Pressure measuring device and method
AssigneeSchlumberger Technology Corporation
InventorsXu Wu, Arthur Hartog, Dimitri Cadere, Tsutomu Yamate
Life of this patent
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Abstract
A device to measure a fluid pressure comprises a pressure sensing element 10 and a pressure readout element 20. The pressure sensing element 10 comprises a cavity 11 capped by a flexible membrane 13, the cavity having a length d that varies with the fluid pressure P1 applied on the flexible membrane 13. The pressure readout element 20 comprises a light source 24 for providing an incident beam of a determined wavelength range directed towards the cavity and an optical spectral analyzer 25 for measuring a power spectrum of a return beam reflected by the cavity, and processing means 27 for determining the cavity length d and the fluid pressure P1 based on the power spectrum.
Claims24
A device to measure a fluid pressure comprises a pressure sensing element and a pressure readout element (20), wherein:
- the pressure sensing element comprises a cavity capped by a flexible membrane, the cavity having a length (d) that varies with the fluid pressure (P1) applied on the flexible membrane, and
- the pressure readout element comprises a light source for providing an incident beam of a determined wavelength range directed towards the cavity and an optical spectral analyzer for measuring a power spectrum of a return beam reflected by the cavity, and processing means for determining the cavity length (d) and the fluid pressure (P1) based on the power spectrum.
A fluid pressure measuring method, comprising the steps of:
- submitting (S1) to a first fluid pressure (P1) a cavity (11) capped by a flexible membrane (13), the cavity having a length (d) that varies with the fluid pressure (P1) applied on the flexible membrane (13),
- providing (S2) an incident beam of a determined wavelength range directed towards the cavity,
- measuring (S3) a power spectrum of a return beam reflected by the cavity,
- determining (S4) the measurements of cavity length (d) based on the power spectrum, and
- determining (S5) the measurements of the fluid pressure (P1) based on the cavity length (d).
Dependencies are inferred from the claim text.