Method for gas detection with potential controlled gas sensor

摘要

A potential-controlled gas sensor comprises a gas-sensitive region (5) which can be polarized independent of moisture and has a relative dielectric constant ( epsilon ) depending on the moisture. An Independent claim is also included for a process for gas detection comprising changing a relative dielectric constant ( epsilon ) of at least one polarizable gas-sensitive region, and measuring a potential change ( DELTA phi ) using the change in the relative dielectric constant. Preferred Features: The degree of the gas-sensitive layer can be changed using a control signal, especially a voltage. The gas-sensitive region contains an electret, especially BaCO3. The gas sensor contains several gas-sensitive regions with different layer thicknesses.