Water content observation device, water content observation method, cultivation device and sample

摘要

A main leaf and a plurality of artificial leaves are attached to the white background plate. The first light source irradiates the reference light of 905 nm while sequentially scanning toward the white background plate. The second light source irradiates the measurement light of 1550 nm while sequentially scanning toward the white background plate. The threshold value setting / moisture index detection processing unit calculates the relative moisture content of the main leaf based on the light intensity of each of the reflected light of the reference light and the measurement light reflected by the main leaf and the plurality of leaves. The control unit displays a time-series transition of the relative moisture content calculated in the measurement period on the monitor.