Public Lab Research note


DIY-spectrometer episode 2 (using LEGO)

by TakeshiMatsumoto |

Read more: publiclab.org/n/16130


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;

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Parts;

LEGO

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*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

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Slit

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Light source

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Assembling;

Front

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Side

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Top

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Back

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*Caution;

Turn off the LEDs! In case of seeing the grating from the back. Strong light will hurt your eyes.

Experiment;

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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.

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Next step;

Liquid measurement using LEGO cuvette holder by @warren

https://publiclab.org/notes/warren/12-13-2017/assembling-the-public-lab-lego-spectrometer

by @programmer1200

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!



spectrometer


2 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.


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


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