Any remote possibility of a reflective surface diverting the beam to a
place where someone could look at it? I think 'stare' is not a good
word: I would suggest 'look' for simplicity, but TC82 probably wouldn't
agree. There is a time element: 'glance' = 1 s, 'look' = 10 s, ''stare'
= 30 s. A 'look' may be long enough to cause permanent damage.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-01-21 20:48, Charlie Blackham wrote:
All
Class 2 lasers are required to be fitted with a warning against
staring directly into the beam
Whilst “stare” is not defined in EN 60825-1, the following is stated
However, dazzle, flash-blindness and afterimages may be caused by a
beam from a Class 2 laser product, particularly under low ambient
light conditions. This may have indirect general safety implications
resulting from temporary disturbance of vision or from startle
reactions. Such visual disturbances could be of particular concern if
experienced while performing safety-critical operations such as
working with machines or at height, with high voltages or driving.
Users are instructed by labelling not to stare into the beam, i.e. to
perform active protective reactions by moving the head or closing the
eyes and to avoid continued intentional intrabeam viewing.
The application I’m looking at involves a wireless connected laser
distance measuring device making an automated measurement every 12
hours of the distance to a structure or tunnel wall for example.
Provided that it is not installed in a location where someone could
experience an unsafe startle reaction, as discussed above, are there
any other issues I should be looking at and anything to prevent the
installation of such an automated device?
Thanks
Charlie
*Charlie Blackham*
*Sulis Consultants Ltd*
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