Patent ID: 11927441
Assignee: AMS INTERNATIONAL AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. A method of determining an optical power ratio for a self-mixing interferometry sensor module, wherein the sensor module comprises:
a light emitter to emit coherent electromagnetic radiation towards an external object,
a detector unit to generate output signals indicative of an optical power output of the light emitter due to self-mixing interferometry and
an optical element to direct a first fraction of electromagnetic radiation emitted by the light emitter towards the external target or the light emitter and to direct a second fraction of electromagnetic radiation is directed towards the detector unit, the method comprising:
determining a first optical power associated with the first fraction of electromagnetic radiation as a function of the optical element,
determining a second optical power associated with the second fraction of electromagnetic radiation as a function of the optical element, and
determining the ratio of first and second optical power.