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Novel room temperature carbon monoxide sensor utilizing rate of change of resistance in thick films of tin oxide
A room temperature thick-film semiconductor gas sensor has recently been developed in this laboratory for the measurement of carbon monoxide (CO) concentrations down to 10 ppm. Novel features of the fabrication process are the addition of a catalytic additive to enhance the sensitivity to CO, and a binding agent which results in an open porous structure to increase the effective surface area. The resistance Ro of sensors before exposure to CO varies in the range 100 kohm-30 Mohm, and the rate of change of sensor resistance dR/dt after exposure to CO is large, attaining a maximum value after several minutes. It is shown that the average rate of change of sensor resistance dR/dt is directly proportional to Ro with proportionality constant 10-3s-1. Circuitry is described, based on detection of the rate of change of sensor resistance, for a CO gas sensor capable of detecting small concentrations at the onset of a fire, before smoke particles are emitted. (Electronic Properties of Metal/Non-Metal Microsyst., Sheffield, GB, Aug 31 - Sep 3, 1993)
Novel room temperature carbon monoxide sensor utilizing rate of change of resistance in thick films of tin oxide
A room temperature thick-film semiconductor gas sensor has recently been developed in this laboratory for the measurement of carbon monoxide (CO) concentrations down to 10 ppm. Novel features of the fabrication process are the addition of a catalytic additive to enhance the sensitivity to CO, and a binding agent which results in an open porous structure to increase the effective surface area. The resistance Ro of sensors before exposure to CO varies in the range 100 kohm-30 Mohm, and the rate of change of sensor resistance dR/dt after exposure to CO is large, attaining a maximum value after several minutes. It is shown that the average rate of change of sensor resistance dR/dt is directly proportional to Ro with proportionality constant 10-3s-1. Circuitry is described, based on detection of the rate of change of sensor resistance, for a CO gas sensor capable of detecting small concentrations at the onset of a fire, before smoke particles are emitted. (Electronic Properties of Metal/Non-Metal Microsyst., Sheffield, GB, Aug 31 - Sep 3, 1993)
Novel room temperature carbon monoxide sensor utilizing rate of change of resistance in thick films of tin oxide
Neuer, bei Raumtemperatur arbeitender Kohlenmonoxidsensor auf Basis der Widerstandsänderung in Zinnoxiddickschichten
Williams, E.W. (author) / Lawlor, C.M. (author) / Keeling, A.G. (author) / Gould, R.D. (author)
International Journal of Electronics ; 76 ; 815-820
1994
6 Seiten, 3 Bilder, 4 Quellen
Article (Journal)
English
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