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dssk
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Author Comment Last activity Moderation
tmanmerlin "Here is a view of my split DVD bottom (clear) and my split DVD-R (purple) " | Read more » almost 4 years ago
tmanmerlin "It occurred to me that the DVD I have been using may have been a DVD-R that was burned and published as a DVD. That may explain why It was so easy..." | Read more » almost 4 years ago
tmanmerlin "Although I am having problems with the geometry of the spectrometer, I was able to use a split DVD and get a spectra. No purple. Once I get my sp..." | Read more » almost 4 years ago
tmanmerlin "I split a software DVD and was able to get spectra from it. I asked because I had a question, and the question was, if a regular DVD would produce..." | Read more » almost 4 years ago
Pushpaw "I'm really puzzled as to where you are getting CDs and DVDs you can split. As far as I know all commercial pressed CDs are single layer and so are ..." | Read more » almost 4 years ago
tmanmerlin "Tried to edit my answer. I meant that since my split DVD bottoms didn't have purple, I was concerned they were not usable. " | Read more » almost 4 years ago
tmanmerlin "Just to be clear, If I can effectively split a CD, and get a clear bottom, it is totally usable. I see you are saying that, clearly, but want to b..." | Read more » almost 4 years ago
tmanmerlin "i got lucky on two ol DVD's, they split much easier than the DVD-R I got. I'm just concerned they would not be usable because of some other proper..." | Read more » almost 4 years ago
tmanmerlin "Hi, thanks. I read through this article, it implies that any DVD could be used, assuming it is splitable. But it doesn't specifically state if th..." | Read more » almost 4 years ago
stoft "True, the physical layer aspect is one issue. The other fundamental issue is the 'line spacing' of the recording 'tracks' which form the diffractio..." | Read more » almost 4 years ago
MrBumper "No a DVD is not suitable. The majority of pressed DVDs are single layer, so they cannot be split to expose the (grooves/pits and lands) diffraction..." | Read more » almost 4 years ago
xose "Hi @tmanmerlin and welcome to the publiclab. Find instructions to build the difraction grating here: https://publiclab.org/notes/MrBumper/01-11-20..." | Read more » almost 4 years ago
martin-slavik "Limit of detection is dependent on instrument and method used. Desktop spectrometer works only with visible light, so for detection of substance yo..." | Read more » over 4 years ago
UHF "DVDs work better with smaller track separation and therefore greater diffraction. " | Read more » over 4 years ago
warren "Hi! There are a few posts exploring this question here: https://publiclab.org/questions/dsvilko/06-13-2017/any-way-to-improve-on-the-dvd-grating ..." | Read more » over 4 years ago
amirberAgain "There are two devices I'm familiar with which could be relevant to your question: Nima - uses detection strips for gluten https://nimasensor.com/ ..." | Read more » over 4 years ago
Ag8n "Metals usually take instruments like atomic absorption (AA) or inductively coupled plasma (ICP). These instruments can NOT be done easily on the P..." | Read more » over 4 years ago
JSummers "Hi @nyck31, The short answer to your question is no. The spectrometer will measure light in the visible and perhaps short IR wavelengths. Fentay..." | Read more » over 4 years ago
nyck31 "Hi, I am new to spectometry and was wondering if the spectrometer built with the kit could detect fetanyl in street drugs. In my comp sci class at..." | Read more » over 4 years ago
IvanNik "it would be interested to use Vantablack.. maybe the manufacturer would be willing to donate some considering the purpose " | Read more » over 4 years ago
ICSK "There was no setup. I struggled to get a reading with a fluorite from the Rogerley Mine. This specimen is incredibly bright. The issue probably lie..." | Read more » over 4 years ago
warren "Hi, what does your setup look like? Can you upload a photo of how you're arranging the light and the samples? I've gotten plenty of light while us..." | Read more » over 4 years ago
ICSK "For anyone wishing to know in the future this kit is not adequate for this task. I purchased the Desktop Spectrometry 3.0 Kit after not receiving a..." | Read more » over 4 years ago
amayas "Many thanks Warren for the prompt answer. In fact, I would like to set the exposure time. A friend of mine may help me in doing this, but asked me ..." | Read more » over 4 years ago