### Ultrasonic experiments 3: Interference with two transmitters ###
I have developed a series of experiments with ultrasound waves that can be done by students in upper-level physics lessons. The experiments will be presented in arbitrary order in the future.
These experiments include:
1: reflection and absorption of ultrasonic waves
2: standing waves
3: interference with two transmitters
4: the double-slits experiment
5: the effect of a semipermeable plate
6: the Michelson interferometer
7: the Mach-Zehnder interferometer
8: the distance measurement with an Arduino
#### COMPONENTS ####
curcuit_board_mount: For the curcuit i used a board of 5cm x 7cm, which is sufficent for the ultrasonic sound generator. I chose a standard curcuit for the generator with the NE555. The electrical circuit I have shown in a pdf file. The mount can be printed without a support.
double transmitter mount: The distance between the two transmitters is 10cm
very simple horn: Not really a horn, but in this experiment it is important that the waves cover a range as large as possible.
base: For this part i used the excellent work of jandetlefsen and his thing http://www.thingiverse.com/thing:1412135. I could not find anything more suitable nor could I develop something better myself. Support is not necessary
nut M3 and M3_2x: a generic nut for M3 for the 20x20 aluminium profile system.
angle mount: mount to connect the profils
reciever mount: mount for the reciever
pointer_exp_3: For very accurate measurements, this pointer can be attached to the holder for the Reciever. One of the photos shows the installation.
#### Things you need more ####
Aluminium profiles : for this experiment i recommend two 50cm long profiles
Screws and nuts: a lot of M3 screws for mounting on the profiles (M3 x 10mm, M3 x 16mm). Some M5 screws and nuts for the bases.
#### Results of the experiment ####
If you move the receiver slowly on the profile, you can see very well on the oscilloscope where there are constructive and destructive interferences. One can clearly see constructive interferences up to n = 5.
sm_pb
