DIY High Resolution Spectrometer (2018)
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DIY High Resolution Spectrometer (2018)
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Re: DIY High Resolution Spectrometer (2018)
#2Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
Re: DIY High Resolution Spectrometer (2018)
#3Really cool! I wonder if this could be combined with a digital micromirror and compressed sensing to inexpensively recover both spectral and spatial resolution. (see: "single pixel camera")
Re: DIY High Resolution Spectrometer (2018)
#4Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
I will add that I am willing to do some advanced image processing and 3D geometry to make this happen. I am unimpressed by projects I have seen so far, but it's not fair assessment because I don't know the field very well.
Re: DIY High Resolution Spectrometer (2018)
#5Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
That's a beautiful link, thanks for that.
I'm probably missing something obvious, but could it be done by using a larger number of inexpensive setups?
There's no reason that each camera has to be focused on the same part of the grating, right? 4x cameras, point each at a different region and stitch it in software.
Re: DIY High Resolution Spectrometer (2018)
#6Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
You might be able to achieve it by placing the diffraction grating at the focal point of the optical path. Given the incident angle would vary across the field you would probably have to calibrate it and realign the samples, but it seems at least plausible.
I don't know how long most commercial imaging sensors typically go, but you'd also have to do some work to remove the IR filter that's typically added by the manufacturer. There are a number of tutorials for this.
Re: DIY High Resolution Spectrometer (2018)
#7Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
That's a beautiful link, thanks for that. I'm probably missing something obvious, but could it be done by using a larger number of inexpensive setups? There's no reason that each camera has to be focused on the same part of the grating, right? 4x cameras, point each at a different region and stitch it in software.
Yes you can stitch: have 4x cameras, or move the camera and take 16 images, or a single detector are all going to work. My question is what is the lens/optics set up? I think the answer in understanding optics and or know the right terms and or understanding all the different types of spectroscopy. It's a bit to look into. It's seems someone would be publishing DIY things like this already, but I don't know the right terms to search for.
Re: DIY High Resolution Spectrometer (2018)
#8Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
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Re: DIY High Resolution Spectrometer (2018)
#9Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
> Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
The linked project uses a 4000px wide image sensor and the second example in the article is a solar spectrum like what you want. It's not as sharp, but it's remarkably good given that the diffraction grating was a fragment of a DVD and the opening was a 3D printed slit.
940-1240nm isn't "uv to ir" like you described, though. That's just pure deep infrared. You'd have to test to see if the camera's image sensor was sensitive in those regions with any filters removed, but I doubt you'd get much signal in the deep IR region. Good sensitivity that far outside of the visible range requires a specialized sensor. Some security cameras designed for "invisible IR" will have such a sensor inside, so you could start by looking there.
Re: DIY High Resolution Spectrometer (2018)
#10Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: https://solarsystem.nasa.gov/resources/390/the-solar-spectru...
That's a beautiful link, thanks for that. I'm probably missing something obvious, but could it be done by using a larger number of inexpensive setups? There's no reason that each camera has to be focused on the same part of the grating, right? 4x cameras, point each at a different region and stitch it in software.
It's easier to rotate the grating. That's how we did this in labs in undergraduate (we did a session on imaging the sun with a high res spectrometer). Or put it on a stepper or servo motor and sweep it in several positions. We used an SBIG camera and a micrometer-adjustable spectrometer. It seems like SBIG got bought up by the folks that make MaximDL. They used to sell these instruments off the shelf for $$$$.
It's more complicated to use multiple cameras on one grating because you'd need far more light shielding.