Table 1.
The principles, advantages and shortcomings of the sensing methods.
Fig 1.
Schematic diagram of missing a seed during seed metering.
Fig 2.
Structure diagram of the diode positioning ring.
Fig 3.
Relative intensity distribution of the diode.
Fig 4.
Schematic diagram of seeds passing through the detection area.
Fig 5.
Circuit schematic diagram of the performance monitoring system for the seed metering device.
Fig 6.
Picture of the monitoring system.
Fig 7.
Structure of the LED photoelectric sensing system.
Fig 8.
Schematic diagram of the seed dropping pulse.
Fig 9.
Flow chart of the program based on the PRM.
Fig 10.
Flow chart of the program based on the PCM.
Fig 11.
Bench test device.
Fig 12.
Pulse width distribution for the Ekangmian-10 cotton seeds.
Fig 13.
Pulse width distribution for the Zhengdan-958 corn seeds.
Table 2.
Results of seeding quantity monitoring.
Table 3.
Seed metering performance monitoring results.