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