| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
The estimation of particle size information was conducted using a single ultrasonic wave sensor. Reflective echo intensity data by samples made in glass beads, which is imitation sample of sand, was measured in the experiments. And frequency analysis was employed for the data to investigate the relationship between particle size and frequency characteristics. The experiment imitating the suspended sand using agar phantom indicated that the center frequency calculated from frequency spectral distribution of the echo data changed in accordance with the change of particle size of a sample. The experiment imitating sediment surface sand by increasing layer thickness demonstrated that the change of the maximum of frequency spectrum corresponded to that of the particle size. Experimental results suggested that it is possible to estimate sand particle information indispensable for estimation of sediment concentration by measurement using ultrasonic pulse wave.
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