BIOLOGICAL, MICROCLIMATE, AND TRANSPORT PROCESSES AFFECTING PEST CONTROL APPLICATION TECHNOLOGY
Location: Application Technology Research Unit
Title: Laboratory and Field Tests of Ultrasonic Sensors for Precision Sprayers
Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: February 20, 2010
Publication Date: June 23, 2010
Citation: Jeon, H.Y., Zhu, H., Derksen, R.C., Ozkan, H.E., Krause, C.R. 2010. Laboratory and Field Tests of Ultrasonic Sensors for Precision Sprayers. American Society of Agricultural and Biological Engineers International Meeting, June 20-23, 2010, Pittsburgh, Pennsylvania. ASABE Paper # 1008804.
Reliable function of sensors under rough field conditions is required for the development of variable-rate sprayers to deliver pest control agents to tree liners in ornamental nurseries. Two ultrasonic sensors were examined to identify how their durability and detection stability would be influenced by the changes in temperature, wind, dust, travel speed and spray cloud. One of the sensors did not perform satisfactorily under these conditions. The other had a 0.1% variation in root mean square error (RMSE) of the detecting distance before and after exposing to cold weather conditions. Mean RMSE was 8 % under dusty conditions, 1.5–1.8 % under windy conditions, and 12.3 % to 23 % for the travel speed ranging from 0.8 to 3.0 m/s. It also showed that increasing ambient temperature from 16.7 to 41.6 °C reduced the detection distance by 4.0 %. Detecting through spray cloud caused the RMSE to vary from 1.2 to 61.4 %, the largest measurement error among the six variables tested. To reduce the RMSE, optimal configurations between the sensor and spray nozzles were identified. In addition, synchronized multiple-sensor strategies were examined for improving the measurement stability and accuracy of the sensor while detecting targets.