Baumer EXG03 User Manual

7
GlobalShutter2.1.2.1.
Pixel
Active Area (Photodiode)
Storage Area
Microlens
Global shutter means that all pixels of the sensor are reset and afterwards exposed for a
specied interval (t
exposure
).
For each pixel an adjacent storage area exists. Once the exposure time elapsed, the
information of a pixel is transferred immediately to its storage area and read out from
there.
Due to the fact that photosensitive surface get's "lost" by the implementation of the stor-
age area, the pixels mostly are equipped with microlenses, which focus the light to the
pixels active area.
RollingShutter2.1.2.2.
Reset Pointer
Readout Pointer
Pixels of Frame
(n-1)
– will be deleted
Currently exposed pixels (Frame
(n)
)
Read out pixels of current Frame (Frame
(n)
)
Rolling shutter means that – in contrast to the global shutter – not the whole sensor is
exposed at once, but single portions successively. It is said the shutter "rolls" over the
sensor�
For Baumer EXG cameras with rolling shutter this means two pointers are "rolling" across
the sensor:
First, the reset pointer deletes any information of former exposures stored within the ▪
pixels (Frame
(n-1)
). After that the pixels are empty and restart collecting information
from incoming light – the new exposure (Frame
(n)
) begins.
Once a predened interval – the exposure time t ▪
exposure
– is elapsed, the readout
pointer rolls across the sensor and the information of the pixels is read out.
For example: On Baumer EXG50, the pass of a pointer lasts approx. 72 msec ▪
(t
Full Frame
).
Due to technical issues of rolling shutter, a ash control depending on the
exposure time does not make sense. Such cameras should be used in a
continuously illuminated environment.
◄Figure5
Structure of an imaging
sensor with global shut-
ter (interline).
◄Figure6
Operating mode of a
rolling shutter.

Baumer EXG03 Specifications

General

Brand	Baumer
Model	EXG03
Category	Security Camera
Language	English