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IMPROVED PHASE‐ELLIPSE METHOD FOR IN SITU GEOPHONE CALIBRATION *
Author(s) -
LIU H.P.,
PESELNICK L.
Publication year - 1986
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1986.tb00480.x
Subject(s) - geophone , calibration , ellipse , sensitivity (control systems) , phase (matter) , amplitude , noise (video) , acoustics , geology , signal (programming language) , optics , physics , computer science , electronic engineering , engineering , quantum mechanics , astronomy , artificial intelligence , image (mathematics) , programming language
For amplitude and phase response calibration of moving‐coil electromagnetic geophones two parameters are needed, namely, the geophone natural frequency, f 0 , and the geophone upper resonance frequency f u . The phase‐ellipse method is commonly used for the in situ determination of these parameters. For a given signal‐to‐noise ratio, the precision of the measurement of f 0 and f u depends on the phase sensitivity, f(δφ/δf) For some commercial geophones f(δφ/δf) at f u can be an order of magnitude less than the sensitivity at f 0 . In this paper we present an improved phase‐ellipse method with increased precision. Compared to measurements made with the existing phase‐ellipse methods, our method shows a 6‐ and 3‐fold improvement in the precision, respectively, on measurements of f 0 and f u on a commercial geophone.