[Laser] PIN diodes and Noise floor

Sat, 19 Apr 2003 14:45:08 +0530

Hello Andy

Perhaps you can use a band pass filter for the laser light you are using and
it will sure cut down the ambient light from other wavelengths. You can use
interference filters as they are very sharp. Try Mellos Griot for it or
Edmud Scientific etc.

You can also use a long tube to house the photo sensor deep inside the
colimated zone to cut liht from other directions.

One the ambient level is down, you can use AC amplifiers in place of DC
amplifier to amply the received signal. If you have used standard fequency
to modulate then you can use a modem IC or band pass filters to get
amplified signal and then remove the modulated from received signal.

Is there anything else you wish to know?

Shyam
=======================================
Shyam Sunder Tiwari, Ph. D. Physics
Managing Director
Sensors Technology Private Limited
AM-51, Deen Dayal Nagar
Gwalior, MP 474020, India
Phone: +91-751-2470680 / 5045715
Fax:+91-751-5045716
Email: [email protected]
http://sensorstechnology.tripod.com/
http://robotics_club_india.tripod.com/
Planning to visit Gwalior ? Information....
http://www.calindiatours.com/gwali.htm
=======================================