A non-contact temperature sensor

A non-contact temperature sensor having a longitudinal axis X-X comprising:

• a housing;
• an opening at the forward end of the housing;
• a reflector that is located within the housing;
• at least one aperture that is located between the forward surface and the rearward surface of the reflector;
• a light detector arrangement located rearward of the reflector;
• wherein the light detector arrangement is orientated such that it can receive light passing through the at least one aperture;
• wherein
• the light detector arrangement is capable of detecting at least two ranges of wavelengths of infrared light, a first range of wavelengths of infrared light and a second range of wavelengths of infrared light, the first and second ranges of wavelengths of infrared light being discrete;
• and wherein
• the light detector arrangement outputs data for each of the at least two ranges of wavelengths of infrared light.