The design of a stepper motor control-based high-precision varifocal imaging optical system

Bai Xiang

doi:10.1117/12.981933

26 November 2012 The design of a stepper motor control-based high-precision varifocal imaging optical system

Bai Xiang

Proceedings Volume 8557, Optical Design and Testing V; 855714 (2012) https://doi.org/10.1117/12.981933
Event: Photonics Asia, 2012, Beijing, China

Abstract

This study, while introducing the theories and makeup of conventional cam varifocal system, indicates the two faults stemming from their inherent mechanism and potentiometer-based focal-length measurement: 1) inability to stop optic axis vibration and 2) considerable error in real-time output of focal-length value. As a result, a stepper motor, instead of cam mechanism, was employed to control mirrors of variofocus and mirrors of compensation in moving accurately along straight-ling rails so that continuous focal-length variation and surface image positioning were accomplished; a linear encoder was substituted for potentiometer in realizing real-time output of focal-length value and also in closed-loop control of stepper motor. Compared with the cam mechanism, this system provides 90% less vibration and 80% more positioning precision, thereby basically solving the problems of the cam system and enabling the high-precision angular measurement.

Citation Download Citation

Bai Xiang "The design of a stepper motor control-based high-precision varifocal imaging optical system", Proc. SPIE 8557, Optical Design and Testing V, 855714 (26 November 2012); https://doi.org/10.1117/12.981933

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