The cardboard prototype helped eliminating some uncertainty.
![](https://cdn.hackaday.io/images/8003611585767155647.jpeg)
It worked better than expected and I got some very promising spectra. I used my mobile phone as camera, and two known laser sources to trim/calibrate the resulting spectra image. I did all that using just Gimp and a spreadsheet. The sensitivity of the sensor is not known so it can't be compensated, but as a proof of concept, it worked.
![First spectra with the cardboard prototype First spectra with the cardboard prototype](https://cdn.hackaday.io/images/1202721585767346336.png)
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