Gas Sensor Condensation Detection via Dual Light Paths
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Solution Overview
Problem
Conventional gas sensors face challenges in accurately measuring gas concentrations due to interference from condensation, which can lead to false-positive readings and reduced signal-to-noise ratios.
Innovation Solution
The proposed gas sensor employs a light emitting unit, a first light receiving unit, and an operating unit that calculates a baseline signal to differentiate between gas absorption and condensation effects, using a dynamic cut-off frequency adjustment to improve baseline followability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas sensors are used to measure gas concentration, then the measurement can be performed, but condensation interference causes false-positive readings and reduced measurement precision
Solution Approach 1:
The patent divides the light receiving function into two separate units: a first light receiving unit that receives light through the gas sample path and a second light receiving unit that receives reference light. This segmentation allows the system to separately measure gas absorption effects and condensation effects, enabling accurate differentiation between the two phenomena and eliminating false-positive readings.
Solution Approach 2:
The patent introduces a reference light path with a second light receiving unit as an intermediary element. This reference path does not pass through the gas sample but provides a baseline for comparison. By comparing the signal from the first light receiving unit (through gas path) with the second light receiving unit (reference path), the system can eliminate condensation interference and accurately measure gas concentration.
2Productivity
If baseline calculation is performed with fixed cut-off frequency, then the baseline can be calculated, but the baseline follows gas absorption changes too quickly, reducing measurement accuracy
Solution Approach 1:
The patent implements dynamic adjustment of the cut-off frequency in the baseline calculation filter. The cut-off frequency is not fixed but varies based on the measurement conditions and signal characteristics. This dynamic adjustment allows the baseline to adapt to different gas absorption rates while maintaining stability, preventing the baseline from following rapid gas absorption changes and ensuring accurate measurements.
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 approach enhances the accuracy of gas concentration measurements by effectively distinguishing between gas absorption and condensation, thereby reducing false positives and improving signal quality.
Implementation Method 1
a light emitting unit 16, a first light receiving unit 18... The light emitting unit 16 emits light 14 toward a path 12 through which a gas to be sensed passes. A part of the light 14 passes through the path 12 and enters the first light receiving unit 18.
Implementation Method 2
an operating unit 20 that performs operation on the first light reception signal... calculates a baseline signal to differentiate between gas absorption and condensation effects, using a dynamic cut-off frequency adjustment
Data Source
AI summary
Provided is a gas sensor that senses gas to be sensed, comprising a light emitting unit that radiates light; a first light receiving unit that receive at least a part of the light that passed through the gas to be sensed, and outputs a first light reception signal according to a light reception result; a second light receiving unit that receives at least a part of the light that did not pass through the gas to be sensed, and outputs a second light reception signal according to a light reception result; and an operating unit that senses that condensation has occurred in a light path from the light emitting unit to the first light receiving unit based on the first light reception signal and the second light reception signal.