JPH0352689U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the ultrasonic measuring device of the present invention, Fig. 2 is a diagram showing output waveforms of each part of Fig. 1, and Fig. 3 a and b explain problems of the conventional technology. Figures 4 and 5 are block diagrams and waveform diagrams showing other embodiments. 1... Arithmetic circuit, 2... Ultrasonic oscillation circuit, 3...
...Switching circuit, 4...Transducer/receiver, 5...Amplifier, 6
... Delay circuit, 7 ... Peak detection circuit, 8 ... Comparator, 9 ... Output circuit.

Claims (1)

[Claim for Utility Model Registration] Ultrasonic waves are sent out towards a measurement target such as a liquid level, the reflected waves are received by a transducer and converted into an electrical signal, and the signal that exceeds the detection threshold is transmitted to the measurement target. In an ultrasonic measuring device that detects the reflected waves as reflected waves from the transmitter and measures the distance to the measurement target using the time from the transmission of the ultrasonic waves to the detection, a peak detection circuit 7 that detects and holds a peak value; a comparator 8 that compares the peak value detected and held by the peak detection circuit with the wave received by the handset; and an output pulse of the comparator. A calculation in which the last output pulse or pulse group that reaches within a predetermined span based on the transmission of the ultrasonic wave as an input is detected as a reflected wave from the measurement target, and the distance to the measurement target is calculated by a predetermined calculation. An ultrasonic measuring device comprising a circuit 1.