The study of the micro-physical characteristics of spray droplets provides crucial insights into the impact of sprinkler water on soil erosion, leaf impact, and the microclimate of agricultural environments. However, the variability in measurement outcomes across different technologies due to their distinct measurement principles is a significant challenge. This research aims to evaluate and compare the droplet diameter, velocity, application rate, and kinetic energy rate using four distinct measurement technologies: the paper stain method (PS), flour pellet method (FP), laser precipitation monitor (LPM), and two-dimensional video disdrometer (2DVD), alongside a rain gauge (RG) in the context of sprinkler irrigation conditions. The results reveal that: (1) The FP method struggled to capture small droplets under the same spray conditions, while the PS method recorded a maximum droplet diameter exceeding 7 mm. The LPM registered the highest droplet count per unit area and time, notably capturing a significant number of small droplets (< 1 mm). Conversely, the 2DVD provided a more uniform distribution of droplet sizes, with the LPM’s mean equivalent droplet diameter (d_v) being 0.86 times that of the 2DVD. (2) Although droplet diameters and velocities measured by the 2DVD, LPM, FP, and PS, decreased with increased working pressure, these technologies concurred when assessing low-velocity and small-diameter droplet. (3) The 2DVD’s larger sampling area compared to other methods enables the acquisition of more representative droplet characteristics, including their irregular shapes, suggesting its utility in measuring the micro-physical properties of sprayed droplets. (4) Based on the kinetic energy rate measured by the 2DVD under identical conditions, kinetic energy rate calibration factors of 0.88, 1.15, and 1.10 are suggested for the LPM, FP, and PS, respectively. This study provides essential data for calibrating and applying various droplet measurement technologies.

喷雾液滴的微物理特征的研究为了解喷水对土壤侵蚀、树叶影响和农业环境小气候的影响提供了重要的见解。然而，由于不同技术的测量原理不同，测量结果存在差异，这是一个重大挑战。本研究旨在使用四种不同的测量技术来评估和比较液滴直径、速度、施用率和动能率：纸染色法 (PS)、面粉颗粒法 (FP)、激光沉淀监测仪 (LPM) 和两种不同的测量技术。在喷灌条件下，三维视频测速仪 (2DVD) 与雨量计 (RG) 并排。结果表明：（1）FP方法在相同喷雾条件下难以捕获小液滴，而PS方法记录的最大液滴直径超过7mm。 LPM 记录了每单位面积和时间的最高液滴计数，特别是捕获了大量的小液滴（< 1 毫米）。相反，2DVD 提供了更均匀的液滴尺寸分布，LPM 的平均等效液滴直径 ( d _v ) 是 2DVD 的 0.86 倍。 (2) 虽然 2DVD、LPM、FP 和 PS 测量的液滴直径和速度随着工作压力的增加而减小，但这些技术在评估低速和小直径液滴时一致。 (3) 与其他方法相比，2DVD 具有更大的采样面积，能够获取更具代表性的液滴特征，包括其不规则形状，表明其在测量喷雾液滴的微观物理特性方面具有实用性。 (4) 根据相同条件下2DVD测得的动能率，建议LPM、FP和PS的动能率校准因子分别为0.88、1.15和1.10。这项研究为校准和应用各种液滴测量技术提供了必要的数据。