We propose a novel pull-in process using a preshaped input for the air gap control of a solid immersion lens-based near-field recording system. The input of the pull-in process is designed as a three-impulse input to reduce the residual vibration of the actuator and shorten the pull-in time. The three-impulse input is based on the characteristic of the actuator. The three-impulse input substitutes a ramp input and the handover process of the mode switching servo. Little residual vibration after the pull-in process makes this process possible. By this process, the settling time and overshoot of the pull-in process are reduced markedly.
Bibliographical noteFunding Information:
We wish to thank Dr. J. E. Dumont and Dr. C. Delcroix for their stimulating and helpful discussions. We also thank Mrs. D. Legrand for her careful preparation of the manuscript. Work realized under Contract of the Minist~re de la Politique Scientifique within the framework of the Association Euratom--University of Brussels--University of Pisa.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)