#$%^&*AU2018204721B220191205.pdf#####YIELD MONITORING APPARATUS, SYSTEMS, AND METHODS ABSTRACT An apparatus for monitoring a mass flow rate of harvested grain in a combine having a clean grain elevator (40) including a clean grain elevator chain (42), the apparatus comprising: a sensor surface (522)； a sensor (500) disposed to measure displacement of said sensor surface (522)； a plurality of paddles (150) mounted to said clean grain elevator chain (42)； a cleaning apparatus driven by said clean grain elevator chain (42) and disposed to contact and remove material from said sensor surface (522)； and processing circuitry in data communication with said sensor (500), said processing circuitry configured to estimate a flow rate of grain based on a signal generated by said sensor (500), wherein said processing circuitry is further configured to distinguish a cleaning apparatus pulse from a plurality of paddle pulses, said cleaning apparatus pulse being generated when said cleaning apparatus contacts said sensor surface (522), said paddle pulses being generated when grain released by said plurality of paddles (150) contacts said sensor surface (522).
