Gas Sensor Element Concentration Calculation

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Solution Overview

Problem

Conventional methods for calculating the concentration of a detection target gas using two gas sensor elements are inaccurate, as they fail to accurately determine the concentration of the detection target gas and the proportion of two gas components, especially when the test gas contains multiple components.

Innovation Solution

A method involving a gas sensor element that heats to specific temperatures to measure electrical resistance values, allowing for the calculation of the concentration ratio of two gas components, and a reference sensor element to correct calibration curves for precise concentration determination of the detection target gas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a conventional gas sensor element is used to detect alcohol concentration in test gas containing two gas components, then the detection can be performed, but the concentration obtained is inaccurate because it contains interference from the two gas components

Engineering Contradiction:

Improvealcohol concentration detection accuracyVSAvoidconcentration measurement reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent divides the detection process into two separate measurements: one for detecting the combined response to all gas components, and another for detecting the response to the two gas components alone. By segmenting the measurement into these two parts, the system can mathematically separate and calculate the accurate alcohol concentration from the mixed gas components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a reference sensor element that acts as an intermediary to measure the interference from the two gas components. This reference sensor provides data that serves as a mediator to calculate and subtract the interference effect, enabling accurate determination of the detection target gas concentration.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If a reference sensor element is used to remove two gas components, then alcohol detection is possible, but it is difficult to determine the proportion of each of the two gas components

Engineering Contradiction:

Improvealcohol concentration detection accuracyVSAvoidgas component proportion information

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent changes the operating temperature parameter of the gas sensor element to different values. By measuring at multiple temperature points, the system obtains different response characteristics for different gas components, enabling the calculation of both the alcohol concentration and the proportions of the two gas components through mathematical analysis of the temperature-dependent responses.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple gas components are present in test gas, then the gas sensor element responds to all components, but the concentration of the detection target gas cannot be accurately obtained

Engineering Contradiction:

Improvegas component detection capabilityVSAvoiddetection target gas concentration accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent dynamically adjusts the operating temperature of the gas sensor element during the measurement process. By varying the temperature and measuring responses at different temperature points, the system can distinguish between different gas components based on their different temperature-dependent reaction characteristics, thereby achieving accurate determination of the detection target gas concentration despite the presence of multiple components.

Inventive Principle:

Principle #15Dynamics

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 method enables highly accurate calculation of the concentration ratio of two gas components and the concentration of the detection target gas using a single gas sensor element, improving precision and accuracy in gas composition analysis.

Implementation Method 1

heating a gas sensor element to a temperature at which both of two gas components introduced in a gas sensor element react, and maintaining the temperature for a predetermined period to measure an electrical resistance value of the gas sensor element

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Data Source

PatentUS11692957B2Method for calculating concentration of detection target gas

Publication Date: 2023.07.04 NISSHA PRINTING CO LTD

AI summary

The method for calculating concentration ratio includes: (a) heating a gas sensor element to a temperature at which both of two gas components introduced in a gas sensor element react, and maintaining the temperature for a predetermined period to measure an electrical resistance value of the gas sensor element; (b) heating the gas sensor element to a temperature at which only any of the two gas components reacts, and maintaining the temperature for a predetermined period to measure an electrical resistance value of the gas sensor element; and (c) calculating a concentration ratio of the two gas components based on a combination of the electrical resistance value in (a) and the electrical resistance value in (b).