Patent · US Active

Measurement of speed or vibration characteristics using a LIDAR device with heterodyne detection

US8179521B2 · kind B2 · utility

10Cited by

11References

23Claims

0Family size

Assignee

ONERA · FR

Inventors

Matthieu Valla · Massy, FR
Claudine Besson · Les Ulis, FR
Beatrice Augere · Palaiseau, FR

Key dates

Filing date	Nov 17, 2010
Grant date	May 15, 2012
Priority date	—
Expiry date	Dec 9, 2030

Classification

Technology area (CPC G)Physics
CPC primaryG01S17/58
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A process for measuring speed or vibration characteristics using a LIDAR device allows the separation of a useful contribution and an interfering contribution in a backscattered signal. To this purpose, a phase characteristic of an optical wave emitted in the direction of a target volume is modulated. The interfering contribution, which originates from a source at a distance from the target volume, appears with variable shifts of said phase characteristic in a heterodyne detection signal. An accumulation then isolates the useful contribution, from which a result is obtained for the speed or vibration measurement. The process can be implemented with a frequency modulation or phase modulation of the optical wave.

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