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US 8,683,845 B2Granted
Carbon dioxide sensor and associated method for generating a gas measurement value
AssigneeSiemens Aktiengesellschaft
InventorsMaximilian Fleischer, Roland Pohle, Stefan Stegmeier
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Abstract
A gas sensor detects carbon dioxide, for example for use in air-conditioning systems. The gas sensor is based on a field effect transistor construction. It has a polymer-based material sensitive to carbon dioxide as gas-sensitive layer. The material has a cross-sensitivity with respect to air humidity. The influence of humidity is compensated for by using the signal of a humidity sensor.
Claims15
An apparatus to detect a carbon dioxide content in air, comprising:
- at least one gas sensor to output a gas measurement value;
- at least one humidity sensor to output a humidity measurement value;
- and
- a device to correct the gas measurement value using the humidity measurement value, wherein
- the gas sensor comprises a gas-sensitive material which responds to carbon dioxide and comprises primary amino groups,
- the gas sensor is configured to generate the gas measurement value through an evaluation of a work function of the gas sensitive material,
- the device to correct the gas measurement value is configured to correct for an influence, irrespective of carbon dioxide presence, of air humidity on the gas measurement value, and
- the device to correct the gas measurement value is configured to correct for an influence of air humidity on a strength of a response of the gas sensor to carbon dioxide.
5 more elements
A method for generating a gas measurement value representing a carbon dioxide concentration in air, comprising:
- generating a gas measurement value by evaluating a work function of a material comprising primary amino groups, the gas measurement value being evaluated using at least one gas sensor, the gas measurement value being influenced by the carbon dioxide concentration;
- using a humidity sensor to generate a humidity measurement value;
- and
- using the humidity measurement value to correct an influence, irrespective of carbon dioxide presence, of air humidity on the gas measurement value and,
- using the humidity measurement value to correct for an influence of air humidity on a strength of a strength of a response of the gas sensor to carbon dioxide.
2 more elements
Dependencies are inferred from the claim text.