An analog notch filter for piezoelectric optical scanner

doi:10.1007/s12200-010-0120-y

Front Optoelec Chin

2010, Vol. 3

Issue (4) : 370-375 https://doi.org/10.1007/s12200-010-0120-y

RESEARCH ARTICLE

An analog notch filter for piezoelectric optical scanner

Xin WU¹(

), Sihai CHEN^1,2, Xiaogang XIONG¹, Benyi SHI¹, Wei CHEN¹

1. College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China

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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

Corresponding Author(s): WU Xin,Email:laser_hust@foxmail.com

Issue Date: 05 December 2010

Cite this article:

Xin WU,Sihai CHEN,Xiaogang XIONG, et al. An analog notch filter for piezoelectric optical scanner[J]. Front Optoelec Chin, 2010, 3(4): 370-375.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-010-0120-y
https://academic.hep.com.cn/foe/EN/Y2010/V3/I4/370

Fig.1 Piezoelectric scanner. (a) Structure; (b) work principle

Fig.2 Block diagram. (a) Performance test bench; (b) swept-sine waveform generator

Fig.3 Piezoelectric optical scanner. (a) Static performance; (b) dynamic performance

Fig.4 Schematic of single notch filter

Fig.5 Ideal transfer function. (a) Magnitude-frequency characteristic; (b) resistance difference impact on the gain at center frequency

Fig.6 Notch filter in series. (a) Pspice simulation result; (b) magnitude-frequency characteristics measured

Fig.7 Hysteresis compensated laser scanner with and without notch filters at linear scanning of 100 Hz. (a) Scanning waveforms; (b) non-linearities

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