Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1977-10-12
1979-04-10
Ruehl, Charles A.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01K 724
Patent
active
041482204
ABSTRACT:
A thermistor temperature sensing system includes a conventional comparator having a constant reference threshold voltage and a linearized thermistor sensor which in combination detect a limited range of desirable temperatures. A means is also disclosed for extending the linearization of the thermistor in a piecewise manner at at least one temperature extreme where linearity typically severely deteriorates. In a thermistor temperature sensing system, linearization of thermistor characteristics with respect to at least one temperature within the temperature extreme is achieved by utilizing circuitry which makes the threshold voltage of the conventional comparator a function of the setting of a potentiometer for a desired temperature within the temperature extreme to be sensed by a thermistor sensor. The piecewise linearization technique disclosed allows easy interface with the thermistor temperature sensing system for detection of an optimum of selectable temperatures in the extended range of linearized characteristics of the thermistor.
REFERENCES:
patent: 3973147 (1976-08-01), Yu
patent: 4023094 (1977-05-01), Adams
patent: 4035787 (1977-07-01), Hornung
patent: 4060715 (1977-11-01), Scott
P. R. Mallory & Co. Inc.
Ruehl Charles A.
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