Sensor and method of detecting the condition of a turf grass
First Claim
1. A. device for detecting a condition of turf grass, said device comprising:
- an array of LEDs generating a pattern of illuminating light;
at least one photodetector receiving a pattern of reflected light which is coincident with said pattern of illuminating light;
one or more photodetectors that detect stray light from said array of LEDs;
a feedback loop controlling said array of LEDs based upon stray light from said array of LEDs;
wherein said feedback loop comprises more than one demodulator for more than one frequency;
a circuit for providing offset correction, said circuit comprising a first offset correction circuit for a first frequency and a second offset correction circuit for a second frequency; and
a background light subtraction circuit.
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Abstract
A method of detecting the condition of a turf grass is described. According to one aspect of the invention, the method comprises steps of attaching an active sensor to a mower; traversing a section of turf grass; and processing the output of the sensor. A device for detecting the condition of turf grass is also disclosed. The device comprises an array of illuminating devices generating a pattern of illuminating light; a detecting device receiving a pattern of reflected light which is coincident with the pattern of illuminating light; a detecting device adapted to detect stray light from the array of illuminating devices; and a feedback loop controlling the array of illuminating devices. A system employing the device is also disclosed.
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Citations
1 Claim
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1. A. device for detecting a condition of turf grass, said device comprising:
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an array of LEDs generating a pattern of illuminating light; at least one photodetector receiving a pattern of reflected light which is coincident with said pattern of illuminating light; one or more photodetectors that detect stray light from said array of LEDs; a feedback loop controlling said array of LEDs based upon stray light from said array of LEDs;
wherein said feedback loop comprises more than one demodulator for more than one frequency;a circuit for providing offset correction, said circuit comprising a first offset correction circuit for a first frequency and a second offset correction circuit for a second frequency; and a background light subtraction circuit.
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Specification