Compact injection molded optical module for gas sensing

An optical module component for a gas sensor, comprising:

• a first housing portion;
• and
• a second housing portion,
• wherein the first housing portion and the second housing portion are configured to be joined together and to form a substantially cylindrical optical cavity when joined together,
• wherein a lower inner surface of the optical cavity is formed by the first housing portion and an upper inner surface of the optical cavity is formed by the second housing portion,
• wherein the optical module component further comprises:
• a first opening for receiving light from a light source;
• at least one second opening for passing light from the optical cavity to a detector;
• a first mirror that directs the light from the light source into at least one wall inside the optical cavity;
• and
• a second mirror that directs the light from the at least one wall inside the optical cavity to the detector,
• wherein optical axes of the first and second mirrors are tilted with respect to a diametral plane of the optical cavity, and
• wherein the first housing portion comprises a guiding reflector for reflecting the light from the light source to the first mirror via an inner surface of the guiding reflector, wherein the guiding reflector has a truncated cone shape with a smaller diameter part pointing towards the light source to cause reflection of the light to reflect off the inner surface of the guiding reflector before reaching the optical cavity.