Patent · US Active

Device and method for measuring relative movement

US7920249B2 · kind B2 · utility

4Cited by

8References

13Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Carsten Heinks · Nordhorn, DE
Marcel F. Schemmann · Maria Hoop, NL

Key dates

Filing date	Dec 20, 2006
Grant date	Apr 5, 2011
Priority date	—
Expiry date	Aug 7, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG06F3/0421
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A device for measuring movement of an object (15) and the device relative to each other. The device comprises a laser (3) for generating a measuring beam (13), which is converged by a lens (10) in an action plane. Radiation reflected by the object (15) is converged to re-enter the laser cavity to generate a self-mixing effect in the laser (3). Measuring means (4) are provided to receive the reflected measuring beam radiation and enable the frequency difference between the measuring beam (13) and the reflected measuring beam radiation to be determined, which is representative of the relative movement.

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