Partitioned Gas Sensor Housing for Resonance Noise Suppression
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Solution Overview
Problem
Gas sensors in apparatuses with sound-emitting functions, such as smart home devices, suffer from reduced detection accuracy due to resonance induced by air vibrations, particularly affecting microstructure-based detectors.
Innovation Solution
The apparatus is designed with a gas measurement unit demarcated by a partition, featuring a hole with specific dimensions and a vent pipe, and the resonance frequency is set outside the frequency band of unwanted sound to minimize vibration interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the gas sensor is placed in the same housing as the vibration source (speaker, motor), then the apparatus can be miniaturized and integrated, but the detection accuracy degrades due to resonance-induced vibration noise
Solution Approach 1:
The housing is divided into a vibration source chamber and a gas measurement chamber by a partition wall. The gas sensor is placed in the gas measurement chamber, separated from the vibration source, thereby reducing vibration-induced resonance while maintaining apparatus miniaturization through integrated compact design
Solution Approach 2:
A partition wall with a hole acts as an intermediary structure between the vibration source chamber and gas measurement chamber. The hole dimensions are specifically designed to suppress resonance while allowing gas diffusion, serving as a mediator that blocks vibration transmission but permits gas passage
2Speed
If the hole in the partition is made larger to improve gas diffusion, then the response time improves, but the resonance frequency decreases and becomes more susceptible to vibration noise
Solution Approach 1:
The hole dimensions (diameter and length) are optimized to specific parameter ranges that balance gas diffusion speed and resonance frequency. The hole is designed with a diameter of 0.5-2.0 mm and length of 1-5 mm to achieve both adequate gas response and sufficient resonance suppression
Solution Approach 2:
The partition structure is designed to be flexible in terms of hole configuration, allowing optimization of hole size and shape to dynamically balance between gas diffusion requirements and vibration suppression needs based on specific application conditions
3Speed
If the resonance frequency of the gas measurement chamber is set low to improve gas response, then the detection speed improves, but the chamber becomes more susceptible to low-frequency vibration noise
Solution Approach 1:
The resonance frequency of the gas measurement chamber is set to a specific range (500-2000 Hz) by optimizing chamber volume and hole dimensions. This frequency range is chosen to be above typical vibration source frequencies while maintaining adequate gas diffusion response speed
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 design significantly enhances the detection accuracy of gas sensors by reducing noise interference, allowing precise measurement of target gases.
Implementation Method 1
a gas measurement unit (40) located inside the housing and demarcated by a partition (300), wherein the vibration source is located outside the gas measurement unit, the gas measurement unit includes a detector (41) located on a substrate (30), and a gas detection space (42) provided with a hole (43) through which a gas passes
Implementation Method 2
wherein a frequency f expressed by the following Formula (1) is 500 Hz or more, where V is a volume of the gas detection space, S is a cross-sectional area of the hole, L is an effective length of the hole, and c is a sound speed
Data Source
AI summary
Provided is an apparatus with a gas detection function capable of detecting a detection target gas with high accuracy. An apparatus with a gas detection function includes: a housing; a vibration source; and a gas measurement unit located inside the housing and demarcated by a partition. The vibration source is located outside the gas measurement unit. The gas measurement unit includes a detector and a gas detection space provided with a hole through which a gas passes. A sonance frequency of the gas measurement unit is 500 Hz or more.