This process happens in milliseconds, allowing thousands of sheets to be processed every hour with a high degree of accuracy. A sensor positioned on the opposite side detects the amount of light that passes through; the key is that the marks made by a pencil are graphite, which is opaque and absorbs light, while the empty bubbles allow light to pass through more readily.
How Future Scantron Technology Enhances Digital Assessment Accuracy
Conversely, an unfilled bubble allows light to pass through, creating a higher value. The Fundamentals of Optical Mark Recognition The operation of a scantron relies on the principle of contrasting light absorption.
A filled bubble absorbs the light, resulting in a lower value being registered by the sensor. If the scanner detects that no bubble in a specific zone is filled, or if it finds two bubbles filled simultaneously, it flags the question for review.
How Digital Assessments Are Evolving the Future of Scantron Technology
One common method is the detection of "no marks" or multiple marks in a single bubble. Once aligned, the sheet is pulled through the scanner by a sophisticated paper transport mechanism, similar to that of a high-speed photocopier, which ensures smooth passage without tearing or misalignment.
More About How does a scantron work
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