Dual-Sided Heated Breath Alcohol Sensor for Fast Readiness
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Solution Overview
Problem
Prior alcohol-measuring devices with electrochemical sensors experience long delays in achieving operational readiness due to temperature gradients caused by single-sided heating, leading to distorted sensor signals and delayed accurate measurements.
Innovation Solution
The implementation of heating elements on both the front and rear sides of the electrochemical sensor, along with a control unit to manage heat distribution and minimize temperature gradients, ensures faster heating and reduces thermally induced currents, allowing for quicker operational readiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single heating element is used to heat the electrochemical sensor, then the sensor can be heated to operating temperature, but a temperature gradient develops over the sensor membrane causing distorted signals and delayed operational readiness
Solution Approach 1:
The heating system is segmented into multiple heating elements positioned at different locations (front side and rear side) of the sensor. This segmentation allows independent control of heating zones to achieve uniform temperature distribution across the sensor membrane, eliminating temperature gradients that cause measurement errors.
Solution Approach 2:
Different regions of the sensor are heated with different heating elements to achieve local temperature control. The front-side heating element and rear-side heating element provide localized heating that collectively creates uniform temperature distribution across the entire sensor membrane, improving measurement precision.
2Loss of time
If heating elements are added on both sides of the sensor, then temperature uniformity and operational readiness speed improve, but device complexity increases
Solution Approach 1:
Multiple heating elements are merged into a coordinated heating system where the front-side heating element and rear-side heating element work together under unified control. This combining approach achieves rapid and uniform heating while managing complexity through integrated control logic in the control unit.
Solution Approach 2:
The heating system parameters (temperature, heating power, timing) are dynamically adjusted by the control unit based on sensor feedback and pre-programmed sequences. This parameter control enables fast operational readiness while managing the complexity of multiple heating elements through automated regulation.
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 faster operational readiness of the alcohol-measuring device by minimizing temperature gradients and reducing the time needed for accurate measurements, improving measurement accuracy and reducing delays in interlock systems.
Implementation Method 1
temperature gradients caused by single-sided heating, leading to distorted sensor signals
Implementation Method 2
heating elements on both the front and rear sides of the electrochemical sensor
Implementation Method 3
the substance to be analyzed (alcohol or ethanol) is electrochemically oxidized on the catalyst layer of the measuring electrode
Implementation Method 4
The method for breath alcohol determination by means of an electrochemical sensor is based on the principle of a fuel cell
Implementation Method 5
an electrochemical sensor for monitoring the alcohol by a diffusion current
Data Source
AI summary
An alcohol-measuring device includes a mouthpiece (1), designed to enable a test subject to release breathing air into the mouthpiece, an electrochemical sensor (6), in fluidic connection with the mouthpiece (1) to measure alcohol in the breathing air of the test subject and a control unit. The sensor (6) has at least two heating elements (9, 10), one heating element arranged on the front side and one heating element arranged on the rear side of the sensor (6). The control unit (4) is electrically connected to the heating elements to supply electrical energy for the heating elements. The control unit (4) is set up to heat the heating elements each to a desired temperature. The control unit (4) is also electrically connected to the sensor (6) in order to determine the value of the alcohol concentration in the breathing air of the test subject.