This paper describes the detection of both single and array conductive microbead (PbSn) by using a spin-valve giant magnetoresistance (SV-GMR) as a sensor and the Helmholtz coil as an exciter based on eddy-current testing (ECT). Experiments were performed to detect a single and array conductive microbead, with three models. Each model consists of 4 4 microbeads but the microbead diameter and pitch were slightly different for each array. The microbead radius was 125 m and the pitch was 500 m. The ECT method was used to estimate the position of the centers of the microbeads and the error in the measurement was plotted on a plane. A good level of position resolution has been achieved and the signals were quite clear.
Abstract. In this chapter, we report the utilization of spin-valve type giant magnetoresistance (GMR) sensors in non-destructive evaluation (NDE). The NDE application is the inspection of high-density printed circuit boards (PCBs) based on the eddy-current testing (ECT) technique. An ECT probe with a GMR sensor is presented for the inspection of high-density double-layer PCB models. The utilization of a GMR sensor as a magnetic sensor showed that PCB inspection could be performed with high-spatial resolution and sensitivity, over a large frequency range.
The electric vehicle (EV) market is rising despite the COVID-19 pandemic in Thailand and the rest of the world. The Energy Policy and Planning Office, Ministry of Energy, is supporting the development of EV charging stations in Thailand. However, recent research published by Thais on the subject does not involve more than 1.24 kW wireless power transfer (WPT), whereas commercial EVs need at least 3.5 kW charging facilities. This study aims to develop a 10 kW WPT for EV charging in Thailand. The experimental procedure firstly required the design of block ferrite EE55 cores. Secondly, the transmitter and receiver coils were constructed from homemade Litz wire. Thirdly, the prototype magnetic parameters were measured and simulated. A 10 kW high-frequency inverter was then built and tested. The 10 kW prototype IPT system was subsequently simulated, constructed, and characterized. The results revealed that when the prototype IPT system was applied to the resistive tungsten halogen load during the first stage of the research, at 369.4 V DC input voltage and 32.33 A DC input current, the DC output voltage, and currents were 362.4 V and 29.67 A, respectively, while the maximum DC output power and the dc-to-dc efficiency equated to 10.75 kW and 90.00%, respectively.
This paper describes the detection of conductive microbead by spin-valve giant magnetoresistance (SV-GMR) with ferrite core exciter base on eddy-current testing (ECT) technique. The single and row conductive microbead were detected by the proposed ECT probe. The six microbeads were 125, 150, 200, 250, 300 and 360 m radiuses. The three model of single row was slightly pitched in each row with range from 400 to 1000 m. The analytical methods were calculated that confirmed the experimental result. The comparison of reference and proposed ECT probe signal variation with signal to noise ratio were expressed. The experimental results show that the proposed ECT can clearly detect both single and row conductive microbead position.
We present an eddy-current test (ECT) method for detecting conductive microbeads on a non-conductive substrate. A Helmholtz coil is used to generate an exciting magnetic field. The magnetic fields, generated by eddycurrents in a Pb-Sn microbead, are detected by a spinvalve giant magnetoresistive (SV-GMR) sensor. The experimental results are compared to an analytical solution for the magnetic field over the microbead. Early results for the detection of a grid of microbeads are also presented. 2 2 kr J kr J kr kr J kr J kr J kr kr J r b
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