Forwarded for Bert Planting.
-------- Original Message --------
Subject: Re: Laser Safety
List-Post: emc-pstc@listserv.ieee.org
Date: Mon, 18 Jun 2001 06:59:41 +0200
From: Bert Planting <bert.plant...@asml.com>
Organization: ASML
To: Matt Kilkenny <mkilke...@opthos.com>
CC: emc-p...@majordomo.ieee.org
References: <0954d2e4fe26d411909100b0d022a345191...@mail.opthos.com>
Matt,
Because you are using a microprocessor limitating it this is not seen as
sufficient safe solution for reduction of the output by "safety" people
(based on my experience with US third parties).
Reduction should only be done by hardware and not by fault sensitive
microprocessor.
In this case you should use an interlock.
regards,
Bert Planting
Prodct safety ASML
Matt Kilkenny wrote:
>
> 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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