Amplifier and Filter for Geophone Sensitivity Studies

A geophone is a device that response to the velocity of the ground by the movement
of the magnetic mass back and forth to produce a voltage. Generally, geophone can
measures a various frequencies of seismic events but there is a limit of frequency that
frequencies should be over to get an accurate measurement. The limit is also resonant
frequency which is usually in range 4.5Hz to 10Hz depending on the seismic sensor
type. If the frequencies detected is below the geophone’s resonant frequency,
geophone encounter inaccuracy in detecting the motion. By utilizing a feedback and
filter circuits, the sensor can measures even the low frequencies. This will be assessed
with a shaking table that is set to a certain frequencies and the measurement of the
output can be taken. The aftereffect of the geophone connected with the filter circuits
connected to an oscilloscope will be contrasted with the outcomes of the geophone
using current geophone circuit. The project of building of the circuit is to enhance the
sensitivity of the geophone in detecting lower frequency below resonant frequency.