Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Erosion
Patent
1976-12-20
1978-09-05
Krawczewicz, Stanley T.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Erosion
324 65R, 73 27R, 340634, G01N 2700
Patent
active
041123565
ABSTRACT:
In a gas detector circuit a semiconductive detector, such as a Taguchi detector, is disposed in gas communication with the gas to be detected. The detector has a sensing resistor incorporated therein with a value of resistance that changes in accordance with the concentration of the gas constituent being detected. This type of detector provides an output signal with a temperature dependence caused by the temperature coefficient of the resistance of the resistive detector with a negative sign. The temperature dependent output signal derived from the detector is fed to one input of a differential amplifier for comparison against a second input to derive an output signal which is fed to an alarm and/or meter and/or recorder. A feedback signal portion of the output of the differential amplifier is fed back to the second input of the differential amplifier, as a feedback component of the second input, via the intermediary of a gain control resistor. The supply current drawn by the differential amplifier has a positive temperature coefficient and the supply current is passed through a resistor to derive a correction voltage which is superimposed on the feedback voltage of the differential amplifier to compensate for the temperature coefficient of the semiconductive detector.
REFERENCES:
patent: 3482233 (1969-12-01), Ogg
patent: 3820398 (1974-06-01), Rekai
patent: 3937061 (1976-02-01), Rhodes, Jr.
patent: 3961247 (1976-06-01), Toke
patent: 3997837 (1976-12-01), Betz et al.
Aine Harry E.
Krawczewicz Stanley T.
Lowhurst Harvey G.
Sunderdick Vincent J.
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