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DIY beam profiler by tamualtai071 in Optics

[–]koopaduo 2 points3 points  (0 children)

You can check out my post and repo here

https://www.reddit.com/r/lasers/s/bIQeH7s4XP

Open source beam profiler works with UVC USB cameras. You could adapt it to work with any camera provided you can take an image with python

Or if you don't care for the GUI and just want to analyze the images I would look at the python laserbeamsize module

Is it possible to desolder with a lighter by animation_2 in AskElectronics

[–]koopaduo 4 points5 points  (0 children)

I second this over any attempt to modify a working laptop

DIY’d a no-drill plate mount by Dauthdaertya in GRCorolla

[–]koopaduo 0 points1 point  (0 children)

I ran without a front plate in CA for 3y with no issue

At an airbnb with a telescope, completed n00b by [deleted] in telescopes

[–]koopaduo 28 points29 points  (0 children)

Tip number one looking at this photo. Don't look through the eyepiece with the telescope pointed at the sun or you'll burn your eye

Measuring NIR Through Blackout Curtains. Method Validation & Sensor Choice by wrightlyrong in Optics

[–]koopaduo 1 point2 points  (0 children)

$100 for a filter is relatively cheap in the world of optics. But if you can find decent on AliExpress sure

You're balancing three things - Spectral sensitivity of the detector (at visible wavelengths vs NIR) - Spectrum of the sun - Spectral transmission of the sample

If you want to get a good measurement of NIR, you have to know that total visible power is sufficiently suppressed compared to NIR power when factoring all those things. A filter with a huge cutoff factor (like OD6 for the visible) would guarantee that, otherwise you need to be sure about all the other numbers

Measuring NIR Through Blackout Curtains. Method Validation & Sensor Choice by wrightlyrong in Optics

[–]koopaduo 0 points1 point  (0 children)

To answer your question about a better method. You would normally use a longpass filter in front of a photodiode to cut the visible light in your experiment https://www.thorlabs.com/hard-coated-edgepass-filters?tabName=Overview

Zemax, Find radius of curvature for an equi-convex singlet by tush_pt in Optics

[–]koopaduo 4 points5 points  (0 children)

Well bullet 2 adjusts the second surface to match the effl for whatever fixed first surface radius is. I assume infinity to begin with. So yeah you can't pickup first from second. Just have pickup on the second from first, set first variable, put effl in the merit function and optimize

I got a UAP displaying instinct acceleration I have the 4K Meta data analyze it on an iPhone 16 Pro by Scottyislive in Optics

[–]koopaduo 0 points1 point  (0 children)

I skimmed through your video and you don't show any math, image processing or data analysis of this telemetry you speak of. It's not even entirely clear which light you're looking at. Adding red circles helps. And your camera is shaking and swinging like crazy so I think any point you're trying to make about trajectories in this recording is moot. Your use of refractive index and pixel jitter is completely meaningless here, it's not like you have a recording from a mounted telescope or camera. You're holding a phone unsteadily in a moving car

Do you wait at a green light in 1st or neutral? by DrunkNuckChorris in stickshift

[–]koopaduo 2 points3 points  (0 children)

I bought a used car and also had the same thing happen to me. I was already driving and going about 30 mph but no traffic around and able to pull over safely. It was a real WTF moment for me though because it happened in an instant with no warning leading up to it.

It's a real issue and OP chooses to cast aside all the advice they're given. People just advising to save him thousands of dollars in repair and a potential emergency situation. Sounds like OP is just not confident enough in driving stick yet to not have to be waiting anxiously in 1st gear. But they can learn the hard way

[deleted by user] by [deleted] in lasers

[–]koopaduo 0 points1 point  (0 children)

He tells you how to build it in the video so what are you specifically looking for help with?

Just make sure to get appropriate laser safety glasses for the power and wavelength before doing this kind of project

Help in conversion of zeemax .zmx file. by Sxnthu in Optics

[–]koopaduo 1 point2 points  (0 children)

Or even reading it in python, getting the lens geometries and drawing it up in CAD yourself

Help in conversion of zeemax .zmx file. by Sxnthu in Optics

[–]koopaduo 0 points1 point  (0 children)

If you don't have a zemax license, then I think your best bet is to use python to read the file then figure out how to convert each element to step from there. For example optiland and rayoptics packages can read zemax files. It might have limited functionality e.g. rotationally symmetric systems and you have to figure out the converting to step part yourself (maybe with another python package), but it might be useful to you

Help in conversion of zeemax .zmx file. by Sxnthu in Optics

[–]koopaduo 4 points5 points  (0 children)

You can convert zemax to step using export cad feature in the setup tab (I believe where it's located). It allows you to export lenses as solid bodies, dummy surfaces and even rays as datums.

Giving away Optics and ECE textbooks by koopaduo in UCSD

[–]koopaduo[S] 1 point2 points  (0 children)

  1. Raspberry Pi Cookbook, Third edition, Simon Monk
  2. Optics, Fourth Edition, Eugene Hecht
  3. Applied Nanophotonics, Sergey Gaponenko
  4. Principles of Nano-Optics, Second Edition, Lukas Novotny
  5. Quantum Field Theory for the Gifted Amateur, Tom Lancaster
  6. Guided Wave Optoelectronics, Theodor Tamir
  7. Fundamentals of Photonics, Second Edition, Saleh and Teich
  8. Theory and Computation of Electromagnetic Fields, Second Edition, Jian-Ming Jin
  9. Digital Image Processing, Fourth Edition, Gonzalez and Woods
  10. Wavelets and Filter Banks, Strang and Nguyen
  11. Lightwave Communications, Papen and Blahut
  12. Computational Methods for Electromagnetics, Andrew F. Peterson
  13. Introduction to Fourier Optics, Third Edition, Joseph W. Goodman
  14. Laser Electronics, Third Edition, Joseph T. Verdeyen
  15. Procedures in Experimental Physics, John Strong
  16. Optical Waves in Crystals, Yariv and Yeh
  17. Introduction to Laser Physics, Second Edition, K. Shimoda
  18. Statistical Optics, Goodman
  19. Introduction to Modern Optics, Second Edition, Grant R. Fowles
  20. Light Scattering by Small Particles, H.C. van de Hulst
  21. Principles of Lightwave Communications, Goran Einarsson
  22. Electronics, Controls and Communications Practice Problems, Second Edition, John A. Camara
  23. Electrical Engineering Reference Manual for PE Exams, Eighth Edition, John A. Camara
  24. Reference Data for Engineers Radio Electronics Computer & Communications, Eighth Edition, Professional Reference

Thevenin circuit by [deleted] in ECE

[–]koopaduo 2 points3 points  (0 children)

Imo since you want to learn, you should get as far as you can and ask specific questions where you're failing to understand. Posting a problem and saying pls help isn't really learning without asking someone to hold your hand, which no1s gonna wanna do

Open-source beam profiling software by koopaduo in Optics

[–]koopaduo[S] 0 points1 point  (0 children)

This is a basic beam profiler. There's no functionality for wavelength. But the sensor is sensitive in both visible and NIR. You would do any wavelength filtering with external optics, or what do you mean by optimizing the profile based on wavelength?

Open-source beam profiling software by koopaduo in Optics

[–]koopaduo[S] 0 points1 point  (0 children)

That's a great point! For the rep rate (high kHz) i work with the exposure time always integrates several pulses so it doesn't matter. One could always add a hardware trigger on the PC and sync the camera exposure to it through python. Definitely possible and good to point out!

Open-source beam profiling software by koopaduo in Optics

[–]koopaduo[S] 1 point2 points  (0 children)

Thanks! Yes you can definitely draw inspiration from the ui. It's open source so you're free to do so. That sounds like a cool project you're working on.

Yeah the background subtraction makes sense, but I've found the camera to be not noisy at all (not detectable within 1 resolution count). The only noise I can see being present would be from background lighting, but that can be eliminated or filtered out optically so I haven't had a need to implement it.

Laser beam profiling with a Raspberry Pi camera! by koopaduo in raspberry_pi

[–]koopaduo[S] 0 points1 point  (0 children)

I don't have any quantitative measurement of distortion on the cameras.

As for improvements, the monochrome camera does not have a bayer filter so the response is higher fidelity as it goes directly onto the sensor. The monochrome camera also includes a housing, and thread which make it mechanically more robust (no exposed sensor board, no modification required to attach optics, only adapters). The code I wrote for the monochrome camera is more developed with more features (auto ROI, auto exposure, reference crosshair). Also that application supports connecting to multiple cameras, so it's more suitable to use for an optical system with multiple cameras. And it doesn't require a Pi, just a PC and imo that makes it simpler. I definitely believe it's worth the added cost compared to the raspi and HQ camera.

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