Ultrasonic experiments 3: Two transmitter interference

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### 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 <b>3: Interference with Two Transmitters</b> 4. The Double-Slits 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> For the circuit, I used a 5cm x 7cm board, which is sufficient for the ultrasonic sound generator. I chose a standard circuit for the generator with the NE555. The electrical circuit can be seen in a pdf file. The mount can be printed without support. <b>Double Transmitter Mount:</b> The distance between the two transmitters is 10cm <b>Very Simple Horn:</b> Not really a horn, but it's essential that the waves cover as large of an area as possible. <b>Base:</b> For this part, I used the excellent work of jandetlefsen and his thing http://www.thingiverse.com/thing:1412135. I couldn't find anything more suitable, nor could I develop something better myself. Support is not necessary <b>Nut M3 and M3_2x:</b> A generic nut for M3 for the 20x20 aluminum profile system. <b>Angle Mount:</b> A mount to connect the profiles <b>Receiver Mount:</b> A mount for the receiver <b>Pointer Exp 3:</b> For very accurate measurements, this pointer can be attached to the holder for the Receiver. One of the photos shows the installation. #### Things You Need More #### <b>Aluminum Profiles:</b> I recommend two 50cm long profiles for this experiment <b>Screws and Nuts:</b> 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.