Pressure transducer with optical waveguide feedthrough assembly

Details Pressure transducer with optical waveguide feedthrough assembly Pressure transducer with optical waveguide feedthrough assembly

G - Physics

01

D

G01D 5/26 (2006.01) G01L 11/02 (2006.01) G02B 6/44 (2006.01)

Patent

CA 2548829

Optical sensors used in harsh environments require a sealed pressure tight passage of an optical waveguide into an interior of the sensor. In one embodiment, a pressure sensor assembly for determining the pressure of a fluid in a harsh environment includes a sensing element suspended within a fluid filled housing. An optical waveguide that provides communication with the sensing element couples to a feedthrough assembly, which includes a cane-based optical waveguide forming a glass plug sealingly disposed in the housing. The glass plug provides optical communication between the optical waveguide and the sensing element. A pressure transmitting device can transmit the pressure of the fluid to the fluid within the housing. The assembly can maintain the sensing element in a near zero base strain condition and can protect the sensing element from shock/vibration.

Capteurs optiques utilisés dans des conditions difficiles, chaque capteur devant comprendre un passage hermétique interne de guide d'ondes optique résistant à la pression. Dans un mode de réalisation, un ensemble capteur de pression servant à déterminer la pression d'un fluide dans des conditions difficiles comprend un élément de détection suspendu dans un logement rempli de fluide. Un guide d'ondes optique qui assure la communication avec l'élément de détection est couplé à un ensemble passage comprenant un guide d'ondes optique de type baguette qui forme un bouchon de verre placé de manière étanche dans le logement. Le bouchon de verre assure la communication optique entre le guide d'ondes optique et l'élément de détection. Un dispositif de transmission de la pression peut transmettre la pression du fluide au fluide se trouvant dans le logement. L'ensemble permet d'éviter presque entièrement toute déformation de base de l'élément de détection et peut protéger l'élément de détection des chocs et des vibrations.

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