Measurement of nitrate-nitrogen concentration in soil based on absorption spectroscopy
AssigneeMonsanto Technology LLC
InventorsMICHAEL JOHN PREINER, NICHOLAS CARLETON KOSHNICK, JUSTIN STEWART WHITE, JOHN PAUL STRACHAN
Life of this patent
Estimating the term…
Abstract
The nitrate-nitrogen concentration in soil is estimated based on the nitrate-nitrogen 200 nm absorption peak. In one embodiment, a device measures the attenuation spectrum of a soil-extractor mixture over a wavelength range that includes wavelengths in the vicinity of the 200 nm absorption peak (the spectral operating range) and then determines the nitrate-nitrogen concentration based on the attenuation spectrum.
Claims21
-36. (canceled)
A device for measuring a nitrate-nitrogen concentration in soil based on attenuation over a spectral operating range, the device comprising:
- a light source that generates light that spans a spectral operating range;
- a detector having a sensitivity that spans the spectral operating range;
- a sample chamber configured to contain a soil-extractant mixture, the light propagating from the light source to the detector and attenuated by the soil-extractant mixture in the sample chamber, the detector generating a soil spectral signal that indicates the light received by the detector at different wavelengths across the spectral operating range;
- a processor that is coupled to the detector, and that estimates an attenuation spectrum of the soil-extractant mixture over the spectral operating range based on the soil spectral signal, and that estimates the nitrate-nitrogen concentration based on the attenuation spectrum.
A method for measuring a nitrate-nitrogen concentration in soil based on attenuation over a spectral operating range, the method comprising:
- generating light that spans a spectral operating range;
- providing a soil-extractant mixture that attenuates the light;
- detecting the attenuated light;
- generating a soil spectral signal that indicates the light detected at different wavelengths across the spectral operating range;
- estimating an attenuation spectrum of the soil-extractant mixture over the spectral operating range based on the soil spectral signal;
- estimating the nitrate-nitrogen concentration based on the attenuation spectrum.
A device for measuring a nitrate-nitrogen concentration in soil based on attenuation over a spectral operating range, the device comprising:
- a light source that generates light that spans a spectral operating range;
- a detector having a sensitivity that spans the spectral operating range;
- a sample chamber configured to contain a soil-extractant mixture, wherein the light propagates from the light source to the detector and is attenuated by the soil-extractant mixture in the sample chamber, wherein the detector generates a soil spectral signal that represents the light received by the detector at different wavelengths across the spectral operating range;
- a processor coupled to the detector, wherein the processor estimates an attenuation spectrum of the soil-extractant mixture over the spectral operating range based on the soil spectral signal, a reference spectral signal and a dark spectral signal;
- wherein the processor estimates the nitrate-nitrogen concentration based on the attenuation spectrum.
A method for measuring a nitrate-nitrogen concentration in soil based on attenuation over a spectral operating range, the method comprising:
- generating light that spans a spectral operating range;
- providing in a sample chamber, a soil-extractant mixture that attenuates the light;
- detecting the attenuated light with a detector;
- generating a soil spectral signal that indicates the light detected at different wavelengths across the spectral operating range;
- estimating an attenuation spectrum of the soil-extractant mixture over the spectral operating range based on the soil spectral signal, a reference spectral signal and a dark spectral signal;
- wherein the nitrate-nitrogen concentration is estimated based on the attenuation spectrum.
Dependencies are inferred from the claim text.