Fluid pressure sensor
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsJacques Reverdy, Thierry Thomas
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Abstract
This fluid pressure sensor includes a coil the self inductance of which varies as a function of the pressure of a fluid inside the flexible pipe. This coil includes a turn including: a first portion and a second portion of its periphery rigidly mechanically connected to a first location and a second location on the periphery of the pipe, respectively, and third and fourth free portions of the periphery of the turn situated between the first and second portions and each on a respective side of a central axis of the pipe and each separated from the flexible pipe by a clearance.
Claims12
A fluid pressure sensor, comprising:
- a flexible pipe extending around and along a central axis of the pipe, being configured to contain a fluid having a pressure to be measured, and to be deformed by an effect of the pressure exerted by the fluid, between:
- a first deformed position for a first pressure exerted by the fluid, in the first deformed position the pipe having on its periphery a first location and a second location, wherein respective orthogonal projections of the first location and the second location in a plane perpendicular to the central axis are separated from each other by a first distance, and
- a second deformed position for a second pressure exerted by the fluid that is higher than the first pressure, wherein in the second deformed position respective orthogonal projections of the first location and the second location in the plane perpendicular to the central axis are separated from each other by a second distance, a difference between the first distance and the second distance being at least greater than 0.1 times the second distance;
- a coil having a self-inductance that varies as a function of the pressure exerted by the fluid inside the pipe, the coil including at least one turn wound around a winding axis of the coil coinciding with the central axis, the at least one turn including:
- a first portion of its periphery mechanically connected to the first location on the periphery of the pipe by a first mechanical connection, which rigidly connects the first portion to the first location,
- a second portion of its periphery, separate from the first portion, mechanically connected to the second location on the periphery of the pipe by a second mechanical connection, separate from the first mechanical connection, which rigidly connects the second portion to the second location, so that an area defined by the at least one turn varies as a function of the deformation of the pipe, and
- a third portion and a fourth portion of its periphery situated between the first portion and the second portion, each of the third portion and the fourth portion being on a respective side of the central axis, the third portion and the fourth portion being free portions separated from the pipe by a clearance;
- and
- a unit configured to calculate the pressure to be measured as a function of the self-inductance of the coil.
Dependencies are inferred from the claim text.