Patent ID: 7880886

Claim:
A gas sensor for measuring at least one gas concentration for a vehicle climate control system, comprising: a substrate; an IR radiation source fastened on the substrate; an IR detector fastened on the substrate; a measurement chamber for receiving a gas having the gas concentration that is to be measured; a shielding device situated in the measurement chamber between the IR radiation source and the IR detector, for shielding a direct transmission of IR radiation from the IR radiation source to the IR detector along an optical axis; and a reflective surface that has a concavely curved first mirrored area for receiving the IR radiation emitted by the IR radiation source, and that has a concavely curved second mirrored area that reflects the IR radiation to the IR detector, wherein the measurement chamber is formed between the reflective surface and the substrate; wherein the IR radiation source emits IR radiation at an angle of incidence of less than 45° to the first mirrored area.