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Related Experiment Video

Updated: Mar 14, 2026

$Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction$

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

Published on: September 16, 2016

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction.

Bradley K Fritz¹, W Clint Hoffmann²

¹Aerial Application Technology Research Unit, USDA ARS; bradfritz@me.com.

Journal of Visualized Experiments : Jove

|September 30, 2016

Summary

Accurate spray droplet size measurement is crucial for effective crop protection. This study details precise laser diffraction methods for evaluating agrochemical spray nozzles, ensuring reliable application performance.

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$Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction$

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Area of Science:

Agricultural Engineering
Physical Chemistry
Environmental Science

Background:

Effective crop protection relies on precise application of herbicides and pesticides.
Spray droplet size significantly impacts product efficacy and environmental behavior.
Laser diffraction is a common laboratory method for measuring spray droplet size.

Purpose of the Study:

To describe precise methods for measuring spray droplet size using laser diffraction for ground and aerial applications.
To ensure inter- and intra-laboratory precision and minimize sampling bias in droplet size measurements.
To provide a framework for evaluating agrochemical spray application nozzles.

Main Methods:

Utilized laser diffraction equipment in laboratory wind tunnels for droplet size analysis.
Emphasized maintaining critical measurement distances and concurrent airflow during testing.
Incorporated real-time data quality analysis to prevent data variation and errors.

Main Results:

Developed and validated methods for precise spray droplet size measurement.
Demonstrated the importance of controlled environmental conditions (distance, airflow) for accuracy.
Identified limitations related to atypical spray conditions and nozzle performance.

Conclusions:

The described laser diffraction methods ensure precision and minimize bias in spray droplet size evaluation.
Accurate droplet size data is essential for optimizing agrochemical application and performance.
These methods offer an efficient approach for assessing spray nozzle performance across various settings.