Chemistry: analytical and immunological testing – Measurement of electrical or magnetic property or thermal... – By means of a solid body in contact with a fluid
Patent
1984-04-25
1986-02-25
Richman, Barry S.
Chemistry: analytical and immunological testing
Measurement of electrical or magnetic property or thermal...
By means of a solid body in contact with a fluid
73 23, 324 65R, 422 94, 422 98, 436152, G01N 2716
Patent
active
045729000
ABSTRACT:
A method and apparatus to automatically compensate for temperature variation in a vapor detection system. In one embodiment, two identical organic semiconductor film sensors in close thermal contact with each other are used in the feedback circuit of an inverting amplifier supplied by constant voltage. One of the sensors is isolated from vapor exposure to act as a reference for the other sensor which is used for vapor sampling. The output of the inverting amplifier provides an indication of the presence and relative concentration of vapor exposure. Variation in sample sensor resistance due to a change in temperature is accompanied by the same corresponding change in the reference sensor, which stabilizes the ratio of the feedback circuit resistances and therefore the gain of the inverting amplifier to exactly compensate for the temperature induced resistance variations automatically.
REFERENCES:
patent: 4112356 (1978-09-01), Toy
patent: 4217544 (1980-08-01), Schmidt
patent: 4350660 (1982-09-01), Robinson et al.
patent: 4361802 (1982-11-01), Luijpers
patent: 4381922 (1983-05-01), Frey et al.
H. Wohltjen et al., "Chemical Microsensors for Chemical Vapor Detection", oc. Int. Symp. Protection Against Chemical Warfare Agents, Stockholm, Sweden, Jun. 6-9, 1983, pp. 51-59.
Beers Robert F.
Ellis William T.
Gzybowski Michael S.
Richman Barry S.
The United States of America as represented by the Secretary of
LandOfFree
Organic semiconductor vapor sensing method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Organic semiconductor vapor sensing method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Organic semiconductor vapor sensing method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1013041