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Geophone

A geophone is an instrument used to transform seismic energy into an electrical voltage by responding to the velocity of a seismic wave. Geophones that detect the reflected seismic signals are generally electromagnetic devices that contain at least one coil representing the electric circuit and at least one magnet which cooperates with the coil. In seismic exploration, the vibrations in the earth resulting from a source of seismic energy are sensed at discrete locations by sensors and the output of the sensors used to determine the nature of the underground formations. Geophones have been used to detect different types of generated seismic signals during seismic exploration of earth strata. The most common type is the so-called compressional (P) wave in which the earth particle motion is in the same direction as the wave propagation. Compressional waves are the signals most commonly used for seismic exploration. Geophones are devices which sense motion by suspending an inertial reference mass structure from a rigid, fixed supporting structure. Geophones for the detection of seismic signals generally comprise electromagnetic devices comprising at least a coil, representing the electric circuit, and at least a magnet interacting with the coil. In geophones, both ends of the electrical path have to be electrically insulated from each other and the outside case of the geophone. Geophones are used for seismic exploration both on land and under water. They are contained in a case that contacts the surface of the earth and usually connects to electrical cables.

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Geophone product listings

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