Effect of electrical noise on low frequency extension range of geophone
Liao Fei-hong · Modern Machinery · 2011
Series correction method is widely used in low frequency extension of geophone to make the sensor to measure low frequency or ultra-low frequency vibration accurately.And electrical noise is the key influence factor which determines the low frequency extension range.This article establishes a multi-input single-output measurement model of geophone including measurement,amplification,transportation and series correction,and analyzes the relationship between electrical noise and low frequency extension range of geophone.The conclusion shows that the primary electrical noise is the key influence factor and the secondary noise has less influence which depends on the magnitude ratio of the secondary noise,primary noise and its amplification.This method is easy to decide the low frequency extension range of geophone if the electrical noise is given,and can be used to decide geophone specification and in low frequency vibration measurement.