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MultiCam Boards Documentation > MultiCam Documentation > MultiCam User Guide > General Topics > Cameras Topics > Line-Scan Camera Topics > Permanent Exposure

Permanent Exposure

In the permanent exposure situation, the line-scan CCD sensor is never brought into the reset condition.

The line-scan camera hosting the sensor experiences a periodical cycle paced by successive instants we will refer to as "line reset". The line reset pulses occur at the line frequency. Each line reset causes a transfer gate event followed by a readout process.

The line reset pulses are issued by the frame grabber in a programmable way.

Permanent exposure operational sequence

Between two successive line reset pulses, the sensor integrates the light. The sensitivity of the camera depends on the line period separating the pulses. The lower the line frequency, the higher the response to a given scene.