Optical distance measuring device and method for optical distance measurement

US9395440B2 · kind B2 · utility

Assignee

• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Olaf Schrey · Ratingen, DE
• Werner Brockherde · Duisburg, DE
• Bedrich Hosticka · Rübhausen, DE
• Wiebke Ulfig · Zwingenberg, DE

Key dates

• Filing date: Apr 7, 2009
• Grant date: Jul 19, 2016
• Expiry date: Apr 25, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S17/894
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention describes an optical distance measuring device having a pulsed radiation source that is implemented to transmit, in a temporally contiguous radiation pulse period, a radiation pulse having a pulse duration tp that is shorter than the radiation pulse period, and to transmit no radiation pulse in a temporally contiguous dark period. Further, the optical distance measuring device includes a detector for detecting different amounts of radiation in two overlapping detection periods during the radiation pulse period to capture reflections of the radiation pulse at an object surface and a background radiation and/or in two overlapping detection periods during the dark period to capture background radiation. The optical distance measuring device further includes an evaluator determining a signal depending on a distance of the optical distance measuring device to an object based on the detected amount of radiation. Further, the present invention provides a method for optical distance measurement and for multiple sampling.