Last update: 2021/04/27 20:10
safety:pass
https://wiki.pangolin.com/doku.php?id=safety:pass
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Printed on 2022/07/28 09:15
reduce the beam power, these adjustments should be set all the way at maximum, so that the power
level coming out of the laser projector is entirely controlled by the software input.
Now – in the Projector Settings dialog box, make sure that the brightness level is turned down – perhaps
to 10%.
Slowly move the Y Position control upward, until the beam hopefully becomes visible. If the beam does
not become visible after a substantial upward movement of Y Position, then adjust the brightness level
upward until a beam is seen.
Now, using a laser power meter that has a 1 square centimeter (or approximately 11mm round) detector,
place the detector of the power meter into the stationary beam – AT THE CLOSEST POINT OF AUDIENCE
ACCESS. It might be handy to mount the detector head of the power meter onto a tripod stand, so that it
can be held into the stationary beam.
The laser beam should be larger than the 1 square centimeter power meter detector area. If it is not,
then you will need to increase the divergence of the laser beam, for example, using one of Pangolin’s
SafetyScan lenses. (A beam smaller than 11mm round in the audience will certainly not be safe, unless
the power is around 10 milliwats…)
When the laser beam is larger than the 1 square centimeter active area on the power meter, then the
power meter will read in terms of Watts Per Square Centimeter (also known as “irradiance”), instead of
Watts (also known as “radiant power”). This is an important concept that must be understood. The laser
safety standards are based on irradiance, not radiant power!
Using the software brightness control, increase the beam power upward and upward and upward until
the laser power meter reads the desired level of irradiance – according to the MPE that you are trying to
accomplish. Although PASS allows for a large degree of adjustment, laser industry best practices
generally assume that the irradiance will be no greater than 10 milliwatts per square centimeter for a 1
millisecond pulse width described below.
Now that you have determined the maximum brightness level that the software can output to accomplish
the desired irradiance, you should write this down on a piece of paper, or otherwise record it. For
example, this might be a brightness level of 27%. This means that you will need to paint a brightness
level of 27% into the Beam Attenuation Map, or use other software features to ensure that the beam
power never exceeds the maximum safe power level determined in this step.
Step 3: Enable the light sensor, and adjust the Maximum Beam Power
potentiometer
Adjust the Maximum Beam Power potentiometer on PASS, many turns clockwise. The idea is to set this to
a level that won’t immediately trip once you enable it using Switch 4.
Now, go to the Abstract Generator and increase the size to project a circle. Any other pattern may be
projected, but it’s best to keep the pattern simple.
If you have done everything correctly and followed the instructions carefully, at this point you should see