Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1978-05-01
1980-02-12
Blum, Theodore M.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
310329, G01V 116
Patent
active
041886127
ABSTRACT:
A short period seismometer sealed in a housing with an oil-immersed frame supporting a mass suspended for displacement along an axis of sensitivity of the instrument, one end of the mass being merely guided and constrained for axial movement, and the other end of the mass being supported by a spring disc assembly clamped in the frame at its periphery and attached to the mass at its center, the disc assembly including a piezoelectric disc bonded to a spring metal disc on the opposite face thereof from the mass and the piezoelectric disc having a diameter about 0.68 times the diameter of the spring metal disc to achieve optimum output signal, the mass restoring force being concentrated in the spring disc assembly, and the constraining guide at the other end of the mass contributing only insignificantly to the restoring force.
REFERENCES:
patent: 2411401 (1946-11-01), Welch
patent: 2873604 (1959-02-01), Samsel
patent: 3187300 (1965-06-01), Brate
patent: 3638052 (1972-01-01), Massa
patent: 3688251 (1972-08-01), Morris
patent: 3707131 (1972-12-01), Massa
patent: 3849679 (1974-11-01), Massa
patent: 3911388 (1975-10-01), Crump et al.
Blum Theodore M.
Teledyne Industries Inc. (Geotech Division)
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