An analog notch filter for piezoelectric optical scanner

Abstract

The optical scanner is one of the most important components in free-space optical communications, airborne and space-based lidars, adaptive optics, and so on. The performance of an optical scanner is frequently limited by the presence of mechanical resonances. This paper presents an analog notch filter with adjustable function to reject the mechanical resonances of the optical scanner. First of all, the structure and work principle of the piezoelectric optical scanner are introduced. Furthermore, the frequency sweep method based on virtual instrumentsβis used to gain the natural frequency of the piezoelectric optical scanner. Then, the notch filters in series are used to reduce the oscillation of the scanner at the resonance frequencies. A variety of scanning experiments were carried out. After the introduction of the notch filter, the non-linearity was reduced to±1.1% from±2.1%. The linearity performance was greatly improved.

Keywords

piezoelectric optical scanner / mechanical resonance / swept-sine waveform generator / notch filters / scan non-linearity

References

[1] Xu M, Hu J S. Analysis and calculation of rotating polygonal scanner in laser scanning imaging system. Chinese Journal of Lasers, 2008, 35(5): 782–787 (in Chinese)

[2] Wang X Q, Liao S, Hung J M. Study on the amplitude-frequency performance testing and position demarcating of optical scanner. Opto-Electronic Engineering, 2004, 31(z1): 73–79 (in Chinese)

[3] Wu Q Y, Wang Q, Peng Q, Ren G, Fu C Y. Wide bandwidth control of fast-steering mirror driven by voice coil motor. Opto-Electronic Engineering, 2004, 31(8): 15–18 (in Chinese)

[4] Ling N, Chen D H, Guan C L. Two-dimensional piezoelectric fast steering mirror. Opto-Electronic Engineering, 1995, 22(1): 51–60 (in Chinese)

[5] Claeyssen F, Le Letty R, Barillot F, Lhermet N, Fabbro H, Guay P, Yorck M, Bouchilloux P. Mechanisms based on Piezo actuators. Proceedings of SPIE, 2001, 4332: 225–233

[6] Bouchilloux P, Claeyssen F, Le Letty R. Amplified piezoelectric actuators: from aerospace to underwater applications. Proceedings of SPIE, 2004, 5388: 143–154

[7] Claeyssen F, Lhermet N, Le Letty R, Barillot F, Debarnot M, Six M F, Thomin G, Privat M, Bouchilloux P. Piezoelectric actuators and motors based on shell structures. Proceedings of SPIE, 2000, 3991: 202–209

[8] Le Letty R, Claeyssen F, Lhermet N, Bouchilloux P. New amplified piezoelectric actuator for precision positioning and active damping. Proceedings of SPIE, 1997, 3041: 496–504

[9] Ge P, Musa J. Generalized Preisach model for hysteresis nonlinearity of piezoceramic actuators. Precision Engineering, 1997, 20(2): 99–111

[10] Li X Y, Ling N, Chen D H, Yu J L. Stable control of the fast steering mirror in adaptive optics system. High Power Laser and Particle beams, 1999, 11(1): 31–36 (in Chinese)

[11] McPeak S. Create a swept-sine function in LabView with just one virtual instrument. EDN, 2009, <month>June</month>25: 43–52

[12] Maxim. 4th- and 8th-order continuous-time active filters. Maxim Integrated Products, 1996, 19-4191: 11–17

Acknowledgements

This work was supported by the Program for New Century Excellent Talents in University of China (No. NCET-07-0319).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg