| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| lukebrown | "@warren Have posted a response in your note with some webcam images to try and illustrate what is going on at my end. In terms of sleeve design, m..." | Read more » | over 9 years ago | |||
| warren | "Hmm, the embed isn't working in comments. I'm going to post a quick note: http://publiclab.org/notes/warren/07-13-2015/testing-if-light-leaks-thro..." | Read more » | over 9 years ago | |||
| warren | "Hmm, I just did a test in (admittedly cloudy) sunlight vs. closing the blinds, and covering the device with a thick blanket, and didn't see a big d..." | Read more » | over 9 years ago | |||
| warren | "We would love some input on selecting a better material for the spec v3 -- it's complex since not every black cardstock is actually black in the ne..." | Read more » | over 9 years ago | |||
| lukebrown | "@warren Thanks! The sleeve was just a piece of corrugated cardboard, about 3 mm thick, folded around the enclosure and secured with some tape. I’..." | Read more » | over 9 years ago | |||
| warren | "HI, Luke! Great post. What paper did you use for the sleeve? We chose the black paper as it's absorbent in the near infrared range, but do you thin..." | Read more » | over 9 years ago | |||
| homechemist | "Anyway, tomorrow if I have time I am going to upload a new research note on chromatography that i think it will be really interesting for detecting..." | Read more » | over 9 years ago | |||
| homechemist | "Well, actually i cannot tell you exactly the concentration because i have prepared the solution roughly , but i think is more or less between 0,30..." | Read more » | over 9 years ago | |||
| warren | "Very interesting. What was the concentration of the copper solution? " | Read more » | over 9 years ago | |||
| homechemist | "The device is based on the public´s lab one, is one of the project that i posted time ago, the only thing that changes is the calibration(I used tw..." | Read more » | over 9 years ago | |||
| warren | "not large enough to detect most of the functional groups present What range would we need? I understood that the important fingerprint range is 16..." | Read more » | over 9 years ago | |||
| warren | "Wow! metallic solutions tend to block infrared light Really, even under 1000nm? Could this help to detect heavy metal contamination in water, or ..." | Read more » | over 9 years ago | |||
| khufkens | "There are three variables in this setup: 1) the light source's output, which needs to be characterized or idealized (you could use the sun as a re..." | Read more » | over 9 years ago | |||
| warren | "Uh, perhaps I am not fully understanding on my initial readthrough, but since we have a big need to characterize sensitivity in the webcams we use ..." | Read more » | over 9 years ago | |||
| khufkens | "If I can back out the spectral response I'll post it online for sure. So give it some time. " | Read more » | over 9 years ago | |||
| DarylWM | "Thanks for sharing your work. I've had the same trouble trying to find the spectral response curve for the OV5647 sensor, so this technique was ver..." | Read more » | over 9 years ago | |||
| warren | "Liz - you may have to dilute these in mineral oil to get the laser to shine through. There'll be a "how dark" step in the guide eventually... " | Read more » | over 10 years ago | |||
| Suiris | "That´s great! I found making a straight and even slit using razorblades difficult. When the blades got too close to eachother they touched the edge..." | Read more » | over 11 years ago | |||
| warren | "Mathew and I are getting ready for the smartphone spectrometers to ship and are printing slits on photographic printing plates (mathew probably kno..." | Read more » | over 11 years ago | |||
| Suiris | "Thanks! Good question. It is not an accurate measure, I used two razor blades and simply put them as close to each other as possible. Looking direc..." | Read more » | over 11 years ago | |||
| jmgianca | "How did you measure the slit width so accurately? Nice work! " | Read more » | over 11 years ago | |||
| Suiris | "The test was just to measure the difference in clarity between tap water and filtered water, using a single wavelength instead of a white warm LED ..." | Read more » | over 11 years ago | |||
| Ernie | "I afraid that using a laser will not tell you much about the chemical composition of any contamints in your water. The laser spectrum is much too ..." | Read more » | over 11 years ago | |||
| Suiris | "Hi drabanus, The time span between each spectra was less than 30 seconds and the LED light had been on for quiet some time before I began the tests..." | Read more » | over 11 years ago |