1. Lab Work #2
Sound wave velocity

2. I. Audible sound velocity
You have this lab equipment : a clap, 2 microphones, a computer with an acquisition system.
Imagine a procedure to find the velocity of the audible sound wave iin the air.
We set the 2 microphones in front of the clap, one before the other. We connect both mocrophones to the computer. We measure the delay t (time between the two signals received by the micerophones).
We measure the distance d between the the microphones.
And we calculate the speed : v = d / t
1. Imagine a procedure to find the velocity of the audible sound wave in the air.

3. 1. Acquistion parameters :
a) « durée »:

4. a) « déclenchement »:
We have set the trigger with the signal of the microphone that is near the clap.
Sens montant,
Voltage : find a value by making tests.
Pre-trig : 25 % so the computer records the signal before it arrives to the microphone.

5. 3. Measurements :
4. Calculation:
5. Validation:
a) relative error
b) what is the main incertainty ? How could you decrease it ?

6. Acquistion parameters :
a) « durée »:

7. II. Ultrasound velocity
Transmitter
Receiver
You have this lab equipment : a clap, 2 microphones, a computer with an acquisition system.
Imagine a procedure to find the velocity of the audible sound wave iin the air.
We set the 2 microphones in front of the clap, one before the other. We connect both mocrophones to the computer. We measure the delay t (time between the two signals received by the micerophones).
We measure the distance d between the the microphones.
And we calculate the speed : v = d / t
1. Set the transmitter on « pulse » mode.
Watch the signals with the software « oscillo5 »

9. Transmitter
Receiver

10. 3. Measurements :
4. Calculation:
5. Validation:
(relative error)

11. III. The sonar Imagine a procedure to show the principle of the sonar.
Imagine a procedure to show the principle of the sonar.
Lab equipement :
an ultrasound transmitter,
an ultrasound receiver,
an obstacle (wood or plastic piece)
computer with oscillo5