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Fully Automated Light Scattering Experiment

Mie-setup.JPG Fully Automated Light Scattering Experiment
Setup_Parts.jpg Fully Automated Light Scattering Experiment
ae056b8640ec803ec03a4795503514dd.png Fully Automated Light Scattering Experiment
aa1234c38a06ac5727d0cae9080c563e.png Fully Automated Light Scattering Experiment
803ba73f73890c1ca45acc321c03c063.png Fully Automated Light Scattering Experiment
cd9078cc7a076266f1abfcc510ef05bd.png Fully Automated Light Scattering Experiment
028859e64d83807b11238d10958e3d64.png Fully Automated Light Scattering Experiment
ArduinoCase.stl Fully Automated Light Scattering Experiment
SampleMount.stl Fully Automated Light Scattering Experiment
ServoDetectorMount.stl Fully Automated Light Scattering Experiment
MainSocket.stl Fully Automated Light Scattering Experiment
PhotodiodeMount.stl Fully Automated Light Scattering Experiment
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  • ArduinoCase.stl
  • MainSocket.stl
  • Mie_Supplement.pdf
  • Mie_complete.zip
    • Arduino/ArduMie.ino
    • Arduino/Manual.txt
    • Mie_scripts/mie_pt.m
    • Mie_scripts/extrema.m
    • Mie_scripts/mie_abcd.m
    • Mie_scripts/smooth.m
    • Mie_scripts/findMinDist.m
    • Mie_scripts/mie_S12.m
    • Mie_scripts/mie_table.m
    • Mie_scripts/license.txt
    • Mie_scripts/mie_tetascan_lim.m
    • gpl.txt
    • 3D_printing/STL/ServoDetector_Mount.stl
    • 3D_printing/STL/SampleHolding.stl
    • 3D_printing/STL/MainSocket.stl
    • 3D_printing/STL/ArduinoHousing.stl
    • 3D_printing/STL/PhotodiodeHolding.stl
    • 3D_printing/SCAD/MainSocket.scad
    • 3D_printing/SCAD/SampleHolding.scad
    • 3D_printing/SCAD/ArduinoHousing.scad
    • 3D_printing/SCAD/PhotodiodeHolding.scad
    • 3D_printing/SCAD/ServoDetector_Mount.scad
    • Calibration_and_measurement/MieScattering.py
    • Calibration_and_measurement/ArduMie.py
  • PhotodiodeMount.stl
  • SampleMount.stl
  • ServoDetectorMount.stl

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Publication date 2023-08-01 at 08:20
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Published to Thingiverse on: 2017-08-25 at 13:36
Design number 1355991
CScholz

CScholz

3D printer file info

3D model description

A fully automated inexpensive($50) educational lab experiment to measure optical scattering, in particular polarization and angular cross-section.

On a beginner level the setup is suitable to measure scattering of light by optical gratings. In fact scattering from a CD-R surface is used to calibrate the angular servo control using the well-known equation "grating_constant x sine(nth scattering angle) = n x wavelength".

The experiment was developed in our laboratory physics courses to demonstrate Mie-scattering by microscopic colloidal particles. Mie-scattering refers to light scattering by objects that are comparable to the wavelength. This is typically used in expensive laboratory equipment, to determine size-distributions of colloidal suspensions.

The setup is controlled via an Arduino which fits in the bottom of the device. A small amount of soldering or a separate bread-board is required to assemble the device and should be possible on a undergraduate or even school level.

Detailed information, a list of required components, assembly instructions and software (OpenSCAD files; Arduino Firmware; Python & Octave scripts for analysis of measurements - all GPL licensed) can be found on our dedicated website: http://www.mss.cbi.fau.de/Mie-experiment or as a PDF as well as the necessary scripts. These can also be found in the Thing Files section.

A live-demonstration of the measurement can be found here: https://www.youtube.com/watch?v=A-WL2huUDuc

The device was featured in the 3/17 German issue of the Make magazine: https://www.heise.de/make/meldung/Guenstig-dank-Maker-Technik-Optik-Experiment-fuer-Schulen-und-Unis-3716721.html

For details on the experiment and explanation of the physics of Mie-scattering we published a scientific paper here:

C. Scholz, A. Sack, M. Heckel and T. Pöschel, Inexpensive Mie scattering experiment for the classroom manufactured by 3D printing, Eur. J. Phys. 37 055305 (2016)
http://iopscience.iop.org/article/10.1088/0143-0807/37/5/055305

All parts were printed using an FDM printer (Kühling & Kühling RepRap), PLA or ABS material with 20% filling and 80% for the base. Post-processing involves gluing and screwing together the individual parts and electronic components. Some minor adjustments might be needed to the components (servos, diodes, etc) that are available to you.

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