Electronic Shutter

Exposure time, also known as shutter speed, is the amount of time a camera's image sensor is exposed to light. For industrial cameras, it is specified in milliseconds or microseconds.
However, industrial cameras do not use mechanical shutters (as in SLR cameras), so the sensor is in principle permanently exposed through the lens, but modern cameras have an electronic shutter that resets the charges already accumulated on the sensor, thus also allowing controlled sensor exposure.

Exposure and object motion

A lens is used to map the object information onto the sensor pixels with pixel accuracy. If the object moves during the exposure time, the image information is not only exposed on a single pixel, but also on neighbouring pixels, depending on the direction of movement. This blurs the image in the direction of movement. Moving objects must therefore be photographed with a very short exposure time.

Typical exposure times and acceptable motion blur

Different tolerances are possible depending on the application. A blur of 0.5 to 2 pixels is usually no longer visible to the eye, but still has a negative effect on the accuracy of the measurement results. However, this value is sufficient for many standard applications. In practice, typical exposure times are often between 0.1 and 20 ms.