大面积水域浓度场测试方法及系统研究

针对大面积水域浓度场难以实现实时测量、测量精度不高等问题,采用了一种多通道荧光测试系统和方法。首先,基于单色光诱导荧光检测浓度(LIF)原理,使用探头获取离散点的浓度参数。然后,经总线或通信网络技术,将数百个测点连接起来。最后,通过数据总线或网络将采集的数据输送到中央测控计算机中,处理离散的数据后形成完整的浓度场。在恒定流浓度场中的试验结果表明,污染物测量相对误差均值不超过5%,单次测量相对误差最高值为8.33%,传感器线性度不超过5%,可检测的荧光素钠溶液浓度分辨率为0.001 ppm,系统测量稳定、精度较高。相较于其他浓度测量方法,该系统具有测量面积大、实时测量的优势,可为水污染防治等领域提供可靠的技术支撑。

Study on measurement method for concentration field of large water area and its system

Aiming at the problem that is difficult to realize the real time measurement of concentration field of large ware area，while the accuracy of the measurement is lower as well，a multichannel fluorescence testing system and its method are adopted. Firstly，the concentration parameters of the discrete points are obtained with the probe on the basis of the principle of light induced fluorescence detection of concentration （LIF）. Afterward，hundreds of measuring points are connected through bus or communication network technology. Finally，the acquisited data are transported to the central measurement and control computer through the data bus or network，and then an integrated concentration field is formed after processing the discrete data. The result from the test made in the concentration field of steady flow shows that the average relative error of pollutant measurement is not over 5%，the maximum relative error of a single measurement is 8.33%，the sensor linearity error is not over 5% and the detectable concentration resolution of fluorescein sodium solution is 0.001 ppm，thus the measurement made by this system is stable with a higher accuracy. Compared with the other concentration measurement methods，this system has the advantages of large measuring area and real time measurement，and then can provide a reliable support for those fields of prevention and control of water pollution，etc.