Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent
1990-05-14
1991-03-19
Steinberger, Brian
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
181122, 73649, 33 1HH, 33398, H04R 1500
Patent
active
050016822
ABSTRACT:
A seismographic sensor is constructed from a D'Arsonval movement. The elements of the movement include a coil suspended in the field of a permanent magnet and a pointer attached to the coil. A weight is attached to the pointer and acts as an inertia element. Leveling screws are provided to control the period of the weighted pointer and to control the resting position of the pointer. When the base of the meter vibrates during an earthquake, the weighted pointer does not follow the vibration because of its inertia, resulting in a relative rotation of the meter coil and the magnet field, thereby inducing a voltage in the coil. This voltage is proportional to one component of horizontal velocity of the earth's motion. Means are provided to process and record the magnitude of this voltage.
REFERENCES:
patent: 2272984 (1942-02-01), Ritzmann
patent: 3026428 (1962-03-01), French
patent: 3181065 (1965-02-01), Bajars
Markus Bath, "Introduction to Seismology", 2nd Ed., 1979 published by Birkhauser Verlag, Vasel, Boston, Stuttgart, Chapter 2, Seismographs, pp. 29-60.
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