基于FPGA的等离子体中laser诱导荧光的解调
FPGA based demodulation of laser induced fluorescence in plasmas
摘要：
我们提出了一个现场可编程门阵列（FPGA）为基础的系统，计数光子从激光诱导荧光（LIF）在实验室等离子体。这是通过基于FPGA的上/下计数器来实现的，该计数器解调数据，给出背景减去的LIF信号流，该信号流在每个激光幅度调制周期完成时用新点更新。我们演示了使用FPGA来调制1 MHz的激光并解调产生的LIF数据流。该数据流用于计算在等离子体离子波动谱的1 MHz处采样的基于LIF的测量。
英文摘要：
We present a field programmable gate array (FPGA)-based system that counts photons from laser-induced fluorescence (LIF) on a laboratory plasma. This is accomplished with FPGA-based up/down counters that demodulate the data, giving a background-subtracted LIF signal stream that is updated with a new point as each laser amplitude modulation cycle completes. We demonstrate using the FPGA to modulate a laser at 1 MHz and demodulate the resulting LIF data stream. This data stream is used to calculate an LIF-based measurement sampled at 1 MHz of a plasma ion fluctuation spectrum.
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