Multi-Gas Sensing System Using Impedance Analysis
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Solution Overview
Problem
Existing gas sensors face challenges in detecting multiple gases with high selectivity and accuracy, requiring multiple sensors and complex calibration, and are often bulky, costly, and power-intensive, making them inconvenient for use in complex environments.
Innovation Solution
A multi-gas sensing system with a single type of sensor using a resistor-capacitor (RC) electrical circuit that changes configurations in response to gases, employing a management circuit to excite sensing elements with alternating current at specific frequencies and measure impedance responses, allowing for discrimination and quantification of multiple gases using statistical methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple different sensors are used to detect multiple gases, then detection selectivity and accuracy are improved, but device complexity, power consumption, and size increase
Solution Approach 1:
The patent applies universality by using a single sensor type with multiple sensing elements that can detect multiple different gases. The sensing elements are designed with sensing materials that respond to various gas analytes, allowing one sensor platform to perform multiple detection functions. This eliminates the need for multiple specialized sensors while maintaining detection accuracy through the use of impedance analysis and statistical processing of responses from multiple elements.
2Measurement precision
If multiple different sensors are used to detect multiple gases, then detection selectivity is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple sensing functions into a single sensor platform. By combining multiple sensing elements within one sensor device and using a shared impedance analysis circuit, the system reduces the total power consumption compared to using multiple independent sensors. The management circuit efficiently manages power by sequentially exciting different sensing elements and processing their combined responses to identify multiple gases.
3Measurement precision
If multiple different sensors are used to detect multiple gases, then detection accuracy is improved, but size increases
Solution Approach 1:
The patent implements nesting by placing multiple sensing elements within a single sensor housing. The sensing elements are integrated into one compact structure, with each element containing sensing material that responds to different gas analytes. This nested arrangement allows multiple detection capabilities to coexist in a small volume, maintaining high detection accuracy while minimizing the overall sensor system size.
4Measurement precision
If traditional analytical instruments are used for gas detection, then detection selectivity and accuracy are improved, but power consumption, size, and cost increase
Solution Approach 1:
The patent replaces complex mechanical analytical instruments with an electrical impedance-based sensing system. Instead of using mechanical gas chromatography or mass spectrometry equipment, the invention uses electrical excitation of sensing elements and measures impedance changes to detect gases. This substitution dramatically reduces power consumption, size, and cost while maintaining detection accuracy through sophisticated signal processing of the electrical responses.
5Measurement precision
If traditional analytical instruments are used for gas detection, then detection accuracy is improved, but device size increases
Solution Approach 1:
The patent creates a simplified electrical copy of traditional analytical detection principles. Instead of physically implementing complex mechanical separation and detection systems, the invention uses electrical impedance measurements that replicate the detection functionality. The sensing elements with their sensing materials provide a compact electrical analog to traditional analytical instruments, achieving similar detection accuracy in a much smaller form factor through non-mechanical means.
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 accurately detects multiple gases with a single sensor type, reducing power consumption and size, while maintaining high selectivity and accuracy, and can be integrated into wearable or portable devices for continuous monitoring.
Implementation Method 1
employing a management circuit to excite sensing elements with alternating current at specific frequencies and measure impedance responses
Implementation Method 2
The impedance analyzer measures a response of the first sensing element at one or more frequencies at a dielectric relaxation peak of the sensing material
Implementation Method 3
A management circuit is configured to excite the one or more sensing elements with an alternating current at at least one predetermined frequency
Implementation Method 4
a second sensing element is a mechanical resonator coated with the sensing material. The impedance analyzer measures a resonant peak frequency position of the second sensing element
Data Source
AI summary
A multi-gas sensing system includes a sensing circuit comprising one or more sensing elements. Each sensing element includes a sensing material configured to detect at least one gas analyte. A management circuit is configured to excite the sensing elements with an alternating current at at least one predetermined frequency. The management circuit measures one or more electrical responses of the sensing elements responsive to exciting the sensing elements with the alternating current. The management circuit determines one or more characteristics of the sensing circuit. One or more processors receive the electrical responses of the sensing elements and the characteristics of the sensing circuit. The one or more processors determine a concentration of the at least one gas analyte based on the electrical responses of the sensing elements and the characteristics of the sensing circuit.