A comparison between published analytical results with measured experimental results of the magnetic field produced by thermoelectric currents of subsurface semi-spherical pure tin inclusions embedded in a copper bar under the influence of an external heating and cooling into the specimen is presented. The experimental magnetic flux density measurements show a reasonable agreement as compared t...

A new important advantage has been discovered for the fundamental-mode operation of the orthogonal fluxgate employing an amorphous wire. It has been found that a great enough dc bias practically completely suppresses the magnetic noise generated in the fluxgate core by the ac-bias field; the fluxgate resolution becomes limited only by the excess electric noise in the ac-bias current. As a resul...

In March of 2021, the Berlin-based company cmp continued geophysical prospection works at ancient city Artashat-Artaxata (Ararat Province, Armenia). The was founded by Artashes-Artaxias I in early 2nd century BC and served as his capital. First magnetic measurements were conducted Eastern Atlas September 2018. during 5-day survey a total surface approximately 19.5 ha investigated use LEA MAX gr...

Alternating dc bias enables eliminating offset in orthogonal fluxgates operated in fundamental mode. However, the alternating dc bias reversals increase the fluxgate magnetic noise. It is shown in this work that the excess magnetic noise is related to the dynamics of the magnetic domains in the fluxgate core. The alternating dc bias reverses the fluxgate core magnetization causing nucleating do...

[1] The Space Technology 5 (ST-5) mission successfully placed three micro-satellites in a 300 4500 km dawn-dusk orbit on 22 March 2006. Each spacecraft carried a boommounted vector fluxgate magnetometer that returned highly sensitive and accurate measurements of the geomagnetic field. These data allow, for the first time, the separation of temporal and spatial variations in field-aligned curren...

High-precision magnetic micro-sensor is an interdisciplinary subject of magnetic field measurement techniques and micro-electromechanical systems (MEMS) technology. A micro-fluxgate magnetic sensor based MEMS technology was designed and fabricated in this paper. This device is a micro-magnetic sensor with a symmetric construction, closed magnetic circuits and differential form. A 25μm thick Flu...

We set up an electronic gradiometer for magnetocardiography (MCG) in an unshielded environment. The electronically balanced gradiometer consists of high-temperature radio-frequency superconducting quantum interference device (rf SQUID) magnetometers. The rf SQUID magnetometers are arranged to form the electronic first-order, four-vector gradiometer, or second-order gradiometer. The output of th...

The system has been demonstrated over a magnetite skarn deposit at Tallawang, near Gulgong, NSW, which is essentially two-dimensional (2D). The 2D structure was important because it allowed an unaliased total magnetic intensity (TMI) survey to be carried out in parallel, from which tensor components could be calculated to directly compare with the tensor components measured with the rotating gr...

We present the development of an algorithm for inverting multi-component gravity gradiometer data to recover three-dimensional (3-D) distributions of density contrast for salt imaging. The algorithm is a direct adaptation of the author’s earlier work on 3-D inversion of magnetic data. The underlying method is based upon a regularized inversion that constructs a density contrast distribution hav...