Stability and Availability of Real-time Soil Spectrophotometer

  • KAHO Toshikazu
    The Japanese Society of Agricultural Machinery Faculty of Agriculture, Tokyo University of Agriculture and Technology Present address: Faculty of Education and Human Sciences, Niigata University
  • SHIBUSAWA Sakae
    The Japanese Society of Agricultural Machinery Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • MORIMOTO Eiji
    The Japanese Society of Agricultural Machinery Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • HIRAKO Shin-ichi
    OMRON Healthcare Co., Ltd.
  • OHTOMO Astushi
    Applied Electronics Research Center, Kumamoto Technology and Industry

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Other Title
  • リアルタイム土壌スペクトル計測の精度評価
  • リアルタイム ドジョウ スペクトル ケイソク ノ セイド ヒョウカ

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Abstract

The stability and availability of soil reflectance records were evaluated using a modified real-time soil spectrophotometer. The results clarified that the reflectance was usable in the wavelength range of 550-1650nm. Using the 857 bits of scanning data obtained from the field experiment, the mean of distances between the soil and the sensor probes was estimated to be about 86mm with 3.3mm standard deviation. Simulations of illumination and reflection indicated that a distance of 55-90mm can provide a stable condition to get correct soil reflectance, and that a variation of the distance can affect the apparent soil absorption of light energy. Correct estimation of soil parameters requires distinctive calibration models for the soil spectrophotometer.

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