Gas Sensor Differential Noise Cancellation
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Solution Overview
Problem
Existing gas sensors are susceptible to strong interference from sound signals and vibration signals in the external environment, leading to inaccurate detection results.
Innovation Solution
A gas sensor design that includes a substrate, a first housing with a venthole, a first chamber with a first infrared transmitter and a first acoustic sensor, and an environmental detection assembly with a second housing, second infrared transmitter, and second acoustic sensor. A differential processor is used to eliminate ambient sound and vibration signals from the first detection signal based on the second detection signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound wave detection method is used for gas sensing, then the sensor can detect gas concentration, but it becomes susceptible to interference from ambient sound signals and vibration signals
Solution Approach 1:
The sensor is divided into two independent detection channels: a first acoustic sensor for gas concentration detection and a second acoustic sensor for environmental noise detection. By segmenting the detection functions into separate channels, the system can independently process and differentiate between gas-related signals and ambient noise, thereby improving measurement precision while addressing susceptibility to harmful factors.
Solution Approach 2:
The differential processor acts as an intermediary that receives signals from both acoustic sensors and processes their difference. This intermediary component eliminates the need for physical shielding or filtering by mathematically subtracting the noise signal from the gas detection signal, resolving the contradiction between maintaining detection accuracy and rejecting ambient interference.
2Device complexity
If a single acoustic sensor is used for gas detection, then the device structure remains simple, but detection accuracy deteriorates due to noise interference
Solution Approach 1:
The detection system is segmented into two functional units: a first acoustic sensor dedicated to gas detection and a second acoustic sensor dedicated to noise detection. This segmentation enables the system to maintain structural simplicity while improving measurement precision through differential processing, as each sensor has a dedicated function and the combination remains compact.
Solution Approach 2:
The system changes the operational parameters by using two acoustic sensors with different functional assignments rather than one sensor attempting to do both. The differential processor changes the signal processing parameter by computing the difference between the two sensor outputs, thereby extracting the gas concentration signal while eliminating ambient noise, achieving high precision without excessive structural complexity.
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 solution effectively eliminates external noise and vibration interference, resulting in accurate gas concentration measurements and improved detection accuracy.
Implementation Method 1
the infrared transmitter emits infrared light of a specific wavelength at a certain sound frequency (e.g., 30 Hz). This wavelength of the infrared light is strongly absorbed by the gas to be measured and converted into heat
Implementation Method 2
An alternating pressure signal is generated in the internal chamber, which is received by the acoustic sensor and converted into an electric signal
Data Source
AI summary
The present disclosure provides a gas sensor, including a substrate, a first housing fixed on the substrate and enclosed with the substrate to form a first chamber, and a first infrared transmitter and a first acoustic sensor connected to the substrate. The first acoustic sensor and the first infrared transmitter are housed in the first chamber, and the first housing is provided with a first venthole. The gas sensor also includes an environmental detection assembly connected to the substrate and located outside the first housing, and a differential processor connected to the substrate. The differential processor of the present disclosure can eliminate the ambient sound signal and the vibration signal in the first detection signal according to the second detection signal. Eliminate the strong interference of noise and vibration in the external environment, and improve the accuracy of the gas concentration detection of the gas sensor.