Conversion efficiency research on the position of coils in the EMAT

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1135-1143
Author(s):  
Chao Jiang ◽  
Wencai Liu ◽  
Yun Song ◽  
Xinjun Wu
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Structure Design ◽  
Magnetic Flux Density ◽  
Electromagnetic Acoustic Transducer ◽  
Copper Sheet ◽  
Acoustic Transducer ◽  
Simulation And Experiment ◽  
Lift Off

The EMAT (electromagnetic acoustic transducer) has been used to measure the thickness of the metallic plate in some industries recently. Comparing with the piezoelectric transducer, its low energy conversion efficiency due to the lift-off effect limits its further application. Based on the eddy current energy partition, the distances between the copper sheet and the coils are studied. In consideration of the influence of magnetic flux density, a principle about the energy conversion efficiency and the coils position is proposed. The optimal distances between the copper sheet and the coils under a certain lift-off are obtained through a series of simulation and experiment. The results offer a method for the EMAT structure design.

scholarly journals The Effect of Magnet-to-Coil Distance on the Performance Characteristics of EMATs

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5096
Author(s):  
Yutang Wu ◽  
Yunxin Wu
Keyword(s):  
Numerical Simulations ◽  
Conversion Efficiency ◽  
Performance Characteristics ◽  
Practical Application ◽  
Electromagnetic Acoustic Transducer ◽  
The Poor ◽  
Acoustic Transducer ◽  
Lift Off

The poor conversion efficiency and obvious lift-off effect of the electromagnetic acoustic transducer (EMAT) are commonly known to be problems for its practical application. For the purpose of enhancing the performance of EMATs, numerical simulations were performed in order to analyze the effect of various parameters. The results indicate that only the magnet-to-coil distance can effectively enhance the conversion efficiency and weaken the lift-off effect at the same time. When the magnet-to-coil distance is 2 mm, the lift-off effect will continue to be weakened as the magnet-to-coil distance increases, whereas the decrease of the lift-off effect is inconspicuous and the conversion efficiency starts to decline at this time. Therefore, to get the best performance of this specific EMAT, the suitable magnet-to-coil distance is 2 mm. The experiment effectively verifies the improvement of EMATs with a magnet-to-coil distance of 2 mm.

Solar heat absorbing coating from multi-walled carbon nanotube composites with linear low-density polyethylene-coated copper sheet

2017 ◽  
Vol 36 (9) ◽  
pp. 714-721
Author(s):  
Samor Boonphan ◽  
Pisith Singjai
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Low Density Polyethylene ◽  
Bonding Layer ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Copper Sheet ◽  
Solar Absorptance ◽  
Solar Heat

This study aims to investigate the effects of multi-walled carbon nanotubes (MWNTs)/linear low density polyethylene composite-coated copper sheets on an energy conversion efficiency of a solar water heating system. Volume percentages of 1, 3 and 5 MWNTs were ball-mill mixed with linear low density polyethylene before using a hot press method to coat the composites. A bonding layer between the composites and the copper sheets was intercalated using MWNTs/polyvinyl butyral composites. The strength of the bonding layer was tested using a shear tension test. Microstructures of the composites were observed by scanning electron microscopy. The energy conversion efficiency and solar absorptance of the solar heat absorbing coatings were measured by a home-made method and ultraviolet visible spectroscopy, respectively. The results showed that the efficiency and the absorptance increased by 40% and 0.95, respectively with the increasing volume percentages of MWNTs up to 5 vol.% in linear low density polyethylene.

First-principles study on the electronic and optical properties of the orthorhombic CsPbBr3 and CsPbI3 with Cmcm space group

2021 ◽  
Author(s):  
Xianhao Zhao ◽  
Tianyu Tang ◽  
Quan Xie ◽  
like gao ◽  
Limin Lu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
First Principles ◽  
Energy Conversion Efficiency ◽  
Space Group ◽  
Absorbing Materials ◽  
Halide Perovskites ◽  
Lead Halide

The cesium lead halide perovskites are regarded as effective candidates for light-absorbing materials in solar cells, which have shown excellent performances in experiments such as promising energy conversion efficiency. In...

Metal-like electrical conductivity in LaxSr2−xTiMoO6 oxides for high temperature thermoelectric power generation

2017 ◽  
Vol 46 (18) ◽  
pp. 5872-5879 ◽  
Author(s):  
Mandvi Saxena ◽  
Tanmoy Maiti
Keyword(s):  
Power Generation ◽  
Electrical Conductivity ◽  
High Temperature ◽  
Energy Conversion ◽  
Thermoelectric Power ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Power Generators ◽  
Thermoelectric Power Generation

Increasing electrical conductivity in oxides, which are inherently insulators, can be a potential route in developing oxide-based thermoelectric power generators with higher energy conversion efficiency.

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