Ultrasonic experiments 6: Michelson interferometer

### Ultrasonic experiments 6 : Michelson interferometer ### 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 #### 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 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 reflection plate: the mount for the aluminium plates semipermeable plate: This semi-permeable plate consists of squares with a side length of 7 mm (ie an area of ​​50mm²) with a square cutout with a side length of 5mm (ie an area of ​​25mm²). connector: ... to connect four 20x20 aluminium profiles. Support is not necessary. mount for connector: With a screw M3, this part can be movably mounted on the connector. Support is necessary. pointer : For an exact determination of the wavelength this pointer is helpful. Clamp the pointer to one of the two screens and move the screen very slowly in one direction. #### Things you need more #### Aluminium profiles : for this experiment i recommend four 30cm or 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 reflection screen i recommend two plates of 100mm x 150mm. All plates have a thickness of 2mm. #### Results of the experiment #### If you move one of the two reflectors very slowly into a direction, you can see that the signal shows a maximum (or a minimum) every 0.4mm. A hairdryer can now easily be used to display an ether wind.