Multiple document detection with ultrasonics

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Title: Multiple document detection with ultrasonics
Author: Phinney, Daniel
Abstract: The purpose of this thesis was to develop a method to detect the occurrence of more than one document being drawn into an automatic document feeder such as is used on photocopiers and document scanners. It was desired that the method developed made no physical contact with these documents, worked with all common document materials and thicknesses. The method actually developed monitors the amplitude and phase changes in ultrasound passed through these documents. By using both the amplitude and phase of the ultrasound, a material and thickness independent method, non contact method was successfully developed.
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Date: 1999-05

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