Background;
We launched DIY-spectrometer three weeks ago. This product was supposed to be used by experts who can treat special optics and tuning by oneself. However, there was a problem from the viewpoint of making a spectrometer by oneself, because of the product was made of aluminum enclosure and used some optical components. So we tried making a spectrometer using LEGO to focus on DIY.
Purpose;
1, For beginners, easy to assembling and to obtaining accurate results.
2, For researchers, we offer a low cost spectrometer for preliminary experiments. Also make it available for workshops like public lectures.
Optical System;
Parts;
LEGO
*Of course you need top cover, using same parts of Base.
If you use liner ccd, need to back wall and completely light shield.
Optics
Slit
Light source
Assembling;
Front
Side
Top
Back
*Caution;
Turn off the LEDs! In case of seeing the grating from the back. Strong light will hurt your eyes.
Experiment;
Data analysis;
1. Using photograph, take a picture by Rasp PI camera, Cell phone, Digital camera etc.
2. Using Liner sensor, Tohshiba, SONY, HAMAMATSU etc.
Next step;
Liquid measurement using LEGO cuvette holder by @warren
https://publiclab.org/notes/warren/12-13-2017/assembling-the-public-lab-lego-spectrometer
https://publiclab.org/notes/programmer1200/03-29-2018/spectrometer-3-0-add-on-v2
Notice;
1. Protect your eyes when using strong LEDs.
2. I intentionally use strong LEDs so that diffracted light can be understood well even in indoor lighting in this time. When you detect this light with a CCD it will be saturate immediately.
3. In order to reduce light reflection and scattering, it is effective to stick a black cloth on the inside.
4. It is better to seal from the gap of the block to prevent light from entering.
Safety first and Enjoy!
4 Comments
There's something strange about your "spectrum" it seems to run green,yellow,pink,blue,green. Seems like there are several overlapping color patterns. Strictly speaking the beam should be brought to a focus onto a slit to cut down spacial spread of the source illumination.
Reply to this comment...
Log in to comment
Hi @david_uwi, Thanks for your advise. Your comment is right. We did not perform alignment at all in this example, so I would like to report the results if we will have a chance. For alignment, please refer to the previous report. https://publiclab.org/notes/TakeshiMatsumoto/03-20-2018/diy-spectrometer
Reply to this comment...
Log in to comment