Hey all - I know everyone is busy, as am I. Our Sci, our new company, is getting off the ground and it’s taken all my effort.
But I wanted to share as to why I think this single pixel camera idea is even more relevant -->
Until the last few years, if you wanted a ‘single pixel’, you could find inexpensive ones in the visible range (350 - 950nm like the mini spec I shipped with the kits), however, higher or lower than that was often quite hard for two reasons - 1) if you need a light to illuminate the image, LEDs in the 200 - 300nm (UV) range and 1050nm and above (Mid-IR) were very expensive, and 2) if you needed a sensor to detect those ranges it was even more expensive.
Furthermore, there are all kinds of things that correlate and are visible in the mid-IR and UV-B and UV-C range - in many ways much more so than in the visible range. So making these ranges cheap opens a massive number of applications.
But things are changing:
- There are now UV LEDs in the 260 - 290nm range for < $50/led, and in a few years they’ll be <$10/led (here’s an example datasheet - http://www.cisuvc.com/content/documents/files/CIS.Klaran-GD-DS.061317.pdf)
- There are now mid IR detectors from 1350 - 1850nm in the $100 - $200 range, which have 30nm resolution - so they are like low-resolution spectrometers in the mid IR range!!! And, the word on the street is, soon this will be 1350 - 2150nm !
- There are now mid IR LEDs in the 1300 - 2100 range as well.
- Even in the normal visible and NIR range, components are getting more integrated and cheaper - sparkfun has 2 breakout boards which cover the range from 400 - 850nm - if you bought the modules directly you could get it for < 15 dollars. These modules include the detectors, LED controller, and signal conditioning (that’s a lot of circuitry you’d otherwise have to build yourself).
So some of these parts aren’t really cheap yet (<$10 dollars), but they are getting close, so imagine this:
A single pixel camera which imaged from 260nm to 2100nm for under $2000 dollars. That is completely possible in the next 2 years.
There are so many pieces of crazy expensive lab equipment this device could replace, from plate scanners to reflectance spectrometers and beyond. Besides the fact that it could be used in field and outdoor environments for monitoring way way way beyond the current capacity on the market.
Anyway, I’m sorry I haven’t been able to do more active development on this, but I want to at least note to folks that creating the backbone for future sensors in a general purpose single pixel camera setup is more relevant and useful as ever, and wherever I go I’m pushing folks to try to fund the development so I can spend some time on it, and I’d suggest you do the same!