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Exact laser beam positioning for measurement of vegetation vitality

Lars Lindner (Department of Optoelectronic and Automated Measurement, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Oleg Sergiyenko (Department of Optoelectronic and Automated Measurement, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Moises Rivas-López (Department of Optoelectronic and Automated Measurement, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Daniel Hernández-Balbuena (Facultad de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Wendy Flores-Fuentes (Facultad de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Julio C. Rodríguez-Quiñonez (Facultad de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Fabian N. Murrieta-Rico (Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, México)
Mykhailo Ivanov (Department of Optoelectronic and Automated Measurement, Instituto de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Vera Tyrsa (Facultad de Ingeniería, Universidad Autónoma de Baja California, Mexicali, México)
Luis C. Básaca-Preciado (Centro de Enseñanza Técnica y Superior, Mexicali, México)

Industrial Robot

ISSN: 0143-991x

Article publication date: 19 June 2017

Abstract

Purpose

The purpose of this paper is to present a novel application for a newly developed Technical Vision System (TVS), which uses a laser scanner and dynamic triangulation, to determine the vitality of agriculture vegetation. This vision system, installed on an unmanned aerial vehicle, shall measure the reflected laser energy and thereby determine the normalized differenced vegetation index.

Design/methodology/approach

The newly developed TVS shall be installed on the front part of the unmanned aerial vehicle, to perform line-by-line scan in the vision system field-of-view. The TVS uses high-quality DC motors, instead of previously researched low-quality DC motors, to eliminate the existence of two mutually exclusive conditions, for exact positioning of a DC motor shaft. The use of high-quality DC motors reduces the positioning error after control.

Findings

Present paper emphasizes the exact laser beam positioning in the field-of-view of a TVS. By use of high-quality instead of low-quality DC motors, a significant reduced positioning time was achieved, maintaining the relative angular position error less than 1 per cent. Best results were achieved, by realizing a quasi-continuous control, using a high pulse-width modulated duty cycle resolution and a high execution frequency of the positioning algorithm.

Originality/value

The originality of present paper is represented by the novel application of the newly developed TVS in the field of agriculture. The vitality of vegetation shall be determined by measuring the reflected laser energy of a scanned agriculture zone. The paper’s main focus is on the exact laser beam positioning within the TVS field-of-view, using high-quality DC motors in closed-loop position control configuration.

Keywords

Citation

Lindner, L., Sergiyenko, O., Rivas-López, M., Hernández-Balbuena, D., Flores-Fuentes, W., Rodríguez-Quiñonez, J.C., Murrieta-Rico, F.N., Ivanov, M., Tyrsa, V. and Básaca-Preciado, L.C. (2017), "Exact laser beam positioning for measurement of vegetation vitality", Industrial Robot, Vol. 44 No. 4, pp. 532-541. https://doi.org/10.1108/IR-11-2016-0297

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited