Products > Thermal Imaging
DIY SWIR/NIR source from a halogen lamp
DaJMasta:
Maybe something like a mirror galvanometer or pair of them would do? They would be controllable (or variably oscillating), and if you're not concerned with a full-motion sort of framerate, they may be easier to deal with because you can configure the scanning yourself, though they are not so cheap with the required controllers.
Rotating mirrors may be difficult to find, but I think a lot of them could actually be usable if your form factor/placement/software is all configurable. I thought about getting a flat mirror on a synchronized motor to make a linescan camera a full frame camera, and my trouble was trying to locate a mirror that was axially drilled for minimal image geometry processing - getting a suitable mirror you could attach to a collar for the motor would work, it would just need balancing and then some correction to the final image. The technicalities of the optics are beyond my understanding, but you may also have trouble with lens convergence distance - unless you get a lens that gives you a fully collimated image to project on your mirror, you're going to need some careful focus adjustment or even lenses between mirror elements.
_Wim_:
--- Quote from: Ben321 on April 27, 2021, 05:22:50 am ---I was thinking more along the lines of motorized rotating hexagonal mirror in front of a pinhole and an InGaAs photo-diode. On the electronics side, a transimpedance amplifier for the photodiode, the output of which connected to my Picoscope USB oscilloscope.
--- End quote ---
Personally I would start from a linear array like this (https://www.benl.ebay.be/itm/284102443087), and move the array up and down itself behind a standard lens (so in essence imitating a rectangular sensor instead of a line sensor). This removes the whole complexity of the optics. These line arrays are relative easy to read out with a micro. Up down movement can be stepper controlled as it does not need to be that fast as your reading 256 or 512 pixels at a time.
Ben321:
--- Quote from: _Wim_ on April 28, 2021, 05:31:18 am ---
--- Quote from: Ben321 on April 27, 2021, 05:22:50 am ---I was thinking more along the lines of motorized rotating hexagonal mirror in front of a pinhole and an InGaAs photo-diode. On the electronics side, a transimpedance amplifier for the photodiode, the output of which connected to my Picoscope USB oscilloscope.
--- End quote ---
Personally I would start from a linear array like this (https://www.benl.ebay.be/itm/284102443087), and move the array up and down itself behind a standard lens (so in essence imitating a rectangular sensor instead of a line sensor). This removes the whole complexity of the optics. These line arrays are relative easy to read out with a micro. Up down movement can be stepper controlled as it does not need to be that fast as your reading 256 or 512 pixels at a time.
--- End quote ---
What's the price of a linear array? A single InGaAs photodiode is already $80 from Edmund Optics. One place that was sellng a full rectangular array (suited for direct use in a camera) was selling that one InGaAs array chip (just the chip itself, and no optics or other electronics) for the huge price of $20000 (which is well over 90% of the cost of a fully functioning SWIR camera, so building one myself from such a component would not save much money). I can't imagine that a linear InGaAs array is not going to be cheap either. I'd guess it would still be somewhere around $800.
_Wim_:
--- Quote from: Ben321 on May 07, 2021, 08:28:05 pm ---What's the price of a linear array? A single InGaAs photodiode is already $80 from Edmund Optics. One place that was sellng a full rectangular array (suited for direct use in a camera) was selling that one InGaAs array chip (just the chip itself, and no optics or other electronics) for the huge price of $20000 (which is well over 90% of the cost of a fully functioning SWIR camera, so building one myself from such a component would not save much money). I can't imagine that a linear InGaAs array is not going to be cheap either. I'd guess it would still be somewhere around $800.
--- End quote ---
New they are probably really expensive, but on Ebay they pop-up between 75 & 200$, which cannot be said for complete camera's unfortunately.
ducatidragon916:
I know its been awhile on this topic, Have you had any luck with Converting the existing hardware on the S2000 Ocean Optics spectrum analyzers to USB etc? What if any information have you found on this? I know that they are boards that work on PCi slots which do the A/D conversions just wondering if you have had any luck reverse engineering on this?
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