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drmkn.bsky.social @drmkn.bsky.social · 23/10/2025

Call for data for survey of CCD spectrometers. Do you have a CCD spectrometer? If you do, would you please collect two fluorescent lamp spectra and send me the data in ascii format. One with the 546nm just a little bit below saturation and another at about 1/4 of that intensity. Thank you.

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drmkn.bsky.social @drmkn.bsky.social · 23/10/2025

Wonderful, do you happen to have access to an Avantes spectrometer? I am collecting examples of fluorescent spectra.

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drmkn.bsky.social @drmkn.bsky.social · 21/10/2025

TCD1304 or S11639-01 Why you might choose the TCD1304 over the S11639-01 in most instances. 1) TCD1304DG $18 on Digikey, vs $200 to $450, and not found even on octapart. 2) Response spectrum, S11639-01 left, TCD1304DG right - self explanatory.

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drmkn.bsky.social @drmkn.bsky.social · 20/10/2025

His circuit is discussed in my repo for the new instrument. Have you read it? Anyway, the main point is about reproducibility. I could use some help getting the news out.

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drmkn.bsky.social @drmkn.bsky.social · 19/10/2025

This is also a challenge to all of the linear CCD projects, and for any commercial instrument you use: Before you acquire and/or use any spectrometer for work you plan to publish, you should insist on seeing a fluorescent lamp spectrum and linearity data in graphical form as shown in the repo below

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drmkn.bsky.social @drmkn.bsky.social · 19/10/2025

For any CCD spectrometer you see anywhere, if they have not posted a fluorescent light specrum, dont touch it. And if they did post the spectrum, take a look at the strong sharp lines. If the ratios of heights in nearby peaks is off, then assume that the instrument has an electrical problem.

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drmkn.bsky.social @drmkn.bsky.social · 19/10/2025

Read the repo readme. Look at the graphs. Everybody who has used these, has noticed this - since they first appeared in the '90s I happen to be an instrumentation physicist, I decided enough is enough and invested some effort and post one that really works.

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drmkn.bsky.social @drmkn.bsky.social · 17/10/2025

No, they are not viable. There is a huge difference between getting a signal and getting a spectrum that is reproducible. See this github.com/drmcnelson/T...

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drmkn.bsky.social @drmkn.bsky.social · 17/10/2025

I am working on a few. We are calling our project Open Instruments for Open Science. Here are two examples. A third design, photon tagging is ready for build and we are updating a few more to add to the repos. github.com/drmcnelson/T... github.com/drmcnelson/L...

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drmkn.bsky.social @drmkn.bsky.social · 16/05/2025

@ninatotenberg.bsky.social SOTUS 120 yrs ago, ruled that 14th amendment applies to everyone born in the US? Cite, please? Elk v Wilkins 1884 "and subject to the jursidiction thereof" excludes Indian reservations Remedied in the Indian Citizenship Act of 1924 en.wikipedia.org/wiki/Elk_v._...

en.wikipedia.org

Elk v. Wilkins - Wikipedia

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drmkn.bsky.social @drmkn.bsky.social · 24/04/2025

No, it was a stunning failure of basic academic standards. Taking a position, in public no less, based on biased, unvetted and in some instances debunked data, *should* be grounds for termination for faculty. That students do it en masse, with faculty support, all the more so.

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