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 seismic refraction survey included 13 SRT profiles (with Daqlink seismograph and 24 4.5 Hz geophones) with a total length of 4210 meters (8 profiles on Site 1 and 5 profiles on Site 2; see Figure 8).
A total of nine geophones, numbered #1-9 in Figure la, were installed underground in the mine: #1-8 were installed in longwall Face 5301, while #9 was located in a bedrock borehole to satisfy the D-value optimization criteria (Li et al., 2017).
In the open loop (passive) state, the time domain signal of the payload platform acquired by the geophone is approximate to [+ or -] 49 [micro]m/s in Figure 20 and Table 3.
In combination with the Sercel SG-5, a high-sensitivity 5-Hz single-sensor geophone, UNITE offers NIS a superior, light, efficient and flexible solution for the most complex environments.
He used a rather unique piece of equipment called a 'geophone,' and this was used like a stethoscope that he would put in his ears and attach to this instrument.
Norton-Griffiths gave his men something their German counterparts didn't have - a geophone: a stethoscope-type tool that allowed them to hear enemy Claykickers from 100 feet away in clay and 260 feet in chalk.
One seismic channel consisted of the RAU-ex (Sercel) seismic recorder and a single high-sensitivity geophone GS-One (Geospace Technologies) per group.
For example, Shell is working to develop a wireless micro-electromechanical geophone system that can be scaled up to one million channels.