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针对转动拉曼测温激光雷达数据采集系统中光子计数卡各通道阈值及延时之间的误差,结合光子计数卡的工作原理以及方波信号幅值电压的波动性,构建阈值测量系统,以方波信号作为通道的输入,通过调整阈值电压设定值,使计数值达到最大的方法对通道的阈值误差进行了测量,并对其进行了曲线拟合。构建延时测量系统,测量各通道之间的延时差,并提出了对其进行补偿的方案。对阈值误差测量数据及拟合结果进行了分析,分析结果表明通过拟合曲线对各通道阈值电压进行设定,可更快地设置所要求的阈值电压。对延时差的补偿可以使温度分布廓线定位精度提高约10m。
Aiming at the error between the threshold and delay of photon counting card in rotating Raman temperature measurement lidar data acquisition system, the threshold measurement system is constructed based on the working principle of photon counting card and the fluctuation of amplitude and voltage of the square wave signal The square wave signal is taken as the input of the channel. The threshold error of the channel is measured and the curve fitting is performed by adjusting the threshold voltage setting to maximize the count value. A time delay measurement system is constructed to measure the delay difference between channels and a scheme of compensating the delay is proposed. The threshold error measurement data and the fitting results are analyzed. The results show that the required threshold voltage can be set more quickly by fitting the curve to the threshold voltage of each channel. The compensation for the delay difference can improve the positioning accuracy of the temperature distribution profile by about 10m.