its input through a resistor, and its non-inverting input is connected to the rail through a potential divider. The output of the amplifier is connected to a computer through a low pass filter and an A/D converter. In operation, the output voltage of the amplifier is first measured with the second lead connected to its inverting input and then measured again with the third lead connected. From these measurements the resistance of the sensor is calculated after calculating and hence eliminating the resistance of the leads. The sensed temperature can then be calculated from the resistance of the sensor.
REFERENCES:
patent: 3913403 (1975-10-01), Arcara
Corr Denis E.
Kazenske E. R.
Lucas Industries Limited
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