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| 481THz optical receiver with 100mm lens |
A 5mm 20 degree red LEDusing just its own built-in lens was shone out of the stairway window aiming down the street in daylight with 1kHz modulation. It was taking around 20mA. I then walked with the kit to the far end of the street and the signal was solid (S9) in the RX earpiece at a distance of about 0.25km. I now need to find a more distant test range and see how far this can achieve. Depending on results I hope to go looking for GB3CAM next week.
2 comments:
You could do optical SETI with that gear as well, Roger!!
Tony B
Very nice construction!
I am an information theorists, but today I am researching practical optical encodings/decoding and your pic popped up on google images.
Can you tell me a bit (or point me to docs) what kind of data you can send to this? Can you send AND receive with the same optics?
And at the same time (full-duplex) ?
Is it light pulses or AM or FM or something?
I am wondering about what cool things one could do with this + a polarization filters at the sender
and at the receiver.
Also, I would like to use your picture in my PhD thesis, as an illustration of a multiple access channel -- imagine that there are senders pointed exactly at your receiver.
Would you mind if I include that picture?
My email is first dot last at gmail dot come
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