Low-Error Soil Moisture Sensor Employing Spatial Frequency Domain Transmissometry. - Tadaomi Saito; Takahiro Oishi; Mitsuhiro Inoue; Sachio Iida; Norihito Mihota; Atsushi Yamada; Kohei Shimizu; Satoru Inumochi; Koji Inosako (Sensors, 2022)