Integrally Formed Radon Sensor Housing and Diffusion Chamber
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Solution Overview
Problem
Existing radon gas sensors face challenges in accurately measuring radon concentrations due to the diffusion of radon daughter products into the detection chamber, leading to skewed measurements and the need for bulky, power-dependent instruments for active detection or lengthy passive detection methods.
Innovation Solution
A gas sensor design featuring integrally formed diffusion chambers within the housing parts, with an overlapping structure to create a controlled diffusion path that excludes radon daughter products while allowing radon gas to enter, and a Faraday cage for electromagnetic shielding, reducing the number of components and assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If active detection using photodiode is used, then continuous measurement is achieved, but instrument size and power requirement increase
Solution Approach 1:
The patent combines the diffusion chamber and housing into a single integrally formed structure, eliminating the need for separate chamber components and reducing overall instrument size while maintaining continuous measurement capability through the photodiode detector
Solution Approach 2:
The housing structure serves multiple functions: it provides mechanical protection, forms the diffusion chamber boundary, and integrates the detector mounting, thereby reducing the number of separate components needed for continuous radon measurement
2Volume of moving object
If passive track detector is used, then instrument size is reduced and no power is needed, but measurement time increases
Solution Approach 1:
The integrally formed diffusion chamber and housing create a compact passive detector design that maintains an adequate diffusion volume for sufficient radon accumulation while keeping the overall instrument size small for domestic use
3Ease of manufacture
If diffusion chamber is separate from housing, then assembly is flexible, but number of components and assembly time increase
Solution Approach 1:
The diffusion chamber is integrally formed with the housing as a single piece, reducing the number of components that need to be assembled while maintaining the necessary diffusion volume and structural integrity
4Measurement precision
If radon daughter products diffuse into chamber, then detection sensitivity increases, but measurement accuracy decreases
Solution Approach 1:
The patent applies different properties to different regions: the diffusion chamber allows radon gas diffusion while the overlapping structure with restricted gap creates a barrier region that prevents radon daughter products from entering the detection area, thereby maintaining measurement accuracy
5Reliability
If electromagnetic shielding is added, then detector protection improves, but device complexity increases
Solution Approach 1:
The housing structure is made electrically conductive and serves dual functions: mechanical protection and electromagnetic shielding (Faraday cage), eliminating the need for separate shielding components while protecting the sensitive photodiode detector
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 enhances measurement accuracy by ensuring detected alpha particles originate from radon decays within the chamber, while minimizing instrument size and cost, and provides effective electromagnetic shielding to protect sensitive detectors.
Implementation Method 1
first and second diffusion chamber parts which mate together to form a diffusion chamber; wherein at least one of the first and second diffusion chamber parts is integrally formed with at least one of the first and second housing parts
Implementation Method 2
a Faraday cage for electromagnetic shielding, reducing the number of components and assembly time
Implementation Method 3
Radon decays by emission of an alpha particle with an energy of 5.5 MeV
Implementation Method 4
Alpha particles hitting the photodiode create a number of electron-hole pairs which will cause a small current to be generated
Data Source
AI summary
A gas sensor instrument comprises a housing formed of two parts (102, 10) and a diffusion chamber inside the housing. The diffusion chamber is formed from two parts (106, 108) and at least one of the diffusion chamber parts is formed integrally with one of the housing parts. This allows a reduction in size of the instrument without compromising the size of the diffusion chamber. Additionally, a tubular projection is formed integrally with one of the housing parts to form part of a Faraday cage for shielding an amplifier circuit of the instrument.