Chapter 6
Advanced Topics
101
6.4.2
Kinetics Timing Modes and Shutter Control
For Kinetics, the timing modes are Free Run {No Response}, Single Trigger {Readout Per
Trigger}, and Multiple Trigger {Shift Per Trigger}. Free run {No Response} mode is used
for experiments that do not require any synchronization with the experiments. The
other two modes (i.e., Single Trigger and Multiple Trigger,) require that an external TTL
pulse be applied to the camera via the Trigger In connector on the I/O cable. The
camera can be triggered either on +ve {Positive} or -ve {Negative} edge of the incoming
TTL pulse.
In the Free Run Kinetics mode, the ProEM takes a series of images, each with the
Exposure time set through the software (in WinX/32, the exposure time is set on the
Experiment Setup
►
Main tab). The time between image frames, which may be as short
as a few microseconds, is limited by the time required to shift an image under the mask.
This inter-image time equals the Vertical Shift rate (specified in ns/row) multiplied by
the Window Size (the number of rows allocated for an image frame). The exact number
of frames depends on the selected Window Size and is equal to the number of pixels
perpendicular to the shift register divided by the Window Size. Integrate signals
(SHUTTER) or Readout signals (READ OUT) are provided at the LOGIC OUT connector
for timing measurements.
The Shutter Control options are Normal, PreOpen {Open Before Trigger}, Disabled
Open {Always Open} and Disabled Closed {Always Closed}. Normal means that the
Shutter opens at the beginning of the first exposure-shift kinetics cycle and closes at
the end of the last exposure-shift cycle. Disabled simply means that the shutter will not
operate during the experiment. Disabled closed is useful for making dark charge
measurements. PreOpen {Open Before Trigger}, available in the External Sync and
External Sync with Continuous Cleans {Clean Until Trigger} modes, opens the shutter as
soon as the ProEM is ready to receive an External Sync pulse. This is required if the time
between the External Sync pulse and the event is less than a few milliseconds, the time
it takes the shutter to open.
6.4.3
Triggered Operation
In Single Trigger {Readout Per Trigger} mode, the camera requires only one trigger to
initiate an entire series of exposure-shift cycles as shown in
. Here, the
camera uses the exposure time as entered into the software. The trigger is applied at
the Ext Sync connector on the rear of the ProEM.
Figure 6-13: Timing Diagram: Kinetics Mode, Single Trigger {Readout Per Trigger}
~500 ms @ 1 MHz readout
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Summary of Contents for ProEM Series
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