A new apparatus for continuous measuring the falling velocity of the wind-dispersal seeds

Huihua Ji; Shoubing Wang; Huacai Chen; Zhouhong Zhu; Min Zhu

doi:10.1117/12.904261

30 November 2011 A new apparatus for continuous measuring the falling velocity of the wind-dispersal seeds

Huihua Ji, Shoubing Wang, Huacai Chen, Zhouhong Zhu, Min Zhu

Proceedings Volume 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 820113 (2011) https://doi.org/10.1117/12.904261
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

A new apparatus for continuous measuring the falling velocity of wind-dispersal seeds is presented in this paper. The key unit of this apparatus is the photo-detectors installed on the ends of a vertical tube. The photodetector is composed of a LED and a photo-sensor. The LED light goes through a horizontal slit to from a flat light plane, which be received by the photo-sensors on the opposite side. When a plant seed falls down and passes through the flat light plane, a pulse signal will be detected by the photo-sensor. The average falling velocity of the seed is calculated according to the falling time and the distance from the starting point to the testing point. By using several tubes and photo-detectors, the apparatus can continuously measure the velocity of a seed falling down to different height. This apparatus avoids the affect of the static electricity and airflow to the seeds.

Citation Download Citation

Huihua Ji, Shoubing Wang, Huacai Chen, Zhouhong Zhu, and Min Zhu "A new apparatus for continuous measuring the falling velocity of the wind-dispersal seeds", Proc. SPIE 8201, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 820113 (30 November 2011); https://doi.org/10.1117/12.904261

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KEYWORDS

Signal detection

Particle filters

Light emitting diodes

Computer programming

Signal processing

Velocity measurements

Ecology

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