Breath Sensor Flow Control for Moisture and Temperature Management
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Solution Overview
Problem
Portable breath sensors face challenges in accurately measuring exhaled breath parameters due to moisture and temperature variations, which affect sensor accuracy and stability, especially in compact devices.
Innovation Solution
The integration of a flow control assembly with a sampling chamber and filters to divert and vent a majority of the breath sample, reducing moisture and temperature, while using sensors like chemical gas sensors to detect parameters like carbon monoxide, and employing calibration curves to estimate final values from transient signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the breath sensor is made portable and compact, then ease of operation and portability are improved, but measurement precision deteriorates due to moisture and temperature variations affecting sensor accuracy
Solution Approach 1:
The breath sampling system is divided into multiple functional segments: a flow control assembly with dispersion channel that handles bulk breath flow, secondary channels for venting, and a receiving channel with sampling chamber that isolates the sensor. This segmentation allows the sensor to be protected from direct exposure to harsh breath conditions while maintaining portability.
Solution Approach 2:
A receiving channel and sampling chamber act as intermediary structures between the breath sample and the sensor. These intermediaries buffer the sensor from direct contact with moisture-rich and temperature-variable breath, allowing the compact portable device to maintain measurement precision.
2Measurement precision
If a larger mass and longer flow paths are used to reduce temperature and remove moisture, then measurement precision is improved, but device complexity and size increase
Solution Approach 1:
The flow control assembly uses a three-dimensional channel configuration with a dispersion channel branching into multiple secondary channels. This spatial arrangement increases the effective flow path length and surface area for moisture removal without proportionally increasing the overall device volume, enabling better temperature and moisture control in a compact form factor.
Solution Approach 2:
The sampling chamber is positioned within the receiving channel, creating a nested structure where the sensor chamber is embedded in the flow path. This nesting allows the system to achieve longer effective flow paths and better temperature/moisture control without increasing the external device dimensions.
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 enables accurate and reliable detection of breath parameters in portable devices by minimizing moisture and temperature impacts, allowing for effective monitoring of smoking behavior and other health indicators.
Implementation Method 1
the sampling chamber is configured to receive the breath sample into the sampling chamber and into contact with the at least one sensor via diffusion into the sampling chamber
Implementation Method 2
The integration of a flow control assembly with a sampling chamber and filters to divert and vent a majority of the breath sample, reducing moisture and temperature
Implementation Method 3
using sensors like chemical gas sensors to detect parameters like carbon monoxide
Data Source
AI summary
Breath sensor apparatus and methods of use are described herein where a flow control apparatus may generally comprise a sampling chamber defining a volume and one or more openings into the sampling chamber, at least one sensor in fluid communication with the sampling chamber, wherein the at least one sensor is configured to detect the analyte. The sampling chamber may also be configured to receive the breath sample into the sampling chamber and into contact with the at least one sensor via diffusion into the sampling chamber.