Patent ID: 11921956
Assignee: AMS SENSORS SINGAPORE PTE. LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. A method comprising:
emitting, by a light source, light of a particular wavelength toward a target surface having a non-uniform design that includes a high-reflectivity region and a low-reflectivity region for light of the particular wavelength;
receiving in a photodetector at least some of the light that was emitted by the light source and subsequently reflected by the target surface; and
correlating an output from the photodetector with a distance to the target surface;
wherein a response curve of the photodetector, for different distances to the target surface, is more linear than if the target surface had a uniform high- or low-reflectivity across the entirety of the target surface.