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在农业、气象和土壤物理研究中,由水汽沉降形成的露水已受到重视,对影响土壤和植物表面凝聚和蒸发过程的参数更引人注目。这些过程主要取决于供试表面的温度和吸收特性,以及邻近空气层的温度、相对湿度和运动。因此露水收集表面的材料及其放置方式对测定结果有很大影响。关于露水收集器和测定方法有大量文献报道。但由于探头的收集表面装在高出地面几厘米处,测量系统本身与自然条件不同,所测数值或多或少偏离实际露量。β吸收露量仪的改进有以下三个方面;(1)收集探头用当地土壤或与之相当的陶瓷制作;(2)使探头与土表地热接触;(3)应用β吸收原理。
In agricultural, meteorological and soil physics studies, dew formed by water vapor deposition has received much attention, and has drawn more and more attention on the parameters affecting soil and plant surface condensation and evaporation processes. These processes depend mainly on the temperature and absorption characteristics of the test surface, as well as the temperature, relative humidity and movement of the adjacent air layers. Therefore, the material of the dew collecting surface and the way it is placed have a great influence on the measurement result. A great deal of literature has been reported on dew collectors and methods of determination. However, since the collection surface of the probe is mounted a few centimeters above the ground, the measurement system itself differs from the natural conditions in that the measured values deviate more or less from the actual dewfall. β absorbance instrument to improve the following three aspects; (1) collection probe with the local soil or its equivalent to the production of ceramics; (2) the probe and earth surface geothermal contact; (3) the application of β absorption principle.