FLUID PRESSURE SENSOR

摘要

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, andthird 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.

主权项

1. A fluid pressure sensor, this sensor comprising:
a flexible pipe extending around and along a central axis, this pipe being adapted to contain the fluid the pressure of which must be measured and to be deformed by the effect of the pressure exerted by the fluid, between: a first deformed position for a first pressure exerted by the fluid, the pipe having in this first position different first and second locations on its periphery the orthogonal projections of which in a plane perpendicular to the central axis are separated by a distance d1, and a second deformed position for a second pressure exerted by the fluid higher than the first pressure, in the second position the orthogonal projections of the first and second locations in the plane perpendicular to the central axis are separated by a distance d2, the difference between the distances d2 and d1 being at least greater than 0.1 d2, a coil the self inductance of which varies as a function of the pressure of the fluid inside the flexible pipe, this coil including at least one turn wound around a winding axis of the coil coinciding with the central axis of the pipe, said 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 this first portion to this first location, and 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 this second portion to this second location so that the area of this turn varies as a function of the deformation of the pipe, a unit for calculating the pressure of the fluid as a function of the self inductance of the coil,wherein the turn includes a third portion and a fourth portion of its periphery situated between the first and second portions and each on a respective side of the central axis of the pipe, these third and fourth free portions being each separated from the flexible pipe by a clearance.