Ablaze
0
- Joined
- Oct 19, 2011
- Messages
- 462
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- 0
Hmmm... interesting avatar geeky. Makes me want to steal it!
I won't, but I still want to.
I won't, but I still want to.
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Surprisingly most solar cells are most sensitive in near IR. IR will also have least losses in the air. If you only want few mA, then maybe even 200mW IR laser could do that. And solar cell can charge during the day too.
Divergence of the beam would be the main problem. At 100m, the laser beam will be larger then even 5x5cm. More like 50x50cm. That is with common small lens at laser side.
To get better divergence, you would need larger diameter lens, or curved mirror, at laser side. Things like that tends to be expansive.
A solar panel with no direct sunlight is still a better option than using a laser. But... is "better" good enough? Hard to know if you won't tell us how much power the device requires.
I think there are probably cheaper, simpler solutions. If you pay enough you can find non-rechargeable batteries with an absolutely massive energy density. You can get a 9v battery that will power a smoke detector for 15-20 years, for example.
If you put a 10 year battery in there, would that be enough? I think it would be a lot cheaper then mucking around with solar collectors and IR lasers.
I think there are probably cheaper, simpler solutions. If you pay enough you can find non-rechargeable batteries with an absolutely massive energy density. You can get a 9v battery that will power a smoke detector for 15-20 years, for example.
If you put a 10 year battery in there, would that be enough? I think it would be a lot cheaper then mucking around with solar collectors and IR lasers.
Get a laser and optics. Expand beam to a safe size which does not exist as in a worst case scenario someone may come with binoculars to look at your secret device. :gun:
May you bury a cable? It might be cheaper and more simple.
easy to say huh .
where do i get this laser and optics ?
looks like those ir laser are really poor with high divergence . i'm not sure if beam expander would help to reduce the beam diameter to approx 5cm at 100m.
is it possible to focus the beam at the expander input to a tiny dot , so at the output it will be a bit larger , but at 100m it wont be too big ?
what type of focusing mechanism is needed ?
is it possible to use two expanders in series ?
the beam will be located 6m high , and the target is a it higher , around 8-9m .no buildings in between .
can somebody reccomend cheap ir laser diode just to test power output on a solar cell ? (from short distance)