| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Craziks | "How do you calculate absorbance from intensity and wavelength??. Give beers formul@ " | Read more » | over 4 years ago | |||
| vanirishdelapena | "@ddnoob hello sir I was wondering how did you connect the ccd sensor to the arduino uno? any response would be helpful. " | Read more » | about 6 years ago | |||
| warren | "Oh, interesting! Maybe @programmer1200 would be interested in this, re: related work on a turbidity sensor... " | Read more » | almost 7 years ago | |||
| Ag8n | "The current epa method for turbidity, with standard prep, is at: Https://epa.gov/sites/production/files//2015-08/documents/method_180-1_1993.pdf ..." | Read more » | almost 7 years ago | |||
| Ag8n | "Absolutely correct. The fluorescence spectrometer is the same layout as for the basic turbidimeter. The standards are a bit of a pain, but quite ..." | Read more » | almost 7 years ago | |||
| warren | "So a design using the Lego Spectrometer, for example, might need a right-angle light source -- but that's not so bad, since already with fluorescen..." | Read more » | almost 7 years ago | |||
| warren | "Hm, good point -- actually going back to an old post there's some great stuff here: https://publiclab.org/notes/donblair/08-25-2015/turbidity-001 ..." | Read more » | almost 7 years ago | |||
| Ag8n | "By definition, turbidity measures the amount of light scattered at a 90 angle. So there would have to be a change in the optical layout from the ..." | Read more » | about 7 years ago | |||
| Sahil | "Can this spectrometer identify the type of material.... for ex.:- spectrum of an apple. Or spectrum of wood??????? " | Read more » | about 7 years ago | |||
| warren | "Related: How can we detect contaminants in water samples with a DIY spectrometer using reagents? https://publiclab.org/notes/warren/12-18-2017/ca..." | Read more » | about 7 years ago | |||
| warren | "OK, my next thought on this would be to scan 2 at once instead of 3, so that at least any non-evenness would be symmetric horizontally. But I'm not..." | Read more » | about 7 years ago | |||
| programmer1200 | "Hi Warren I'm also working on a beers law based machine for testing one cuvette at a time and measuring the amount of light penetrating through the..." | Read more » | about 7 years ago | |||
| warren | "I think the light is not evenly distributed, and in the scan I took, there's just more light in the middle. I'd like to correct for this but it's e..." | Read more » | about 7 years ago | |||
| warren | "Also noting that @ygzstc cited some work supporting the use of the area under the curve in a spectrum data reading instead of intensity at one wave..." | Read more » | about 7 years ago | |||
| warren | "Just to clarify here, I believe to sum up we can say that: IF a reagent reacts linearly (for example, if doubling the concentration of the thing t..." | Read more » | about 7 years ago | |||
| warren | "Copying in answer from @stoft, here: It is my understanding that Beer's law is not the relationship between reagent's effect on color, but is the ..." | Read more » | about 7 years ago | |||
| bhickman | "Hi tekno. I would definitely go with the 3D printed version if thats available for you. The 3D printed version makes alignment much easier. " | Read more » | almost 8 years ago | |||
| tekno | "I found that you have 2 CCD Photodiode Array Spectrometer projects here and was wondering of the 2 which one would be better to work on https://pu..." | Read more » | almost 8 years ago | |||
| ddnoob | "Thank you very much, bhickman " | Read more » | about 8 years ago | |||
| bhickman | "Hi ddnoob. I have not quantified the resolution, but by my estimate, the wavelength resolution is around 1nm when everything is optimized. The inte..." | Read more » | about 8 years ago | |||
| ddnoob | "Dear bhickman, I have 2 questions: 1.How is resolution of the spectrometer? 2. Can you change resolution of this spe..." | Read more » | about 8 years ago | |||
| bhickman | "I updated the link. Thanks. " | Read more » | about 8 years ago | |||
| tekno | "thanks " | Read more » | about 8 years ago | |||
| ddnoob | " WheeTrometer_3.0-master_-2-.zip Tekno " | Read more » | about 8 years ago |