Residue detection system

A method of determining a concentration of chemical residue present within a mobile agricultural sprayer, the method comprising:

• receiving a first sensor signal indicative of a detected characteristic of a rinse fluid present within a rinse tank of the mobile agricultural sprayer;
• performing a rinsing operation that pumps the rinse fluid from the rinse tank along a fluidic pathway carried by a boom through a spray nozzle coupled to the fluidic pathway and disposed along the boom, to rinse the fluidic pathway of residue of a chemical from a completed spraying operation that sprayed the chemical at a worksite;
• receiving a second sensor signal indicative of a detected characteristic of fluid in the fluidic pathway from the rinsing operation;
• and
• determining, based on the first and second sensor signals, a concentration of residue of the chemical in the fluid present within the fluidic pathway from the completed spraying operation.

A mobile agricultural sprayer comprising:

• a chemical tank configured to hold a chemical to be sprayed on a field during a spraying operation;
• a rinse tank configured to hold a rinse fluid that is different from the chemical in the chemical tank;
• a pump configured to pump the rinse fluid from the rinse tank along a fluidic pathway through one or more nozzles of the mobile agricultural sprayer to perform a rinsing operation that rinses the fluidic pathway of residue of the chemical from the spraying operation, wherein the fluidic pathway is carried by a boom of the mobile agricultural sprayer;
• a first sensor coupled to the rinse tank and configured to measure a characteristic of the rinse fluid within the rinse tank and generate a first sensor signal indicative of the characteristic;
• a second sensor coupled to the fluidic pathway carried by the boom and configured to measure a characteristic of fluid in the fluidic pathway carried by the boom from the rinsing operation and generate a second sensor signal indicative of the characteristic;
• and
• a residue detection system configured to receive the first and the second sensor signals, and, based on the received signals, determine a chemical residue concentration within the fluidic pathway.