Odor Detection System Using Environmental Feedback for Sensor Stability
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Solution Overview
Problem
The chemical sensor device for odor detection experiences variations in detection results for gases with identical composition ratios due to changes in environmental conditions such as humidity and the number of measurements, affecting the sensitivity of the sensitive membranes.
Innovation Solution
An odor detection system that includes a substance sensor with sensitive membranes and an information-processing device. The system processes reaction values from the sensitive membranes to reduce variations in detection results by correcting for environmental conditions, such as humidity, using coefficients specific to each sensitive membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the chemical sensor device uses sensitive membranes to detect substances, then odor detection capability is enabled, but detection results vary due to environmental conditions such as humidity and number of measurements
Solution Approach 1:
The system measures environmental conditions (humidity, temperature) and uses this feedback to automatically adjust correction coefficients, ensuring consistent detection results despite environmental variations. The correction coefficient calculation unit continuously adapts based on measured environmental parameters.
Solution Approach 2:
The patent changes the parameters used for odor identification from raw sensor values alone to a combination of sensor values and environmental parameters. By incorporating humidity and temperature as additional parameters and using them to adjust correction coefficients, the system achieves more stable and reliable detection results across different environmental conditions.
2Measurement precision
If correction coefficients are determined for each sensitive membrane to account for environmental conditions, then detection accuracy improves, but system complexity increases
Solution Approach 1:
The correction coefficient calculation unit serves multiple functions: it calculates correction coefficients for different sensitive membranes, adapts to various environmental conditions (humidity, temperature), and works with different odor substances. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The system automatically determines and updates correction coefficients based on measured environmental conditions without requiring manual intervention or external calibration. The correction coefficient calculation unit self-adjusts the coefficients by processing environmental data and sensor outputs, making the system self-calibrating.
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 system effectively reduces variations in odor detection results regardless of environmental changes or the number of measurements, ensuring accurate and consistent detection of odors.
Implementation Method 1
Each vibrator, including a piezoelectric substrate, is vibrated by applying an alternating voltage to the piezoelectric substrate to deform the piezoelectric substrate
Implementation Method 2
when any of sensitive membranes adsorbs or desorbs the substance
Implementation Method 3
when any of sensitive membranes adsorbs or desorbs the substance
Data Source
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AI summary
A substance sensor (10) includes sensitive membranes (11 (a to j)) to react with substances (a to j) included in the odors of a gas in correspondence with the substances (a to j), and is configured to detect the reaction values of the sensitive membranes (11 (a to j)). An odor specifier (22) specifies the odors of the gas on the basis of the reaction values of the sensitive membranes (11 (a to j)), detected by the substance sensor (10). A reaction value calculator (23) calculates reaction values corresponding to the odors specified by the odor specifier (22) on the basis of the reaction values of the sensitive membranes (11 (a to j)), detected by the substance sensor (10). A percentage calculator (24) calculates the percentages of the reaction values corresponding to the odors specified by the odor specifier (22) to the total of the reaction values corresponding to the odors, calculated by the reaction value calculator (23). A display (25) displays the percentages of the reaction values corresponding to the odors, calculated by the percentage calculator (24), so that comparison of the percentages is enabled between the odors specified by the odor specifier (22).