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1. WO1999000653 - CAPTEUR DE PRESSION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims:
1. Device (100) for measurement of pressure in fluids,
characterized by
a section of optical fiber (171) containing a Bragg filter (150) wherein said Bragg filter is fixed
at a first point (151) to a first means (101) for exposure to a first fluid pressure, and fixed
at a second point (152) to a second means (135) for exposure to a second fluid pressure, so that the second means (135) is connected to the first means (101) and is formed for allowing reversible deformation by the second means (135) as a function of differential pressure, and in that way exert axial tension or relaxation in the Bragg grating (150).

2. Device according to Claim 1,
characterized in that
the first means is a substantially cylindrical housing (101) formed with a substantially cylindrical cavity (102) and an opening (103) that allows fluid communication between said second fluid pressure and the cavity (102),
the second means including:
- a closed, substantially cylindrical member (131) situated in said cylindrical cavity (102) and exhibiting a first free end closed against the cavity (102) with a lid, bottom or corresponding (137), and a second end fixed to the first means (101),
- a connection element (133) fixed to the bottom (137) of the cylindrical
member (131) for transfer of compression or tension of the cylindrical member (131) in its length to the second fastening point on the optical fiber section.

3. Device according to Claim 2,
characterized in that a first part of the connection element (133) is formed by a material having an neglectable thermal expansion coefficient and a second part thereof is formed by a material having a larger thermal expansion coefficient.

4. Device according to Claim 1-3,
characterized in that the optical fiber (171) is situated in a slot (170) formed in the external periphery of the first means (101) and in the length direction thereof.

5. Device according to Claim 2 or 3,
characterized in that the cylindrical member (131) is a metallic pipe having a relatively low ratio between wall thickness and pipe diameter.

6. Device according to Claim 2,
characterized in that the cylindrical member (131) is a substantially cylindrical bellows shape with a large compressability axially then radially.

7. Device according to Claim 6,
characterized in that the bellows is formed by metal for use in media with average to low pressure.

8. Device according to Claim 6,
characterized in that the bellows is formed by polymer or rubber for use in media with low pressure.

9. Device according to Claim 6 or 7,
characterized in that the bellows (131) is pretensioned by a spring means (136).