MrBumper 3 research notes and 3 wiki edits | Joined over 4 years ago

I am a technical journalist, ebook author, cyclist and guitar builder.








My experience of building and using a spectrometer based on the Public Lab design

by MrBumper over 4 years ago | 7 | 2,353 views | 1


Can I use a DVD or does it have to be a DVD-R ?

tmanmerlin asked about about 1 year ago

Answers

answered on Jun 10, 2018 0

answered on Jun 10, 2018 0

answered on Jun 10, 2018 0

answered on Jun 26, 2018 0

answered on Jun 26, 2018 0

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Comments

Comment Last activity Moderation
"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 » about 1 year ago
"Sigh! well I wondered why I hadn't come across 'daylight' halogen before. It's cos they don't seem to be available in the UK, at least the Solux la..." | Read more » over 4 years ago
"I've just looked at the Solux lamps. As far as I can see they are halogen lamps with built in blue filters. What a great find. I've tried daylight..." | Read more » over 4 years ago
"This does look very promising. How was your spectrometer set up - blue dye removed from DVD-R grating ? (assuming you used a DVD-R), IR filter remo..." | Read more » over 4 years ago
"I'm wondering if you took any account of the web camera settings - in particular colour temperature / white balance. This has quite a large effect ..." | Read more » over 4 years ago
"I'd really like a stand alone version so I can store, organise and delete captured data and take measurements without an internet connection. If at..." | Read more » over 4 years ago
"You make some great points there. It seems to me that it is difficult to keep what may be valid experimental results, separated from rough tests, "..." | Read more » over 4 years ago
"Matthew - I found that static soaking helps soften the dye. But then the dissolved dye just sits in solution above the surface of the DVD-R fragmen..." | Read more » over 4 years ago
"Thanks Matthew, that's good to know. I suppose the IR response might be better if both the lens filter and the dye on the grating weren't present. ..." | Read more » over 4 years ago
"Following my repeat experiment I have been thinking about the IR response of the PL spectrometer. I haven't been that concerned about it because it..." | Read more » over 4 years ago
"Thank you very much. I'm sorry if my initial response seemed overly protective of my results. I hope I don't wind up like Fleischmann and Pons ! I ..." | Read more » over 4 years ago
"OK but my intention was not to measure inaccuracy / repeatability in the wavelength measurement, or highlight any errors in the Spectral Workbench ..." | Read more » over 4 years ago
"The "squeezing" referred to in the previous comment is, I believe, actually a result of the way that Spectral Workbench uses the two reference poin..." | Read more » over 4 years ago
"Nice "out of the box" on the Spec 3 Stevie. You might find my research note - http://publiclab.org/notes/MrBumper/01-11-2015/preparing-a-dvd-r-to-a..." | Read more » over 4 years ago
"Matthew I'm a bit baffled by your reply to my previous comment. You picked the Sanm Tech specifically because exposure control was implemented ......." | Read more » over 4 years ago
"As far as I know the guide groove on a DVD+R would be indistinguishable from that on DVD-R as far as using it for a diffraction grating is concerne..." | Read more » over 4 years ago
"Well I have tried the Sanm camera 'popsickle' stick camera with various control utils. There is absolutely no sign of an exposure control Matthew. ..." | Read more » over 4 years ago
"I'm not at all sure you can measure what you seem to be talking about, or at least not in the way you seem to be going about it. As far I know the ..." | Read more » over 4 years ago
"I don't know if this will clarify anything, but I'm finding using a laser beam from a red laser pointer quite useful in examining what goes on with..." | Read more » over 4 years ago
"Hi Chris, Thanks for the tip on dark material and your findings on grating orientation. The internet really is killing bricks and mortar retail, I ..." | Read more » over 4 years ago


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