Title :
Vision based ultra-precision centering of optical fibers for microlens fabrication
Author :
Milton, Gareth ; Gharbia, Yousef ; Katupitiya, Jayantha
Author_Institution :
Sch. of Mech. & Manuf. Eng., New South Wales Univ., Sydney, NSW, Australia
fDate :
28 Sept.-2 Oct. 2004
Abstract :
An optical fiber is mounted on a precision spindle, that can be indexed as well as speed controlled, in readiness for precision microlens grinding. A cluster of piezoelectric actuators, mounted on the spindle itself, carry out the crucial task of centering the fiber. Together with the indexing carried out using the spindle drive motor, the piezoelectric actuators allow position and angle adjustments in two perpendicular plains to achieve complete centering. An imaging system, using sub-pixel localization methods and a high magnification lens, simultaneously senses the eccentricity and angular misalignment of the optical fiber. A closed loop multi-axis centering controller has been implemented to achieve eccentricities and angular misalignments within 500 nm and 0.02°, respectively.
Keywords :
closed loop systems; computer vision; grinding; microlenses; micromachining; optical fibre fabrication; position control; closed loop multiaxis centering controller; high magnification lens; imaging system; microlens fabrication; optical fibers; piezoelectric actuators; precision microlens grinding; precision spindle; spindle drive motor; subpixel localization methods; Focusing; Indexing; Lenses; Microoptics; Optical device fabrication; Optical fiber devices; Optical fiber sensors; Optical fibers; Optical imaging; Piezoelectric actuators;
Conference_Titel :
Intelligent Robots and Systems, 2004. (IROS 2004). Proceedings. 2004 IEEE/RSJ International Conference on
Print_ISBN :
0-7803-8463-6
DOI :
10.1109/IROS.2004.1389873