Breath Sensor Airflow Disrupting Element for Temperature Stability
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Solution Overview
Problem
Existing breath sensors face temperature fluctuations due to varying flow rates of exhaled breath, leading to inconsistent and inaccurate measurements, especially when operating at high temperatures required for detecting volatile organic compounds.
Innovation Solution
A breath testing apparatus with a chamber, gas inlet, gas outlet, and an airflow disrupting element positioned near the sensor to redistribute airflow, reducing heat loss by convection and maintaining a consistent operating temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor operates at high temperatures (100-500°C) to detect volatile organic compounds, then the detection capability is improved, but the sensor is susceptible to temperature fluctuations caused by convective heat loss from breath flow
Solution Approach 1:
A flow redistribution element is introduced as an intermediary component between the breath flow and the sensor. This element mediates the interaction by redistributing the breath flow to minimize direct convective heat loss to the sensor while still allowing analyte molecules to reach the sensor surface for detection.
Solution Approach 2:
The flow redistribution element creates localized flow patterns with different characteristics at different locations. By controlling the flow distribution locally around the sensor, the system maintains optimal conditions for both temperature stability and analyte detection.
2Temperature
If the analyte reaches the sensor by diffusion in a mesh enclosed chamber, then the temperature field is protected and sensor temperature is maintained, but the detection of compounds from breath is altered due to flow mechanism
Solution Approach 1:
The flow redistribution element changes the flow parameters (velocity distribution, flow direction) without fundamentally altering the diffusion-based transport mechanism. By adjusting flow parameters locally, the system maintains the protective temperature field while enabling accurate detection of breath compounds.
3Adaptability or versatility
If the flow rate of exhaled breath varies from person to person, then the natural breath sampling is maintained, but the convection heat loss cannot be easily predicted and causes temperature fluctuations
Solution Approach 1:
The flow redistribution element serves as a buffer or intermediary that decouples the variable breath flow from the sensor. It absorbs the variations in flow rate and redistributes the flow in a manner that minimizes heat loss, making the sensor response more consistent across different users and breath conditions.
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 apparatus provides more consistent and accurate results for detecting volatile organic compounds by stabilizing the sensor temperature and reducing the impact of flow rate variations.
Implementation Method 1
flow over the sensor causes heat loss by convection
Implementation Method 2
detecting volatile organic compounds
Data Source
AI summary
A breath sensor apparatus for detecting the presence of a compound in an exhaled gas sample, the apparatus comprising a chamber for retaining a gas sample, the chamber defining a gas inlet and a gas outlet, a sensor inside the chamber for analyzing the gas sample, an airflow disrupting element disposed proximate to the sensor to affect the airflow near the device, and an airflow reducing element disposed over the gas outlet to increase the retention time of the gas sample within the chamber.