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Title:   Author  item
                                            LIU, HUI - The Ohio State Universityitem
                                            Zhu, Hepingitem
                                            SHEN, YUE - The Ohio State Universityitem
                                            CHEN, YU - The Ohio State Universityitem
                                            OZKAN, ERDAL - The Ohio State University
  Submitted to: Symposium Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 8/10/2013
                                    Publication  Date: 8/20/2013
                                    Citation: Liu, H., Zhu, H., Shen, Y., Chen, Y., Ozkan, E. 2013. Evaluation of a laser scanning sensor for variable-rate tree sprayer development. In: Proceedings of the American Society of Agricultural and Biological Engineers Annual Meeting, July 21-24, 2013, Kansas City, Missouri. ASABE Paper No. 131594563. http://dx.doi.org/10.13031/aim.20131594563.Interpretive Summary:
                                Technical Abstract: Accurate canopy measurement capabilities are prerequisites to automate variable-rate sprayers. A 270° radial range laser scanning sensor was tested for its scanning accuracy to detect tree canopy profiles. Signals from the laser sensor and a ground speed sensor were processed with an embedded computer along with a touch screen mounted on a tractor. An algorithm for data acquisition and 3-dimentioal (3-D) canopy image reconstruction were designed with C++ language and MATLAB software. The system accuracy was tested under indoor laboratory conditions with four regular-shape objects and two artificial trees and outdoor conditions with three field trees.  Statistical analyses demonstrated the sensor measurements of the objects were not significantly different from those of the actual measurements. The mean RMS errors were not significant for scanning distance of 2 to 5 m and sensor travel speeds of 3.2 to 8.0 km h-1. Both indoor and outdoor tests verified that the wide-range laser sensor had the capability to accurately measure different sizes and shapes of objects. This confirmation offers the potential for the sensor to be integrated into spraying systems and provide variable-rate functions for tree crop applications.


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