Patent · US Expired

Apparatus and method having at least one waveguide coupler to create at least two signals having a mutual phase shift not equal to 180 degrees

US5162869A · kind A · utility

6Cited by

3References

13Claims

0Family size

Assignee

JOHANNES HEIDENHAIN GmbH · DE

Inventors

Dieter Michel · Traunstein, DE
Andreas Franz · Ludwigsburg, DE

Key dates

Filing date	Dec 21, 1990
Grant date	Nov 10, 1992
Priority date	—
Expiry date	Dec 21, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/35303
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In an arrangement with at least one waveguide coupler, two photo beam bundles are supplied to both of the inputs of the waveguide coupler by two input grids and are brought to interference in the coupling area. A damping element is provided in the coupling area of the waveguide coupler for obtaining at the two outputs two signals having a mutual phase shift of other than 180.degree. by two detectors.

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