Measuring and testing – Gas analysis – Gas chromatography
Patent
1986-06-17
1988-03-15
Levy, Stewart J.
Measuring and testing
Gas analysis
Gas chromatography
331156, G01N 2700, H03L 102
Patent
active
047304782
ABSTRACT:
Apparatus for determining the proportion of a given gas component in a gas mixture, comprising a piezoelectric crystal provided with a surface layer containing a substance capable of selectively and reversibly adsorbing said gas component, and being so arranged that the gas mixture can be brought into contact with said surface layer. The crystal is incorporated in an oscillator circuit which produces an output signal representing the oscillating frequency of the crystal, and therewith the proportion of the given gas component in the gas mixture. For compensating the temperature dependency of the surface-layer adsorption of the relevant gas component, a thermistor (R.sub.T) is arranged to be influenced by the same temperature variations as the piezoelectric crystal. Further, the output signal (S) of the oscillator circuit is connected to the input of an amplifying circuit, which incorporates the thermistor (R.sub.T) and is so constructed that the degree of amplification of the circuit is dependent on the resistance of the thermistor in a manner such that the output signal (V.sub.U) deriving from the amplifying circuit is substantially independent of temperature variations of the surface layer of the piezoelectric crystal.
REFERENCES:
patent: 3164004 (1965-01-01), King, Jr.
patent: 3260104 (1966-07-01), King
patent: 3322981 (1967-05-01), Brenig
patent: 3879992 (1975-04-01), Bartera
patent: 3948081 (1976-04-01), Wessel et al.
patent: 4147513 (1979-04-01), Bienkowski et al.
patent: 4399686 (1983-08-01), Kindlund et al.
patent: 4412188 (1983-10-01), Helle et al.
patent: 4456892 (1984-06-01), Vandergraaf
patent: 4462246 (1984-07-01), Advani et al.
patent: 4572900 (1986-02-01), Wohltjen
ICOR AB
Levy Stewart J.
Williams Hezron E.
LandOfFree
Gas analyzer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas analyzer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas analyzer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1920123