Alternating magnetic field sensing device

• US 9,606,192 B2
• Filed: 04/16/2013
• Issued: 03/28/2017
• Est. Priority Date: 06/04/2012
• Status: Active Grant

• Current Assignee: Nationz Technologies Inc.
• Original Assignee: Nationz Technologies Inc.
• Inventors: Huang, Zhen
• Primary Examiner(s): LE, SON T
• Application Number:
  US14/405,591
• Publication Number:
  US 20150192645A1
• Time in Patent Office: 1,442 Days
• US Class Current: 1/1
• CPC Class Codes: G01R 33/0286 comprising microelectromechanical systems [MEMS] MEMS devices in general B81B
• CPC Class Codes: G01R 33/0385 in relation with magnetic force measurements magnetic force microscopes G01Q60/50

Abstract

An alternating magnetic field sensing device comprises at least one magnet and at least one force-electricity converting module. The magnet is mechanically connected to the force-electricity converting module and converts a magnetic signal received in an alternating magnetic field to mechanical force and transmits the mechanical force to the force-electricity converting module. The force-electricity converting module converts the mechanical force provided by the magnet to an electrical signal.

Claims

1. An alternating magnetic field sensing device, comprising:

at least one magnet and at least one force-electricity converting module;

wherein

the magnet is mechanically connected to the force-electricity converting module, the magnet converting a magnetic signal received in an alternating magnetic field to mechanical force and transmitting the mechanical force to the force-electricity converting module;

the force-electricity converting module converts the mechanical force provided by the magnet to an electrical signal; and

a nonmagnetic counterweight for converting a change of acceleration, vibration, and direction of gravity to mechanical force and providing the mechanical force to the force-electricity converting module.

2. The alternating magnetic field sensing device of claim 1, further comprising:

a processing module connected to at least two force-electricity converting modules, the processing module receiving the electrical signals from the at least two force-electricity converting modules and performing comparison and calculation to obtain an interference signal.

3. The alternating magnetic field sensing device of claim 2, wherein the interference signal comprises vibration interference, gravity interference, and acceleration interference.

4. The alternating magnetic field sensing device of claim 1, wherein the at least one magnet is a permanent magnet or an electromagnet.

5. The alternating magnetic field sensing device of claim 4, wherein the alternating magnetic field sensing device changes sensitivity by the electromagnet adjusting an exciting current.

6. The alternating magnetic field sensing device of claim 1, wherein the force-electricity converting module is one of a piezoelectric device, a resistance strain device, a capacitive sensor, a photoelectric sensor, an optical fiber strain sensor, a semiconductor strain gauge sensor, a sapphire pressure sensor, or a micro-electro-mechanical pressure or stress sensor.

7. The alternating magnetic field sensing device of claim 6, wherein a material of the piezoelectric device comprises at least one of:

a ceramic material;

a piezoelectric single crystal;

polycrystalline piezoelectric ceramic;

polyvinylidene fluoride (PVDF);

single crystal silicon, polycrystalline silicon;

or

a film material.

8. The alternating magnetic field sensing device of claim 7, wherein the ceramic material comprises barium titanate ceramic, the piezoelectric single crystal comprises at least one of quartz, tourmaline, rochelle salts, tantalite, or niobate, and the film material comprises a zinc oxide film.

9. The alternating magnetic field sensing device according to claim 1, further comprising:

brackets; and

a housing provided outside the brackets, wherein both the force-electricity converting module and the magnet are provided inside the housing, the force-electricity converting module fixed between the brackets and including a first electrode and a second electrode.