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MultiCam Boards Documentation > MultiCam Documentation > MultiCam User Guide > General Topics > Cameras Topics > Common to Area-Scan and Line-Scan > What is Exposure?

What is Exposure?

In order to build an electrical signal representing the light intensity at a given point of a scene, the CCD sensor photosite should be exposed to the light during a certain amount of time. This amount of time is known as the exposure time, also called the integration time.

The quantity of electrical charge built during the exposure process is proportional to the incoming light intensity and to the exposure time.

In the CCD sensors that can be used for industrial imaging, all the pixels experience simultaneously the exposure condition. This means that the exposure starting and stopping instants are common to all photosites.

The accurate control of the exposure time is a feature that applies to all line-scan sensors, and to most area-scan sensors. The area-scan CCD sensor type that performs best in this respect is the interline transfer CCD sensor.