spectroscopy
spectroscopy


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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 9 years ago
warren "Very interesting. What was the concentration of the copper solution? " | Read more » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » about 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 10 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 10 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 10 years ago
jmgianca "How did you measure the slit width so accurately? Nice work! " | Read more » over 10 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 10 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 10 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 10 years ago