FABRY-PEROT BASED SPEED SENSOR

Apparatus and associated methods relate to optically determining rotation frequency of a rotatable member using a Fabry-Perot cavity formed between a mirror and a movable reflective mirror. A cavity dimension between the mirror and a movable reflective mirror changes in response to movement of the m...

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Bibliographic Details
Main Authors Miller, Mark Sherwood, Vallamkondu, Aswin Kumar, Annamareddy, Ramesh
Format Patent
LanguageEnglish
Published 11.08.2022
Subjects
COLORIMETRY
INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK
PHYSICS
RADIATION PYROMETRY
TESTING
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Summary:Apparatus and associated methods relate to optically determining rotation frequency of a rotatable member using a Fabry-Perot cavity formed between a mirror and a movable reflective mirror. A cavity dimension between the mirror and a movable reflective mirror changes in response to movement of the movable reflective mirror. The movable reflective mirror is bonded to a magneto-strictive material having a thickness dimension that changes in response to changes in a magnetic field. A magnet generates the magnetic field, which changes in response to rotation of the rotatable member.
Bibliography:Application Number: US202117403827