Patent · US Active

Time of flight camera system

US9726762B2 · kind B2 · utility

2Cited by

2References

5Claims

0Family size

Assignee

PMD TECHNOLOGIES AG · DE

Inventors

Ralph Wilks · Meckenbeuren, DE
Christian Prestele · Tettnang, DE

Key dates

Filing date	Apr 26, 2013
Grant date	Aug 8, 2017
Priority date	—
Expiry date	Feb 21, 2034

Classification

Technology area (CPC G)Physics
CPC primaryG01S17/894
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A light transit time camera system and method for operating such a system which can be operated with at least three modulation frequencies, having the steps a) determining a phase shift (φi) of an emitted signal (Sp1) and a received signal (Sp2) for a modulation frequency (f1, f2, f3) in a phase-measuring cycle (PM1, PM2, . . . ), b) carrying out a plurality of phase-measuring cycles (PM1, PM2, . . . ), c) determining a distance value (dn,n+1) on the basis of the phase shifts (φn, φn+1) determined in two successive phase-measuring cycles (PMn, PMn+1), in a distance-measuring cycle (M1, M2, . . . ), d) carrying out a plurality of distance-measuring cycles (M1, M2, . . . ), e) determining a distance deviation (Δd) between the distance values of successive distance-measuring cycles, f) outputting of a distance value (dn,n+1) as a valid distance value if the distance deviation (Δd) is within a tolerance limit (Δdtol) is provided.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.