Tuned vibration detector

Details Tuned vibration detector Tuned vibration detector

1982-09-23

1984-10-30

Gill, James J.

Measuring and testing

Vibration

Sensing apparatus

73654, 73593, G01H 100

Patent

active

044793898

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.

REFERENCES:
patent: 4041775 (1977-08-01), McNamee
patent: 4254354 (1981-03-01), Keem
patent: 4341189 (1982-07-01), Yamaguchi et al.
patent: 4357825 (1982-11-01), Yamaguchi et al.
"Force and Displacement Transducers . . . " by Mohri et al. from _Electrical Engineering in Japan, vol. 99, No. 2, pp. 105-112, _Jan.-Feb., 1979.

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