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Home arrow Swath Kit arrow Using Swath Kit
Using the Swath Kit

Step 3. Reading the Sprayed Cards

To obtain data about the spray pattern, the sprayed cards are held in front of a portable image analyzer. The images of the droplet stains appear on the screen of the laptop. The user captures the details of each spray card. Typically it takes about 10 seconds to read each card.

The Swath Kit can be adapted to read different sized droplets. For insecticide sprays areas of approximately 1cm² are sampled. For herbicides areas up to 25 cm² are typically read.


Step 4. Data Analysis


Single Swath Pattern

A single pattern (with volume per unit area as the source of data). Instead of looking at volume/area, droplets/unit area (e.g. gallons/acre, ml/cm²) or active ingredient (e.g. g/ha) can be displayed.


If coverage is important (such as with some herbicides) the percentage of the card that was covered can used on the y-axis.



Simulated Overlap 

The same pattern as in Figure 1 (displayed as oz/acre) is seen overlapped as a racetrack pattern (same direction of flight). The overlap can be adjusted with the arrows, and the pattern changes immediately. The mean deposit and the coefficient of variation (a statistical way of measuring evenness) is instantly calculated to show the user whether a wide lane separation affects the quality of the application.


Swath Data - 4 Parameters

Here the swath pattern is shown in 4 graphs diplaying the different parameters - the calculated volume per unit area, the droplet density (drops per unit area), the proportion of the spray card covered and the distribution of the Volume Median Diameter (vmd) across the swath pattern.

All data and figures can be printed for a final report of a spray trial.


Swath Evenness

The same pattern as above showing how the evenness of the pattern - measured by the coefficient of variation, and mean application rate change with increasing lane separation.

It can be seen that the C of V is below 30% up to around 60ft, and then increases. In theory at least, this aircraft set-up cpuld be used to spray swaths of up to 60 ft, but beyond that, there would be unacceptably uneven application.



Using the Swath Kit for aircraft spray pattern analysis can benefit both operators and the users of their services. Both parties will obtain information about the effective lane separation (aka swath interval) of the aircraft, the evenness of the pattern as well as a general idea of the droplet spectrum produced by the aircraft's spray system. Any corrections can be made before operations start, avoiding potentially expensive errors.

For further information download the Swath Kit User's Manual here .