Inelastic Neutron Soil Analysis With Moisture Correction
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Solution Overview
Problem
Existing soil analysis methods are inaccurate due to temperature fluctuations and moisture content variations, leading to unreliable elemental and moisture content measurements across large geographic areas, and current sampling techniques are labor-intensive and time-consuming.
Innovation Solution
A system using a neutron generator and gamma detectors, combined with temperature-controlled housing and moisture correction methods, to generate detailed elemental and moisture content maps by stabilizing detector temperatures and applying hydrogen peak coefficients for accurate soil analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If composite sampling is used to analyze soil elemental content, then the analysis process is simplified and requires fewer subsamples, but the measurement precision and accuracy of elemental content analysis deteriorates
Solution Approach 1:
The patent replaces manual mechanical sampling methods with a mobile scanning system that uses neutron generators and gamma detectors to non-contactually measure elemental content directly in the soil, eliminating the need for physical subsampling while maintaining high measurement precision
Solution Approach 2:
The system changes the measurement parameters by using neutron-induced gamma radiation to detect elemental content, allowing continuous scanning across the entire field area rather than discrete sampling points, thereby improving both ease of operation and measurement precision simultaneously
2Device complexity
If gamma spectra analysis is performed without temperature control, then the device complexity is reduced, but the measurement precision of elemental content deteriorates due to temperature fluctuations
Solution Approach 1:
The patent implements temperature control for the gamma detectors to stabilize their operating conditions, ensuring consistent and accurate measurements. This parameter change (temperature stabilization) directly improves measurement precision while the mobile cart design keeps the overall system complexity manageable
Solution Approach 2:
The patent introduces temperature-controlled housing as an intermediary system between the detectors and the external environment, isolating the detectors from temperature fluctuations and maintaining stable measurement conditions without requiring the entire mobile system to be complex
3Device complexity
If soil moisture content is not accounted for in the analysis, then the analysis process is simpler, but the reliability of elemental content determination deteriorates due to moisture variations
Solution Approach 1:
The patent incorporates moisture content measurement as a feedback parameter in the analysis methodology. By measuring moisture content separately and using it to correct the gamma spectra analysis, the system maintains high reliability of elemental content determination while adding only minimal complexity to the overall process
Solution Approach 2:
The patent uses moisture content as an intermediary correction factor that mediates between the raw gamma spectra data and the final elemental content calculation, improving reliability by accounting for moisture effects without requiring complete redesign of the analysis methodology
4Measurement precision
If detailed elemental content mapping is performed across large fields, then the measurement precision and accuracy improve, but the loss of time increases due to extended scanning requirements
Solution Approach 1:
The patent implements continuous scanning of the mobile cart across the field, maintaining constant measurement operation without interruption. This continuous action allows comprehensive coverage of large fields efficiently, improving measurement precision while minimizing time loss through uninterrupted data collection
Solution Approach 2:
The system replaces time-consuming manual sampling and laboratory analysis with automated mobile scanning using neutron generators and gamma detectors, enabling rapid, continuous measurement across large fields and significantly reducing the time required for detailed elemental content mapping
Data Source
AI summary
Systems and methods for measuring the content of an element in a soil comprises: a neutron source for irradiating the soil with neutrons; a detector assembly configured to detect an INS gamma spectrum of the soil; an instrument for measuring a moisture content of the soil; and a processor in communication with the detector assembly, the processor configured to: apply a moisture calibration coefficient to calculate a net peak area of a characteristic peak of the element in the INS gamma spectrum, the moisture calibration coefficient calculated to account for the moderation of fast neutrons by hydrogen atoms of water present in the irradiated soil at the location under analysis; and generate a concentration of the element in the soil. The instrument for measuring a moisture content of the soil may comprise the detector assembly. Systems and methods incorporating a temperature-controlled housing for the gamma detector assembly are also provided.