One-Piece Plastic IR Gas Analyzer Window with Hydrophobic Coating
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Solution Overview
Problem
Existing IR gas analyser windows face issues with moisture condensation, mechanical deformation, and high production costs, while requiring heating to prevent condensation, which complicates material recovery and increases power usage.
Innovation Solution
A one-piece plastic window with a central arched section and a thicker surrounding edge, made from the same material as the adapter, designed for injection moulding with a surface tension modifying substance to prevent condensation and facilitate easy mounting, using gluing, ultrasound, or heat welding for assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional gas windows are used, then IR transmission is achieved, but moisture condensation occurs on the windows
Solution Approach 1:
The patent applies hydrophobic coating to the window surface, which causes moisture to bead up and roll off rather than condense and block IR transmission. This converts the harmful condensation effect into a beneficial self-cleaning mechanism where the hydrophobic surface actively prevents moisture accumulation while maintaining optical clarity
Solution Approach 2:
The patent uses inexpensive plastic windows with hydrophobic coating instead of expensive traditional gas window materials. These windows can be easily replaced if needed, providing a cost-effective solution that eliminates condensation issues without requiring expensive materials or complex heating systems
2Object-affected harmful factors
If windows are heated to prevent condensation, then moisture deposits are eliminated, but power consumption increases and material recovery becomes difficult
Solution Approach 1:
The patent applies hydrophobic coating to the window surface, which causes moisture to bead up and roll off rather than condense and block IR transmission. This converts the harmful condensation effect into a beneficial self-cleaning mechanism where the hydrophobic surface actively prevents moisture accumulation while maintaining optical clarity
Solution Approach 2:
The patent uses inexpensive plastic windows with hydrophobic coating instead of expensive traditional gas window materials. These windows can be easily replaced if needed, providing a cost-effective solution that eliminates condensation issues without requiring expensive materials or complex heating systems
3Object-affected harmful factors
If foils are used to prevent condensation, then moisture resistance is improved, but mechanical strength decreases and additional fastening elements are required
Solution Approach 1:
The patent uses inexpensive plastic windows with hydrophobic coating instead of expensive traditional gas window materials. These windows can be easily replaced if needed, providing a cost-effective solution that eliminates condensation issues without requiring expensive materials or complex heating systems
Solution Approach 2:
The patent integrates the window directly into the adapter housing as a single molded piece, eliminating the need for separate foils and fastening elements. This merging of components maintains structural integrity while simplifying the overall design and reducing the number of parts that could fail or leak
4Object-affected harmful factors
If multiple component parts are used for the window, then condensation is prevented, but manufacturing cost increases
Solution Approach 1:
The patent integrates the window directly into the adapter housing as a single molded piece, eliminating the need for separate foils and fastening elements. This merging of components maintains structural integrity while simplifying the overall design and reducing the number of parts that could fail or leak
Solution Approach 2:
The adapter housing serves multiple functions: it provides structural support, creates the gas pathway, and incorporates the window with hydrophobic coating for condensation prevention. This multi-functionality reduces the total number of components needed and simplifies manufacturing
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 provides effective IR transmission across the desired wavelength range, prevents condensation, and is cost-effective with simplified manufacturing and easy recovery, ensuring accurate gas analysis without mechanical deformation.
Implementation Method 1
sending a beam of infrared light through a window on one side of the gas passageway and further through the gas present in said passageway
Implementation Method 2
measuring the absorption of said light at chosen wavelengths
Implementation Method 3
A surface tension modifying substance is admixed with the plastic material prior to the injection moulding process
Implementation Method 4
prevents condensation
Data Source
AI summary
A window for use in an adapter for an IR gas analyser for analysing breathing gases, where the gases flow through a through-penetrating passageway in the adapter, which includes windows disposed on opposite sides of the passageway so as to enable an IR beam to be sent through the windows and through the passageway containing said breathing gases. Each window is a one-piece structure comprised of plastic material and has a round basic shape that includes a surrounding edge and a central part which is sunken in relation to the surrounding edge and which forms the window through which the IR beams or rays shall be able to pass. A method of producing such a window, by injection moulding a thermoplastic material in a mould where injection of the plastic material is also disclosed.