Sensor for detection of gas and method for detection of gas

A sensor for detection of transcutaneous gas comprising a contact face which is configured to be directed towards a measuring site and the sensor further including at least one gas diffusion path, at least one radiation source for emission of measuring radiation, a measurement volume for receiving the gas to be measured, and a detector for detection of electromagnetic radiation, said detector comprising at least a first detection surface and a second detection surface and at least one wavelength sensitive element,

• wherein the wavelength sensitive element is substantially transparent for radiation of wavelengths in a first wavelength band incident onto the wavelength sensitive element in a first range of incidence angles and for radiation of wavelengths in a second wavelength band incident onto the wavelength sensitive element in a second range of incidence angles, the first and the second wavelength bands are at least partly different from each other, and the first and the second ranges of incidence angles are at least partly different from each other, the first detection surface and the second detection surface and the at least one wavelength sensitive element are arranged such that radiation in the first wavelength band propagates through the wavelength sensitive element such that the radiation in the first wavelength band impinges on said first detection surface and is detectable by said first detection surface and such that radiation of the second wavelength band propagates through the wavelength sensitive element such that the radiation of the second wavelength band impinges on said second detection surface and is detectable by said second detection surface.