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Chapter 11: Shutter Control
This chapter provides information about the configuration and control of an external
shutter that is connected to a Lansis camera. Lansis cameras are not supplied with a
driver for internal or external shutter, and an external shutter driver is required to
operate the shutter. The timing information below will still apply, but the software then
controls the timing of the shutter pulse applied to a logic out MCX connector, which
should in turn be connected to the external shutter driver. You should select the
“Shutter Open” signal in the Trigger Out expander.
11.1 Configuration
Shutter information is configured within LightField on the Shutter expander.
illustrates a typical Shutter expander.
Figure 11-1: Typical Shutter Expander:
11.1.1
Mode
This parameter determines the shutter’s opening and closing behavior during an
experiment.
Depending upon the specific Trigger In
►
Trigger Response that has been selected,
supported Modes are:
•
Normal;
The shutter opens for exposure, and closes when complete.
•
Always Closed;
When selected, the shutter closes and remains in the closed position.
This mode is primarily used when acquiring a dark reference file. However,
Lansis typically runs at such a low temperature that a dark reference file is often
unnecessary.
•
Always Open;
When selected, the shutter opens and remains open for the experiment
duration.
This mode is typically used when an experiment does not support waiting for
the shutter to open. Ideally, the only light generated by the experiment is the
signal of interest (e.g., a dark chamber with a spark discharge.)
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