摘要
依据双频激光干涉信号的特征,针对包含20 MHz激光信号频差、±16 MHz多普勒频移和632.99 nm波长信息的光信号,设计了5通道光信号采集与硬件处理电路。该方案采用雪崩光电二极管(APD)实现70 nW~7μW弱光信号的高速光/电转换,通过5阶切比雪夫差分带通滤波器抑制带外噪声,并利用自动增益控制(AGC)电路对不同光功率信号进行动态补偿。测试结果表明:该板卡使信号信噪比提升约25.78 dB,在0.1~20 mm/s速度范围内实现了高于2048的电子细分数,位移测量分辨力达到亚纳米级,显著提升了系统的测量精度与动态响应能力。
According to the characteristics of dual-frequency laser interference signal,a 5-channel optical signal acquisition and hardware processing circuit is designed for the optical signal containing 20 MHz laser signal frequency difference,±16 MHz Doppler frequency shift and 632.99 nm wavelength information.The scheme uses avalanche photodiode(APD)to achieve high-speed optical/electrical conversion of 70 nW~7μW low-light signals,suppresses out-of-band noise through a 5th order Chebyshev differential bandpass filter,and uses automatic gain control(AGC)circuit to dynamically compensate for different optical power signals.The test results show that the board improves the signal-to-noise ratio by about 25.78 dB,achieves an electronic subdivision higher than 2048 in the speed range of 0.1~20 mm/s,and achieves a displacement measurement resolution of sub-nanometers,which significantly improves the measurement accuracy and dynamic response ability of the system.
作者
杜浩
薛兵
王剑
张文涛
高慧莹
DU Hao;XUE Bing;WANG Jian;ZHANG Wentao;GAO Huiying(School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin Guangxi 541004,China)
出处
《光通信技术》
北大核心
2025年第5期106-110,共5页
Optical Communication Technology
关键词
双频激光干涉
精密测量
光/电转换
信号处理
dual-frequency laser interference
precision measuring
optical/electrical conversion
signal processing
