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
clockwise increases it. The Dwell Time can be adjusted between approximately 100 microseconds
and 10 milliseconds.
The Horizon adjusts the “Protected Area” (if Switch 3 is moved to the “on” position). At the
factory, Pangolin sets this control to approximately the center of the vertical scan field, but this
may be adjusted clockwise or counter-clockwise to set the horizon of the protected area as desired.
Note that this control is very sensitive to rotation. You will not need to turn this control very much
to explore the entire vertical area. Also note that the horizon adjustment is completely ignored if
Switch 3 is turned off. (See the section about PASS Switches for more information.)
The “Maximum Safe Beam Power” adjustment controls the maximum power that can be allowed
into the “Protected Area”. For example, if the beam is scanning within the audience area, PASS will
monitor the beam power and make sure that this beam power is not exceeded. If the beam is not
scanning within the “Protected Area” (for example, above the horizon), then this control is ignored
and full-power beams can be projected overhead.
The “Minimum Power” adjustment controls the minimum light level that is detectable by the light
sensor. Generally this is adjusted so that no light is detected by PASS when the laser is off.
You can adjust the “Maximum Safe Beam Power” and “Minimum Power” adjustments by looking at D208
“Light Sensor State” bi-color LED on the PASS board.
Also note that the “Maximum Safe Beam Power” and “Minimum Power” adjustments are ignored if the
switch 4 is turned “on” (see switches on page 20).
PASS Adjustment Procedure
NOTE: The information contained in this section must be understood and followed very
carefully in order to ensure that PASS operates correctly, and to minimize the risk of an
unsafe laser exposure.
Since the procedure described below involves projecting patterns into an area that an audience will
eventually occupy, and since the light levels experienced during adjustment procedure may exceed the
MPE under some circumstances, it is highly recommended that you perform the procedure below when
the venue is only occupied by trained technical staff, and communicate very clearly when the laser will
be turned on so that staff will know how to react. To avoid the possibility of illuminating people who may
not understand the technology or potential risks that a laser projector may present, the adjustments and
procedures described below should preferably be done in a laboratory environment, not in the venue
where personnel (for example waitresses, etc.) may be walking around before the venue opens.
Step 1: Adjust the Horizon (whether you will ultimately use it or not)
During this first test, it is important to use the lowest amount of laser power possible. This will reduce the
chance of illuminating personnel that might be in the room during these tests. For the next few tests and
adjustments, the beam power is best reduced by using the software brightness level setting – rather than
potentiometers that might reside on the back of a laser projector.
First, set PASS Switch 3 to “Protect only the bottom portion” (switch moved to the left, if the board is