Infrared source for a gas sensor for determining gas concentrations inside a vehicle, comprises a first layer having a first transmission characteristic and a second layer having a second transmission characteristic

摘要

Infrared source (10) comprises a first layer (102) having a first transmission characteristic and a second layer (103) having a second transmission characteristic. The combination of the transmission characteristics effects a band pass filter characteristic for an operating frequency region. An Independent claim is also included for a gas sensor having an infrared source.