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1. (WO1993017314) CAPTEUR DE PRESSION A FIBRE OPTIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. An optical fibre pressure sensor in which two or more lengths of side-hole fibre are joined together at their ends, in which at a joint the two pieces are rotated relative to one another around their common longitudinal axis, in which one or more lengths of side-hole fibre have their holes sealed, and in which one or more lengths of side-hole fibre, have their holes exposed to the same pressure as is external to that length of fibre.

2. An optical fibre pressure sensor according to claim 1 in which the angle of rotation at the join between fibre lengths is substantially 90°.

3. An optical fibre pressure sensor according to claim 2 in which the angle of rotation at the join between fibre lengths is exactly 90°.

4. An optical fibre pressure sensor according to any one of the preceding claims in which the total lengths of fibre which have sealed side-holes and open side-holes are substantially equal.

5. An optical fibre pressure sensor according to claim 4 in which the total lengths of fibre which have sealed side-holes and open side-holes are exactly equal.

6. An optical fibre pressure sensor according to any one of the preceding claims in which light delivery and light collection means are connected to the side-hole fibres.

7. An optical fibre pressure sensor according to claim 6 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.

8. An optical fibre pressure sensor according to claim 6 or claim

7 in which the light delivery and light collection means are connected to the side-hole fibres by fusion splicing.

9. An optical fibre pressure sensor according to any one of claim 1 to 5 in which a length of side-hole fibre is connected between two othe lengths of side-hole fibres such that the side-holes of the fibre are seale at the joints, and the side-holes of the other ends remain open to externa pressure.

10. An optical fibre pressure sensor according to any one of th preceding claims and including an optical fibre which acts both a delivery and collection means.

1 1. An optical fibre pressure sensor according to any one of claim 1 to 9 and including an optical fibre polariser, thereby to form polarimetric interferometer.

12. An optical fibre pressure sensor according to any one of claim

1 to 9 and including a partially reflective mirror from which a portion o light is reflected back through the side-hole fibres to delivery means, an from which another portion of light is transmitted to collection means.

13. An optical fibre pressure sensor according to any one of claim

1 to 9 and including a Fabry-Perot polarimetric interferometer in whic the ends of the side-hole fibres include partially reflective mirror inserted into an optical waveguide.

14. An optical fibre pressure sensor according to any one of claim

1 to 9 and including a Fabry-Perot polarimetric interferometer in whic an optical fibre acts both as light delivery and collection means, ligh being partially reflected from a first mirror and from a second mirro which is at the end of the side-hole fibre.

15. An optical fibre pressure sensor substantially as herei described with reference to the accompanying drawings.