Ultrasonic experiments 2: Standing wave

thingiverse

### Ultrasonic Experiments 2: Standing Waves ### I've developed a series of experiments with ultrasound waves suitable for upper-level physics lessons. The experiments will be presented in an arbitrary order. These experiments include: 1: Reflection and Absorption of Ultrasonic Waves <b> 2: Standing Waves </b> 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: Distance Measurement with an Arduino #### COMPONENTS #### <b> Circuit Board Mount: </b> I used a 5cm x 7cm circuit board, which is sufficient for the ultrasonic sound generator. A standard circuit with the NE555 was chosen. The mount can be printed without support. <b> Mount for Horn: </b> This print is the mount for the transmitter and receiver horn. Two of these are needed for this experiment. No support required. <b> Horn: </b> I chose an angle of approximately 20 degrees for this horn. Two horns are required for this experiment. No support necessary. <b> Simple Horn: </b> An alternative horn design is available. <b> Base: </b> The base was adapted from the excellent work of jandetlefsen and his thing http://www.thingiverse.com/thing:1412135. A more suitable solution could not be found, nor did I develop a better one myself. <b> Nut M3 and Nut_M3_2x: </b> A generic nut for M3 is required for the 20x20 aluminum profile system. Three nuts are needed for this experiment. <b> Mount for Plate: </b> Support is necessary for this component. <b> Mount for Small Receiver: </b> When examining a standing wave, it's essential to detect the area of ​​the wave in a way that disturbs the standing wave as little as possible. Therefore, this component has been built very narrow. The detector is obtained by opening a standard ultrasonic receiver (UST-40R) carefully. #### Things You Need More #### <b> Aluminum Profiles: </b> A 50cm long aluminum profile is recommended for this experiment. <b> Screws and Nuts: </b> M3 screws are required for mounting on the profiles (M3 x 10mm, M3 x 16mm), as well as some M5 screws for the bases. <b> Aluminum Plate: </b> A 150mm x 150mm aluminum plate with a thickness of 2mm is recommended as a reflector. #### Results of the Experiment #### Moving the detector slowly on the rail, you can see that the signal has a maximum every 4mm (corresponding to half of the wavelength).