Geophone


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geophone

[′jē·ə‚fōn]
(electronics)
A transducer, used in seismic work, that responds to motion of the ground at a location on or below the surface of the earth.

Geophone

 

a receiver for sound waves that propagate through the upper layers of the earth’s crust. It consists of a housing containing a heavy weight mounted elastically between two thin, flexible metallic plates. The acoustic vibrations that are propagating through the ground cause the housing—which is in contact with the ground—to move whereas the heavy weight, because of its inertia, remains motionless.

In earlier geophone designs the inert mass was attached to a diaphragm that divided the inside of the housing into two sections; the displacements of the diaphragm relative to the housing produced alternate compressions and rarefactions on both sides that were transmitted through tubes to the ears of the observer. Modern geophones (prospecting seismographs) are equipped with electromechanical transducers (which convert ground vibrations into electrical current oscillations), an amplifier, and a recording loop oscillograph. They are used in acoustic prospecting for minerals, in military actions to listen to sappers’ operations, and in mine rescue operations. Geophones that function on the vibrograph principle are frequently used. Geophones using a piezoelectric quartz crystal as the basic element to detect acoustic waves of a specific length are called piezogeophones.

References in periodicals archive ?
The geophone assemblies at a fixed separation are used so that interval velocities can be determined from the same set of impulses.
The domain was divided into rectangular blocks or cells having a lateral extension generally half the distance between geophones and depth was defined by the interpreter.
One result of this activity was the 1990s development of digital geophone systems by a subsidiary of OMEGA Netherlands, to augment the analog geophone product line.
Equipped with amplifiers, speakers, geophones, and video cameras, the research team spent a full month performing round-the-clock tests designed to see how elephant herds respond when specific calls are played back through the ground.
Both of this devices had similar loading plate (300 mm) and geophone spacing (0, 200, and 400 mm), but their drop weight were different.
A geophone with vertical polarization (Geospace industries, model GS 20-DX, damping resistor = 1000 ohms) was used to collect substratum-coupled vibratory signals.
In well bore seismic data acquisition at each depth, the interval velocity of the formation between the source and the bore hole geophone is measured.
New DOTS Geophone Plus 2 is the most accurate, up-to-date phone number validation service available
The company is completing installation of more than 325 square miles or more than 208,000 acres of buried arrays in the Haynesville, Marcellus, and Bakken shale basins, consisting of more than 3,100 geophone channels.
ESG installed a 12-level, retrievable three-component geophone array to continuously record seismicity in a zone affected by high volume water inflow.