Ultrasonic experiments 2: Standing wave

### 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).