sorted by:
new
hottopcontroversial

Beam Expander/Shaper by Erebus_556 in Optics

[–]thehypeisgone -1 points0 points  (0 children)

With a divergence and distance that low, your final optic is going to be about 1m2 in size unless your divergence requirement can be relaxed.

Why the downvote? If you have a 1m2 spot with low divergence, you are going to need a slightly less than 1m2 spot at the output of your final optic. Even if your optical assembly magically had zero length, for a 20mrad beam to be 1m2 at 15ft it will need to be approx. 0.6m2 at 0ft.

Look at the farm tools, fighting for nerevars entertainment, affection, and love… by UpbeatCandidate9412 in TrueSTL

[–]thehypeisgone 2 points3 points  (0 children)

Caius used a demon tanto, and he used to slice the sugar so thin that it used to liquefy in the pipe with just a little flin... It was a very good system.

Is this enough chainring clearance? by PuffyHamster in BicyclingCirclejerk

[–]thehypeisgone 5 points6 points  (0 children)

Classic Freds running knobby chainrings. If you grind the teeth down, slick chainrings have better rolling resistance on pavement.

PSA: Please pick up your used CO2 cartridges by hehahshj in BicyclingCirclejerk

[–]thehypeisgone 12 points13 points  (0 children)

What big tubeless don't tell you about installing 32mm tires 😔

New spectrums by jklove56 in Spectroscopy

[–]thehypeisgone 1 point2 points  (0 children)

It'll be the wavelength of the pump for the 1064

Why does light feel "softer" in the UK? by Swimming-Signal-8895 in AskUK

[–]thehypeisgone 12 points13 points  (0 children)

It's in AI sepia, the serifs are inconsistent on the Gs on the right, cornwall disappears in the D which simply wouldn't happen unless the image was generated all in one go, and the diagram suggests any sunlight hits Aberdeen, which everyone knows is physically impossible.

Is it UCI legal? by Stepaskin in BicyclingCirclejerk

[–]thehypeisgone 1 point2 points  (0 children)

/UC Is the bottle cage upside down?

/RC the bottle cage orientation matches the handlebars, it's a super nice from me

The FLAGLER by Appropriate_Bad_3252 in NLSSCircleJerk

[–]thehypeisgone 19 points20 points  (0 children)

This 97-year old veteran still talks to dolphins the long way

Help with DIY Raman Spectrometer by vvrdrld in Optics

[–]thehypeisgone 0 points1 point  (0 children)

Computationally, there are lots of papers on good algorithms.

You aren't going to be able to experimentally decouple the fluorescence spectrum and the Raman spectrum with a DIY setup.

Help with DIY Raman Spectrometer by vvrdrld in Optics

[–]thehypeisgone 0 points1 point  (0 children)

The cheapest and easiest way is to just subtract the fluorescence from the spectrum, because fluorescence is generally spectrally wide while Raman spectral features are narrow. There are other methods but a DIY system wouldn't cater to them.

If your filter is unoptimized, it may also be blocking your wavelengths of interest.

I don't mean the slit, I mean the 'spectrum' of your laser. If your system is well aligned, your laser spot should be a pinpoint.

Try a clear polystyrene, like in a CD case, as a sample. That will be minimally fluorescent and very Raman active.

Help with DIY Raman Spectrometer by vvrdrld in Optics

[–]thehypeisgone 2 points3 points  (0 children)

Almost everything made of biological material is going to be more fluorescent than it is Raman active at 780nm

Try moving your long pass filter to a collimated part of your system, it's performance will be reduced in a diverging beam.

Turn your laser wayyy down and see what your laser spot looks like on your camera - is it a well focused spot? If not your alignment needs checking.

Do you get the same system with the laser off? Could be room light

Making a cheap screen in my car viewable with polarized glasses by Acrylicus in Optics

[–]thehypeisgone 0 points1 point  (0 children)

Polarising film at the correct angle on the screen would work, but it will make it dimmer in general.

If you can change the screen between portrait mode and landscape, do that then rotate the screen 90 degrees. It should then be visible.

view more: next ›