tag:blogger.com,1999:blog-1840985738235902482.post4848595178425407972..comments2024-03-27T07:14:48.488-04:00Comments on John the Math Guy: On the nature of emitted light, Part 2John Seymourhttp://www.blogger.com/profile/11350487038873935295noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1840985738235902482.post-43140719777523521082017-04-13T21:13:19.239-04:002017-04-13T21:13:19.239-04:00Thanks for your interest, Anonymous. That is the d...Thanks for your interest, Anonymous. That is the direction that I am heading with this series of blogs. I have a few more posts on background information before I get to that topic!John Seymourhttps://www.blogger.com/profile/11350487038873935295noreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-27064648620548534612017-04-13T19:21:19.124-04:002017-04-13T19:21:19.124-04:00Please do a post someday on CRI. Specifically: I&#...Please do a post someday on CRI. Specifically: I've got a spectrum of a light source. How do I calculate the CRI? Also: I've read that CRI is not acrually the best indicator of color rendering, particularly with spiky sources like fluorescents and LEDs. Yuji, for example, throws a lot data out there beyond that included in CRI (http://www.yujiintl.com/high-cri-led-lighting). What other indexes/standards are there for measuring the color rendering performance of a light source, and how do we calculate those from a spectrum?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-35521913785043447702017-04-13T16:31:59.968-04:002017-04-13T16:31:59.968-04:00I tried to give a quick answer to that, but eviden...I tried to give a quick answer to that, but evidently missed the mark.<br /><br />If I look through a microscope, I have an inherent resolution. I can resolve certain tiny features, but can't resolve anything smaller. Maybe I can resolve the legs and eye facets of a fly, but can't see the hairs on the legs. Maybe I can resolve the scales on the hairs of the legs of the fly. To get better resolution, you need a combination of different optics and more light.<br /><br />So it is with a spectrometer. In the case of my spectro, I can resolve spikes that are about 12 nm apart. This amount of spectral blur is good enough for color measurement, but might not be so good if you were interested in picking out all the emission lines to identify what gases are in the tube.<br /><br />Does this answer the question, or are you looking for a deeper understanding of what limits the resolution in a spectrometer? John Seymourhttps://www.blogger.com/profile/11350487038873935295noreply@blogger.comtag:blogger.com,1999:blog-1840985738235902482.post-53831422366170129112017-04-13T15:28:02.657-04:002017-04-13T15:28:02.657-04:00Fine job as always. In some future blog please exp...Fine job as always. In some future blog please explain why the plot labeled "Emission lines of neon" has such narrow spiky peaks but the plot below it ("My spectrometer looks at neon") has such broad peaks.Anonymousnoreply@blogger.com