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






High-Rez WebCam Spectrometers

by stoft over 2 years ago | 12 | 1,976 views | 3


PLab-3 Proto Slit Upgrade

by stoft almost 3 years ago | 5 | 287 views | 2



Stability upgrade mockup for PLab Spectrometer 3.0

by stoft almost 3 years ago | 13 | 1,007 views | 8


Spectrometer DVD-Alignment Auto-Correction

by stoft about 3 years ago | 0 | 147 views | 0


Spectrometer Peak-Hold

by stoft about 3 years ago | 0 | 165 views | 0


Spectrometer Noise Solution?

by stoft about 3 years ago | 4 | 307 views | 1


Spectrometer Time Filter

by stoft over 3 years ago | 0 | 96 views | 0


Spectrometer Noise

by stoft over 3 years ago | 5 | 168 views | 1


Spectrometer Stability

by stoft over 3 years ago | 9 | 171 views | 3


405nm LED vs Laser

by stoft over 3 years ago | 19 | 1,032 views | 1


CFL Selection

by stoft over 3 years ago | 3 | 247 views | 3


OTK Proto3 Analysis

by stoft over 3 years ago | 5 | 140 views | 2


OTK Proto3

by stoft over 3 years ago | 6 | 490 views | 5


Musings: Spectrometer Stability

by stoft about 4 years ago | 11 | 81 views | 2


PLab 3 Gain Correction

by stoft over 4 years ago | 37 | 464 views | 4


PLab 3 Spectrometer Upgrade Prototype

by stoft over 4 years ago | 11 | 1,077 views | 6


CFL Cal Error Explained

by stoft over 4 years ago | 3 | 154 views | 3


Optimal Slit Width

by stoft over 4 years ago | 0 | 575 views | 2


PLab 3 Sanm Camera Focus

by stoft over 4 years ago | 0 | 136 views | 2


PLab Spectrometer Gain-Correction

by stoft over 4 years ago | 25 | 289 views | 4


PLab's WebCam (Non)Linearity

by stoft about 5 years ago | 0 | 113 views | 3


HDR2: Using Over-Exposure to Your Advantage

by stoft over 5 years ago | 4 | 116 views | 2


HDR: In search of High-er Dynamic Range

by stoft about 6 years ago | 2 | 117 views | 5


What causes spectrum distortion?

nathanathan asked about 6 months ago

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Best light source for spectrometer?

jneish asked about about 1 year ago

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commented on Jul 11, 2018 2

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Why do raw RGB values differ from calibrated RGB values? I thought calibration just set pixels to wavelength (nm)?

troyb asked about about 1 year ago

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Can I use a DVD or does it have to be a DVD-R ?

tmanmerlin asked about about 1 year ago

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can a spectrometer be used to measure color of water ?

thangvu asked about over 1 year ago

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Can I get spatial resolution by making multiple parallel slits?

dgidon asked about over 1 year ago

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Can you get color temperature from spectra

miramon asked about over 1 year ago

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How to interpret the results?

amir129 asked about over 1 year ago

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Is the webcam from spectrometer v2.0 suitable for the upgrade to 3.0?

pablo asked about over 2 years ago

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

warren asked about almost 3 years ago

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What mechanical specs can and should PLab spectrometers meet?

stoft asked about almost 3 years ago

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Spectrometer from a drone

sylvainbonhommeau asked about about 3 years ago

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Question: Can DIY-spectrometer be used for analysis of soil

interestedperson_ha asked about about 3 years ago

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Mini spectrophotometer - how does this deviate from the Beer-Lambert law?

FoxClass asked about about 3 years ago

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Question: Why average? And what happens to the second Green?

viechdokter asked about about 3 years ago

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Question: How do I save the calibration data?

mokeymark asked about over 3 years ago

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Question: What does the vertical scale mean?

someHerrings asked about over 3 years ago

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Question: Spectrometer Desing

Deforme asked about over 4 years ago

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View these maps at MapKnitter.org »

Title Creation date Image

Comments

Comment Last activity Moderation
" Yes, once the camera exposure is under control (and fixed value) then the linearity can be measured -- IF you have controlled means of adjusting t..." | Read more » about 1 month ago
"From that link, I found a 'settings' file here: https://gitlab.com/bath_open_instrumentation_group/picamera_cra_compensation/blob/fdb98308149e686a..." | Read more » about 1 month ago
" Right, the camera's do automate as much as possible, which works against the needs of spectrometers. If the AGC cannot be shut off, then it become..." | Read more » about 1 month ago
" Good work and observations. Yes, I think HDR techniques can help extract additional dynamic range from these simple cameras. In reading through yo..." | Read more » about 1 month ago
"Progress. Right, the likely alignment issue is grating to camera which is notoriously hard to do without having much mechanical control beyond tape..." | Read more » about 2 months ago
" Right ... the optical distances are very small ;-) which is why mechanical rigidity is so important ... (think of the 'optical bench' which is mad..." | Read more » about 2 months ago
" A while back I experimented with some 35mm 'slide-mount' holographic grating film (I believe it was 1200) vs the DVD (which is 740). The diffracti..." | Read more » about 2 months ago
" Looks like a nice clean construction. The glue should help mechanical stability. I did notice the swap from DVD to what appears to be a film holog..." | Read more » about 2 months ago
"Observation of some basic system parameters will help define the limits. 1) A single stable source (Solux and CFL) plus the PLab-class spectromete..." | Read more » 3 months ago
"With non steady-state sources, measurement error results from asynchronous data sampling. The 'fix' is either long integration time (assuming the s..." | Read more » 3 months ago
"Ok, the project concepts are taking shape which always prompts more thoughts. 1) By 2D mapping the light spectrum and relative intensity, you will..." | Read more » 3 months ago
"A few more thoughts... On absolute 'average' intensity - You could use a Solux source (at fixed distance and known orientation) as a transfer stan..." | Read more » 3 months ago
" Ah, I've seen the curve on the web but it was not attributed to the specific sensor. It's helpful to now have that information. It looks like the ..." | Read more » 3 months ago
" Jasmin, glad my previous notes were helpful. I did find one plot for the IMX219, but it was not from Sony and only covered to 700nm. The IMX265 c..." | Read more » 3 months ago
"Interesting project. I did not readily find spectral response curves from Sony on the IMX219 sensor though others in that family of devices appear..." | Read more » 3 months ago
" "The diffraction grating is not perfectly flat" would suggest you are using one of the readily available 35-mm laser holographic film gratings -- ..." | Read more » 6 months ago
"The spectrum of most common halogen lamps is neither smooth nor flat and generally do not have published spectral data. You might consider the Solu..." | Read more » about 1 year ago
"On using only raw data (eg. using the CSV 'avg' data): Yes, you could implement a simple linear mapping of pixel:nm with the data from a CFL spectr..." | Read more » about 1 year ago
"I'll admit I'm not following your comparisons -- but a few thoughts anyway in case they will help. The second plot at least shows a CFL spectra; al..." | Read more » about 1 year ago
"Also, 5 - Use 'absolute' measurement values when mathematically comparing amplitude of spectra -- where the only change between plots is the experi..." | Read more » about 1 year ago
"Ok, visualizing the spectra helps. 1 - The calibration (wavelength calibration using a CFL source) does not require an amplitude change (though SWB..." | Read more » about 1 year ago
"Could not find the actual spectra from the info provided. How about an explicit link or post the graphic? " | Read more » about 1 year ago
"True, the physical layer aspect is one issue. The other fundamental issue is the 'line spacing' of the recording 'tracks' which form the diffractio..." | Read more » about 1 year ago
"Pollution comes in many forms and many of the worst contaminants will not alter the appearance so visible light spectrometers (i.e. PLab types) wil..." | Read more » over 1 year 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 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.



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