Re-breathing Analyzer Thermal Measurement
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Solution Overview
Problem
Conventional methods for testing bedding materials for re-breathing susceptibility require complex and expensive equipment, necessitating expert operation to measure carbon dioxide levels, which is not practical for reliable and repeatable results.
Innovation Solution
A re-breathing analyzer that uses heated air to determine re-breathing by measuring the temperature difference between the air supplied and the air returned from the material under test, eliminating the need for carbon dioxide gas analyzers and simplifying the testing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional carbon dioxide analyzers are used to measure re-breathing, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/chemical CO2 analyzer system with a thermal measurement system. Instead of measuring carbon dioxide concentration directly, the system measures temperature changes of air as it passes through the bedding material. The heated air (at a known temperature) is supplied to the material, and the return air temperature is measured. If the material retains heat, it indicates the material is trapping exhaled air, which correlates with re-breathing risk. This substitution eliminates complex CO2 sensing while maintaining measurement capability through an alternative physical parameter (temperature).
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to indirectly measure re-breathing. Rather than directly measuring CO2 concentration, the system uses temperature change of air as a mediator that reflects the presence of trapped exhaled air. The heated air serves as a tracer that reveals whether the material is retaining breath, providing an indirect but effective measurement of re-breathing susceptibility without requiring direct CO2 analysis.
2Measurement precision
If expert operation is required for reliable measurements, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-calibration and self-measurement without requiring expert intervention. The automated process supplies heated air at a controlled temperature, measures the return air temperature, and automatically calculates re-breathing metrics. The system self-regulates the test parameters and independently generates results, eliminating the need for operators to perform complex calibration procedures or interpret complex data, thereby making the system easy to operate while maintaining precision.
Solution Approach 2:
The patent changes the measurement parameter from CO2 concentration to temperature, which simplifies the operational requirements. Temperature measurement is inherently more straightforward and requires less specialized knowledge than CO2 analysis. The system maintains measurement precision by controlling and monitoring the heated air temperature parameter, automatically adjusting for environmental conditions, and using temperature differential as the primary measurement metric, which is easier to obtain reliably without expert operation.
3Measurement precision
If carbon dioxide analyzers are used, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive, sophisticated CO2 analyzer equipment with inexpensive temperature sensing components. The system uses simple thermocouples or temperature sensors that are far cheaper than commercial CO2 analyzers. The heated air supply system uses basic heating elements and airflow control, eliminating the need for costly gas metering and analysis equipment. This substitution dramatically reduces the cost of the testing system while maintaining the ability to accurately assess re-breathing through temperature-based measurement.
Solution Approach 2:
The patent substitutes the expensive CO2 analysis mechanism with a low-cost thermal measurement approach. Instead of investing in sophisticated gas detection equipment, the system uses inexpensive temperature sensors and controlled heating elements to achieve the same information goal. The heated air temperature measurement provides a cost-effective alternative to CO2 concentration measurement, significantly reducing equipment costs while maintaining assessment accuracy for re-breathing risk.
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
The analyzer effectively assesses re-breathing by measuring temperature changes, providing a straightforward and cost-effective method to determine the extent of carbon dioxide retention in bedding materials, thereby identifying potential suffocation hazards.
Implementation Method 1
The re-breathing analyzer includes a heated air supply directed to the material under test and a return air line from the material under test
Implementation Method 2
monitors the temperature of air returned from the material under test through a return line or conduit. The temperature of the return line is a proxy for the carbon dioxide resulting from re-breathing
Data Source
AI summary
Apparatus for quantifying the amount of re-breathing due to bedding materials. The re-breathing analyzer applies heated air to the material under test through an exhaust port in a probe and receives return air from an intake port in the probe. The exhaust and intake ports are placed to engage the material under test when the probe is in contact with the material. In one embodiment, the probe has a surface that is exposed through a top surface of a housing for the analyzer whereby the material under test is placed on the top surface for testing. The analyzer includes a differential temperature measuring instrument that determines the temperature of the return air, where an increase of the temperature of the return air above the temperature of the ambient air indicates the presence and quantity of re-breathing due to the material under test.