| 摘要 |
PROBLEM TO BE SOLVED: To attain very fine displacements in units of microseconds by forming a time lag in respective exciting coils for energizing them, so that a plurality of elastic waves based on magnetic strain generated by respective exciting coils overlap each other at one end surface of a magnetostrictive material. SOLUTION: The shape of a super magnetostrictive material 1 and exciting coils 2a, 2b are designated. A time lag is formed in only each of the exciting coils 2a, 2b so as to pass trigger pulse current and generate a displacement waveform at the end of the super magnetostrictive material 1. As a result, for example, pulse current is passed through the exciting coil 2a from the end of the super magnetostrictive material 1. When the pulse current is passed through the exciting coil 2b, after 12.4 μs the displacement of the displacement waveform of the end becomes one in which almost two displacements overlap each other, thus it is possible to attain very fine displacements in units of microseconds. |
