US 10,502,586 B2Granted

Inductive transducer shielding method

AssigneeShanghai Lanbao Sensing Technology Co., Ltd.

InventorsYong Xle, Chunhua Jiang

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Abstract

A method for shielding an inductive sensor includes arranging an annular shielding coil outside an annular detection coil, the shielding coil surrounds the detection coil, and the radial thickness of the shielding coil is smaller than that of the detection coil. An inductive sensor adopting the above method for shielding the inductive sensor, in which the shielding coil is arranged outside the detection coil of the inductive sensor, magnetic fields generated by the two coils are opposite in direction and partially cancel out each other. When interference exists, the magnetic fields generated by the two coils are influenced at the same time and are attenuated or increased by identical strength. Therefore, the summed magnetic field strength can be kept constant, resonance voltages cannot be attenuated, the interference rejection of the inductive sensor is improved, and the sensitivity of the inductive sensor is not influenced.

Claims6

Dependent claims

A method for shielding an inductive sensor, comprising:

arranging an annular shielding coil outside each of two annular detection coils, arranged adjacently in an axial direction of the inductive sensor, such that the annular shielding coil surrounds the each of the two annular detection coils, wherein the two annular detection coils are each connected in series with a resonant capacitor to form two resonant circuits that have an identical resonant frequency, and wherein a radial thickness of the annular shielding coil is smaller than a radial thickness of the each of the two annular detection coils, and a magnetic field generated by the annular shielding coil and a magnetic field generated by the each of the two annular detection coils are opposite in directions such that they partially cancel out each other, and the magnetic field generated by the annular shielding coil and the magnetic field generated by the each of the two annular detection coils are decreased or increased at the same time, such that a sum of a strength of the magnetic field generated by the annular shielding coil and a strength of the magnetic field generated by the each of the two annular detection coils is kept constant.

Dependencies are inferred from the claim text.

Facts

Application: 15/551,903Filed 11 Sep 2015
Priority: CN 2014 1 047473217 Sep 2014
Published: US 2018/0252551 A16 Sep 2018
Granted: 10 Dec 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01D 3/036
Mitigating undesired influences, e.g. temperature, pressure: on measuring arrangements themselves
H03K 17/9502
Using a magnetic detector: measures for increasing reliability
G01D 3/028
Indicating or recording apparatus with provision for the special purposes referred to in the subgroups: mitigating undesired influences, e.g.…
G01D 5/20
Influencing the magnitude of a current or voltage: by varying inductance, e.g. by a movable armature