Tuned vibration detector
First Claim
1. A vibration sensor for detecting vibrations having preselected frequencies, comprising:
- a. a plurality of tuning means each being mechanically resonant with a different preselected vibrational frequency to be detected, and each comprising a frame having a least one mechanical resonant frequency and having at least one cantilevered element extending therefrom;
b. a plurality of positive magnetostriction glassy metal elements, each connected to a different one of said cantilevered elements to undergo a varying tensile stress in response to vibrational movements of said cantilevered elements, and each connected to said different one of said cantilevered elements with a tensile prestress applied to the glass metal element;
c. magnetic biasing means for imparting magnetization to said magnetostrictive elements; and
d. means associated with said magnetostrictive elements for detecting changes in the magnetization thereof due to the varying stresses applied thereto.
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Accused Products
Abstract
This invention provides a vibration sensor for detecting vibrations having preselected frequencies. The sensor has a plurality of tuning mechanisms each being mechanically resonant with a different preselected vibrational frequency. The resonating vibrational movements of these tuning mechanisms apply varying stresses to a plurality of glassy magnetostrictive elements associated therewith. Each of the magnetostrictive elements is responsive to a different one of the tuning mechanisms. A magnetic biasing element imparts a magnetization to the magnetostrictive elements and a detecting mechanism associated with the magnetostrictive elements detects changes in the magnetization thereof caused by the varying stresses applied thereto.
116 Citations
22 Claims
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1. A vibration sensor for detecting vibrations having preselected frequencies, comprising:
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a. a plurality of tuning means each being mechanically resonant with a different preselected vibrational frequency to be detected, and each comprising a frame having a least one mechanical resonant frequency and having at least one cantilevered element extending therefrom; b. a plurality of positive magnetostriction glassy metal elements, each connected to a different one of said cantilevered elements to undergo a varying tensile stress in response to vibrational movements of said cantilevered elements, and each connected to said different one of said cantilevered elements with a tensile prestress applied to the glass metal element; c. magnetic biasing means for imparting magnetization to said magnetostrictive elements; and d. means associated with said magnetostrictive elements for detecting changes in the magnetization thereof due to the varying stresses applied thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A vibration sensor adapted for use with a rolling element bearing to detect vibrations due to bearing
a. a base adapted for mounting to apparatus comprising said bearing; -
b. a frame connected to said base and having a plurality of cantilevered elements extending therefrom, said frame being mechanically resonant with said vibrations at a plurality of frequencies; c. a plurality of frequency adjusting means, each being connected to a different one of said cantilevered elements for varying the resonant frequencies of said frame; d. a plurality of magnetostricutive elements of positive magnetostriction material, each connected to a different one of said cantilevered elements with a tensile prestress applied thereto and each connected to said cantilevered elements to undergo varying tensile stresses in response to resonating movement of said cantilevered elements; e. a magnet associated with said magnetostrictive elements to impart a magnetization thereto; and f. a coil of electrically conductive material located in proximity to said magnetostrictive element for detecting changes in the magnetization thereof caused by variations of said tensile stresses. - View Dependent Claims (21, 22)
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Specification