Calibrating a tensor magnetic gradiometer using spin data
Scientific Investigations Report
2005-5045
Links
- More information: USGS Index Page (html)
- Download citation as: RIS | Dublin Core
Abstract
Scalar magnetic data are often acquired to discern characteristics of geologic source materials and buried objects. It is evident that a great deal can be done with scalar data, but there are significant advantages to direct measurement of the magnetic gradient tensor in applications with nearby sources, such as unexploded ordnance (UXO). To explore these advantages, we adapted a prototype tensor magnetic gradiometer system (TMGS) and successfully implemented a data-reduction procedure. One of several critical reduction issues is the precise determination of a large group of calibration coefficients for the sensors and sensor array. To resolve these coefficients, we devised a spin calibration method, after similar methods of calibrating space-based magnetometers (Snare, 2001). The spin calibration procedure consists of three parts: (1) collecting data by slowly revolving the sensor array in the Earth?s magnetic field, (2) deriving a comprehensive set of coefficients from the spin data, and (3) applying the coefficients to the survey data. To show that the TMGS functions as a tensor gradiometer, we conducted an experimental survey that verified that the reduction procedure was effective (Bracken and Brown, in press). Therefore, because it was an integral part of the reduction, it can be concluded that the spin calibration was correctly formulated with acceptably small errors.
Suggested Citation
Bracken, R.E., Smith, D.V., Brown, P., 2005, Calibrating a tensor magnetic gradiometer using spin data (Version 1.0): U.S. Geological Survey Scientific Investigations Report 2005-5045, 1 p. online; 9 p. report, https://doi.org/10.3133/sir20055045.
ISSN: 2328-0328 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Calibrating a tensor magnetic gradiometer using spin data |
| Series title | Scientific Investigations Report |
| Series number | 2005-5045 |
| DOI | 10.3133/sir20055045 |
| Edition | Version 1.0 |
| Year Published | 2005 |
| Language | ENGLISH |
| Description | 1 p. online; 9 p. report |
| Scale | 24000 |