Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1978-09-27
1980-06-10
Woodiel, Donald O.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
323 19, G01K 700
Patent
active
042066468
ABSTRACT:
A transducer is disclosed which provides a digital indication of a sensed analog condition without the need of an analog to digital (A/D) converter or a comparator. A condition responsive element having a true abrupt switching characteristic at a known breakover voltage as a function of a condition being sensed is biased by a voltage source preferably supplying a periodic voltage as a known function of time. The point during the voltage source cycle at which the condition responsive element switches to its other state is determined by the sensed condition. Preferably, a clock of known frequency is enabled when the condition responsive element is in one of its states, whereby clock pulses are counted during an interval whose duration is determined by the sensed condition. The number of clock pulses counted is a digital value of the analog condition being sensed because: (i) the clock frequency is known; (ii) the voltage/time relation of the voltage source is known; and (iii) the voltage/sensed condition relation of the condition responsive element is known. A thermally sensitive thyristor is specifically disclosed for the condition responsive element.
REFERENCES:
patent: 3475677 (1969-10-01), Swinehart et al.
patent: 3548290 (1970-12-01), Swinehart
patent: 3558995 (1971-01-01), Swinehart
patent: 3896369 (1975-07-01), Nakata
patent: 3950991 (1976-04-01), Grass
patent: 4100434 (1978-07-01), Iyotani et al.
Jaskolski Stanley V.
Lade Robert W.
Schutten Herman P.
Spellman Gordon B.
Eaton Corporation
Kees Nicholas A.
McCloskey Robert J.
Rather Hugh R.
Woodiel Donald O.
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