摘要
提出了一种新型的远距离微振动信号的测量和保真拾取系统。该系统基于迈克尔逊干涉仪结构,以窄线宽光纤激光器为光源,采用相位载波零差解调方案实现信号的还原。通过优化压电陶瓷堆(PZT)相位调制器驱动电路,有效地提升了系统的频率响应范围。通过引入移相电路提高了系统的信噪比。系统在50 Hz-4 kHz频率范围内线性度良好,输出信号的信噪比为60 dB,谐波抑制比为50 dB,系统的灵敏度为1×10-5rad／Hz1／2。
A novel interferometer, which directs to measure and pick up micro-vibration signal free of distortion, is proposed. The system is based on Michelson interferometer. It uses a fiber laser with narrow linewidth as light source, and adopts homodyne demodulation with phase generated carrier scheme to restore signal. The frequency response range is effectively widened through optimizing the driving circuit of PZT, which is used as phase modulator. And the signal to noise ratio （SNR） is increased with a phase shifter introduced. The system has a good linearity in the frequency range from 50 Hz to 4 kHz. The SNR and harmonic suppression ratio of output signal is 60 dB and 50 dB respectively. The sensitivity of the system is 1×10^-5rad/Hz^1/2.
出处
《量子电子学报》
CAS
CSCD
北大核心
2006年第4期551-554,共4页
Chinese Journal of Quantum Electronics
基金
安徽省优秀青年科技基金(04042045)资助项目
关键词
激光技术
光纤激光器
零差解调
PZT
微振动
laser techniques
optical fiber laser
homodyne demodulation
PZT
microvibration
