Readout Method (Scan Mode) - Hamamatsu Photonics C11440-22C Insctruction Manual

C11440-22C Instruction manual_Ver.1.4

10-2 READOUT METHOD (SCAN MODE)

(1) Normal readout
Perform charge readout from camera individually for all pixels.
The frame rate of all pixel readout is 100 Hz.
(2) Binning readout
With this camera, 2×2 binning readout and 4×4 binning are available by adding the
signal of adjacent pixels in the digital domain, and is a method of achieving high
sensitivity as a tradeoff for resolution. The frame rate of all pixel readout is 100 Hz
same as normal readout.
(3) Sub-array readout
Sub-array readout is a procedure in which only a region of interest is scanned. It is
possible to increase the frame rate by reducing the number of vertical lines scanned.
The fastest scan speed is achieved when a sub-array area is set in the center position
of the sensor. Sub-array vertical area width and its position can be set with every 4
vertical lines step.
Typical examples of vertical area width and frame rate are shown in the following.
number of pixels
2048 × 2048
2048 × 1024
2048 × 512
2048 × 256
2048 × 128
2048 × 64
2048 × 8
[Example (in Free running mode)]
When 2048 x 256 pixels area is set completely in the top half area of the sensor or
completely in the bottom half area of the sensor the frame rate becomes 401 frames/s
regardless of the actual position in the half of the sensor.
It is possible to achieve 802 frames/s if 2048 x 256 pixels area is in the center position
of the sensor.
[Calculating formula of the frame rate]
Free running mode
External control mode
Note
24
Frame rate at Center position (frame/s)
Free running mode
25 655
(9.74 × Vn/2) + Exp + 87.66 µs
Vn = the number of vertical lines (set in the center position of the sensor)
Exp = exposure time (1 ms to 10 s)
Calculate by inputting Exp into the formula in the unit of µs.
•
External control mode
100
200
401
802
1603
3207
1
Vn/2 × 9.74 µs
1
90
164
278
425
579
848
877