Gas Sensor Electrochemical Cell Signal Separation
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Solution Overview
Problem
Existing gas sensors face challenges in simultaneously detecting gas concentration and temperature with high accuracy and noise resistance, as conventional methods require separate processes for DC and AC voltage applications, leading to discontinuous detection and noise interference.
Innovation Solution
A gas sensor design incorporating an electrochemical cell with a detection circuit unit that applies an AC voltage, separates DC and AC signal components, and performs synchronous detection to extract temperature information, allowing for simultaneous gas concentration and temperature detection with noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate processes for DC and AC voltage applications are used, then gas concentration and temperature can be detected, but detection continuity is broken and noise interference increases
Solution Approach 1:
The patent combines DC and AC voltage applications into a single unified process. The detection circuit simultaneously extracts both DC signal components (for gas concentration) and AC signal components (for temperature) from the electrochemical cell output, eliminating the need for separate detection processes and ensuring continuous operation without interruption or noise interference.
Solution Approach 2:
The detection circuit is designed to perform multiple functions simultaneously: it detects both gas concentration and temperature using the same electrochemical cell and voltage application system. This multi-functional approach allows continuous detection of both parameters without requiring separate dedicated processes, thereby improving detection continuity while maintaining accuracy.
2Measurement precision
If separate DC and AC voltage application processes are used, then gas concentration and temperature detection are possible, but device complexity increases
Solution Approach 1:
The patent merges the detection circuits for DC and AC signal processing into a single integrated system. The same detection circuit handles both the DC component extraction for gas concentration measurement and the AC component extraction for temperature measurement, thereby reducing device complexity while maintaining the precision of both detection functions.
Solution Approach 2:
The detection circuit is designed as a universal system that can process both DC and AC signals from the electrochemical cell. This multi-functional circuit eliminates the need for separate dedicated circuits for each parameter, simplifying the overall device structure while preserving the accuracy of both gas concentration and temperature detection.
3Measurement precision
If continuous AC voltage application is used with synchronous detection, then temperature detection accuracy improves, but signal processing complexity increases
Solution Approach 1:
The patent introduces synchronous detection as an intermediary processing step that simplifies the extraction of temperature information from AC signals. By using the AC voltage signal itself as a reference for synchronous detection, the system efficiently isolates the temperature-related AC components without requiring complex external reference signals or elaborate processing circuits, thereby improving temperature accuracy while keeping signal processing manageable.
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
Enables continuous, high-accuracy detection of gas concentration and temperature information, reducing noise interference and improving detection efficiency.
Implementation Method 1
an electrochemical cell having a pair of electrodes on the surface of a solid electrolyte layer conducting oxide ions
Implementation Method 2
a solid electrolyte layer conducting oxide ions
Data Source
AI summary
A gas sensor includes a detection circuit unit that detects a specific gas component in measured gas based on output from a sensor element. The detection circuit unit includes an AC voltage application unit that applies an AC voltage signal to a pair of electrode units in an electrochemical cell, a gas concentration detection unit that detects concentration information on the specific gas component from a DC signal component included in an output signal provided by the electrochemical cell, and a cell temperature detection unit that detects temperature information on the electrochemical cell from an AC signal component included in the output signal. The cell temperature detection unit includes a signal extraction unit that removes the DC signal component to separate the AC signal component from the output signal, and a synchronous detection unit that performs synchronous detection on the separated AC signal component using the AC voltage signal.