Specifications

90 ST-133/ST-133A Controller Manual Version 2.H

progress.

Part 3 of Figure 46 shows the transfer to the readout register continuing. Two cells in each

column are shown empty, indicating the continuing downward movement of charge. The

charges are moved to the readout register and from there out of the array for further

processing. The process continues until the storage cells’ contents have been completely

transferred out of the array. The imaging cells are electronically switched off and do not

accumulate any charge as the readout takes place. Because this scheme is less time efficient

than that used in the overlapped mode, the frame rate may be lower in non-overlapped

operation than it is in overlapped operation with the some exposure time settings.

Part 4 of Figure 46 illustrates the situation at the end of the readout. Both the imaging and

storage cells are empty. In Freerun operation, the imaging cells will be switched back on

immediately, allowing charge accumulation to begin. In Ext Sync operation with no PreOpen,

they are not switched back on until after the External Sync pulse is detected.

Empty Readout Register Readout Register with charge

from first cell in each storage

One cell shifted down

to Readout Register.

Transfer Image to

Storage Registers

Empty Output Register. All

charges have been shifted to

output.

Readout Register with charge from

second cell of each storage register.

Storage Cell

Imaging Cell

Output Register Cell

Charge Absent

First Exposure Charge

Second Exposure Charge

All charges transferred.

Storage registers empty.

Second cell shifted

to Readout Register.

Figure 46. Non-overlapped mode Exposure and Readout