土体吸力测量对岩土工程稳定性评估至关重要，实时准确量测土体从饱和状态到干燥状态的吸力变化一直是非饱和土力学领域的研究热点和难点。露点水势技术是一种新型土体吸力测量方法。详细介绍了PSYPRO露点水势仪的工作原理以及所需要调试参数的意义，并结合标定试验和蒸发试验给出了PSYPRO露点水势仪测量土体不同吸力区间的最优参数设置推荐。先利用不同浓度NaCl溶液对PST-55湿度计进行标定试验并得到了校正系数，随后开展室内土体蒸发试验，并使用PST-55湿度计和ML3土体含水率传感器分别测量干燥过程中土体吸力和含水率变化，验证了露点水势技术用于土体吸力实时连续监测的可行性和准确。

Soil suction measurement is crucial for the stability assessment of geotechnical engineering, real-time and accurate measurement of suction changes in soil from saturated to dry state has always been a hot topic and challenge in the field of unsaturated soil mechanics. Dew point water potential technique is a novel measurement method of soil suction. This paper detailly introduces the working principle of the PSYPRO dew point water potential meter and the significance of the required debugging parameters, and combines the calibration test and the evaporation test to give the optimal time parameter setting recommendations for the PSYPRO dew point water potential meter to measure different soil suction intervals. In this paper, the PST-55 psychrometer was firstly calibrated with different concentrations of NaCl solutions and the correction coefficient was obtained, and then the laboratory soil evaporation test was carried out, the PST-55 psychrometer and ML3 soil moisture sensor were used to measure the drying process. The changes in soil suction and water content verified the feasibility and accuracy of dew point water potential technique for real-time continuous monitoring of soil suction.