Matt,
Yes, There is a concern on the failure at least a single fault - but
I believe the IEC 825 requires a double fault protection, but others may
know more.
You would have to know what the faults of the micro are fail, on
fail off, is there a software routine that can cause the problem (and trust
me you don't want to go there.
If you knew how the micro failed and how it causes the laser to
exceed your permissible limits then rather than trying to figure out all
the ways the system could fail in a "laser hazardous mode", you may be able
to produce in your circuitry methods for fault protection. This circuitry
and the components that make it up would then become critical and controlled
components which would require tracking and verification.
Gary
-----Original Message-----
From: Matt Kilkenny [mailto:mkilke...@opthos.com]
Sent: Friday, June 15, 2001 11:21 AM
To: emc-p...@majordomo.ieee.org
Subject: Laser Safety
I have a question on lasers for ITE concerning IEC-825 and FDA requirements.
According to IEC, class 3b lasers have to have safety doors (interlocks).
Can automatic power reduction be used if you are not pumping the laser to a
3b class level of power. In other words, can we not put interlocks on the
system if the 3b laser power has been reduced to a 3a or class 1 level
through microprocessor limitating it? Or is their single fault concerns if
the microprocessor fails?
Thanks for any help,
Matt Kilkenny
mkilke...@opthos.com
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