Basler SCOUT LIGHT User Manual download pdf (Page 29)

Functional Description

Basler scout light 21

4.2 Overview (slA750-60fm Only)

Each camera provides features such as a full frame shutter and electronic exposure time control.

The sensor chip includes gain controls, ADCs, and other digital devices.

Exposure start, exposure time, and charge readout 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.

Exposure start can also be controlled via an externally generated hardware trigger (ExTrig) signal.

The ExTrig signal facilitates periodic or non-periodic acquisition start. Exposure can be set for a

preprogrammed period of time.

Accumulated charges are read out when the programmed exposure time ends. At readout, the

accumulated charges are transported from the sensor’s light-sensitive elements (pixels) to the

sensor’s column buses (see Figure 7 on page 22). The charges from the bottom line of pixels in the

array are then moved into the analog processing section of the sensor. 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

Analog-to-Digital converters (ADCs).

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

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

through an FPGA and into an image buffer. All shifting is clocked according to the camera’s internal

data rate. Shifting continues in a linewise fashion until all image data has been read out of the

sensor.

The pixel data leaves the image buffer and passes back through the FPGA to an IEEE1394b link

layer controller where it is assembled into data packets. The packets are passed to a 1394b

physical layer controller which transmits them isochronously to an interface board in the host PC.

The physical and link layer controllers also handle transmission and receipt of asynchronous control

data such as changes to the camera’s parameters.

The image buffer between the sensor and the link layer 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 information in this section only applies to slA750-60fm cameras. For

information about the other camera models, see Section 4.1 on page 19.

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Basler SCOUT LIGHT User Manual Page 29