Improved phase-ellipse method for in-situ geophone calibration
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Abstract
For amplitude and phase response calibration of moving-coil electromagnetic geophones two parameters are needed, namely, the geophone natural frequency, f0, and the geophone upper resonance frequency fu. 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 off0 andfu depends on the phase sensitivity, f(δφ/δf) For some commercial geophones f(δφ/δf) atfu can be an order of magnitude less than the sensitivity atf0. 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 f0 andfu on a commercial geophone.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Improved phase-ellipse method for in-situ geophone calibration |
| Series title | Geophysical Prospecting |
| DOI | 10.1111/j.1365-2478.1986.tb00480.x |
| Volume | 34 |
| Issue | 4 |
| Year Published | 1986 |
| Language | English |
| Publisher | Wiley |
| Description | 8 p. |
| First page | 537 |
| Last page | 544 |
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