RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 48
The camera link control signal CC1 or external signal can be used to implement the trigger function.
Multiple RMV cameras can by synchronized with the CC1 signal.
In the trigger mode this is accomplished by sending the same trigger signal to multiple cameras at the
same time.
Exposure control is performed differently for free run and trigger readout.
Free Run exposure control
is set in lines of erasure. Consider the CCD sensor in free run mode. The
sensor is exposing its photodiodes with a new image while at the same time the previous image is being
read from the storage CCD. Because of the reading of the previous image the timing of the electronic
shutter can only happen during the horizontal line blanking. Thus the electronic exposure can only hap-
pen once every line. This results in a free run exposure time resolution of one line time. Now consider
that the exposure of the new image starts at the first line of readout and continues until the electronic
shutter signal is asserted. The time of the electronic shutter is defined as a line of readout. Thus the
exposure time is set as the number of lines to erase, with the electronic shutter.
Erasure
Pulse
Image
Transfer
Free Run exposure example: Long exposure
Erasure
Pulse
Image
Transfer
Free Run exposure example: Short exposure
Unused
(Erased)
Exposure
# lines of
erasure
# lines of
erasure
Time
Erasure
Pulse
Image
Transfer
Unused
(Erased)
Exposure
# lines of
erasure
Time
Erasure
Pulse
Image
Transfer
Unused
(Erased)
Exposure
# lines of
erasure
