Ultrasonic experiments 5: Semipermeable plate

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### Ultrasonic Experiments 4: Double Slits Experiment ### I have developed a series of experiments with ultrasound waves that can be performed by students in upper-level physics classes. The experiments will be presented in any order in the future. These experiments include: 1. Reflection and Absorption of Ultrasonic Waves 2. Standing Waves 3. Interference with Two Transmitters 4. Double-Slits Experiment 5: Effect of a Semipermeable Plate 6. Michelson Interferometer 7. Mach-Zehnder Interferometer 8. Distance Measurement with Arduino #### Components #### Circuit Board Mount: 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. Mount for Parallel Horns: The mount for the transmitter horn parallel to the receiver horn has no need for support. Parallel Horn: Left side: transmitter, right side: receiver, no support needed. Base: 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 or develop something better myself. No support is necessary. Nut M3 and Nut M32x: Generic nuts for M3 for the 20x20 aluminum profile system. Mount for Reflection Plate: The mount for the 150mm x 150mm aluminum plate. Semipermeable Plate: This semi-permeable plate consists of squares with a side length of 7 mm (an area of 50mm²) with a square cutout with a side length of 5 mm (an area of 25mm²). Pointer: For an exact determination of the wavelength, this pointer is helpful. #### Things You Need More #### Aluminum Profiles: I recommend one 50cm long profile for this experiment. 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. Aluminum Plates: I recommend a plate of 150mm x 150mm with a thickness of 2mm. #### Results of the Experiment #### If you slowly move the reflection plate towards the semipermeable plate, you get about every 4 mm (half wavelength!) an interference maximum.