Eructation Counting for Ruminant Methane Emission Measurement
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Solution Overview
Problem
Existing methods for determining greenhouse gas emissions from ruminants, particularly methane, are complex and unsuitable for large-scale application due to the need for tracer gases and invasive procedures, which are not practical for herds of animals and pose environmental concerns.
Innovation Solution
A method and device that measure and count eructations to estimate methane emissions by recognizing the consistent percentage of methane in belches, using acoustic and pressure sensors to filter and analyze sound and pressure signals, allowing for calibration to provide accurate, animal-specific emission values without the need for tracer gases or invasive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tracer gas tube and gas analysis equipment are used to measure greenhouse gas emissions, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The invention extracts only the essential measurement function from the complex tracer gas system. Instead of using SF6 tracer gas tubes and laboratory analysis equipment, the patent uses simple acoustic sensors to detect eructation sounds and applies the known constant methane proportion (25-35%) to calculate emissions. This extracts the core measurement capability while eliminating unnecessary complexity.
Solution Approach 2:
The invention creates a simplified copy of the measurement process. Rather than directly measuring methane concentration with complex equipment, it copies the eructation sound signal and processes this acoustic copy to derive emission data. The sound signal serves as a proxy that contains all necessary information when combined with the known methane proportion.
2Measurement precision
If tracer gas (SF6) is used to determine methane emission, then measurement precision is improved, but object-generated harmful factors increase
Solution Approach 1:
The invention converts the harmful tracer gas approach into a beneficial acoustic detection approach. Instead of introducing a harmful substance (SF6 with 1000x greater GWP than methane) to enable measurement, it uses the naturally occurring eructation sound as the measurement medium. The sound itself, which is harmless, becomes the carrier of measurement information when combined with knowledge of methane's constant proportion in eructations.
3Device complexity
If simple eructation counting method is used, then device complexity is reduced and ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The invention changes the measurement parameter from direct methane concentration measurement to eructation sound detection combined with duration measurement. By measuring the duration of each eructation event and applying the known constant methane proportion (25-35%), the system achieves accurate emission quantification through a simple device. The parameter transformation from chemical analysis to acoustic-temporal measurement resolves the precision-simplicity contradiction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the measurement of methane emissions, making it feasible for large groups of animals, providing accurate and reliable data on emissions while avoiding the environmental impact and complexity of previous methods.
Implementation Method 1
measuring of a signal related to eructations of the ruminant
Data Source
AI summary
A method and a device for determining the emission of greenhouse gas, in particular methane, by ruminants, in particular dairy animals includes counting eructations (“belches”) of the animal. This is done by measuring a signal linked to the eructations, for example sound with a microphone. Given that the methane content of an eructation of this type is more or less constant, the total methane emission can be derived therefrom by counting.