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This paper studies a three-phase contactless power transformer with a magnet yoke at a horizontal misalignment. The self-inductances and mutual inductances are simulated with three-dimensional finite element method and the characteristics of inductances are formulated as simple equations. Numerical simulation results confirm that the misalignment causes unbalance currents and reduction in transfer...
This paper studies on a single-phase contactless power transfer system for automatic guided vehicles (AGVs). This system consists of transmitter lines placed on a floor and a receiver coil installed in AGVs. The design of the cables and lines is described. The several arrangement of ferrite bars for the receiver coil are compared to obtain maximum mutual inductances between the transmitter lines and...
In electric power systems, microwave relay stations are employed to exchange information using electromagnetic radio waves to control the systems. Some microwave relay stations are built on tops of mountains, which causes a high incidence of lightning strikes to microwave towers, and the lightning strikes may result in disturbances of microwave radio equipment. To protect microwave radio equipment...
A new scheme for designing a spatial light source for depth direction coherence control is proposed. This method is based on a combination of spatial coherence phenomena and the superposition principle. A computer-generated light source is projected onto a moving diffuser in order to realize multiple coherence peaks in the depth direction by synthesizing the longitudinal coherence function. Using...
A gauge block evaluation system was developed and its uncertainty estimation was performed for distance determination using the repetition interval of a femtosecond optical frequency comb — the national standard tool for measuring length in Japan.
We proposed the use of a femtosecond optical frequency comb for length measurement based on pulse trains' destructive interference. The theoretical derivation shows that the present technique offers a significantly different approach to length measurement. Preliminary experiment results of the destructive interference with different pairs of pulse trains show the possibility of the proposal method.
Interferometer for precise refractive-index measurement of glass-prism without prior knowledge is developed using a direct comparison of optical-path-changes in glass and air. Preliminary result shows uncertainty of 4.4 x 10-5 agreeing with the manufacturer’s values.
A positioning system based on optical zooming interferometer was developed using stabilized diode lasers by fs-comb. It achieved 1.3 nm accuracy and 30 pm stability by simplify the system and treatment of optical source’s polarization.
Absolute frequencies of an acetylene-stabilized laser at 1542 nm and an iodine-stabilized Nd:YAG at 1319 nm are measured at their second harmonics by use of a femtosecond optical comb based on a mode-locked Ti:sapphire laser. A frequency measurement system based on a mode-locked fiber laser (1.56mum) is also being developed for metrological applications in the telecommunication bands
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