Liz at Raspberry Pi explains how the blue filter in your Pi NoIR lets you measure photosynthesis:
If you’ve been reading our posts about why we developed an infrared camera board keenly, you’ll have noticed that we mentioned a lot of interest from botanists, who use infrared photography to work on the health of trees. We started to read up about the work, found it absolutely fascinating, and thought you’d like to get in on it too….Let’s say you’re a biologist, and you want to measure how much photosynthesis is going on. One way to do this would be to look for greenness, but it turns out an even better method is to look for infrared and not blue – this is what the filter lets us do…
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The Raspberry Pi NoIR Camera Module is a custom designed add-on for Raspberry Pi that does not have an ‘IR cut filter’ installed. Like the regular Pi camera, it attaches to Raspberry Pi by way of one of the two small sockets on the board upper surface. This interface uses the dedicated CSI interface, which was designed especially for interfacing to cameras. The CSI bus is capable of extremely high data rates, and it exclusively carries pixel data.
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