4-stage module
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Optoelectronics :
1. High-rat e seed sensor for planters:
to be inst alled on a standard planter seed tube
impro ved accuracy of detection of small seeds and high-rate soybeans
improved immunity to ambient light
power supply voltage range from 7 to 16 V
current consumption is less than 40 mA
open collector output
2. Silicon photodiode with daylight filter:
sensitive to infrared light from 700 to 1000 nm
sensitivity at 850 nm is higher than 0.5 A/W
photosensitive area is 15*0.5 sq. mm
maximum power supply voltage is 7 V
dark current is less than 100 nA @ 5 V and 20 C
3. Silicon photodiode array with daylight filter:
sensitive to infrared light from 700 to 1000 nm
sensitivity at 850 nm is higher than 0.5 A/W
4 photodiodes with sensitive area 3.75*0.5 sq. mm each
maximum power supply voltage is 7 V
dark current is less than 10 nA @ 5 V and 20 C
4. Reflective transducer with daylight filter:
six LED array to illuminate objects in front of window
LED maximum current is 30 mA
silicon photodiode to detect the reflected light
photodiode sensitive to infrared light from 700 to 1000 nm
photodiode sensitivity at 850 nm is higher than 0.5 A/W
photodiode sensitive area is 15*0.5 sq. mm
photodiode maximum power supply voltage is 7 V
photodiode dark current is less than 100 nA @ 5 V and 20 C
5. Reflective sensor:
an infrared LED to illuminate objects in front of the sensor
LED maximum current is 10 mA
silicon phototransistor to detect the reflected light
signal conditioning and communication circuitry
two-wire interface to external processing module
signal pulse amplitude on the power supply line is 2 mA |
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Last updated: Wed, 13 July 2016 |