Comments

Author Comment Last activity Moderation
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 » over 7 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 » over 7 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 » over 7 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 » over 7 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 » over 7 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 » over 7 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 » over 7 years ago
stoft "Unfortunately ..... while photomultipliers respond to many wavelengths, they do not differentiate between wavelengths (they just multiply the elect..." | Read more » over 7 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 » over 7 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 » over 7 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 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 » almost 8 years ago