Camera Functional Description AW00089317000
50 Basler ace GigE
4.2 Overview Global Shutter With CMOS
Sensor
Valid for
acA1300-60, acA1600-60, acA2000-50, and acA2040-25
The camera provides features such as a global shutter and electronic exposure time control.
Exposure start and exposure time can be controlled
by parameters transmitted to the camera via the Basler pylon API and the GigE interface.
There are also parameters available to set the camera for single frame acquisition or
continuous frame acquisition.
via an externally generated "frame start trigger" (ExFSTrig) signal. The ExFSTrig signal
facilitates periodic or non-periodic acquisition start. Modes are available that allow the length of
exposure time to be directly controlled by the ExFSTrig signal or to be set for a pre-
programmed period of time.
Accumulated charges are read out of each sensor row when exposure of the row ends. At readout,
accumulated charges are transported from the row’s light-sensitive elements (pixels) to the analog
processing controls (see Figure 32 on page 51). As the charges move through the analog controls,
they are converted to voltages proportional to the size of each charge. Each voltage is then
amplified by a Variable Gain Control (VGC). Next the voltages are digitized by an Analog-to-Digital
converter (ADC). After the voltages have been amplified and digitized, they are passed through the
sensor’s digital controls for additional signal processing. The digitized pixel data leaves the sensor,
passes through an FPGA, and moves into an image buffer.
The pixel data leaves the image buffer and passes back through the FPGA to an Ethernet controller
where it is assembled into data packets. The packets are then transmitted via an Ethernet network
to a network adapter in the host PC. The Ethernet controller also handles transmission and receipt
of control data such as changes to the camera’s parameters.
The image buffer between the sensor and the Ethernet controller allows data to be read out of the
sensor at a rate that is independent of the data transmission rate between the camera and the host
computer. This ensures that the data transmission rate has no influence on image quality.
Note
The acA1300-60, acA1600-60, acA2000-50, and the acA2040-25 camera
models have a switchable shutter mode. For information, see Section 4.4 on
page 54 and Section 7.7 on page 118.
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