Dual IR Alcohol Detection Device with Redundant Channels
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Solution Overview
Problem
Existing alcohol detection devices lack reliability and often require frequent replacement of chemicals, which can be hazardous, and struggle to distinguish alcohol from other substances in breath samples.
Innovation Solution
A device with two independent IR detection units using the same measuring chamber, each emitting and detecting IR beams at different wavelengths, allowing for comparison of signals to determine alcohol presence and concentration while being less susceptible to interference from other substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single IR detection unit is used, then the device complexity is reduced, but the reliability of alcohol detection decreases
Solution Approach 1:
The single detection unit is segmented into two independent IR detection units, each with its own IR radiation source and detector. This segmentation allows parallel measurement of alcohol concentration through different wavelength ranges, improving reliability through redundancy while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The two IR detection units operate at different wavelength ranges (first unit: 3.0-5.0 μm, second unit: 5.0-8.0 μm), utilizing parameter changes in the measurement process. This enables differentiation between alcohol and other substances based on their distinct infrared absorption spectra, enhancing detection reliability without significantly increasing overall system complexity
2Reliability
If chemicals are used for alcohol detection, then the detection method is simplified, but safety hazards and maintenance requirements increase
Solution Approach 1:
The chemical-based detection method is replaced with a physical infrared spectroscopy method. IR radiation sources emit infrared beams that pass through the gas sample, and IR detectors measure the absorption at specific wavelengths. This substitution eliminates all chemical hazards associated with traditional methods while providing reliable, non-invasive alcohol detection
Solution Approach 2:
The measurement process uses inert IR radiation and detection in a controlled optical path environment, replacing reactive chemical substances with non-reactive physical fields. This creates a safe detection environment free from chemical hazards while maintaining high detection reliability through wavelength-specific absorption measurements
3Volume of moving object
If a single measuring chamber is used for both detection units, then the device compactness is improved, but the risk of cross-interference between measurements increases
Solution Approach 1:
The two IR detection units perform measurements in a periodic or sequential manner within the same measuring chamber. The control unit coordinates the operation of both detection units, allowing them to share the chamber while maintaining measurement integrity through time-sequenced or alternately activated detection cycles
Solution Approach 2:
The control unit acts as an intermediary that manages the shared measuring chamber resource. It coordinates the operation of both IR detection units, ensuring proper timing and sequence of measurements to prevent cross-interference while maximizing the utilization of the compact single-chamber design
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 device provides a more reliable and compact alcohol detection system that can distinguish alcohol from other substances, reducing the need for chemical replacements and enhancing accuracy and safety.
Implementation Method 1
an infrared beam (IR beam) is emitted into the measuring chamber, penetrates the gas sample in the measuring chamber and strikes a photosensor, which depends on the Intensity of the incident IR beam produces a measured value. Alcohol in the gas sample causes attenuation and therefore reduces the light intensity in a certain wavelength range
Data Source
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AI summary
The invention relates to a device and a method for detecting alcohol in a gas sample, in particular in an exhaled breath sample. A measuring chamber (2) receives the gas sample to be examined. Two IR radiation sources (7, 11) are each capable of emitting an IR beam into the measuring chamber (2). Two IR detectors (9, 13) each generate a measurement value depending on an incident IR beam. An evaluation unit (10) automatically decides whether the gas sample contains alcohol or not, based on the two measurement values from the two IR detectors (9, 13).