How to Make DIY Spectrometer | Optical spectrum analyzer | Light analysis
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- เผยแพร่เมื่อ 21 เม.ย. 2018
- This spectrum analyzer can analyze light, including infrared (IR) and ultraviolet (UV) light. It uses DVD Disk that works like a diffraction grating and splits light into the rainbow, the software then analyzes the rainbow. (A rainbow actually is the light spectrum)
In this video, I also explain why incandescent light bulbs are not energy efficient.
ABOUT SOFTWARE:
I want to thank people from theremino for making the great software, here is their website: www.theremino.com
And here is how to build spectrum analyzer, instruction from theremino: www.theremino.com/wp-content/u...
And here is the link to the actual software for the analyzer: www.theremino.com/wp-content/u...
More info here: www.theremino.com/en/downloads... - วิทยาศาสตร์และเทคโนโลยี
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Best of the best in the diy field, many thanks!
That is awesome! Will definetly try this with my students when the pandemic allows!
I finally got something useful in youtube I particullarly benefit with this video damn it saved from tomorrow's project seminar thanks brother 😊😊
Wow.
fantastic explanation.
Thank you.
was looking all day at a way to get an IR spectrum measurement cheaply. Absolutely brilliant!
Glad I could help!
Same here. Did this finally work well for you? I would like to measure NIR intensity changes under the sun at different times of the day and with clear sky vs some clouds etc. But not sure if this can handle and give a roughly accurate indication directly from sunlight?
Thank you so much for this video! Amazing job!
lmao, Im trying to up my light game for plants and I see your comment here. I just got a PAR meter and i wanna have a way of seeing the spectrum as well without dropping 1,000 dollars on some commercial one
Very interesting video. THANKS !
Nice video, thanks for making it !
very ingenious use of a dvd as a diffraction grating....
Saved me a lot of money and what a great accent! Building asap!
Wow.
So simple.
Thank you
Very cool indeed, great work !
Thank you for this excellent demonstration, it is very inspiring! Would something like this be capable of at-home metallurgical analysis with a proper vacuum?
Wow, I must say that this is a really nice tutorial indeed! Cheap and surprisingly efficient :) Just one note though: you could've covered the slit on the wood up with something (say two razor blades) to make it even thinner, because the shortcomings of a wider slit (namely distortion and ghost images) was really apparent from the video as well ;)
I'm confused, are you saying making the slit only 2 razer blade widths wide?
@@bobbyayotte3623 No, the slit needs to be as narrow as possible in order to make the results as focused and precise as possible (this device is basically a variant of the camera obscura). Instead of the crude slit cut into the wood a really thin slit should've been created. And the easiest way to achieve that is by letting the light pass between the blades of two razor blades, which usually have a VERY flat and uniform edge, thus making for ideal slit material.
@@CoolKoon OLD GUY HERE.. I need a little more about your slit comment. Please describe YOU.. creating the perfect slit. I would greatly appreciate. I could really use a spectrum analyzer and money is a real consideration. So I have to try building one.
@@riverman4798 I can only repeat myself: the concept is very similar to a camera obscura: the narrower the slit, the better the result. At around 3:23 this becomes really apparent when the author uses a fluorescent lamp for calibration: instead of a narrow line and sharp peaks the image is rather blurry and the line has tall points around the peaks. This (along with what the author has called "unstable peaks") basically means a lot of noise and makes the readings less reliable, particularly for light sources with discrete peaks (like fluorescent lights, LEDs, mercury vapor etc.). The way I'd construct the slit is that I'd affix one of the razor blades first, then I'd turn on the contraption and would slowly keep sliding the other blade closer and closer until I'm satisfied with the reading on the screen. And I'd make sure that the slit is truly the only source the insides could get any light from.
omg you saved like thousands of bucks :) suscribed!
amazing! thanks for sharing.
awesome video ! Just what i was looking for :)
very intersting thank you Mr. Egger
Great video! Thanks very much
Awesome thanks for sharing man!
Superb , thanks for sharing.
Thank you so much. Best diy video
hello, excellent your video. I have a question for you. What low power and voltage light would you recommend to make a portable spectrophotometer? Thank
thats a really really good visualization of additiv color right there 5:19
might be the best way to show it to someone, thanks for that =)
Thank you that was really helpful!!!
Very cool indeed, thanks for sharing.
Found this to prepare the DVD : publiclab.org/notes/MrBumper/01-11-2015/preparing-a-dvd-r-to-act-as-a-diffraction-grating
Wow spectacular video.
Wow this is impressive!
that's awsome, many thanks!
You will get better results if you remove the blue dye from the split DVD. You can also use CD but the resolution is lower. The CD can be used without any modifications as a reflective grating. DVD can also be used as a reflective grating but the blue dye will interfere a bit.
Wow. That’s great!
Thanks for sharing!
Thank !
Theremino is verygood !
Great video!
this video is brilliant.
I’m planning a similar project with a similar camera from EBay, the specs say cam has auto brightness and colour correction. Would this cause a problem in the spectrum, or there’s a setting on the PC in the program to control this?
Veeery niiice, thank you!
Thank you for the interesting video however, you have not mentioned that how you synchronised your camera with your software and which software did you use for it?
This video moved me to tears
Could you link to the camera you used? Not all cameras have IR filter that's this easy to remove.
Hi Sir,
glad to see this video regarding spectrum,
Explanation super and UI is too good(For UI which software is best Please suggest me sir )
woah this is cool. Okay so NOW how do we make this homemade Spectrometer into a molecular scanner so we can tell if food or water is safe? I wanna know!
Hello, this video was very very interesting, I want to build one too. Did you build a flame spectrometer too?
can you drop the dimensions/measurements of the planks of wood and the measurement for the slit as well?
thanks!
Awesome project. What if I want to measure the sunlight quality? Where should the slit face?
Thank you so much
Thank you for comparing the spectrumof white lamps, especially white LED and RGB-"white"-LED. I always had a feeling that this light is awkward for some reason.
this save my money!!
I need buy a webcam for this specifically.
Any suggestions? Preferably one w/out the IR filter if possible lol!
Nice video. Do you have the link for the free Theremino spectrometer software you are using. Apparently Theremino does not give out the link at their site.
Please can some inform me on choosing a webcam for this? I bought one with a glass lens, I can't take it apart to remove any filters that may be there. However from my understanding glass blocks UV and some IR. Does it matter too much?
Great video, thanks for sharing. Would be great to see if there's enough spectral resolution to detect absorbance in chlorophyll ( from garden grass ) used in photosynthesis.
I’m thinking about making one of these but using vantablack paint on the inside of the box it should give more accurate if not close reading to the machines that cost $2500 haha
The Retina borrows from IR light to see with contrast. You need IR light. Without it, you'll notice things go a bit blurry.
cool project
does it work with a spectroscope? then use the camera to analysis the colour
Great video! Question: are those peaks a measurement of transmittance or something alike?
The detection amount depends on the sensors. You can calibrate this with a source of known ratios, ideally a flat spectrum although that's not exactly possible. A more accurate option would be to figure out what frequency curve is emitted at what temperature and use that. It's material independent and was the birth of quantum physics is all I remember
Hello, great video. Why do we need to remove the IR filter when analyzing the remote when we were able to view IR readings with the incandescent bulb? Is it because the lightbulb's IR portion is closer to the visible spectrum?
he already removed it, i think he was just reiterating that you need to remove them
Thats awesome
Where you had connected DVD Diffraction grading? Have you connected the mirror? At the edge of the slit? Or you have connected in front of the camera-Lens?
Excellent..
keen... ordering cam now
respect you dude
EXCELLENT!!
Hello, it is possible for theremino spectrometer to be attached to a new software that showing the meaning of the readings of thermino spectrometer? Please answer.
Awesome!
Hey! Great video but what if I want to introduce a sample and measure the transmittance/absorbance. How do I introduce the sample in the set up? And if I have preset filters how do I obtain data from the set up?
me too wanna try ppf or ppfd or par plz!!!!
The lack of an answer is probably the answer. (Op doesn't know)
Great, amazing
Can you please share some information on the software used in this project?
Hiii ,what is the name of the software that you're using to test for the spectrum light
Thank you.
I'll try making it after you.
And how can I get Theremino Spectrometer software?
Amazing tutorial! can I use this to analize rocks, or other objects?
I have the same question
wich is te lowest wavelength it can detects??
Can the software produce a .ccss file for helping monitor calibration?
You. Are. A genius! :3
Awesome video! Do you mind me embedding this video on my physics website for Dutch students?
is it possible to get Light Density using this experiment ?
Can we use it for food or fruit sample analysis
What is the adhesive used to attach the diffracting grating with the lens.Is soldering iron being used?
hot glue
Thanks for the video. I don't find the Trust WB-6250X(no longer purchasable) webcam give in the thermino assembly pdf. could you please help me what camera should be good for this reason, and also I am on a tight budget. Thank you
Hi, I was using 'Trust SpotLight Pro' in this video, it is pretty good for the spectrum analyzer because you can easily remove IR filer from it, and also it has good enough resolution. Maybe there are more good webcams for this project but I don't know about them because I did not try them.
@@ElectricalPro better resolution cam means more accurate results? Your posting is awsome. thanks alot
!!!
@Youngsun Kim, yes, you will be able to see more details on the spectrum. But it also depends on other factors, for example you can only get high resolution spectrum with a narrow slit.
@@ElectricalPro i will try narrow slit with 2 razor blades.this post is really amazing. thanks!
Which software do you use to analyze
brilliant
Does anyone have an idea how you get the spectrum to go the whole width of the camera or do adjust it for that? I tried to make a different one but the the 'rainbow' is only on a narrow field of the camera and I can't get the software to compensate for it. It would seem like I have to put the camera far away from the grating in order to get it to widen out.
Same here :(
it's useful and amazing. But can I replace the camera by the onther one and can you suggest me another one?. All of you camera suggestion is no longer available :(
How to select wavelength for this caase? for example 400-700nm for analytical analysis of chemical solution or dye /
Both the WB-6250X and WB-5400 are not longer available. Could you recommend another camera, Please?. Thanks
should work with any cheapo camera really, my advice is to also stick away from using a dvd but instead use a proper LINEAR diffraction grating, they are cheaper but will give more accurate results, however if a diy type thing is what your going for than a dvd works just fine.
Liked, subscribed.
in general I like this device very much and will definitely build it but I have a question. I do not know if I only think so, but I think this spectrometer has a problem with reading deep red, for example in a filament bulb you can see a large decrease in the light intensity in the red spectrum, and it shouldn't be?
The problem is that most of these spectrometers aren't calibrated for the spectral response of the CMOS imaging sensor of the webcams.
All those webcam spectrometer programs assume that the CMOS sensor is equally sensitive to light from ~300nm to ~1100nm.
In reality though, most CMOS sensors have color filters (see Bayer sensor and the used filters) which influence the sensitivity on the RGB channels of the camera and furthermore the sensor itself, even without the filters doesn't have a constant sensitivity.
With most CMOS sensors with Bayer color filters, peak sensitivity is reached around 550nm (which is also close to the peak sensitivity of the eye) which is green and very often a second peak exists at around 800nm (which is barely visible to humans and can be considered near infrared). In between those two peaks the sensitivity usually drops to a minimum between 600nm and 700nm to around 50% (which is exactly where the drop is located in the spectrum in the video) and towards the UVA region, the sensitivity quickly drops and reaches nearly zero beyond 350nm to 300nm. This is due to the Bayer color filters (and the microlenses on top of the filters) which are partially opaque to the lower region of UVA and usually fully opaque to UVB and UVC.
On the infrared spectrum, the sensitivity more or less linearly drops from the second sensitivity peak at around 800nm to zero at around 1100nm (which explains the more or less linear drop in the measured IR spectrum of the incandescent bulb shown in the video). This is due to the fact that the silicon bandgap at 300K is at 1.12 eV which corresponds to a photon with a wavelength of 1107nm. So beyond that wavelength, the photon doesn't have enough energy anymore to promote an electron from the valence band to the conduction band of the silicon semiconductor of the CMOS photoreceptors, which is necessary to generate an electric potential and therefore a signal in the CMOS sensor.
@@grima0482 Thanks. I have thought that that the drop in red spectrum is due to the fact that the diffraction grating from dvd disk is coated in something blue that absorbs red light, but now I look at it differently. Thanks again for spent time for answering.
Look...i ve been trying to make it work but i just cant...the problem is that the line is very thick and cant distingusidh colors...can you give me more details?
Where can I get the Theremino software?
Hello! This is a really amazing project. I wish to make it too for school. Can you pls tell some basic specifications of the camera you're using? Thanks!
Hi, I was using 'Trust SpotLight Pro' in this video, it is 1.3 megapixel (1280 x 1024) sensor resolution, but the most important for me that the lens is removable, and IR filter removable as well... you can use it, or you can find something similar.
@@ElectricalPro thank you so much!
What is that software for analysis of the spectrum
That was smart
how did you get it to display in real time
It's interesting you removed the filter to let infared through. Doesn't the glass block the UV as well?
Probably
what if i use a cd disk instead of a dvd disk? tried it with a cd disk and i am working on it...
How to get absorbance value for different wavelength ?
great!
I am interested to test
Whether a stone a.k.a a mineral contains iron or copper or aluminium..
After calibrating the LED light using the software..
Can it measure the absorbance and transmittant required for interpretation of substances that exist in that stone (mineral)?
If you make it very hot like putting the rock powder in a flame.
Does anyone know the dimensions of the box and if they matter? Help would be appreciated
I am going to build it up myself, I just would like to ask 2 questions: 1. why the camera has to be installed at 30 degrees angle? 2. Is it necessary to use empty CD? are readings going to be distorted when using CD with something recorded on it? Many thanks!
I suspect the angle is to allow the grating to split the light at different locations of the camera’s sensor. If you look at a CD, you see the rainbow only for light coming at some angle, not for straight light. Also, if you put the camera straight, there will be too much light and the camera sensor may saturate.
wonderful
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awesome video! how about for analyzing liquids?
Put a cuvet in the path of the slit and the camera, and now you are detecting light that did not get absorbed by the liquid.