Integrated optical sensor arrangement with detecting means, and means for controlling the optical emission wavelength of the light beam source

US5113066A · kind A · utility

Assignee

• DR. JOHANNES HEIDENHAIN GMBH · DE

Inventors

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

Key dates

• Filing date: Apr 8, 1991
• Grant date: May 12, 1992
• Expiry date: Apr 8, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B10/572
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

In an integrated optical arrangement, such as a photoelectric position measuring arrangement, a diffraction grid is scanned by light beam diffraction by a scanning unit having a laser. A light beam bundle emanating from the laser is split by the diffraction grid into two diffraction beam bundles, which are inserted into the top input waveguides of a waveguide coupler by two coupling elements. The two diffraction beam bundles interfere in the waveguide coupler and impinge on three detectors located at three output waveguides of the waveguide coupler for obtaining measured values. For readjustment of the optimal emission wavelength of the laser, an additional diffraction beam bundle emanating from the diffraction grid is entered into said integrated optical sensor arrangement by an additional coupling element. The additional beam bundle triggers a detector for generating a control signal to control the optimal emission wavelength of the laser.