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Optics

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
 
L

Lostgallifreyan

Jan 1, 1970
0
[email protected] wrote in
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

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.
 
L

Lostgallifreyan

Jan 1, 1970
0
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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