| 摘要 |
FIELD: measuring technique. ^ SUBSTANCE: ultrasonic lever meter comprises connected in series generator of radio pulses, amplifier, detector, piezoelectric vibrator connected to the generator and amplifier, and unit for automatic time adjustment. The control input of the amplifier is connected with the output of the unit for automatic time control of amplification. The unit also has display, microcontroller, comparator, attenuator, time interval meter, adder, and generator of threshold voltage. The first output of the microcontroller is connected with the display, and the second output is connected with the inputs of the unit of time automatic control of amplification, generator of threshold voltage, and meter of time intervals whose output is connected with the input of the microcontroller. The second input of the meter of time intervals is connected with the output of the comparator whose first input is connected with the input of the attenuator and output of detector, and second input is connected with the output of the adder. The first input of the adder is connected with the attenuator, and the second input is connected with the generator of threshold voltage. ^ EFFECT: enhanced resistance to noise and reliability of measurements. ^ 4 dwg |
