Pco dicam C1, Руководство пользователя

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8.3 INTENSIFIER CONTROL
LIGHT DAMAGES IMAGE INTENSIFIER
Too much light input during exposure time (gate ON) lowers the
lifetime of the image intensifier.

Be careful with all kinds of light sources, a few milliseconds
can be enough to damage the image intensifier irreversibly.
Intensifier Voltage
Select the amount of the MCP-Gain of the image intensifier.
Adjustable is the voltage applied to the MCP (micro channel
plate) in the range of 750 V to 1100 V for S20 image intensifiers
and 750 V to 900 V for GaAs(P) intensifiers. The other two
intensifier voltages for photocathode and phosphor screen are
fixed and cannot be changed by the user.
Note that there is no linear correspondence between the MCP
voltage and the amount of Gain. The Gain is exponential and
typically doubles every 50 V.
The graph shows exemplarily the signal output curve for constant
light input in dependence of the applied
Intensifier Voltage
for an
S20 image intensifier equipped pco.dicam C1.
Note:
start with maximum
Intensifier Voltage
,
closed aperture and very short exposure times at
each experimental setup to protect the image
intensifier (see chapter
2.1 – safe use of image
intensifier).
Gating Mode
Setting for the operating mode for the MCP part of the image
intensifier, which controls the extinction ratio contribution (shutter
ratio) of the MCP.
Especially uv and blue light is blocked less effectively outside the
selected exposure time of the image intensifier. This light leakage can
negatively influence the image acquisition!
To prevent this negative effect, the MCP
Intensifier Voltage can be
switched off outside the photocathode exposure time window to
increase the system overall extinction ratio.
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NOTICE