Ultrasonic experiments 6: Michelson interferometer

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### 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 <b> 6: the Michelson interferometer </b> 7: the Mach-Zehnder interferometer 8: the distance measurement with an Arduino #### COMPONENTS #### <b> curcuit_board_mount: </b> 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. <b> mount for horn: </b> this print ist the mount for the transmitter horn and the reciever horn. Support is not necessary. <b> horn: </b> For this horn i choose an angle of approx. 20 degrees. Support is not necessary. <b> base: </b> 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 <b> nut M3: </b> a generic nut for M3 for the 20x20 aluminium profile system: For this experiment you will need five of them. <b> mount for reflection plate: </b> the mount for the aluminium plates <b> semipermeable plate: </b> 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). <b> connector: </b> ... to connect four 20x20 aluminium profiles. Support is not necessary. <b> mount for connector: </b> With a screw M3, this part can be movably mounted on the connector. Support is necessary. <b> pointer </b>: 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 #### <b> Aluminium profiles </b>: for this experiment i recommend four 30cm or 40cm long profiles <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. <b> Aluminium plates: </b> 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 <b> very </b> 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.