Principle
An ultrasonic transmitter emits sound pulses onto a reflector, from which recording of them by a receiver shows a time delay. The velocity of sound is calculated from the path length and transmission time of the sound pulses.
Tasks
1.Determine transmission times for different distances apart of the transmitter and the receiver.
2.Plot a graph of the path lengths of the sound pulses against their transmission time.
3.Determine the velocity of sound from the graph.
What you can learn about
Longitudinal waves
Sound pressure
Phase- and group velocity
Sonar principle
Materiallist Product Amount
Software Cobra3 Universal recorder 14504-61 1
Adapter, BNC socket/4 mm plug pair 07542-27 2
Screened cable, BNC, l 750 mm 07542-11 2
Meter scale, demo. l=1000mm 03001-00 1
Measuring tape, l = 2 m 09936-00 1
Screen, metal, 300 x 300 mm 08062-00 1
Barrel base -PASS- 02006-55 3
Power supply 12V / 2A 12151-99 1
Cobra3 BASIC-UNIT, USB 12150-50 1
Ultrasonic receiver on stem 13902-00 1
Ultrasonic transmitter 13901-00 1
Power supply 5 VDC/2.4 A withDC-socket 2.1 mm 13900-99 1
Ultrasound operation unit 13900-00 1
