Polyhedral Ionization Chamber for Radon Sensor Mounting and Noise
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Solution Overview
Problem
Cylindrical radon sensors face challenges with mountability, electromagnetic noise resistance, electrical leakage, and interference from thoron (Rn-220) due to their structure, which affects measurement efficiency and safety.
Innovation Solution
A radon sensor device using a polyhedral-shaped ionization chamber with a conductive inner surface, a cover with a conductive layer, and a T-shaped probe unit, along with an electromagnetic wave-protective cap, to enhance mountability, resist electromagnetic noise, and exclude thoron interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cylindrical structure with pores is used for the ionization chamber, then measurement efficiency is improved due to uniform electrical field distribution, but electromagnetic noise resistance deteriorates and mountability becomes difficult
Solution Approach 1:
The patent changes the ionization chamber from a cylindrical symmetric structure to a polyhedral asymmetric structure (specifically a regular tetrahedron, octahedron, or icosahedron). This asymmetric polyhedral shape with flat surfaces inherently provides better electromagnetic noise resistance while maintaining effective radon measurement capability, resolving the contradiction between measurement efficiency and electromagnetic noise resistance.
2Measurement precision
If a cylindrical structure with pores is used for the ionization chamber, then measurement efficiency is improved, but ease of manufacture deteriorates due to mounting difficulties
Solution Approach 1:
The polyhedral shape with flat surfaces and sharp edges provides natural mounting surfaces and alignment features that are easier to manufacture and assemble compared to cylindrical structures. The flat faces of the polyhedron can be directly mounted to circuit boards or housing structures without requiring additional mounting brackets or complex assembly procedures.
3Measurement precision
If high-voltage bias is completely exposed in the cylindrical structure, then electrical field intensity is improved for measurement, but reliability deteriorates due to electrical leakage and shock hazards
Solution Approach 1:
The patent implements a nested protective structure where the ionization chamber is enclosed within a housing that contains the high-voltage bias components. The probe unit penetrates through the housing in a controlled manner with proper insulation and sealing, nesting the high-voltage elements within protective layers. This nested arrangement maintains the necessary electrical field intensity for measurement while preventing electrical leakage and shock hazards.
4Productivity
If pores are used in the cylindrical ionization chamber, then air flow is improved for radon intake, but reliability deteriorates due to thoron interference
Solution Approach 1:
The polyhedral shape changes the air flow patterns and diffusion characteristics compared to cylindrical structures. The flat surfaces and geometric configuration of the polyhedron create different flow dynamics that can reduce the rapid influx of thoron while still allowing adequate radon intake, thereby improving measurement reliability by reducing thoron interference.
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 polyhedral-shaped design improves assembly, reduces electromagnetic noise interference, prevents electrical leakage, and enhances measurement efficiency while effectively excluding thoron (Rn-220) interference, making it suitable for mass production and safe operation.
Implementation Method 1
an ionization chamber having an open side and inner sides surrounded by a first conductor and generating an electrical field therein by applying bias power to the first conductor
Implementation Method 2
a probe unit disposed in the ionization chamber and absorbing ion charges produced when alpha (α) decay occurs in the ionization chamber
Data Source
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AI summary
A radon sensor device using a polyhedral-shaped ionization chamber is proposed. The radon sensor device includes: an ionization chamber having an open side and inner sides surrounded by a first conductor and generating an electrical field therein by applying bias power to the first conductor; a cover having a first side covered with a second conductor and closing the open side of the ionization chamber such that that first conductor disposed on the inner sides of the ionization chamber and the second conductor are electrically connected; a probe unit disposed in the ionization chamber and absorbing ion charges produced when alpha (α) decay occurs in the ionization chamber; and a measurement circuit detecting an alpha particle detection signal by amplifying and processing an electrical micro-signal input from the probe unit into a predetermined magnitude.