WHAT IS GEOPHONE?

Posted by Ammu Surendran on September 5th, 2019

The seismic wavefield is measured by geophones or hydrophones. The output is electrical signals. The data from the geophones are initially amplified at the preamplifier which is the voltage. It is then passed through an analog low-cut filter. The data are filtered by the analog high-cut filter so that frequencies above Nyquist are removed and then amplified again. Geophones are remarkably simple devices, unlike what you might think.

The active element of the device consists of a mass hanging on a spring, like gravity meters. The mass wants to remain motionless when the ground moves. Geophone has been used by geophysicists and seismologists to convert ground movement into voltage. It is a ground motion transducer. The Seismic response is any deviation in this measured voltage from the baseline. It is used for analyzing the earth’s structure.

The key factor in a geophone is Resonance frequency. Resonance frequency has to be low for the measurement of low-frequency signals. To measure high-frequency signals, Geophone must exhibit high bandwidth. Currently available geophones include mechanical springs, which decrease the performance of the device. Feeding back the output of geophone will vary the geophone’s sensitivity with respect to its frequency. By controlling the position of proof mass, the resolution of geophone can be enhanced.

To achieve a high level of accuracy and precision, geophones are used for several industrial applications for vibration isolation purposes and absolute velocity sensing. Geophone technology is employed to measure absolute velocity for lithographic and high-level inspection applications to determine payload disturbances caused by moving parts and other external disturbances. Major applications of geophones are the detection of leakage in gas and oil fields and earthquake prediction.

The geophones currently available in the market are highly sophisticated, and they operate based on the magnetic field generated by a coil suspended in a magnetic field. The current seismic industry market requires tight specifications to meet the standards of the seismic survey. Cable and Supplies, Inc. is one of the best suppliers of high-performance geophones, cables, seismic connectors, industrial sensors, earthquake seismometer, detectors, vibration detectors, border security products. Cable & Supplies, Inc. has supplied geophysical, vibration and security products worldwide. Cable & Supplies is able to guarantee a very high level of satisfaction for our clients, with a long list of products and never-ending customer support. We offer the highest standard of services with the latest technology, equipment.

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