Positional tracking using light beams with constant apparent frequencies
US10746854B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2017 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Dec 20, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems described herein use outside-in positional tracking. A base station emits one or more rotational light beams to illuminate a local area. The rotational light beams rotate around a rotation axis and are used for positional tracking of one or more objects in the local area. A beam waist of a source light beam for generating the rotational light beams is positioned to be within a distance range from a center of rotation of the rotational light beams. An apparent frequency of the particular rotational light beam can be constant or substantially constant throughout a local area. Because the apparent frequency of the particular rotational light beam is constant or substantially constant throughout the local area, the frequency response of a detector in response to the illumination by the rotational light beam is within a limited range of values irrespective of the detector's location within the local area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.