A TOTAL FIELD MAGNETOMETER FOR MOBILE OPERATION

Geophysics ◽  
1948 ◽  
Vol 13 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Eugene Frowe
Keyword(s):  
Magnetic Field ◽  
High Sensitivity ◽  
Ferromagnetic Material ◽  
Magnetic Data ◽  
Recording Device ◽  
Total Field ◽  
Total Magnetic Field ◽  
Inductive Type ◽  
Continuous Field ◽  
Better Than

A magnetometer which measures the earth’s total magnetic field is described. The detector or measuring element of the magnetometer contains three mutually perpendicular elements, two of which are utilized to orient the third, which in turn operates a recording device to record the total magnetic field. The detector elements are of the inductive type and do not require ferromagnetic material to give them the high sensitivity required in geophysical work. The presence of a magnetic field in the region of the detector causes alternating currents to be generated in the detector elements. These currents are amplified to actuate motors which control the orienting and neutralizing functions of the magnetometer. A tape recorder gives continuous field readings. The accuracy of the magnetic data taken is better than five gammas.

scholarly journals Magnetic Communication Using High-Sensitivity Magnetic Field Detectors

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3415 ◽  
Author(s):  
Maurice Hott ◽  
Peter A. Hoeher ◽  
Sebastian F. Reinecke
Keyword(s):  
Magnetic Field ◽  
Mobile Applications ◽  
Data Communication ◽  
High Sensitivity ◽  
Magnetic Data ◽  
Receiver Coil ◽  
Magnetic Field Sensors ◽  
Resistive Sensor ◽  
Field Sensor ◽  
Multiple Detectors

In this article, an innovative approach for magnetic data communication is presented. For this purpose, the receiver coil of a conventional magneto-inductive communication system is replaced by a high-sensitivity wideband magnetic field sensor. The results show decisive advantages offered by sensitive magnetic field sensors, including a higher communication range for small receiver units. This approach supports numerous mobile applications where receiver size is limited, possibly in conjunction with multiple detectors. Numerical results are supported by a prototype implementation employing an anisotropic magneto-resistive sensor.

scholarly journals Experimental Study on the Localization of Moving Object by Total Geomagnetic Field

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Chong Kang ◽  
Liming Fan ◽  
Quan Zheng ◽  
Xiyuan Kang ◽  
Jian Zhou ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Geomagnetic Field ◽  
High Sensitivity ◽  
Magnetic Anomalies ◽  
Target Localization ◽  
Total Field ◽  
Detection Range ◽  
Vector Sensors ◽  
Field Localization ◽  
Low Sensitivity

In the method of target localization based on magnetic anomalies, the scheme of vector field localization and experimental research are significant. Because more information of magnetic field can be measured by vector sensors, the position of the target can be directly calculated by the equations. However, the vector magnetic anomaly generated by the target is difficult to measure. And the detection range is small due to the low sensitivity of vector sensors. A method for target localization based on the total geomagnetic field is proposed. Its advantages are that the measurement of total magnetic field is not affected by the orientation of the total field sensors and the detection range is large due to their high sensitivity. In this paper, we focus on the localization using the array with the total field magnetometers. And we design an array structure with the total field magnetometers. Then, we obtain the higher order nonlinear equations for the target localization based on this array. The numerical method is used to solve the equations. Meanwhile, we present a method for eliminating the effect of geomagnetic field variations and uneven spatial distribution. In suburban roads, localization experiments were carried out. And the results showed that the relative error of target localization is less than 5% by using the proposed method.

A comparison of methods for approximating the vertical gradient of one‐dimensional magnetic field data

Geophysics ◽  
1986 ◽  
Vol 51 (9) ◽  
pp. 1725-1735 ◽  
Author(s):  
J. W. Paine
Keyword(s):  
Magnetic Field ◽  
Fourier Transform ◽  
Field Data ◽  
Total Error ◽  
Vertical Gradient ◽  
Magnetic Data ◽  
Total Field ◽  
One Dimensional ◽  
Convolution Filter ◽  
Principal Factors

The vertical gradient of a one‐dimensional magnetic field is known to be a useful aid in interpretation of magnetic data. When the vertical gradient is required but has not been measured, it is necessary to approximate the gradient using the available total‐field data. An approximation is possible because a relationship between the total field and the vertical gradient can be established using Fourier analysis. After reviewing the theoretical basis of this relationship, a number of methods for approximating the vertical gradient are derived. These methods fall into two broad categories: methods based on the discrete Fourier transform, and methods based on discrete convolution filters. There are a number of choices necessary in designing such methods, each of which will affect the accuracy of the computed values in differing, and sometimes conflicting, ways. A comparison of the spatial and spectral accuracy of the methods derived here shows that it is possible to construct a filter which maintains a reasonable balance between the various components of the total error. Further, the structure of this filter is such that it is also computationally more efficient than methods based on fast Fourier transform techniques. The spacing and width of the convolution filter are identified as the principal factors which influence the accuracy and efficiency of the method presented here, and recommendations are made on suitable choices for these parameters.

scholarly journals Some problems with old magnetic data processing

2020 ◽  
Vol 196 ◽  
pp. 02029
Author(s):  
Sergey Y. Khomutov ◽  
Manjula Lingala
Keyword(s):  
Magnetic Field ◽  
Scientific Community ◽  
Magnetic Measurements ◽  
Field Vector ◽  
Digital Data ◽  
Magnetic Data ◽  
Total Field ◽  
Analog To Digital ◽  
The Past ◽  
Lack Of Information

Continues magnetic measurements at the IKIR FEB RAS obser-vatories Magadan (MGD), Paratunka (PET), Yuzhno-Sakhalinsk (YSS), Cape Schmidt (CPS) and Khabarovsk (KHB) and CSIR-NGRI observatories Hyder-abad (HYB) and Choutuppal (CPL) have been started almost since their formation. A significant part of the results obtained is presented in the WDC and INTERMAGNET databases. However, a large amount of raw data remains un-processed and unavailable for using by scientific community. In the past few years, institutes has been making efforts to process and reprocess old magnetic data. Digital images of analog magnetograms of the Observatory Paratunka since 1967 were obtained and the possibility of their use for calculation hourly and minute values of magnetic field elements was evaluated. Old digital data that was available during the conversion from analog to digital magnetometers is processed. The main problem of processing or re-processing archived data is the lack of information (metadata) about the measurement conditions. First of all, these are the results of absolute observations, which are necessary to obtain the values of the elements of the total field vector. In this paper, some technologies are proposed that allow to use the data obtained during processing of analog magnetograms to adjust the digital magnetometers records. A signif-icant problem is the lack or inaccuracy of information about the temperature conditions in the variation pavilion, about magnetometers or support equipment maintenance or about works in and near the pavilions. As we accumulate the experience during the processing of old magnetic data, a “catalog” of noise and its typical images is formed. This makes it more reliable and efficient to identify and remove this noise from records.

scholarly journals Interpretation of Near Surface Based on the Magnetic Data at Geothermal Area, Jaboi, Sabang

2019 ◽  
Vol 8 (3) ◽  
pp. 90-93
Author(s):  
Dinni Mahmudi ◽  
Muhammad Isa ◽  
Didik Sugiyanto
Keyword(s):  
Magnetic Field ◽  
Magnetic Anomalies ◽  
Magnetic Data ◽  
Geothermal Area ◽  
Reference Field ◽  
Subsurface Structure ◽  
International Geomagnetic Reference Field ◽  
Total Magnetic Field ◽  
International Geomagnetic Reference ◽  
Proton Precession Magnetometer

Telah dilakukan penelitian geofisika menggunakan metode magnetik untuk mendapatkan struktur bawah permukaan di daerah prospek panas bumi Jaboi, Sukajaya, Kota Sabang. Pengukuran medan magnetik total dilakukan pada 40 titik menggunakan Proton Precession Magnetometer (PPM). Daerah Jaboi memiliki sudut inkinasi -4.416 dan deklinasi -0.875 dengan nilai medan magnetik total berkisar antara 41550 hingga 42600 nT. Untuk mendapatkan nilai anomali magnetik dilakukan koreksi diurnal dan koreksi IGRF (International Geomagnetic Reference Field). Setelah koreksi dilakukan diperoleh nilai anomali magnetik daerah panas bumi Jaboi antara -200 nT sampai dengan -950 nT. Selanjutnya hasil anomali magnetik ini digunakan dalam memodelkan struktur bawah permukaan dengan panjang lintasan 1800 m dari Tenggara-Barat Laut. Berdasarkan interpretasi data anomali magnetik menunjukkan daerah penelitian didominasi oleh anomali rendah yang berarti daerah manifestasi panas bumi. Interpretasi anomali tinggi dan rendah menunjukkan adanya patahan yang diduga sebagai patahan Ceuneuhot. Dari hasil pemodelan 2D menggunakan software Mag2DC, menunjukkan bahwa terdapat 5 lapisan dengan kedalaman 0 - 1000 m. Lapisan-lapisan ini adalah soil ( = 0,00 x 10-6 SI), andesit terubah (  = 13,408 x 10-6 SI), breksi tufa terubah (  = 12,686 x 10-6 SI), andesit terubah (  = 13,423 x 10-6 SI) dan breksi andesit (  = 13,535 x 10-6 SI). Melalui pemodelan ini diyakini zona patahan adalah patahan Ceuneuhot. Geophysical reasearch by using magnetic method was done in order to obtain subsurface structure of geothermal prospect area Jaboi, Sukajaya, Sabang City. The measurement of total magnetic field was taken at 40 points using Proton Precession Magnetometer (PPM). Jaboi area has an inklination angle -4.416 and declination angle -0.875 which has total magnetic field range between 41550 to 42600 nT. Diurnal Correction and IGRF (International Geomagnetic Reference Field) correction was used to obtain magnetic anomalies. The values of magnetic anomalies in Jaboi Geothermal Area is -200 to -950 nT. The result of magnetic anomalies was used to modelled the subsurface structure with profile distance is about 1800 m from Southeast to Northwest. Based on the magnetic anomalies data, the reaserch area dominated by low anomalies that indicated geothermal manifestation area. High and low magnetic anomalies indicated a fault that estimated as Ceuneuhot fault. From the result of 2D modelling using software Mag2DC, showed that the research area consist of 5 subsurface structure from 0 – 1000 m depth. The layers are soil (  = 0.00 × 10-6 SI), altered andesite (  = 13.408 × 10-6 SI), altered breccia-tuff (  = 12.686 × 10-6 SI), altered andesite (  = 13.423 × 10-6 SI), and breccia-andesite (  = 13.535 × 10-6 SI). Also from the model was  obtained the Ceuneuhot fault zone.  Keywords: Magnetik, Anomali Magnetik, Struktur Bawah Permukaan, Panas Bumi

scholarly journals Greenland ice cap aeromagnetic survey 1983: acquisition of high sensitivity total field and gradient magnetic data

1984 ◽  
Vol 120 ◽  
pp. 32-36
Author(s):  
L Thorning ◽  
M Bower ◽  
C.D Hardwick ◽  
P.J Hood
Keyword(s):  
High Sensitivity ◽  
Field Work ◽  
Magnetic Data ◽  
Total Field ◽  
Aeromagnetic Survey ◽  
East Greenland ◽  
Preliminary Results ◽  
Ice Cap ◽  
Geological Boundaries ◽  
First Time

A new high sensitivity aeromagnetic survey covering approximately 145 000 km2 of the lnland Ice (fig. 14) has been carried out during two periods of field operations in AprilIMay and September 1983. It is the first time a systematic, high sensitivity aeromagnetic coverage over the Greenland lnland Ice has been achieved. This note briefly reports on the background of the project, the fieId operations, and the preliminary results. Previous aeromagnetic surveys of ice-free regions of central and southern West Greenland (Thorning, 1976, 1977, and in prep.) have shown that many major geological boundaries are clearly reflected in the aeromagnetie data acquired over these regions. Geological field work in south-east Greenland has revealed the existence of similar geological boundaries, but their assumed position under the lnland lce has so far been guesswork. The aeromagnetic survey reported here is intended to provide real information on regional struetures under the lnland lce between the two coastal areas.

Distinguishing buried alluvium from till by using detailed total-magnetic-field data

1990 ◽  
Vol 27 (4) ◽  
pp. 513-519
Author(s):  
Erik J. Schwarz
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Power Spectra ◽  
Total Field ◽  
Magnetic Field Data ◽  
Glacial Sediments ◽  
Total Magnetic Field ◽  
River Terraces ◽  
Magnetic Analysis ◽  
Lateral Extent

Total-magnetic-field and vertical-magnetic-gradient profiles are characteristically different over alluvial and glacial sediments. Positive magnetic anomalies elongated in the river-valley direction but not in the structural trend of the underlying bedrock indicate the occurrence of magnetite enrichments within the alluvium. No evidence for such anomalies is found in survey data obtained in gravel pits located in tills. The logarithm of the power of the total-field profiles over the river terraces plotted against spatial frequency is structured, which is indicative of the presence of magnetic sources of certain depth and width. However, the power spectra over till may also show similar features if high-frequency bedrock anomalies are present in the data, so these spectra are not a reliable means of distinguishing between buried alluvium and till. The results show that magnetic analysis allows the discrimination between buried tills and alluvium in which magnetite concentrations of considerable lateral extent were formed.

AIRBORNE MAGNETOMETER PROFILE FROM PORTLAND, OREGON TO ALBUQUERQUE, NEW MEXICO

Geophysics ◽  
1954 ◽  
Vol 19 (2) ◽  
pp. 270-280 ◽  
Author(s):  
W. B. Agocs ◽  
J. C. Rollins ◽  
E. Bangs
Keyword(s):  
Magnetic Field ◽  
New Mexico ◽  
Sea Level ◽  
Flight Path ◽  
Magnetic Data ◽  
Mean Sea Level ◽  
Total Magnetic Field ◽  
General Geology ◽  
Wing Tip

An airborne magnetometer profile of the variations of the earth’s anomalous total magnetic field was obtained using a wing‐tip magnetometer installation in a flight from Portland, Oregon to Albuquerque, New Mexico. The magnetic data were obtained by flying at barometric altitudes ranging from 7,000 to 10,000 feet above mean sea level. The variations in the total magnetic field are tied to the known geology along the flight path, and the possible interpretations of the magnetic data are reviewed in light of the known general geology.

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