[19p-438-1~19] 3.8 Optical measurement, instrumentation, and sensor

[19p-438-5] Stand-off measurement of vegetation fluorescence on the canopy level under insolation

〇Kenji Kuriyama¹, Naohiro Manago², Yu Tanaka³, Tatsuhiko Shiraiwa³, Hiroaki Kuze² (1.Shizuoka Univ., 2.Chiba Univ., 3.Kyoto Univ.)

Keywords:solar induced fluorescence, Ground-based remote sensing, vegetation canopy

A stand-off system has been developed for observing solar-induced vegetation fluorescence on the canopy level. The system collects optical signals using a telescope, leading to the spectral measurement using a CCD spectrometer, as well as the two-dimensional measurement of the fluorescence intensity distribution by means of a cooled CCD camera. The spectrum of whiteboard taken simultaneously with that of vegetation canopy is used as a reference to extract the fluorescence intensity. We describe the application of this system to the rice and soybean fields recently performed in Kyoto. It is found that the present approach based on spectral shapes is useful for eliminating the large effect of vegetation reflection in the near-infrared part of the spectrum and extracting weak fluorescence signals even under daylight conditions.