HotShot SC User Manual
Rev 1.2.5 –March 2012
© NAC Image Technology Inc
Jimmy Robinson
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You can define the TTL state used to trigger the camera via the Trigger BNC
connector.
For a Make Switch you should use HIGH to LOW, which is the default setting.
6.10 Double Exposure Mode
The
HotShot SC Cameras
can operate a Double
Exposure Mode. In this mode the camera will take
pictures in “pairs” with the inter frame time
between the pairs being very SMALL. This is
particularly useful for Particle image velocimetry
(PIV) applications. To Enable / Disable Double
Exposure Mode right click the camera in the item
list and click Double Exposure. If Double Exposure is ON then a TICK will be
displayed net to the menu item.
In Double Exposure mode, the first image is exposed with for the time specified by
the exposure setting. The second image is exposed for the duration of the specified
Frame Period. The Time period betewwn the two exposures is < 15 nano seconds.
The opreration is illustrated below :
Example
Frame Period = 500us
Frame Period = 500us
Double Exposure
AOI = 512x512
Start
Start
FPS = 2000
<---
EXP=250us
--> <---------------
EXP=500us
-------------->
EXP1 = 250us
End
End
EXP2 = 500us
Readout=250us
Readout=250us
When Double Exposure Mode is used you can see a ‘DX’ indicator in the Frame
Annotation next to the Shutter Speed indication.
6.11 Comments
You can assign a comment to a camera by selecting the ADD/EDIT Comment Menu.
This comment will be displayed in the Frame Information superimposed on the
image.
