Tuned vibration detector
First Claim
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1. A vibration sensor to detect vibrations having a preselected frequency comprising:
- a. tuning means mechanically resonant with a preselected vibrational frequency to be detected, said tuning means comprising a frame having at least one mechanical resonant frequency and having at least one cantilevered element extending therefrom;
b. a element of positive magnetostriction glassy metal, which is connected substantially perpendicular to said cantilevered element to undergo a varying tensile stress in response to vibrational movements of said cantilevered element and which is connected to said cantilevered element with a tensile prestress applied thereto;
c. magnetic biasing means for imparting a magnetization to said magnetostrictive element; and
d. means associated with said magnetostrictive element for detecting changes in the magnetization thereof due to the varying stress applied thereto.
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Abstract
This invention comprises a vibration sensor for detecting engine knock. The sensor has a tuning mechanism which is mechanically resonant with a preselected vibrational frequency. The resonating movements of this tuning mechanism are adapted to apply varying stress to an associated magnetostrictive element. A magnetic biasing element imparts a magnetization to the magnetostrictive element and a detecting means is associated with the magnetostrictive element for detecting changes in the magnetization caused by the varying applied stress.
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Citations
19 Claims
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1. A vibration sensor to detect vibrations having a preselected frequency comprising:
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a. tuning means mechanically resonant with a preselected vibrational frequency to be detected, said tuning means comprising a frame having at least one mechanical resonant frequency and having at least one cantilevered element extending therefrom; b. a element of positive magnetostriction glassy metal, which is connected substantially perpendicular to said cantilevered element to undergo a varying tensile stress in response to vibrational movements of said cantilevered element and which is connected to said cantilevered element with a tensile prestress applied thereto; c. magnetic biasing means for imparting a magnetization to said magnetostrictive element; and d. means associated with said magnetostrictive element for detecting changes in the magnetization thereof due to the varying stress applied thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vibration sensor to detect vibrations having a preselected frequency comprising:
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a. tuning means mechanically resonant with a preselected vibration frequency to be detected, said tuning means comprising a frame having at least one mechanical resonant frequency and two cantilevered elements extending therefrom; b. a glassy metal magnetostrictive element connected between said cantilevered elements to undergo varying stress applied thereto by vibrational movements of said cantilevered elements; c. magnetic biasing means for imparting a magnetization to said magnetostrictive element; and d. means associated with said magnetostrictive element for detecting changes in the magnetization thereof due to the varying stress, applied thereto. - View Dependent Claims (15, 16, 17, 18)
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19. A vibration sensor adapted for use with an internal combustion engine to detect vibrations due to engine knock, comprising:
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a. a base adapted for mounting to an internal combustion engine; b. a frame connected to said base and having two cantilevered element extending therefrom, said frame being mechanically resonant with said vibrations; c. a frequency adjusting means connected to said cantilevered element for varying the resonant frequency of said frame. d. a glassy metal element of positive magnetostriction material interconnected between said cantilevered elements and substantially perpendicular thereto to undergo varying tensile stress in response to resonating movements of said cantilevered elements; e. a magnet associated with said magnetostrictive element 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 therof caused by variations of said tensile stress.
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Specification