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

Claim 0:
1. An apparatus comprising:
a target surface having a non-uniform design including a high-reflectivity region and a low-reflectivity region for light of a particular wavelength, wherein a position of the target surface is displaceable within the apparatus;
a light source operable to emit light at the particular wavelength toward the target surface;
a photodetector operable to sense at least some of the light emitted by the light source and subsequently reflected by the target surface; and
a processor operable to correlate 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.