Author | Comment | Last activity | Moderation | ||
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stoft | "I'd agree with @gretchengehrke that building awareness of what information data contains, and what information it does not contain, is of primary i..." | Read more » | almost 8 years ago | |||
stoft | "@warren, et. al. Seems my point was missed; this is not a trivial point and it isn't just a matter of scientific notation where measurements are co..." | Read more » | almost 8 years ago | |||
stoft | "@warren, @david-days is right; and in a number of different ways. Yes, the "integrity" of the data is an accurate reference; both legal and scienti..." | Read more » | almost 8 years ago | |||
stoft | "Jeff, Those are really two different questions. 1) Measuring instrument resolution: A) Could use a single, narrow BW laser (if that BW is known to..." | Read more » | almost 8 years ago | |||
stoft | "However ....... 1) the slit-based PLab design does not provide the optical characteristics of field of view like the lens on a camera (and I'm not ..." | Read more » | about 8 years ago | |||
stoft | "It is my understanding that Beer's law is not the relationship between reagent's effect on color, but is the property of light passing through a un..." | Read more » | about 8 years ago | |||
stoft | "@warren has a good point; the smaller the change in transmitted light (as a function of attenuation caused by concentration change) the greater the..." | Read more » | about 8 years ago | |||
stoft | "Unfortunately ..... while photomultipliers respond to many wavelengths, they do not differentiate between wavelengths (they just multiply the elect..." | Read more » | about 8 years ago | |||
stoft | "Hmmm ... all of these signals are so close to each other, I suspect that separating them is not so trivial a task ..... while that application is c..." | Read more » | about 8 years ago | |||
stoft | "On the plots .... seems odd that the 532nm source signal does not appear. Was it removed from the data? If so, how was it's influence on the remain..." | Read more » | about 8 years ago | |||
stoft | "@dhaffnersr, @warren The proposal (above) was for " ...concept for a tunable LED, it is based on a bi-color led, the red and green type, instead i..." | Read more » | about 8 years ago | |||
stoft | "Nope .... each LED has it's own "narrow" (~30nm) BW and so the red, grn and blue LED spectra are all independent - they don't mix and they don't in..." | Read more » | about 8 years ago | |||
stoft | "The Beer-Lambert law primarily states there is a relationship between attenuation and wavelength of light through a substance. The attenuation is l..." | Read more » | about 8 years ago | |||
stoft | "Light sources are both a challenge and the key for many aspects of spectrometer applications. I'd suggest that a "universal light source" isn't an ..." | Read more » | about 8 years ago | |||
stoft | "@warren, @dhaffnersr, Last; first. I do take issue with claims of a negative "impersonal approach" when it intonates that I have not included an e..." | Read more » | about 8 years ago | |||
stoft | "First, ALL displayed plots used for comparison MUST have the same displayed 'X' axes wavelength range .... anything else is just too visually decep..." | Read more » | about 8 years ago | |||
stoft | "@warren, @dhaffnersr Well..... not really ..... The Raman technique requires 1) a very stable (very narrow BW) laser source and 2) a 'matched' ver..." | Read more » | about 8 years ago | |||
stoft | "Well, the 470nm vs 532nm is likely the most important -- the peak in your plot is probably dominated by the source while they reference at 470nm is..." | Read more » | about 8 years ago | |||
stoft | "Ok, additional measurements might help to identify why: 1) the peak center is different, 2) the slopes of the curve "sides" are much steeper (while..." | Read more » | about 8 years ago | |||
stoft | "I'm sorry you found asking questions disrespectful as asking critical questions (questions which are critical to the analysis process) are just par..." | Read more » | about 8 years ago | |||
stoft | "Can the value of this dissimilar comparison be explained? Not only are the peaks different by 9nm ( a substantial discrepancy ) but the spectral cu..." | Read more » | about 8 years ago | |||
stoft | "Yes, both aluminum and silver oxidize very rapidly which is why all mirrors with those surfaces are coated -- the type of coating affects the mirro..." | Read more » | about 8 years ago | |||
stoft | "@cristoforetti, the camera focal distance is based on using a slit to simulate collimated light -- non-collimated light gives multiple diffraction ..." | Read more » | about 8 years ago | |||
stoft | "But that was part of my point -- the camera does 'raw-capture' processing on the sensor's 12-14bit detector data before it gives you the 'raw' data..." | Read more » | about 8 years ago |