RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 57
4.2.3: Exposure:Trigger Modes
TDE: Triggered Double Exposure
TDE
mode uses the trigger pulse to capture two
images in rapid succession. This is accomplished by
capturing the first image in the Photo Diodes, transferring
this image to the vertical CCD, and then capturing a sec-
ond image in the Photo Diodes. The first image is read
from the CCD as the second image is exposed. The
second image is then transferred and read from the CCD.
The second image exposure is fixed to the readout time
of the first image.
Serial Commands
Target
Index
Command
R/W
Description
04
03
Readout Mode Select
W
0x0003 = Triggered Double Exposure
02
04
Transfer Pulse Delay
R/W
0x0007 to 0xFFFF
04
1B
Transfer Pulse Width
R
0x0004 = TPW (Preset at factory)
02
00
Set Trigger ms
W
Set TR time in milliseconds * 100
02
01
Set Trigger us
W
Set TR time in us
02
00
Get Trigger ms
R
Return actual time in milliseconds * 100
02
01
Get Trigger us
R
Return actual time in us (0xFFFF = to large).
02
0E
TPD resolution
R/W
0x0000 = 4 clock periods
0x0001 = 16 clock periods
0x0002 = 64 clock periods
0x0003 = 1024 clock periods
Quick FAQ’s:
►Use the TDE mode with external illumination con-
trol to grab two closely timed images.
►The rising edge of the trigger pulse determines the
beginning of first exposure.
►The strobe signal can be used to determine frame
timing.
►The strobe signal is only valid for the first frame.
►
The Transfer Pulse Width (TPW) can be used to
minimize the frame to frame timing.
Trigger
Image 1 Exposed
As TPE cycle
Exposure
FVAL
Image 2
Exposed
Image 1
Read out
Image 2
Read out
Image 1
Transferred
Image 2
Transferred