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为了给分布式拉曼测温系统中的激光器提供激励源,设计一个稳定性好、纳秒级脉宽、周期可控、占空比可调的高速脉冲发生器。以Altera公司的CycloneⅡ系列的EP2C5Q208C8为核心的核心板和一些外围器件组成硬件电路。高速脉冲发生器是在QuartusⅡ软件平台下,使用VHDL在FPGA上用硬件逻辑电路设计。脉冲发生器控制系统是利用QuartusⅡ开发软件和其中集成的SoPC Builder系统开发工具进行设计。实验结果表明,该脉冲发生器稳定输出脉宽为10～500 ns,周期为1μs～1 ms,占空比可调的窄脉冲,满足分布式拉曼测温系统的要求。
In order to provide the excitation source for the laser in the distributed Raman temperature measurement system, a high speed pulse generator with good stability, nanosecond pulse width, controllable period and adjustable duty cycle is designed. To Altera’s Cyclone Ⅱ series of EP2C5Q208C8 as the core of the core board and some peripheral devices to form a hardware circuit. High-speed pulse generator is in the Quartus Ⅱ software platform, the use of VHDL FPGA hardware design of the logic circuit. Pulse generator control system is the use of Quartus Ⅱ development software and integrated SoPC Builder system development tools for design. The experimental results show that the pulse generator has a stable pulse width of 10 ~ 500 ns, a period of 1 μs ~ 1 ms and a narrow pulse with adjustable duty ratio, which meets the requirements of distributed Raman temperature measurement system.