The method of magnetic flux leakage (MFL) is widely used for examination of pipeline wall to detect the presence of internal and external stress-corrosion. Magnetic scanner in which the MFL method is realized provides the pipe wall material magnetization, after magnetization the MFL is registered by magnetic field sensors. The stress-corrosion defects present in the pipeline wall are detected b...

Fringing electric and magnetic field sensors are widely used for non-destructive measurements of material properties. A simple conventional fringing field sensor consists of a sensor head, a current or voltage source, an impedance measurement circuit, and data processing/data acquisition capability. The sensor head is usually a patterned array of electrodes or windings on an electrically insula...

Magnetic particles are widely used as signal labels in a variety of biological sensing applications, such as molecular detection and related strategies that rely on ligand-receptor binding. In this review, we explore the fundamental concepts involved in designing magnetic particles for biosensing applications and the techniques used to detect them. First, we briefly describe the magnetic proper...

This paper analyzes the measurement error, caused by the position of the current-carrying conductor, of a circular array of magnetic sensors for current measurement. The circular array of magnetic sensors is an effective approach for AC or DC non-contact measurement, as it is low-cost, light-weight, has a large linear range, wide bandwidth, and low noise. Especially, it has been claimed that su...

Thick-film magnetoelastic sensors vibrate mechanically in response to a time varying magnetic excitation field. The mechanical vibrations of the magnetostrictive magnetoelastic material launch, in turn, a magnetic field by which the sensor can be monitored. Magnetic field telemetry enables contact-less, remote-query operation that has enabled many practical uses of the sensor platform. This pap...

The application specific paper describes a design approach for digital magnetic sensors Practical realizations are based on the Universal Frequency-to-Digital Converter (UFDC-1). By eliminating the need for ADC, the frequencyor duty-cycle-to-digital conversion schemes reduce the systems complexity. The results of such design approach are high-performance digital magnetic sensors with truly digi...

Microelectromechanical systems (MEMS) resonators have allowed the development of magnetic field sensors with potential applications such as biomedicine, automotive industry, navigation systems, space satellites, telecommunications and non-destructive testing. We present a review of recent magnetic field sensors based on MEMS resonators, which operate with Lorentz force. These sensors have a com...

In the present paper, the electrochemical properties of magnetic iron oxide nanoparticles (Fe2O3 and Fe3O4) as highly sensitive sensors for the simultaneous determination of hydrazine and hydroxylamine was described. The electrochemical behavior of hydrazine and hydroxylamine was investigated using cyclic voltammetry, chronoamperometry and differentia...

Magnetic field sensors based on organic thin-film materials have attracted considerable interest in recent years as they can be manufactured at very low cost and on flexible substrates. However, the technological relevance of such magnetoresistive sensors is limited owing to their narrow magnetic field ranges (∼30 mT) and the continuous calibration required to compensate temperature fluctuation...