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.

Library of Congress Subject Headings

Scanning systems; Optical scanners; Photocopying

Publication Date


Document Type


Department, Program, or Center

Electrical Engineering (KGCOE)


Titus, Albert

Advisor/Committee Member

Glazos, M.

Advisor/Committee Member

H. Reddy


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TK7882.S3 P49 1999


RIT – Main Campus