Hi group.
I'm trying to find a cheap(ish) columating lense to increase the field of view on a led receiver. The situation is I have a laser light source sending a beam over a varying distance, usually 8ft to 40ft, but the slightest vibration is causing the readings I'm getting back from the receiver to vary wildly. I need some means of focusing the light onto the receiving element. Any ideas?
Thanks
snipped-for-privacy@hotmail.com wrote in news: snipped-for-privacy@e3g2000cwe.googlegroups.com:
Red filter in front of an acrylic asphere lens like the Philips CAY046, same as used for collimating a laser diode output. Adjust the focus to reduce energy density, and to spread the spot, and use a photodiode of at least 1mm square. Alignment will need some well-made parts.
I'm assuming your laser is red...
Also, maybe stick a bit of mylar drafting film between a lens and a simple phototransistor, as a diffuser. That might work, and would be cheaper if it does.
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