A new gas sensor electronic interface with generalized impedance converter

A new gas sensor conditioning circuit that allows a direct resistance-to-frequency conversion, as well as the procedure for the design, is presented. The generalized impedance converter (GIC) proposed is configured as a variable capacitor connected with the capacitor timing terminal of an astable mu...

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Published inSensors and actuators. B, Chemical Vol. 134; no. 2; pp. 591 - 596
Main Authors Albornoz, Alejandro Durán Carrillo de, Ramírez Muñoz, Diego, Moreno, Jaime Sánchez, Berga, Silvia Casans, Antón, Edith Navarro
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.09.2008
Subjects
Gas sensor
Generalized impedance converter
Quasi-digital sensor
Resistance-to-frequency conversion
Sensor conditioning
Gas sensor
Sensor conditioning
Quasi-digital sensor
Resistance-to-frequency conversion
Generalized impedance converter
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Summary:A new gas sensor conditioning circuit that allows a direct resistance-to-frequency conversion, as well as the procedure for the design, is presented. The generalized impedance converter (GIC) proposed is configured as a variable capacitor connected with the capacitor timing terminal of an astable multivibrator implemented by a PSoC (programmable system on chip) microcontroller device. The GIC effective input impedance, which is controlled by the gas sensor resistance, controls the astable output frequency. Good correlation of the experimental output frequency, which depends on the gas concentration, is achieved. The circuit is a simple gas sensor digital interface with frequency output.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2008.06.001