Gas sensor
First Claim
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1. A gas sensor for detecting the presence of a gas, the sensor comprising:
- a layer of semiconducting organic polymer;
means for applying an alternating electric signal to the layer;
means for varying the frequency of said signal; and
means for detecting the variation in impedance characteristics of said layer in the presence of said gas.
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Abstract
A gas sensor has a layer of a semiconductor organic polymer, such as polypyrrole which is exposed to a gas to be detected. An alternating electric signal of varying frequency is applied to the sensor by an analyser, which detects the change in impedance characteristics of the sensor. The characteristics obtained are compared by microcomputer with reference characterisitcs stored in a memory. The resulting difference spectra depend on the gas in contact with the sensor and so the gas can be detected.
61 Citations
6 Claims
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1. A gas sensor for detecting the presence of a gas, the sensor comprising:
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a layer of semiconducting organic polymer; means for applying an alternating electric signal to the layer; means for varying the frequency of said signal; and means for detecting the variation in impedance characteristics of said layer in the presence of said gas. - View Dependent Claims (2, 3)
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4. A method of detecting a gas comprising:
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applying an alternating electric signal to a layer of a semiconducting organic polymer, said layer being exposed to said gas; varying the frequency of said alternating signal; and
investigating the variation in impedance characteristics of said layer, thereby to detect said gas. - View Dependent Claims (5, 6)
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Specification