Patent · US Active

Method and apparatus for the spatially resolved measurement of a physical variable

US8818762B2 · kind B2 · utility

0Cited by

3References

17Claims

0Family size

Assignee

LIOS TECHNOLOGY GMBH · DE

Inventors

Wieland Hill · Odenthal, DE
Martin Fromme · Cologne, DE
Jochen Kübler
Ingo Roda

Key dates

Filing date	Jun 17, 2011
Grant date	Aug 26, 2014
Priority date	—
Expiry date	Apr 30, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG01K2219/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A device for spatially resolved measuring of a physical variable has a device for generating a first electrical signal with a first frequency and a device for generating a second electrical signal with a second frequency. The second frequency differs from the first frequency by a difference frequency. An optical radiation source generates an optical signal modulated by the first frequency. The optical signal can interact with a test object and be modified in the process. A mixer can mix an electrical signal emerging from the optical signal with the second signal. A device, particularly embodied as a DDS system, generates a third electrical signal with a third frequency that corresponds to the difference frequency or a multiple of the difference frequency. A digital/analog converter digitizes the at least one mixed signal by sampling the mixed signal at the third frequency in order to digitize it.

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