Ultrasonic experiments 2: Standing waves

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-slit 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 with the NE555. The mount can be printed without a support.

mount for horn: this print ist the mount for the transmitter and the reciever horn. For this experiment yue will need two of them. No support

horn: For this horn i choose an angle of approx. 20 degrees. For this experiment you will need two of them. No support.

simple horn: An alternative horn.

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.

nut M3 and nut_M3_2x: a generic nut for M3 for the 20x20 aluminium profile system: For this experiment you will need three of them.

mount for plate : support is necessary.

mount for a small reciever : When examining a standing wave, one must detect the area of ​​the wave in a way to disturb the standing wave itself as little as possible. Therefore, this component has been built very narrow. The detector is obtained by opening a standard ultrasonic reciever (UST-40R) very, very carefully.

Things you need more

Aluminium profiles: for this experiment i recommend one 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 for the bases.

Aluminium plate: i recommend a plate of 150mm x 150mm with a thickness of 2mm as a reflector

Results of the experiment

Moving the detector slowly on the rail, then you can see about every 4mm that the signal has a maximum (corresponding to the half of the wavelength).