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1. (US5515459) Optical fibre pressure sensor
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
I claim:
1. An optical fibre pressure sensor in which at least two lengths of side-hole fibre are joined together at adjacent ends of the lengths of side-hole fibre, in which at a joint the two lengths of side-hole fibre are rotated relative to one another around a common axis, in which at least one length of side-hole fibre has its side-hole sealed, and in which at least one length of side-hole fibre has its side-hole exposed to a pressure which is the same as a pressure which is external to that length of side-hole fibre.
2. An optical fibre pressure sensor according to claim 1 in which light delivery and light collection means are connected to the side-hole fibres.
3. An optical fibre pressure sensor according to claim 2 in which the light delivery and light collection means are connected to the side-hole fibres by means of optical fibres such that the side-holes in one length of the fibre are left open and the side-holes in another length of fibre are sealed at the joint.
4. An optical fibre presure sensor according to claim 2 in which the light delivery and light collection means are connected to the side-hole fibers by fusion splicing.
5. An optical pressure sensor according to claim 1 in which the angle of rotation at the joint between fibre lengths is substantially 90°.
6. An optical fibre pressure sensor according to claim 1 in which the total lengths of fibre which have sealed side-holes and open side-holes are substantially equal.
7. An optical fibre pressure sensor according to claim 1 in which a length of side-hole fibre is connected between two other lengths of side-hole fibres such that the side-holes of the fibre are sealed at the joints, and the side-holes of the other ends remain open to external pressure.
8. An optical fibre pressure sensor according to claim 1 and including an optical fibre which acts both as delivery and collection means.
9. An optical fibre pressure sensor according to claim 1 and including an optical fibre polarizer, thereby to form a polarimetric interferometer.
10. An optical fibre pressure sensor according to claim 1 and including a partially reflective mirror from which a portion of light is reflected back through the side-hole fibres to delivery means, and from which another portion of light is transmitted to collection means.
11. An optical fibre pressure sensor according to claim 1 and including a Fabry-Perot polarimetric interferometer in which the ends of the side-hole fibres include partially reflective mirrors inserted into an optical waveguide.
12. An optical fibre pressure sensor according to claim 1 and including a Fabry-Perot polarimetric interferometer in which an optical fibre acts both as light delivery and collection means, light being partially reflected from a first mirror and from a second mirror which is at the end of the side-hole fibre.