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[DPRG] FW: Any ideas?

Subject: [DPRG] FW: Any ideas?
From: Robert L. Jordan rljordan at airmail.net
Date: Sun Oct 8 22:08:42 CDT 2000

Here is a good question I received. Any ideas for Hank? Sounds like he is asking how to get more detection distance from a laser and detector at 810 nm. My thought is to use a lens in front of the detector to focus at a distance. 
Any other suggestions or ides? Just copy the list and Hank.

Robert L. Jordan

-----Original Message-----
>From:	Hank [SMTP:fhb2000 at pacbell.net]
Sent:	Sunday, October 08, 2000 3:22 PM
To:	rljordan at airmail.net
Subject:	Any ideas?

Do you or someone you know have any optoelectronics ideas?  It's a a silicon detector problem.  I'm utilizing the BS2SX and a 5mw laser diode module @ 810nm and a silicon detector with a 810nm narrow bandwidth filter to measure when this IR laser pointer strikes black or white.  Laser and detector are side by side and measure light reflected back.  I know it's possible or those long range bar code scanners wouldn't work.  Only need object detection not bar codes.
I can only detect out 2-3ft, but need 8ft range.  I don't understand the
capacitance or resistance to make detector more sensitive.
I think my op amp is maxing out too.
Thanks - hope you can help,
Hank Burbeck

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