Question

Can we develop a correction for drift that occurs in collecting data via instrumentation? Explain.

Answer 1

Ans: In geophysics, gravity method data collecting in the site gravity values varies with respect to time it is one example.

Correction for instrumental drift is based on repeated readings at a base station at recorded times throughout the day. The meter reading is plotted against time and drift is assumed to be linear between consecutive base readings. The drift correction at time, which is subtracted from the observed value. After drift correction the difference in gravity between an observation point and the base is found by multiplication of the difference in meter reading by the calibration factor of the gravimeter. Knowing this difference in gravity, the absolute gravity at the observation point can be computed from the known value of gravity at the base.