Basler A400K Bedienungsanleitung PDF herunterladen (Seite 27)

AW00118501000 Camera Functional Description

Basler racer Camera Link 19

4 Camera Functional

Description

This chapter provides an overview of the camera’s functionality from a system perspective. The

overview will aid your understanding when you read the more detailed information included in the

later chapters of the user’s manual.

Each camera employs a single line CMOS sensor chip designed for monochrome imaging. For 2k

cameras, the sensor includes 2048 pixels. For 4k cameras, the sensor consists of two 2k sensor

segments, resulting in a total of 4096 pixels.

Line start can be controlled by trigger signals transmitted to the camera via the Camera Link

interface. Modes are available that allow the length of exposure time to be directly controlled by the

line start signal or to be set for a pre-programmed period of time.

Accumulated charges are read out of the sensor when exposure ends. At readout, accumulated

charges are moved from the sensor’s light-sensitive elements (pixels) into the analog processing

section of the sensor (Fig. 4 on page 20). As the charges move from the pixels to the analog

processing section, they are converted to voltages proportional to the size of each charge. The

voltages from the analog processing section are next passed to a bank of 12 Bit Analog-to-Digital

converters (ADCs).

Finally, the gray values pass through a section of the sensor where they receive additional digital

processing and then they are moved out of the sensor. As each gray value leaves the sensor, it

passes into an FPGA (Fig. 5 on page 20). Up to this point, all shifting is clocked according to the

camera’s internal clock speed.

The gray values are then transmitted via the Camera Link interface to the frame grabber in your PC.

Several different "Camera Link tap geometries" are available to determine how the pixel data will

be transmitted over the Camera Link interface. The user can select the desired Camera Link tap

geometry. See Section 7.2 on page 73 for more detailed information about Camera Link tap

geometries.

The user can also select from several available pixel clock speeds for the Camera Link interface.

See Section 8.1 on page 75 for more information about selecting the pixel clock speed.

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Basler A400K Bedienungsanleitung Seite 27