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US 2012/0059604 A1Published application
Contactless vibration meter
OwnerGeeng-Jen Sheu, Shih-Hung Yehinventors
Life of this patent
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Abstract
A contactless vibration meter having a magnetic strip, a detector, and a processor is disclosed. The N-pole blocks of the magnetic strip are unequal lengths and the S-pole blocks of the magnetic strip are also unequal lengths, the detector is detecting the N-pole blocks of the magnetic strip with unequal lengths and the S-pole blocks of the magnetic strip with unequal lengths, and the voltage variation due to the change of the magnetoresistance of the detector is calculated by the processor, so as to transfer to corresponding vibrating waveform, thereby being capable of obtaining the vibrating information of the tested object. It is not limited by the space of the factory or the pattern of the tested object, and capable of being attached to detect immediately.
Claims10
A contactless vibration meter, comprising:
- a magnetic strip, attached on a surface of a tested object and being parallel to the vibrating direction, the magnetic strip having a first section, a second section and a central section, wherein the central section has a magnetic pole with N pole or S pole, the first section and the second section are connected to two ends of the central section respectively, the first section includes at least two first N-pole blocks and at least two first S-pole blocks, the first N-pole blocks and the first S-pole blocks are alternatively arranged from the end of the first section close to the central section and a length of the first N-pole blocks and a length of the first S-pole blocks increase with increase the distance from the central section, and the second section includes at least two second N-pole blocks and at least two second S-pole blocks, the second N-pole blocks and the second S-pole blocks are alternatively arranged from the end of the second section close to the central section and a length of the second N-pole blocks and a length of the second S-pole blocks increase with increase the distance from the central section, and the first section and the second section are connected to the central section with N-pole or S-pole blocks thereof respectively which is opposite to the magnetic pole of the central section;
- a detector, attached at a position over the magnetic strip and including a fixed magnetic layer with a fixed magnetic direction, a free magnetic layer with a changeable magnetic direction influenced by an external magnetic field, an insulating layer separated the fixed magnetic layer from the free magnetic layer, two signal lines electrically connected to the fixed magnetic layer and the free magnetic layer respectively, and a power supply electrically connected to the signal lines;
- and
- a processor, electrically connected to the signal lines;
- wherein the magnetic strip is passed through the detector in reciprocating motion when the tested object vibrates periodically in reciprocating motion, the changeable magnetic direction of the free magnetic layer is influenced by the magnetic fields of the respective N-pole blocks and the respective S-pole blocks of the first section and the second section to make the magnetic direction of the free magnetic layer be parallel or anti-parallel to the magnetic direction of the fixed magnetic layer;
- and result in obvious change of the magnetoresistance of the detector and a voltage or current output to the processor, and then the processor calculates the vibration information of the tested object.
3 more elements
A contactless vibration meter, comprising:
- a first magnetic strip, attached on a surface of a tested object and being parallel to the vibrating direction, the first magnetic strip having a first section, a second section and a central section, wherein the central section has a magnetic pole with N pole or S pole, the first section and the second section are connected to two ends of the central section respectively, the first section includes at least two first N-pole blocks and at least two first S-pole blocks, the first N-pole blocks and the first S-pole blocks are alternatively arranged from the end of the first section close to the central section and a length of the first N-pole blocks and a length of the first S-pole blocks increase with increase the distance from the central section, and the second section includes at least two second N-pole blocks and at least two second S-pole blocks, the second N-pole blocks and the second S-pole blocks are alternatively arranged from the end of the second section close to the central section and a length of the second N-pole blocks and a length of the second S-pole blocks increase with increase the distance from the central section, and the first section and the second section are connected to the central section with N-pole or S-pole blocks thereof respectively which is opposite to the magnetic pole of the central section;
- a second magnetic strip, being adjacent to the first magnetic strip and having at least two third N-pole blocks and at least two third S-pole blocks, the third N-pole blocks and the third S-pole blocks have the same length and are alternatively arranged;
- a first detector, disposed corresponding to the first magnetic strip to detecting a variation of a changeable magnetic direction of each first and second N-pole block and each first and second S-pole block;
- a second detector, disposed corresponding to the second magnetic strip to detecting a variation of a changeable magnetic direction of each third N-pole block and each third S-pole block;
- and
- a processor, electrically connecting with the first detector and the second detector;
- wherein the processor receives the variations of the changeable magnetic directions detected by the first detector and the second detector to result in obvious change of a magnetoresistance of the first detector and the second detector respectively, and a voltage or current output to the processor, and then the processor integrally calculates a vibration information of the tested object.
4 more elements
Dependencies are inferred from the claim text.