Technical Note: Spray Pattern Investigation of an Axial-Fan Airblast Precision Sprayer Using a Modified Vertical Patternator

Khot, Lav R.; Ehsani, Reza; Albrigo, Gene; Landers, Andrew; Larbi, Peter Ako

doi:10.13031/2013.42426

Cited by 15 publications

(5 citation statements)

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“…Khot et al [89] retrofitted an axial-fan air-blast sprayer with adjustable air-diverting louvres (Figure 8). Variable air supply was achieved by moving the air-diverting louvre plate to adjust the air outlet area.…”

Section: Control Methods Adjusting Direction Air Velocity Change Air ...mentioning

confidence: 99%

“…Air direction, air velocity, and air volume were three factors in variable air supply. At present, there are four methods for controlling the air supply (Table 3): adjusting the fan speed [87,88], adjusting the air inlet area, adjusting the air outlet area [89,90], and adjusting the distance between the air outlet and the canopy [91].…”

Section: Variable Air Supply Control Unitmentioning

confidence: 99%

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Key Technologies for an Orchard Variable-Rate Sprayer: Current Status and Future Prospects

et al. 2022

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An orchard variable-rate sprayer applies the appropriate amount of plant protection products only where they are needed based on detection data from advanced sensors, a system that has attracted increasing attention. The latest developments in the detection unit, variable control unit, and signal-processing algorithm of the variable-rate sprayer are discussed. The detection of target position and volume is realized with an ultrasonic sensor, a laser scanning sensor, or other methods. The technology of real-time acquisition of foliage density, plant diseases and pests and their severity, as well as meteorological parameters needs further improvements. Among the three variable-flow-rate control units, pulse width modulation was the most widely used, followed by pressure-based, and variable concentration, which is preliminarily verified in the laboratory. The variable air supply control unit is tested both in the laboratory and in field experiments. The tree-row-volume model, the leaf-wall-area model, and the continuous application mode are widely used algorithms. Advanced research on a variable-rate sprayer is analyzed and future prospects are pointed out. A laser-based variable-rate intelligent sprayer equipped with pulse width modulation solenoid valves to tune spray outputs in real time based on target structures may have the potential to be successfully adopted by growers on a large scale in the foreseeable future. It will be a future research direction to develop an intelligent multi-sensor-fusion variable-rate sprayer based on target crop characteristics, plant diseases and pests and their severity, as well as meteorological conditions while achieving multi-variable control.

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Section: Control Methods Adjusting Direction Air Velocity Change Air ...mentioning

confidence: 99%

Section: Variable Air Supply Control Unitmentioning

confidence: 99%

Key Technologies for an Orchard Variable-Rate Sprayer: Current Status and Future Prospects

et al. 2022

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“…It is provided with laser scanning sensors to detect fruit tree canopies in real-time, control three hydraulic spray booms to drive the air outlet for motions based on the detection information, and finally achieve the quick determination of the best position of air outlet to the canopy. Khot et al [83] added a baffle at the air outlet of orchard sprayers to change the area of the air outlet, thus adjusting the force of air flow.…”

Section: Structural Optimizationmentioning

confidence: 99%

Research Status, Methods and Prospects of Air-Assisted Spray Technology

Wei

Xue

et al. 2023

Agronomy

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Air-assisted boom sprayer is proven to be one of the best pesticide application methods to achieve uniform deposition of droplets in the canopy and improve the effective utilization of pesticides. However, the air flow velocity, air flow volume and air flow direction of the orchard sprayer should match the characteristic parameters of the target canopy, equipment spraying parameters and meteorological conditions so as to improve the spraying quality and reduce environmental pollution. This paper elaborates on the research status of air-assisted field sprayers and orchard sprayers, summarizes the research methods of air-assisted sprayers in four aspects, including experimental verification, theoretical analysis, simulation and structural optimization, and clarifies the advantages and disadvantages of these methods. It also presents two future research and development trends, including the intelligent, precise dynamic regulation of air flow velocity, air flow volume and air flow direction and the instant feedback of spraying quality, hoping to provide a reference for the research of air-assisted spray technology and equipment.

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“…Researchers discovered that pesticides were detected in of agricultural streams, of wells and of deep aquifers sampled across the U.S. 3 . Studies 4 – 6 , related this chemical runoff problem to the pattern of spray emitted from nozzles. Agricultural nozzles’ effectiveness is determined by many different factors, among which the most important are droplet size and velocity and spray pattern .…”

Section: Introductionmentioning

confidence: 99%

A deep-learning framework for spray pattern segmentation and estimation in agricultural spraying systems

Acharya

Burgers

Nguyen

2023

Sci Rep

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This work focuses on leveraging deep learning for agricultural applications, especially for spray pattern segmentation and spray cone angle estimation. These two characteristics are important to understanding the sprayer system such as nozzles used in agriculture. The core of this work includes three deep-learning convolution-based models. These models are trained and their performances are compared. After the best model is selected based on its performance, it is used for spray region segmentation and spray cone angle estimation. The output from the selected model provides a binary image representing the spray region. This binary image is further processed using image processing to estimate the spray cone angle. The validation process is designed to compare results obtained from this work with manual measurements.

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Technical Note: Spray Pattern Investigation of an Axial-Fan Airblast Precision Sprayer Using a Modified Vertical Patternator

Cited by 15 publications

References 0 publications

Key Technologies for an Orchard Variable-Rate Sprayer: Current Status and Future Prospects

Key Technologies for an Orchard Variable-Rate Sprayer: Current Status and Future Prospects

Research Status, Methods and Prospects of Air-Assisted Spray Technology

A deep-learning framework for spray pattern segmentation and estimation in agricultural spraying systems

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