PSN-L Email List Message

Subject: Re: Not so simple photoelectrics, or are they?
From: ian ian@...........
Date: Thu, 31 May 2001 16:48:36 -1000

I've not followed this thread in detail so sorry if I'm repeating

About 8 years ago I was using a position measuring device made by Melles

Griot.  It used 4 photocells and calculated the centroid of the incident

beam.  It had an accuaracy of a few microns and cost a few thousand $.

The point being that it only used a few cells and centroided to
the position of the beam

Technology moves on, but it looks like they still make a similar

Ian Smith


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Larry Cochrane <cochrane@..............>