Title :
Dual numerical aperture confocal operation of moving fibre bar code reader
Author :
Roberts, D.A. ; Syms, R.R.A. ; Holmes, A.S. ; Yeatman, E.M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK
fDate :
9/16/1999 12:00:00 AM
Abstract :
A compact bar code reader using pre-lens scanning by a piezoelectrically-actuated vibrating optical fibre cantilever is demonstrated. Dual numerical aperture confocal operation, based on transmission of a guided mode and reception of cladding modes, is shown to be a simple method for increasing and separating the return signal
Keywords :
gradient index optics; mark scanning equipment; optical fibre filters; optical fibres; optical scanners; cladding modes; compact bar code reader; dual numerical aperture confocal operation; guided mode; moving fibre bar code reader; piezoelectrically-actuated vibrating optical fibre cantilever; pre-lens scanning; reception; return signal; transmission;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19991139
