Gas sensors and sensor circuits

The gas sensor employs a platinum thin film notch filter circuit to adjust sensitivity and perform multi-point measurements by analyzing AC voltage signal changes, addressing sensitivity issues and reducing circuit size in multi-sensor systems.

JP7863333B2Active Publication Date: 2026-05-21UNIV OKAYAMA
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
UNIV OKAYAMA
Filing Date
2021-12-23
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing gas sensors face challenges in sensitivity optimization and adjustment, particularly in multi-sensor systems, where circuit size increases with the number of sensors, and sensitivity degradation is difficult to correct without replacing components.

Method used

A gas sensor using a notch filter circuit with series-connected first and second resistors of different resistance values, formed from platinum thin films, detects gas concentration by analyzing changes in amplitude or phase of an input AC voltage signal, allowing sensitivity adjustment and multi-point measurement with reduced transmission loss and disturbance.

Benefits of technology

The solution enables optimized sensitivity adjustment and multi-point measurement in a compact form factor, enhancing detection accuracy and flexibility in multi-sensor systems.

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Abstract

Provided are: a gas sensor that readily handles an increase in the number of sensors and can be adjusted for sensitivity; and a sensor circuit therefor.　The present invention is a gas sensor in which a filter circuit, that allows the passage of or blocks a prescribed AC voltage signal, serves as a sensor circuit, the gas sensor being equipped with said filter circuit, and the gas sensor being configured such that changes in the concentration of a gas being measured are detected from amplitude or phase changes in a signal outputted from the filter circuit. The gas sensor is configured such that the filter circuit is a notch / filter circuit that connects a first resistor (R1) and a second resistor (R2) in series, and the conductivity of the first resistor (R1) and second resistor (R2) change according to the concentration of the gas.
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