Evanescent fiber optic pressure sensor apparatus

Details Evanescent fiber optic pressure sensor apparatus Evanescent fiber optic pressure sensor apparatus

1981-01-19

1982-11-23

Gensler, Paul L.

Communications, electrical: acoustic wave systems and devices

Borehole testing

73705, 73DIG11, 350 9629, 367149, 250227, G01L 900, G02B 726

Patent

active

043602479

ABSTRACT:
An apparatus is disclosed for optically sensing pressure using evanescent wave coupling between two fiber optics. A support base with a channel holds the two waveguides, one on top of the other, with the portion of the waveguide having the cladding material removed in the channel. An upper member having a diaphragm is attached to the support base. The diaphragm has a pedestal attached that is in slight contact with one of the waveguides. When pressure is exerted upon the diaphragm, the waveguides are forced closer together thus affecting the amount of evanescent coupling therebetween.

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