What mathematical tool could be used to correlate a previous graph in a database with the one obtained through spectroscopy and in this way have certainty of identification of a certain molecule or substance?
In terms of calibration, best to use a compact fluorescent light as a source, and use the compact fluorescent graphs on the Theremino website to show where the peaks should be in nm. The software has adjustment sliders to let you move the real time peaks to their correct nm positions based on the Theremino calibration examples. There should be a tutorial on the Theremino website on how to do this.
In the HD 3000 the IR filter is glued in, so you need to carefully break/cut it out with an exacto blade, taking care not to scratch the lens underneath.
@@SK-rd4lu You can see all the visible lines, just won't be able to see anything above around 700 nm. You need to adjust the lines to their calibrated position in the Theremino software, using a compact fluorescent bulb as a source preferably.
I have constructed an assembly to use the Theremino software too. works quite nicely but I notice an excessive sensitivity to green light 500-550 nm. It distorts every light source's gaph with extra levels of green, and boosts their green spikes. Besides that everything else looks good. I am wondering how to fix this. I am currently using a 1000 lines per mm difraction grating. Wondering if I should try the 500 lines per mm one. Have you encountered any similar behaviour in your assembly?
Hi - not sure what is causing that... I am also using a 1000 lines per mm grating, the graphs usually look quite similar to the examples from Theremino's website. Perhaps this is some spectral peculiarity of your webcam? You could try changing all the Theremino camera settings back to default, or try to adjust the colour balance in the video control pane.
@@plenum88 Thaks for yout reply. Yes, I suspect the webcam too. I tried pretty much everything, even using different shades of magenta filters to cancel the green light. Nothing works quite right. Filters help a bit but they usually eliminate other wavelengths too. The image of the camera clearly show a very bright green band... It seems that it is extra sensitive to green. I'll work with that for now, and eventually I'll try a different webcam. Aside from that it displas the 4 peaks of T8 fluorescent tube beautifully, it is just that the 546 spike is way higher than the 436 one.
Can you set a piece of paper on fire and a piece of cardboard on fire and see if their spectrums differ? Just with a match or laser. Maybe set some other things on fire too? I understand that for solids hot objects give a continuous spectrum but gases give emission lines while cool gases surrounding hot solids give absorption lines. I am interested in the spectrum of solid though are the plots distinguishable? Have you tried subtracting out the blackbody radiation using plancks law or something like that to get the peaks from the continium?
Nice video. It would be great if you gave the link to download the free Theremino software you use in the video. Apparently Theremino does not give out that link.
You can find the software here: www.theremino.com/en/downloads/automation scroll down to Theremino spectrometer, at the end of the section is the software download line, now at ver. 2.8
Hi, I am in the process of developing a similar one myself. Currently, I am trying to find a good webcam. I have 2 questions. 1. How did you remove the IR filter from the Microsoft one (was it hard ?, is it so straight forward that I will figure it out myself ?. I don't want to break the camera.). 2. I have DSLR, but I am not even sure if this can a) work with theremino soft b) will it capture diffracted light correctly. You probably don't know the answer to the second one, but just in case you know I am asking.
Hi piesak12 - yes, it is difficult now to find a webcam that can have the IR filter removed easily and the focus also adjusted afterwards, since both the filter and the lens position are glued in place on the Microsoft cam. You can break the IR filter out since it is glass, which is messy but will work. However, the lens focus then needs a bit of adjustment to make the lines sharp and this step can't really be done with the microsoft cam. Yeah, don't think a DSLR will work, too big - you need a small USB HD webcam for this.
@@plenum88 Thanks a lot for responding. I really want to be able to detect infrared, so I'll probably buy a cheaper one, I think they're much easier to disassembly. I thought that resolution will suffer, but if Microsoft needs adjustments it won't change much anyway.
It would be good to measure good light or bad light, and best color of light and intensity of light that affect your body and head. Ya know what is best? Base on that?
ENGLISH Hi everyone, I'm Livio, the Theremino system electronics software engineer. www.theremino.com/en/contacts/about-us#livio Our spectrometer, like any other webcam-based spectrometer, provides only an approximate, and very inaccurate, measure of light intensity. I remind you therefore that only "frequency" and not "amplitude" measurements can be made. That is, the wavelengths (nm) of the various components of a light source are measured, but not their energies (mW). ITALIAN Ciao a tutti, sono Livio il progettista hardware e software del sistema Theremino. www.theremino.com/contacts/about-us#livio Il nostro spettrometro, come qualsiasi altro spettrometro basato su webcam, fornisce solo una misura approssimativa, e molto imprecisa, dell'intensità della luce. Vi ricordo quindi che si possono effettuare solo misurazioni di "frequenza" e non di "ampiezza". Cioè, si misurano le lunghezze d'onda (nm) delle varie componenti di una sorgente luminosa, ma non le loro energie (mW).
Hi, I have a few questions that hopefully is ok to ask here. How low is the UV spectrum accurate to? Do you know of any camera that get lower UV than the ones discussed here? As low as possible would be best as I'm trying to look at corona discharge.
What mathematical tool could be used to correlate a previous graph in a database with the one obtained through spectroscopy and in this way have certainty of identification of a certain molecule or substance?
How to Calibrate the Device? Means ROI of Image EM Visible Spectra. Does it give emissions? Thermino?
In terms of calibration, best to use a compact fluorescent light as a source, and use the compact fluorescent graphs on the Theremino website to show where the peaks should be in nm. The software has adjustment sliders to let you move the real time peaks to their correct nm positions based on the Theremino calibration examples. There should be a tutorial on the Theremino website on how to do this.
Im using the HD-3000 for a similar spectometer,how did you get the IR filter out?
In the HD 3000 the IR filter is glued in, so you need to carefully break/cut it out with an exacto blade, taking care not to scratch the lens underneath.
@@plenum88 was afraid of that, im preping a presentation for it at my Uni on Monday, how off will my spectrum be with the IR on?
@@SK-rd4lu You can see all the visible lines, just won't be able to see anything above around 700 nm. You need to adjust the lines to their calibrated position in the Theremino software, using a compact fluorescent bulb as a source preferably.
I have constructed an assembly to use the Theremino software too. works quite nicely but I notice an excessive sensitivity to green light 500-550 nm. It distorts every light source's gaph with extra levels of green, and boosts their green spikes. Besides that everything else looks good. I am wondering how to fix this. I am currently using a 1000 lines per mm difraction grating. Wondering if I should try the 500 lines per mm one.
Have you encountered any similar behaviour in your assembly?
Hi - not sure what is causing that... I am also using a 1000 lines per mm grating, the graphs usually look quite similar to the examples from Theremino's website. Perhaps this is some spectral peculiarity of your webcam? You could try changing all the Theremino camera settings back to default, or try to adjust the colour balance in the video control pane.
@@plenum88 Thaks for yout reply. Yes, I suspect the webcam too. I tried pretty much everything, even using different shades of magenta filters to cancel the green light.
Nothing works quite right. Filters help a bit but they usually eliminate other wavelengths too.
The image of the camera clearly show a very bright green band... It seems that it is extra sensitive to green. I'll work with that for now, and eventually I'll try a different webcam.
Aside from that it displas the 4 peaks of T8 fluorescent tube beautifully, it is just that the 546 spike is way higher than the 436 one.
Can you set a piece of paper on fire and a piece of cardboard on fire and see if their spectrums differ? Just with a match or laser. Maybe set some other things on fire too?
I understand that for solids hot objects give a continuous spectrum but gases give emission lines while cool gases surrounding hot solids give absorption lines. I am interested in the spectrum of solid though are the plots distinguishable? Have you tried subtracting out the blackbody radiation using plancks law or something like that to get the peaks from the continium?
Nice video. It would be great if you gave the link to download the free Theremino software you use in the video. Apparently Theremino does not give out that link.
You can find the software here: www.theremino.com/en/downloads/automation scroll down to Theremino spectrometer, at the end of the section is the software download line, now at ver. 2.8
@@plenum88 Omg thanks so much fren. I was looking everywhere and couldn't find it on their sight XD
great information. i need 200nm~500nm range. would you suggest which webcam or dslr?
Thanks for your comments - yeah, not familiar with the UV end so don't know where to point you.
Hi, I am in the process of developing a similar one myself. Currently, I am trying to find a good webcam. I have 2 questions. 1. How did you remove the IR filter from the Microsoft one (was it hard ?, is it so straight forward that I will figure it out myself ?. I don't want to break the camera.). 2. I have DSLR, but I am not even sure if this can a) work with theremino soft b) will it capture diffracted light correctly. You probably don't know the answer to the second one, but just in case you know I am asking.
Hi piesak12 - yes, it is difficult now to find a webcam that can have the IR filter removed easily and the focus also adjusted afterwards, since both the filter and the lens position are glued in place on the Microsoft cam. You can break the IR filter out since it is glass, which is messy but will work. However, the lens focus then needs a bit of adjustment to make the lines sharp and this step can't really be done with the microsoft cam. Yeah, don't think a DSLR will work, too big - you need a small USB HD webcam for this.
@@plenum88 Thanks a lot for responding. I really want to be able to detect infrared, so I'll probably buy a cheaper one, I think they're much easier to disassembly. I thought that resolution will suffer, but if Microsoft needs adjustments it won't change much anyway.
how can i export that data from the software and use it in case of analysis ?
I don't think the Theremino software has an option to create an exportable file yet.
How did you make the slit ?
It is 3D printed
It would be good to measure good light or bad light, and best color of light and intensity of light that affect your body and head. Ya know what is best? Base on that?
ENGLISH
Hi everyone, I'm Livio, the Theremino system electronics software engineer.
www.theremino.com/en/contacts/about-us#livio
Our spectrometer, like any other webcam-based spectrometer, provides only an approximate, and very inaccurate, measure of light intensity.
I remind you therefore that only "frequency" and not "amplitude" measurements can be made. That is, the wavelengths (nm) of the various components of a light source are measured, but not their energies (mW).
ITALIAN
Ciao a tutti, sono Livio il progettista hardware e software del sistema Theremino.
www.theremino.com/contacts/about-us#livio
Il nostro spettrometro, come qualsiasi altro spettrometro basato su webcam, fornisce solo una misura approssimativa, e molto imprecisa, dell'intensità della luce.
Vi ricordo quindi che si possono effettuare solo misurazioni di "frequenza" e non di "ampiezza". Cioè, si misurano le lunghezze d'onda (nm) delle varie componenti di una sorgente luminosa, ma non le loro energie (mW).
Hi, I have a few questions that hopefully is ok to ask here. How low is the UV spectrum accurate to? Do you know of any camera that get lower UV than the ones discussed here? As low as possible would be best as I'm trying to look at corona discharge.
We should all thank you!!!
Theremino software not saving calibration and settings.