stoft 28 research notes and 28 wiki edits | Joined about 6 years ago






High-Rez WebCam Spectrometers

by stoft over 2 years ago | 8 | 1,247 views | 1


PLab-3 Proto Slit Upgrade

by stoft over 2 years ago | 5 | 513 views | 2




Spectrometer DVD-Alignment Auto-Correction

by stoft about 3 years ago | 0 | 965 views | 0


Spectrometer Peak-Hold

by stoft about 3 years ago | 0 | 746 views | 0


Spectrometer Noise Solution?

by stoft about 3 years ago | 4 | 1,329 views | 1


Spectrometer Time Filter

by stoft about 3 years ago | 0 | 721 views | 0


Spectrometer Noise

by stoft about 3 years ago | 5 | 1,160 views | 1


Spectrometer Stability

by stoft about 3 years ago | 9 | 815 views | 3


405nm LED vs Laser

by stoft over 3 years ago | 19 | 2,167 views | 1


CFL Selection

by stoft over 3 years ago | 3 | 1,425 views | 3


OTK Proto3 Analysis

by stoft over 3 years ago | 5 | 1,405 views | 2


OTK Proto3

by stoft over 3 years ago | 6 | 1,720 views | 5


Musings: Spectrometer Stability

by stoft almost 4 years ago | 11 | 1,912 views | 2


PLab 3 Gain Correction

by stoft over 4 years ago | 37 | 3,477 views | 4


PLab 3 Spectrometer Upgrade Prototype

by stoft over 4 years ago | 11 | 4,131 views | 4


CFL Cal Error Explained

by stoft over 4 years ago | 3 | 1,726 views | 2


Optimal Slit Width

by stoft over 4 years ago | 0 | 3,040 views | 2


PLab 3 Sanm Camera Focus

by stoft over 4 years ago | 0 | 2,073 views | 2


PLab Spectrometer Gain-Correction

by stoft over 4 years ago | 17 | 61 views | 4


PLab's WebCam (Non)Linearity

by stoft about 5 years ago | 0 | 3,577 views | 4


HDR2: Using Over-Exposure to Your Advantage

by stoft over 5 years ago | 3 | 3,035 views | 1


HDR: In search of High-er Dynamic Range

by stoft about 6 years ago | 2 | 4,088 views | 3


How can I reduce ambient light inside the Desktop Spectrometry Starter Kit?

Accepted

warren asked about over 2 years ago

Answers

answered on Sep 19, 2016 0

answered on Sep 20, 2016 1

answered on Sep 20, 2016 0

answered on Sep 20, 2016 0

answered on Sep 22, 2016 1

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What mechanical specs can and should PLab spectrometers meet?

stoft asked about almost 3 years ago

Answers

answered on Sep 15, 2016 0

answered on Sep 16, 2016 0

answered on Sep 16, 2016 0

answered on Sep 16, 2016 1

answered on Sep 16, 2016 1

answered on Sep 20, 2016 0

answered on Sep 20, 2016 0

answered on Sep 20, 2016 0

answered on Sep 20, 2016 0

answered on Oct 01, 2016 0

answered on Oct 17, 2016 0

Show all 11 answers »

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Comments

Comment Last activity Moderation
"IMHO, the 2-angle configuration was simply derived through mechanical tinkering. It seemed to work and so was subsequently measured and documented ..." | Read more » almost 2 years ago
"There's still some clipping (source light intensity too high) so a comparison, using a cardboard mask (with a small hole in it), between the two bu..." | Read more » over 2 years ago
"No I don't think it is just inherent in the camera. The blue led has a fairly narrow spectrum (say 25nm at most) so producing a 150nm 'spread' woul..." | Read more » over 2 years ago
"I note that 1) your spectrum does "fit" though it is 2) "offset" a bit from center which is likely related to the angle. (Just to identify what is ..." | Read more » over 2 years ago
"The angle is a function of (mathematical) of the detectable wavelength range and the diffraction grating (DVD) line spacing. My calculations and my..." | Read more » over 2 years ago
"@stef, thanks for the curve data. While the data is useful for comparison with relative sensitivity curves of other cameras, the data, unfortunatel..." | Read more » over 2 years ago
"What I've read is that the RPi camera used to use the OV5647 camera chip but has "upgraded" (changed chips) to a Sony IMX 219 PQ CMOS image sensor ..." | Read more » over 2 years ago
"Jeff, I inserted the component details in the note above, just before the plots. As to the RPi camera, it seems to have two "difficulties" which n..." | Read more » over 2 years ago
"Jeff, yes, the data is being collected, and yes, higher resolution does improve observation of detail like slit differences. I'm evolving some new ..." | Read more » over 2 years ago
"Jeff...Actually, looking at the 'Unreinforced' 'Green' peak wavelength shift, the span is 537-549nm (the same peak in the 'reinforced' version is 5..." | Read more » over 2 years ago
"I'd guess that it's just the collection and comparison of key measurements extracted from the spectra which may result in 'sensitivity' estimates. ..." | Read more » over 2 years ago
"Jeff - hands-on experiences are usually helpful even if incomplete. You could tinker with the paper-n-tape process even if there are not enough hou..." | Read more » over 2 years ago
"Thanks Jeff; understood. I'm presently working on a higher resolution P-4 spectrometers (including monochrome) so might find a spot for comparison ..." | Read more » over 2 years ago
"@warren, I posted some draft note on testing to: https://publiclab.org/questions/stoft/09-15-2016/what-mechanical-specs-can-and-should-plab-spectro..." | Read more » over 2 years ago
"@warren, I didn't see you comment about a draft of test types for replication experiments so I just posted them at the end of this published note o..." | Read more » over 2 years ago
"@warren, I'm not sure I follow the linking details for grids etc., but more abstractly, a tree structure comes to mind. This note describes one com..." | Read more » over 2 years ago
"@warren, the black ink looks quite dark in the photo and seems easy to apply. Hope it cures well. I believe the primary factors are 1) the black c..." | Read more » over 2 years ago
"@abdul, ok so we've just differentiated the [1] and [2] kits; the option [1] should ship thin, paper only with no 'solid' materials other than the ..." | Read more » over 2 years ago
"Interesting thought. I'll suggest using blue and red LEDs which then allows monitoring apparent wavelength shifts as well (when slit and camera or ..." | Read more » over 2 years ago
"@abdul, interesting observations .... so here's a starter list. [0] Folding Vers (Cute, zero-cost, spectrum concept), [1] Paper Vers (Functional, l..." | Read more » over 2 years ago
"@warren, nice to see a design from the West suddenly appear in the East! Sneaker-net variant of NC machining; hope the design actually works for yo..." | Read more » over 2 years ago
"@mathew, good thoughts. I'm technical but from experience I see the need to include the market, user, next-bench, test, manufacturability, environm..." | Read more » over 2 years ago
"@abdul, I'd not consider superglue because of it's negative properties for human skin -- a safety hazard. Remember, the kits are sold for education..." | Read more » over 2 years ago
"The size of the 'square' parts is close to 0.5-in but the "ideal" value is set by the "height" of the camera lens after the camera is mounted. The ..." | Read more » over 2 years ago

stoft was awarded the Basic Barnstar by warren for their work published in PLab Spectrometer Gain-Correction.


stoft was awarded the Basic Barnstar by warren for their work published in PLab 3 Gain Correction.


stoft was awarded the Basic Barnstar by liz for their work published in PLab 3 Spectrometer Upgrade Prototype.


stoft was awarded the Basic Barnstar by dhaffnersr for their work published in Optimal Slit Width.


stoft was awarded the Empiricism Barnstar by warren for their work published in PLab 3 Sanm Camera Focus.


stoft was awarded the Empiricism Barnstar by warren for their work published in OTK Proto3 Analysis.


stoft was awarded the Empiricism Barnstar by warren for their work published in Spectrometer Noise.


stoft was awarded the Empiricism Barnstar by Matej for their work published in OTK Proto3.


stoft was awarded the Photo Documentation Barnstar by dhaffnersr for their work published in OTK Proto3.


stoft was awarded the Photo Documentation Barnstar by dhaffnersr for their work published in CFL Selection.



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