Micro-Magnetic Sensor for Acceleration, Position, Tilt, and Vibration
OwnerXu Hua Jianginventor
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Abstract
A micro-magnetic based sensor and a system built with it for detecting or measuring acceleration, speed, position, placement, tilt, and vibration are disclosed for a reduced product size, simplified manufacturing process, and reduced product cost. Both micro-magnetic sensor and micro-magnetic system include a primary micro inductor and a secondary micro inductor coupled with a micro magnetically permeable dynamic medium element that is small, simple and low cost to manufacture.
Claims12
A micro magnetic sensor (MMS) for acceleration, position, tilt, and vibration comprising:
- a primary winding and a secondary winding wherein the primary winding has two primary input terminals and the secondary winding is wound with two secondary differential output terminals SDOT-1 and SDOT-2;
- and
- a magnetically permeable dynamic media element (MPDME) placed near both the primary winding and the secondary winding so as to effect a transformer coupling there between in that, upon connecting the primary input terminals to an external single frequency drive signal source, a phase-based differential output signal PDOS is generated between SDOT-1 and SDOT-2 and, upon a movement of the MPDME due to acceleration, position, tilt or vibration, the MPDME causes a corresponding response of the PDOS.
A multi-axis micro magnetic sensor (MA-MMS) for simultaneously sensing acceleration, position, tilt, and vibration along a plurality of directions respectively parallel to axes A1, A2, . . . , Aj, . . . , AN with N>1, the MA-MMS comprises N micro magnetic sensors (MMSj, j=1, 2, . . . , N) for respectively sensing acceleration, position, tilt, and vibration along axes A1, . . . , AN, wherein each MMSj comprises:
- a sealed nonmetallic coil tube oriented parallel to axis Aj;
- a composite sensor core, disposed inside the coil tube for a free sliding movement along axis Aj under an inertial force, made of two magnetically permeable end elements MPEE-A and MPEE-B bonded together via an intervening interface element (IIE), said MPEE-A and MPEE-B having matched geometry and magnetic permeability of a first magnetic permeability value MP-AB whereas said IIE having a second magnetic permeability MP-C unequal to MP-AB;
- and
- a primary winding and a secondary winding both enclosing the coil tube for a transformer coupling there between, wherein the primary winding has two primary input terminals and the secondary winding is wound with two secondary differential output terminals SDOT-1 and SDOT-2 such that:
- upon connecting the set of primary input terminals from (MMS1, . . . , MMSN) to a common external single frequency drive signal source, the MA-MMS simultaneously generates a corresponding set of phase-based differential output signals (PDOSj, j=1, 2, . . . N) with each PDOSj developed between SDOT-1 and SDOT-2 of MMSj, responsive to the acceleration, position, tilt, and vibration of the set of composite sensor cores of the MA-MMS.
A digital micro magnetic sensor system (DMMSS) for sensing acceleration, position, tilt, and vibration, the DMMSS comprising:
- a micro magnetic sensor head (MMSH) comprising:
- a micro magnetic sensor for acceleration, position, tilt, and vibration (MMS) comprising:
- a sealed nonmetallic coil tube;
- a composite sensor core, disposed inside the coil tube for a free sliding movement along its axis under an inertial force, made of two magnetically permeable end elements MPEE-A and MPEE-B bonded together via an intervening interface element (IIE), said MPEE-A and MPEE-B having matched geometry and magnetic permeability of a first magnetic permeability value MP-AB whereas said IIE having a second magnetic permeability MP-C unequal to MP-AB;
- and
- a primary winding and a secondary winding both enclosing the coil tube for a transformer coupling there between, wherein the primary winding has two primary input terminals and the secondary winding is wound with two secondary differential output terminals SDOT-1 and SDOT-2;
- and
- a serially connected bridge circuit (BGC) and signal amplifier (SGA) with the input terminals of BGC connected to the SDOT-1 and SDOT-2;
- and
- a mixed signal post-processor (MSPP) comprising:
- a serially connected analog signal filter (ASF), analog-to-digital converter (ADC) and digital signal processor (DSP) with the ASF input connected to the SGA output such that:
- upon connecting the primary input terminals to an external single frequency drive signal source, the DMMSS generates, through the DSP, a digital sensor output signal (DSOS) representing the acceleration, position, tilt, and vibration of the composite sensor core.
Dependencies are inferred from the claim text.