Patent ID: 8378287

Claim:
Optical sensor module for a measuring device, which module comprises at least one optical sensor including a diode laser having a laser cavity for generating a measuring beam, the diode laser being attached to a substrate, converging means for converging the measuring beam in an action plane and for converging in the laser cavity measuring beam radiation that has been back-scattered by an object to generate a self-mixing effect and means for measuring the self-mixing effect, which means comprise a photo diode and an associated signal processing circuitry, wherein the diode laser is configured to emit laser radiation through said substrate, said laser radiation having a wavelength for which the substrate being attached to the diode laser is transparent, said converging means being arranged on a side of the substrate and the diode laser being attached to the other side of the substrate, said photo diode functioning as a carrier for said diode laser, said diode laser and said photo diode being mutually mechanically and electrically connected.