The precision improvement of the scanner in optical scanning imaging system

✍ Scribed by Jiying Xiang; Zhen Wu; Ping Zhang; Dexiu Huang; Gaoshang Wei

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 242 KB
• Volume: 30
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(98)00023-1

✦ Synopsis

A disadvantage of using a galvanometer as the horizontal scanner in CSOM and OCT is its nonlinear distortion caused by the rotational inertial. This is inevitable even if a closed loop is equipped. Here, a second closed loop is introduced to provide pixel clocks to reduce the pincushion distortion of the images. A subdivided step motor is employed to be the vertical scanner as the result of price consideration. Nonetheless, the conventional linearity model of the peck torque with a winding current relationship is no longer in agreement with the experiment when the winding current is low, while a parabolic model is more likely to be reasonable. Relational treatment is proposed in the paper. Both methods have proved to be good enough to meet the requirement of a super resolution scanning imaging.