Sensitive differential pressure sensor and method

A differential pressure sensor, sensor technology, used in instruments, measuring fluid pressure, piston-type fluid pressure measurement, etc., can solve the problems of high cost and not fully suitable for measuring low differential pressure.

Inactive Publication Date: 2012-07-04
SONDEX
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  • Abstract
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Problems solved by technology

[0004] However, such conventional pressure sensing technologies are not well suited for measuring low differential pressures, are costly, and may be difficult to operate in environments requiring high withstand pressures

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  • Sensitive differential pressure sensor and method
  • Sensitive differential pressure sensor and method
  • Sensitive differential pressure sensor and method

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Embodiment Construction

[0011] The following detailed description of the exemplary embodiments refers to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. Furthermore, the following detailed description is not intended to limit the invention. Rather, the scope of the invention is defined by the appended claims.

[0012] Figure 1A -C shows a cross-sectional view of the differential pressure sensor 100 according to an embodiment of the present invention. Various embodiments disclosed herein relate to differential pressure transducers that use one or more permanently magnetized moving pistons contained in a barrel and stationary magnets sealed into the end of the barrel. The barrel can be made of a material that has low magnetic permeability, is transparent to the magnetic flux lines, but is able to withstand the measured pressure. The movable piston 101 is sealed into the barrel 103 using a ferrofluid 105 that provides an extremely lo...

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Abstract

A differential pressure sensor has a magnetized piston free to move in a cylinder. Magnetic endcaps seal the ends of the cylinder, forming chambers on either side of the piston. The moveable magnetic piston is constrained by the opposing magnetic fields of the endcaps. The piston is covered with magnetic ferrofluid, providing a low friction gas-tight seal around the piston. The cylinder has two pressure input lines, one being connected to the chamber on either side of the piston. The relative pressures of the input lines cause the piston to move to a position of equilibrium within the cylinder, with the magnetic fields of the endcaps holding the piston in place against the pressure. A magnetic field angle sensor detects flux lines on the outside of the cylinder, and the reading is correlated with the pressure differential between the two input lines.

Description

technical field [0001] Various embodiments of the invention relate to sensors and measurement devices, and more particularly, to pressure sensors. Background technique [0002] There are many different pressure-related parameters that can be measured. Absolute pressure sensors measure pressure relative to a full vacuum of 0 pounds per square inch (PSI), or zero pressure. Atmospheric pressure is 101.325kPa (14.7PSI) with reference to vacuum at sea level. Pressure measurements taken on car tires are sometimes called gauge pressures. Gauge pressure sensors measure the pressure relative to a given atmospheric pressure at the measuring location. For example, when the tire pressure gauge reads OPSI, there is actually approximately 14.7 PSI (or atmospheric pressure) in the tire. A third type of pressure measurement is differential pressure. A differential pressure sensor measures the difference between two pressure inputs to a sensing device. For example, a differential press...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L13/06
CPCG01L9/0089G01L7/16G01L13/06G01L9/14
Inventor K·R·伍滕
Owner SONDEX
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