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





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"Hey Jeff, I use spekwin32 for all my spectral data processing, first here are 2 references that may help you https://www.researchgate.net/topic/uv..." | Read more » over 3 years ago
"Hey @ethanbass, more so, I mean modulating the intensity by means of PWM, although there is a temperature wave length correlation in LEDs, example:..." | Read more » over 3 years ago
"Hey Jeff, I saw your spectra of the nail polish machine and there it is the tell tail "hump," so I exported it and processed it and here is what it..." | Read more » over 3 years ago
"Hey Dave, well I was thinking along the lines of when I built a wind speed indicator with a small dc motor and LCD screen attached and calibrated i..." | Read more » over 3 years ago
"dave stoft did a great analysis with different oils https://publiclab.org/notes/stoft/01-26-2016/otk-proto3-analysis and to me it seems to concure..." | Read more » over 3 years ago
"Hey Jeff, unfortunately with refined oil the organic chemistry aspect gets changed dramatically, thats why when you shine a UV flashlight or laser ..." | Read more » over 3 years ago
"Correction for graph number 2, it says :"data from March 9th" it should say:"data from March 10th" sorry " | Read more » over 3 years ago
"Hey Jeff! Yes I will file that bug report. I think as far as repeatability results go, your idea is a logical way to go, I'm just concerned when da..." | Read more » over 3 years ago
"Hey Jeff! Sure I'd be happy to test any LEDs you want to send. I do want to throw an idea your way, I think using the higher wavelength LEDs are st..." | Read more » over 3 years ago
"You are correct, it is difficult to keep the hardware parameters the same everytime, I was checking out your prototype spectrometer and the design ..." | Read more » over 3 years ago
"Hey Jeff! No problem at all, I am retired (a lot of time but no were to go!) All the LEDs are numbered so it's just a matter of setting the experim..." | Read more » over 3 years ago
"Hey Dave! I don't know either about the higher signal level at the 406nm peak. That makes sense about testing the acrylic and quartz together, I kn..." | Read more » over 3 years ago
"I did NOT award myself!! I don't know what happened there. " | Read more » over 3 years ago
"Hey Guillaume851, yeah, I have been using spekwin32 for several months now and once you start getting the hang of it it is easy to use and very eff..." | Read more » over 3 years ago
"Hey Jeff! Yes they were all from the same company (superbrightled.com) here is the part number - # RL5-UV0430-400. Originally I bought 10 LEDs but ..." | Read more » over 3 years ago
"Hey Jeff, I thought I had some high brightness LED's, I can't find them right now but I did have a RED LED clear top 1.7v@20mA 3000mcd@ 12deg viewi..." | Read more » over 3 years ago
"Hey Jeff, your right I just thought about it, it will calibrate, it's just you can't get a good fit. " | Read more » over 3 years ago
" Above you can see both blue bands of the CFL daylight and non-daylight bulbs. Above are the green bands of both the daylight and non-dayligh..." | Read more » over 3 years ago
"Hello Matej! Those "humps" that you are getting from the daylight bulbs are the very reason I don't use them, that continuous band on the blue spec..." | Read more » over 3 years ago
"here is a picture of a 3W LED mounted on a heatsink and an optional focal lens, this LED's wavelength is 410nm-465nm. 11401.Jpg 13779.Jpg " | Read more » over 3 years ago
"Hey Jeff, yeah that's an ultra-brite LED (high current/high-flux output.) it's just mounted on a heat sink assmbly. I have a few of those, but the..." | Read more » over 3 years ago
"Here is where you can buy 395nm UV LED's for $1.40 a piece. http://www.allelectronics.com/make-a-store/item/uled-2/ultraviolet-led-395-nm-30-degre..." | Read more » over 3 years ago
"Here is the Peak and FWHM data for both the 395nm and 405nm readings: PEAK DATA UV laser 405nm 1) Isopropyl alcohol wavelength [nm] absorbance ..." | Read more » over 3 years ago
"Hey Jeff, glad you found this useful, I believe the baseline noise is caused by the extra cell length (the glass test tubes are 2.05cm.) I am waiti..." | Read more » over 3 years ago

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



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