| 摘要 |
PURPOSE:To reproduce both a static pressure and dynamic pressure using a piezoelectric element by providing a proportional integrator to reproduce and output a force signal corresponding to the force impressed to the piezoelectric element. CONSTITUTION:An input amplifier 4 connected to a piezoelectric element via a cable 2 employs the follower constitution of a gain 1 fitted for the separation of the intervals of each step and the driving of other circuits and further fitted for detecting directly a signal of low energy. Switches SW1, SW2 are used for establishment of an initial value of an integrator. Namely by switching OFF the SW1 and switching ON the SW2 prior to the measurement of pressures, the electric charge of a capacitor C1 is discharged and the integral value is made zero. For measuring the pressures, an integral is started with the switchings SW1 and SW2 turned ON and OFF respectively. |
