ACQUIRING DATA
iKon-L SECTION 5
Page 57
Fast Kinetics allows exposure times on a microsecond timescale. Use Fast Kinetics when you need an
exposure time that is smaller than the minimum Kinetic Cycle Time in a standard Kinetic Series. In Fast
Kinetics the image to be recorded is imaged across a certain section of the CCD. The non-illuminated part of
the CCD is used for storage of image before readout. You must ensure that light does not fall on this storage
part of the CCD by using, for example, an imaging spectrograph. By way of explanation, take the example of
an illuminated sub-area of height 8 rows. A CW spectrum is imaged along this sub-area and the resulting
image is then shifted down 8 rows into the non-illuminated area, thus sampling the image in time. In this way
the image is temporarily stored on the CCD itself, rather than in the computer. The process is repeated until
the frame of the CCD is filled with time-sampled images or until the number of images you have specified for
your series has been acquired. Next each image is transferred into the shift register in turn, and read out in the
normal way. With a CCD-chip of height 512 pixels and a sub-area height of 8 rows, 63 discrete images can
be stored on the CCD (not 64 images, since the top 8 rows of the CCD constitute the illuminated sub-area,
which cannot be used for storage.)
From the Setup Acquisition dialog box, you can change the following parameters:
• Exposure Time (usecs): the Exposure Time also represents the cycle time of the Fast Kinetics
series. There is no separate parameter for a Fast Kinetics cycle time
• Sub Area Height: in rows
• Number in Series: the number of time-sampled images you want to acquire
• Binning: specifies the amount of horizontal and vertical binning to be applied to the images in the
series
• Offset: the active area from the bottom of the detector can also be specified
NOTE: Only available in Image readout mode
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