Readout; Figure 5-18: Emccd Array Structure - Teledyne ProEM Series System Manual

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5.4

Readout

The ProEM:512B/512BK and ProEM:1024B models use frame transfer CCDs with
512x512 and 1024x1024 active pixels, respectively. These frame transfer CCDs also have
an equivalent number of frame transfer or masked pixels as shown in

Figure 5-18: EMCCD Array Structure

Multiplication Gain
For standard, high dynamic
ProEM System Manual
Clean Before Exposure {Clean Before Exposure} is only provided for cameras
that have a Frame Transfer CCD and is only available for selection when in Full
Frame mode is active. Normally, cleaning occurs until the acquisition starts.
When Clean Before Exposure is active, cleaning occurs up until acquisition
starts and the entire CCD will be cleaned once right after the readout occurs. It
is a clean operation for the next exposure and it matters only when multiple
images are taken with a short exposure time.
NOTE:
Clean Before Exposure is not relevant when using a
triggered mode.
Continuous Cleans {Clean Until Trigger} is available when the start of exposure is
tied to an external trigger.
— In WinX/32, this cleaning becomes active when External Sync timing mode
is selected.
— In LightField, it becomes active when Trigger Response is set to Readout Per
Trigger or Shift Per Trigger.
Figure 6-6 on page 93 illustrates a timing diagram for LightField's Clean Until
Trigger.
Skip Serial Register Clean (deselected) {Clean Serial Register} The Top margin
inactive parallel strips on a CCD are made up of the dark pixels that come
before the active strips on a sensor as they exit to the serial register. When these
are available (i.e., Pre Dummies {Top Margin} > 0), they serve the purpose of
cleaning the serial register before readout of the active strips. In LightField, if
there are no inactive parallel strips (i.e., {Top Margin} = 0), selecting Clean Serial
Register forces a clean of the serial register before readout of the active strips.
Extended Multiplication Register
Output or Sensor Node High Voltage Clock
Readout
Amplifier
For high speed, low
light level applications applications
Normal Voltage Clock
Standar d Serial Register
Low Noise
range applications
Readout
Amplifier
Output or Sensor Node
Frame-transfer Area
Sensor Area
ProEM:512B/1024B EMCCD
Frame-transfer Area
Sensor Area
Masked Area
Sensor Area
ProEM:512BK EMCCD
Issue 3
Figure 5-18.
Sensor Area
2 4
ProEM:1600 B/1600 B EMCCD