Tuned vibration detector
AssigneeAllied Corporation
InventorsPhilip M. Anderson, III, Donald Raskin, Ronald K. Reich
Life of this patent
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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.
Claims19
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.
A vibration sensor to detect vibrations having a preselected frequency comprising:
- 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.
A vibration sensor adapted for use with an internal combustion engine to detect vibrations due to engine knock, comprising:
- 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.
Dependencies are inferred from the claim text.