Comments

Author Comment Last activity Moderation
MrBumper " I seem to remember the web site app does not cope well with two cameras. If you can find a software toggle on your system (you may even need to go..." | Read more » over 1 year 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 » over 2 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 5 years ago
MrBumper "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 » almost 6 years ago
MrBumper "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 » almost 6 years ago
MrBumper "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 » almost 6 years ago
MrBumper "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 » almost 6 years ago
MrBumper "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 » almost 6 years ago
MrBumper "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 » almost 6 years ago