【作者】 俞本立； 吴许强；

【Author】 YU Benli WU Xuqiang (Provincial Key Laboratory of Information Materials and Devices, Anhui University 230039)

【机构】 安徽大学信息材料与器件省重点实验室；

【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50Hz-4KHz频率范围内线性度良好,输出信号的信噪比为60dB,谐波抑制比为50dB,系统的灵敏度为1×10-5rad/Hz1/2。更多还原

【Abstract】 A novel interferometer, which directs to measuring and picking 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 50Hz to 4KHz. The SNR and harmonic suppression ratio of output signal is 60dB and 50dB respectively. The sensitivity of the system is 1×10~5rad/Hz1/2.更多还原