I have seen projects where people created scanning thermal cameras, repurposing one of those IR thermometers I believe, such as - https://www.youtube.com/watch?

I have seen projects where people created scanning thermal cameras, repurposing one of those IR thermometers I believe, such as - https://www.youtube.com/watch?v=5v61Kuaxab0 https://www.youtube.com/watch?v=5v61Kuaxab0 As far as I know the sensors used in thermal cameras don't use silicon due to the long IR wavelengths they're detecting and instead use something like InGaAs iirc, so I assume making your own sensor would be very difficult. However possibly you could make your own thermopile array instead - https://en.wikipedia.org/wiki/Thermopile https://en.wikipedia.org/wiki/Thermopile ? I'm not sure how they compare to the sensors normally used though. Edit: Also https://en.wikipedia.org/wiki/Microbolometer https://en.wikipedia.org/wiki/Microbolometer seems like you can use silicon + another layer to handle the IR