Real-time processing system for cavity ring down signal based on ZYNQ chip

The traditional cavity ring-down signal processing system usually consists of a computer and a high-speed data acquisition card, and it has some problems such as large volume, high cost and inconvenience to carry in practical engineering applications. Aiming at the deficiency of traditional signal processing system, a compact real-time data acquisition and processing scheme is proposed and realized based on the Xilinx ZYNQ chip. In which, the FPGA and ARM core integrated into the ZYNQ chip are used to replace the data acquisition card and PC, and the whole system are built and implemented on the circuit board. The experimental results show that, compared with the traditional signal acquisition and processing system, the relative deviation of V-shaped cavity decay time between the two systems is 0.38c%, and the repeated measurement standard deviation of the new system is much smaller, which is about 1/3 of the traditional system. Furthermore, the ENOB (Effective Number of Bits) and SFDR (Spurious-Free Dynamic Range) of the new system are measured as > 10.4 bit and > 72 dB respectively.