Device for the measurement of a displacement of an object using a self-mixing technique

Device for the measurement of a displacement of an object using a self-mixing technique

A device for the measurement of a displacement of an object (2) uses a self-mixing technique. A laser (1) such as a laser diode having a laser cavity and allowing mode hopping to occur is used in conduction with an external cavity (12) encompassing the laser cavity (11) and being linked to said obje...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BUEHLER, STEEVE, MEIER, CHRISTOPH
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ANALOGOUS ARRANGEMENTS USING OTHER WAVES
DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES
INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK
PHYSICS
RADIO DIRECTION-FINDING
RADIO NAVIGATION
TESTING
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Beschreibung
Zusammenfassung:A device for the measurement of a displacement of an object (2) uses a self-mixing technique. A laser (1) such as a laser diode having a laser cavity and allowing mode hopping to occur is used in conduction with an external cavity (12) encompassing the laser cavity (11) and being linked to said object (2). A first photo detector (31) is provided to measure the AM variation of the laser signal of the laser (1). The device further comprises an optical-frequency-to-intensity-converter (3) receiving a laser signal of the laser (1). This converter can be a Fabry-Perot resonator eg. in the form of a PMMA film. A second photo detector (4) is provided receiving the converted signal (24) transmitted through the optical-fequency-to-intensity-converter (3) to generate a frequency modulated output signal representing the displacement or velocity to be measured.