DVD Grating
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- Опубликовано: 16 апр 2019
- Safe and Easy Way To Prep DVD as Diffraction Grating
In my experiments with doing spectroscopy with a drone, I needed a safe good way to prepare DVD disks which can be used as a diffraction grating in a small foldable mini spectrometer.
This is Part 1 of a series in my experimets with drone spectroscopy.
Info/Links
Public Lab - publiclab.org
Public Lab mini-foldable spectrometer publiclab.org/wiki/foldable-spec
Video capture - AEE Lyfe Silver camera
Video Editing - OpenShot and Lightworks
Voice over - Natural Reader Online www.naturalreaders.com/online/
Credit
Background presentation music by A. Shamaluev (Ukraine)
ashamaluevmusic.com 
Наука
Thanks. I've got a nice refractor with a poor focuser. I'm in the process on converting it into a spectroscope.
Any made from glass? Polycarbonate is easy to scratch and blocks almost all UV. Blu-ray?
Rubbing the DVD with paper can damage the grating. Simply put it in warm ethanol solution and wait for the dye to dissolve. Notice that the other half with the aluminum you said to discard still acted as a reflective diffraction grating. 5:27
Any updates with your mini spectrometer? Applications on the drone? Did you use the hot lens or remove on your camera? Do share if you used... I've not read about before. Though I recall when working in the lab, i'd get asked if people could use the spectrometers on aircraft and flyby to detect chemicals. Hyperspectral imaging is the better method for doing that or some form of like FTIR microscopy even better. Maybe some other methods too. Interesting though connecting now for use on drones. Thanks for sharing.
@jafinch78 - Unfortunately, I have not been able to work more on experiments with a spectrometer on my drone. You are right, there are already commercially available cameras/spectrometers/spectrophotometers and other sensing equipment. However, these tend to be moderately expensive. My project was more of an amateur attempt and budget operation. I hope to be able to return to woking on this in the near future and will publish new videos when completed. Thank you for your interest.
@@adventuresindroneflying5769 Awesome. I just re-assessed and amazingly found an optical bench for my interferometry projects that I concurrently have with the webcam spectrometer. For drones... I've not thought about much. Hyperspectral imaging more-so I'm aware of... though that's not quite DIY in my plans until I get the simple single spectrometer working. Though you did inspire me to think about. Same goes with ground penetrating RADAR and RDF again as those I've thought about and looked into more with some equipment... though other incidents arising I had to respond to. Would be neat to do sensing, geology and surveys with a drone. With the new licensing requirements... I suppose if was doing drone work, best to plan all the options ahead of time and factor in the design plan. Excellent to see and read about others finding cost effective ways to perform what costs typically significantly more. Keep us posted! Eagerly awaiting. Thanks for the reply and update. Best Regards
@@jafinch78 Sounds like you have some cool projects going as well and I would be interested in your progress. The company I previously worked for was a environmental engineering company and had a small drone program, mainly for geo-surveys, emergency response, and 3D LIDAR mapping. One of our largest clients was the oil and gas industry. A problem they deal with is known as "NORM' (naturally occurring radioactive material) that accumulates in oil and gas processing equipment in the scale build up in piping and can result in dangerous levels of radiation exposure to workers. Back then, workers had to conduct NORM surveys of the equipment using a meter near the equipment and any that exceeded limits had to have restricted access and warning signs. I researched the idea to attach a small alpha-Beta-Gamma detector to a drone and use it to safely conduct the the NORM surveys. I had everything figured out, but couldn't get the company to buy into it unfortunately. Good luck on your projects, take care for now.
Can I use body spray instead of alcohol
I am not sure, I have not tried that but WiKi does list alcohol as potentially one of the ingredients in body sprays:
Some common ingredients found in body spray include: butane, isobutane, propane, alcohol, parfum.
Body spray - Wikipedia
I guess try it, let me know how it works for you and
thanks for watching the video.
Can you I dont know
If you cut the dvd underwater it doesn’t crack that much
Thanks Jkl Imper, that's a great suggestion and I hadn't heard or seen that posted from anyone else, I will give it a try when I get back to some of the diffraction and spectrometer experiments I want to do.
alcohol 91 or more is ok?
Yes, but be aware, that the alcohol is flammable. Ork in well ventilated area and no open flames. Also wear gloves to prevent the alcohol causing the CD/DVD dye from absorbing into your skin.
And more questions
I want to know that temperature of hot water.
@@mpchannel783 To be honest, I didnt measure the temperature of the water, but water from the hot water faucet is what I used.
@@adventuresindroneflying5769 CD ok I can see spectrum light but DVD I can't see I do it same.
@@mpchannel783 the DVD has a clear polycarbonate section that has no grooves to make a spectrum and another section that has the grooves to make diffraction grating and spectrum. Check both sections for correct one. Publiclab.org is a good website for more info about it. Check it out here:
publiclab.org/notes/MrBumper/01-11-2015/preparing-a-dvd-r-to-act-as-a-diffraction-grating
Hope that helps.
You could have just used a razor blade to split the disk without all that alcohol nonsense
Thanks Devan for watching, the comment, and suggestion. The alcohol is just to remove the DVD dye that can affect the wavelength refraction. Also, I had varying results just trying to split DVDs and CDs with a razor on the edge.