Tuned vibration detector

Details Tuned vibration detector Tuned vibration detector

1982-02-18

1984-08-07

Gill, James J.

Measuring and testing

Vibration

Sensing apparatus

73 35, 73651, G01L 2322, G01H 100

Patent

active

044636105

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.

REFERENCES:
patent: 2424864 (1947-07-01), Treseder
patent: 4096735 (1978-06-01), Huntzinger et al.
patent: 4161665 (1979-07-01), Buck et al.
patent: 4254354 (1981-03-01), Keem
patent: 4307602 (1981-12-01), Sawada et al.
patent: 4383434 (1983-05-01), Hamisch et al.
"Force and Displacement Transducers . . . ", by Mohri et al. from Electrical Engineering in Japan, vol. 99, No. 2, Jan.-Feb. 1979, pp. 105-112.

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