JPS6189182U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of this invention, Fig. 2a is a diagram of transmission and reception waveforms of the ultrasonic rangefinder when measuring a surface having the shape as shown in Fig. 3 with the ultrasonic rangefinder;
FIG. 2b is an explanatory diagram showing the ON and OFF states of the gate for measuring the round-trip propagation time at that time, and FIG. 3 is an explanatory diagram of the shape. 1... Transducer/receiver, 2... Transmitter, 3... Amplifier, 4...
Detector, 5...Peak detector, 6...Arithmetic circuit, 7...
counter.

Claims (1)

[Scope of utility model registration request] Ultrasonic distance measurement that measures the distance to a target by transmitting ultrasonic waves toward a target, receiving the reflected waves, and measuring the round-trip propagation time required from sending to receiving the ultrasonic waves. The device includes a transducer that transmits and receives ultrasonic waves, an amplifier that amplifies the received signal output from the transducer by changing the gain depending on the time from the time of transmission, and a receiver that amplifies the received signal output from the amplifier. A detector that extracts the envelope waveform of the received signal, a peak detector that compares each peak occurring in the envelope waveform output from the detector and detects the maximum peak, and a clock pulse that measures the round-trip propagation time. 1. An ultrasonic distance measuring device, characterized in that the resolution of an ultrasonic distance meter is improved by providing a counter and measuring the round trip propagation time from the time when the ultrasonic wave is sent until the time when the maximum peak occurs.