In this paper, we present an eddy current transducer with rotating permanent magnets for the inspection of planar conducting plates. The transducer consists of a rotating head with permanent magnets, which is used to generate variable magnetic fields and thus induce eddy currents in the tested material. Two Hall sensors connected in a differential manner are used to detect a nonuniform distribution of eddy currents induced in a specimen containing a defect. To prove the usability of the transducer, a number of experiments were conducted on thick aluminum samples containing notches at different depths. Selected results of the achieved measurements are presented.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6471460 | PMC |
| http://dx.doi.org/10.3390/s19061408 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Magnetic resonance imaging (MRI) is one of the most commonly used tools in neuroscience. However, it implies exposure to high noise levels. Exposure to noise can lead to temporary or permanent hearing loss, especially when the exposure is long and/or repeated.
View Article and Find Full Text PDFUnderwater low-power electromagnetic transducers with Central permanent magnet integration.
J Acoust Soc Am
January 2025
College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, China.
High-efficiency electromagnetic transducers are crucial for enabling the self-sustained operation of underwater electromagnetic sound sources under power-constrained conditions as noted by Hao, Xie, and Ma [Proceedings of the 2019 Western China Acoustics Academic Conference, Guangzhou, China (November 5-9, 2019)]. This paper proposes a permanent magnet drive technology to enhance the electromechanical conversion efficiency of can-type electromagnetic transducers under low-power driving conditions. The can-type transducers consist of coils, an armature, and a cylindrical magnetic core with a central pillar, similar to the pot core proposed by Cui, Xu, Xu, and Shui [Electr.
View Article and Find Full Text PDFFuzzy self-tuning fractional order PD permanent magnet synchronous motor speed control based on torque compensation.
Sci Rep
January 2025
Changchun Automobile Economic & Technological Development Zone Employment Service Bureau, Jilin City, China.
The permanent magnet synchronous motor control system is characterized by its nonlinear and strongly coupled complexity, presenting significant challenges for control performance optimization. To address these challenges, a Fuzzy adaptive fractional order [Formula: see text] control strategy based on torque observation compensation is proposed. The parameters of the fractional order [Formula: see text] controller are optimized real time using fuzzy logic reasoning, in order to enhance the speed of parameters tuning, a graphical design method of the fractional order [Formula: see text] controller parameters based on frequency domain performance indicators is proposed to obtain the initial values of the fuzzy adaptive fractional order [Formula: see text] controller parameters graphically and intuitively.
View Article and Find Full Text PDFTuneable, variable, optical attenuation through an optical circulator with a broad, linear attenuation range of Δ ∼ (30-40) dB is demonstrated using non-reciprocal Faraday rotation in a double-pass configuration with a combination of permanent magnets and an electromagnet. A fiber-coupled magneto-optical variable optical attenuator (MVOA) operates over the near IR with an attenuation tuning range of Δ > 30 dB, a resolution of Δ ∼ 0.02 dB, a response time of < 2 ms, and a temperature dependence over = 25-70°C of Δ / Δ = -8 × 10 dB/°C.
View Article and Find Full Text PDFRare association of posterior reversible encephalopathy syndrome (PRES) with hemolysis, elevated liver enzymes and low platelets (HELLP) syndrome - A case report and review of the literature.
Heliyon
December 2024
Neurology Clinic, University Clinical Center of Serbia, Belgrade, Serbia.
Introduction: The hemolysis-elevated liver enzymes-low platelet counts (HELLP) syndrome and posterior reversible encephalopathy syndrome (PRES) are rare conditions that can complicate pregnancy and the early postpartum period. Although both are closely related to hypertensive pregnancy disorders, their association is rarely described, so the outcome of these patients remains unknown. We present a case report of PRES associated with HELLP syndrome and a review of all previously published cases, including demographic characteristics, clinical presentation, treatment, and outcome.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!