| 摘要 |
PURPOSE:To measure easily acoustic output power at a practical particle speed level in a short time by moving an annular electromagnetic type oscillation detector along a transmitter and obtaining a maximum and a minimum output values. CONSTITUTION:The transmitter 10 in which the annular electromagnetic oscillation detector 12 is fitted movably is inserted into an ultrasonic oscillation system for outputting oscillation power generated by an oscillator 8 to an acoustic load 1. While the annular electromagnetic oscillation detector 12 is moved along the axis of the transmitter 10, the maximum value Vmax and minimum value Vmin of the ultrasonic particle speed in the transmitter 10 are measured to calculate an acoustic output Pa sent to the acoustic load from an equation. Further, a standing wave ratio SWR is calculated from Vmax/Vmin and the acoustic output Pa is calculated from an equation II. In the equations, K is a constant of proportion, rho the density of the transmitter, C the acoustic velocity in the transmitter, and S the sectional area of the transmitter. |
