Jeulin Moduson 2 Mode D'emploi page 18

Ultrasounds
®
Moduson 2 transmitter telemeter 12V
Ref : 222 082
1 Phase velocity of sound with a single receiver
1.1 Experiment
Synchronise the oscilloscope on the "source" signal.
1.2 Note
• We can observe the increase in response on the receiver signal.
• Move the receiver by taking it closer to the source and note the displacement of the
• For a receiver displacement of 170 mm, we find a signal displacement of 0.5 ms on the
• For a receiver displacement of 340 mm, we find a signal displacement of 1 ms. This
1.3 Lighter experiment
By heating the air between the transmitter and the receiver with a lighter or a lighted bulb, we
observe the signal move: the phase velocity of sound increases with temperature.
ENGLISH
Phase velocity of sound with a single receiver
•
Set the transmitter on the «bursts» and «long bursts» positions as far away as
possible from the source.
•
View the receiver signal on channel A of the oscilloscope, and the "source" signal on
channel B. (time base: 2 ms / Div).
The offset with the signal sent to the transmitter is not significant.
On the other hand, the significant reading is that of the displacement of the start of this
signal on the screen (measurable lag or lead) in function of the receiver's displacement.
signal on the oscilloscope.
oscilloscope.
result corresponds to a phase velocity of 340 m / s.
 

. R.T
 
v =
 
 M 
Source signal
Source signal
Receiver signal
Receiver signal
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