Ultrasonic experiments 4: Double slits experiment
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-slits experiment
5: the effect of a semipermeable plate
6: the Michelson interferometer
7: the Mach-Zehnder interferometer
8: the distance measurement with an Arduino
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 for the generator with the NE555. The electrical circuit I have shown in a pdf file. The mount can be printed without a support.
mount for horn: this print ist the mount for the transmitter horn and the reciever horn. Support is not necessary.
horn: For this horn i choose an angle of approx. 20 degrees. Support is not necessary.
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. Support is not necessary
nut M3: a generic nut for M3 for the 20x20 aluminium profile system: For this experiment you will need five of them.
mount for the double slits 1, 2, 3: the mount system for the double slits. Part 1 and part 2 are connected by a grub screw M3. Support is necessary.
endcap pointer : These parts are advantageous for accurate measurements.
Things you need more
Aluminium profiles : for this experiment i recommend two 40cm long profiles
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.
Aluminium plates: for the double splits i recommend two plates of 100mm x 100mm, for the middle plate i recommend a 20mm x 100mm plate, but also a 10mm x 100mm or a 30mm x 100mm plate is possible. All plates have a thickness of 2mm.
Results of the experiment
With a gap distance of g = 30 mm and a gap width of w = 10mm, one can easily recognize the constructive interference of zeroth, first and also second order. With a direct distance measurement, the wavelength of the ultrasonic wave can be determined with sufficient accuracy.