| 摘要 |
An ultrasonic device for measurement of the level of media with non-uniform surface comprises a unit for calculation and indication and a unit for control of the sensor that comprises connected in series piezo-ceramic emitter, amplifier, comparator, microcontroller, controlled source of excitation pulses connected to the piezo-ceramic emitter. The microcontroller transfers to the unit of signal transformation the value of amplitude of background signal and time of propagation of ultrasonic signal where those are transformed to frequency-modulated signal. |
