Spray pattern monitoring

A spray sensor for monitoring a liquid spray emitted by a spray nozzle, the spray sensor comprising:

• a plurality of optical sensors configured to emit and receive directional light;
• and
• a sensor controller operably connected to the plurality of optical sensors, the sensor controller comprising:
• control circuitry;
• and
• a memory encoded with instructions that, when executed by the control circuitry, cause:
• a first optical sensor of the plurality of optical sensors to emit a first output of directional light substantially orthogonal to the liquid spray;
• a second optical sensor of the plurality of optical sensors to emit a second output of directional light substantially orthogonal to the liquid spray;
• and
• the sensor controller to determine, based on a comparison of a first return of the first output of directional light reflected by the liquid spray and received by the first optical sensor and a second return of the second output of directional light reflected by the liquid spray and received by the second optical sensor, a liquid spray status of the liquid spray emitted by the spray nozzle;
• wherein the liquid spray status comprises:
• an absent liquid spray status when at least one of the first optical sensor and the second optical sensor does not receive a respective return of the directional light;
• and
• a present liquid spray status when each of the first optical sensor and the second optical sensor receives the respective returns of the directional light.