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dhaffnersr 107 research notes and 158 wiki edits | Joined over 3 years ago





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"Correction to previous post: I said "in series to increase current." oops, I meant in parallel to increase current. Sorry. Typing too fast. " | Read more » about 3 years ago
"I had to redesign a few aspects of this circuit, so I posted the new design pics. The LED was running too hot, even with the heat sink, so what I d..." | Read more » about 3 years ago
"Hey Jeff, that sounds great, I'm waiting on some disposable UV cuvettes I ordered they should be in monday (I'm tired of cleaning the quartz one's!..." | Read more » about 3 years ago
"Hey Jeff, I used the green laser (532nm) because of the excitation wavelength of rhodamine b, which is about 543nm, that's why I displayed the exci..." | Read more » over 3 years ago
"Here are some up close pics of the cuvette holder, yesy it is really ugly but it is in the "proof of concept" phase: The way it is designed I can..." | Read more » over 3 years ago
"Hey pdhixenbaugh, I was running this test because I know that glass can absorb UV radiation and the quartz cuvettes are suppose to let UV light pa..." | Read more » over 3 years ago
"Hey Jeff, here are a few pics of what I got going now; I think that's pretty good fluorescence " | Read more » over 3 years ago
"Hey Jeff, I figured out what was wrong, I redesigned the cuvette holder and shot the laser through at a perpendicular angle here is a set I did wit..." | Read more » over 3 years ago
"Hey mlamadrid, the "freezing" method can work as long as you you drop the temp down to -20C, or you can use a clevenger apparatus, which is a gla..." | Read more » over 3 years ago
"Hey Dave, just wanted to show ya I got a fit of 4 today on my CFL calibration https://spectralworkbench.org/spectrums/74468# CFL calibration mar1..." | Read more » over 3 years ago
" Hey Dave, here are some more screen shots from spekwin32 and the methylen blue work I have been doing, just thought you would be interested. Hav..." | Read more » over 3 years ago
"Hey Dave, I got those cuvettes from researching the different properties and their function, but I understand what your saying about the narrow gap..." | Read more » over 3 years ago
"Thanks for replying Dave, yes I should have stated more clearly that the LEDs, if they were causing fluorescence then as you stated, it's buried in..." | Read more » over 3 years ago
"Hey everyone, this is part3 of what I am using for data processing this is spekwin32: " | Read more » over 3 years ago
"Also as a quick aside, from all the spectra that I have taken (and they are many,) it is starting to seem that perhaps this spectrometer kit as it ..." | Read more » over 3 years ago
"Hey Guillaume851, that's good, I like a sense of humor, so try and keep up here, number 1, I use a data program called spekwin32 to process the sp..." | Read more » over 3 years ago
"This is Part two " | Read more » over 3 years ago
"Ok Jeff, here are the pictures of my set up as it stands now: " | Read more » over 3 years ago
"Hey Jeff, I know, there is NO fluorescence, I tend to agree with Dave, I think the LEDs just don't have the intensity to cause the type of fluoresc..." | Read more » over 3 years ago
"Hey Guillaume851. here is the equation I use: A=log10(IoI)=ϵlc " | Read more » over 3 years ago
"Hey dave, for some reason the snr data is all messed up and out of line so I'm just going to write it out so it can be clear: signal-180 shot nois..." | Read more » over 3 years ago
"Hey Dave, thank you so very much for your analysis and input, I do have a few questions for you though first, I know that you are using a Sanm CM-0..." | Read more » over 3 years ago
"Again, I DID NOT award myself this barnstar! Honest! " | Read more » over 3 years ago
"It's me again Jeff, Dave H, sorry I posted the wrong graph i made, this is the right one " | Read more » over 3 years ago

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  • skill:electrical
  • skill:engineer
  • skill:optics
  • skill:fiber
  • skill:splicing
  • skill:electronic
  • skill:chemistry



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