Pco pixelfly qe, Operating Instructions Manual

Page: 23 / 40

3. Timing
23
!
PCO 2006
pixelfly
DoubleShutter Mode (only XD-Version)
Two separated full frame images with a short interframing time
can be captured. The length of the first exposure time will be
done by software input, the triggering either internally by soft-
ware or by an external trigger signal. The exposure time of the
second image corresponds to the readout time of the first im-
age. It depends of the used CCD sensor and binning mode.
During the interframing time t
d
(dead time) no exposure should
be done
The following signals /BUSY, /CCD-Exposure and /CCD-
Readout are at the 26-pin. HD-DSUB socket of the PCI-Board.
Exposure
Image 1
Internal
Delay
Exposure
Image 2
External Trigger
Readout Time 1 Readout Time 2
/ BUSY
/ CCD-Exposure
Real exposure
on CCD sensor
/ CCD-Readout
Image 1 Image 2
timing not scaled
t
di
10...20µs
t
exp1
5µs...65ms
t
j1
0...5µs
t
j2
300...700µs
t
j3
0...3µs
t
d
2µs
t can be set to 10µs...10ms by software.
exp1
exposure time of image 2 (t ) = readout time of image 1
exp2
Example To set two laser pulses in a short time one after another (about
10µs), the following relation is valid. The timing of the first laser
pulse starts with the falling edge of /BUSY (respect. /CCD-
Exposure). The first laser pulse must be set at the end of image
1, the second laser pulse at the beginning of image 2.
– t 1. laser pulse = t
exp1 j1
2. laser pulse = 1. laser pulse + t + (t
j1 d
+ t )
j3
CCD Readout Time The CCD readout time depends of the CCD sensor and of the
selected binning:
pixelfly qe V1-Binning 88,3ms
$
0,5
V2-Binning 44,8ms
$
0,5