论文部分内容阅读
在光纤布拉格光栅传感系统中,法布里-珀罗(F-P)滤波器是实现波长解调的关键器件。针对模拟控制电路产生锯齿波进行滤波器驱动的速度和频率分辨率不够高的缺点,利用Altera公司的可编程片上系统(SOPC)技术,设计了一个基于FPGA和高速数模转换芯片DAC904的控制电路,并通过后级调理电路处理得到了一个频率为100 Hz、幅值为0~18V的锯齿波电压信号完成对F-P滤波器的驱动控制。仿真结果表明:利用数字化技术产生锯齿波来控制滤波器的设计方法,可以简化电路设计,提高输出信号的频率分辨率,提高系统运行速度。
In fiber Bragg grating sensing system, Fabry-Perot (F-P) filter is the key device to achieve wavelength demodulation. Aiming at the drawback that the speed and frequency resolution of the sawtooth wave generated by the analog control circuit are not high enough, a control circuit based on FPGA and high speed digital-to-analog converter DAC904 is designed by using Altera’s Programmable System-on-Chip (SOPC) , And through a post-conditioning circuit to obtain a frequency of 100 Hz, amplitude of 0 ~ 18V sawtooth voltage signal to complete the drive control FP filter. The simulation results show that using digital technology to generate sawtooth wave to control the design of the filter can simplify the circuit design, improve the frequency resolution of the output signal and improve the system running speed.