The measurement apparatus (50) comprises at least one hybrid elastic cable (52) wound around the deformable object (22), and a measurement unit (54) capable of measuring the inductance of a wire of the hybrid elastic cable (52) comprising a conductive material between two reference points (58).

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.

A system for non-intrusively measuring process fluid pressure within a process fluid conduit is provided. The system includes a measurement bracket configured to couple to an external surface of the process fluid conduit. The measurement bracket generates a variable gap based on deformation of the process fluid conduit in response to process fluid pressure therein. A gap measurement system is coupled to the measurement bracket and provides an electrical signal based on a measurement of the variable gap. A controller is coupled to the gap measurement system and is configured to calculate and provide a process fluid pressure output based on the electrical signal and information relative to the process fluid conduit.

A system for non-intrusively measuring process fluid pressure within a process fluid conduit is provided. The system includes a measurement bracket configured to couple to an external surface of the process fluid conduit. The measurement bracket generates a variable gap based on deformation of the process fluid conduit in response to process fluid pressure therein. A gap measurement system is coupled to the measurement bracket and provides an electrical signal based on a measurement of the variable gap. A controller is coupled to the gap measurement system and is configured to calculate and provide a process fluid pressure output based on the electrical signal and information relative to the process fluid conduit.

A pressure sensor is provided with a cylindrical body made of a magnetostrictive material and configured to be deformed under a pressure of a fluid flowing inside and a detection portion configured to detect a change in magnetic field caused by distortion of the cylindrical body. The cylindrical body is provided with a peripheral wall portion curved or bent in an axial direction of the cylindrical body.

An apparatus for determining fluid pressure within flexible tubing has a magnet and a multidimensional magnetic sensor arranged to detect a magnetic field of the magnet along at least two dimensions. The magnetic sensor and the magnet are arranged such that a location of the magnet relative to the magnetic sensor varies as a function of the fluid pressure within the tubing, and a direction of a magnetic field vector at the magnetic sensor is dependent upon the location of the magnet relative to the magnetic sensor. The magnetic sensor detects at least two magnetic field strengths corresponding to strength of the magnetic field projected along each of the at least two dimensions, and generates an output signal related to the direction of the magnetic field vector at the magnetic sensor. The direction of the magnetic field vector is used as an indicator of the fluid pressure.

A system for generating an electrical signal responsive to a pressure input, a sensory system, and a method for generating an electrical signal responsive to a pressure input. The system comprises a diaphragm configured to be subjected to the pressure input; a microfluidic channel with a first end thereof coupled to the diaphragm such that the pressure input generates a corresponding pressure change in the microfluidic channel; one or more magnets disposed in a carrier liquid in the microfluidic channel; and one or more coils disposed along the microfluidic channel and for generating the electrical signal based on Faraday effect by the magnets moving, under the pressure change in the microfluidic channel, through the respective coils.

A pressure sensor is provided with a cylindrical body made of a magnetostrictive material and configured to be deformed under a pressure of a fluid flowing inside and a detection portion configured to detect a change in magnetic field caused by distortion of the cylindrical body. The cylindrical body is provided with a peripheral wall portion curved or bent in an axial direction of the cylindrical body.

A method of detecting presence or absence of a magnetic measurement probe at a measurement launch position in an electromagnetic coil of an ophthalmic instrument includes applying a temporary current pulse to the electromagnetic coil, detecting a counter-electromotive force voltage spike induced in the electromagnetic coil by the current pulse, evaluating a decay behavior of the counter-electromotive force voltage spike, and correlating the decay behavior of the counter-electromotive force voltage spike to presence or absence of the measurement probe at the measurement launch position.