NDIR Sensor Reflective Diffuser for Mechanical Stability
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Solution Overview
Problem
Conventional non-dispersive infrared (NDIR) gas sensors are sensitive to mechanical changes, such as temperature fluctuations, which affects signal reliability and requires expensive precision components or lengthy burn-in periods for stabilization.
Innovation Solution
Incorporating a reflective diffuser with a textured surface into the waveguide of the NDIR gas sensor to induce scattering of the infrared signal, reducing mechanical sensitivity and enhancing stability by averaging signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a smooth reflective surface is used in the waveguide to minimize scattering and maximize signal, then the signal intensity is improved, but the sensor becomes sensitive to mechanical changes and temperature fluctuations
Solution Approach 1:
The patent applies a reflective diffuser with a textured surface at specific locations within the waveguide rather than using a uniformly smooth surface throughout. This local modification creates zones of controlled scattering that reduce mechanical sensitivity while preserving overall signal intensity through strategic placement of the diffuser elements.
Solution Approach 2:
The patent converts the harmful effect of scattering (which normally reduces signal intensity) into a beneficial mechanism for reducing mechanical sensitivity. By intentionally introducing controlled scattering through the textured reflective diffuser, the system achieves mechanical stability while maintaining acceptable signal levels through the reflective coating.
2Reliability
If precision components and burn-in periods are used to stabilize the sensor, then the mechanical stability is improved, but the cost and time required are increased
Solution Approach 1:
The patent employs a reflective diffuser that can be integrated into the waveguide as a simple, cost-effective component rather than requiring expensive precision components. The textured surface structure provides mechanical stability through its geometric design rather than through costly materials or complex assembly procedures.
Solution Approach 2:
The patent changes the surface parameters of the waveguide by introducing a textured pattern with specific dimensional characteristics. This parameter modification (surface texture geometry) provides mechanical stability without requiring changes to the electronic components or extended burn-in periods, thereby reducing overall system complexity and cost.
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 increased mechanical stability and accuracy with reduced sensitivity to mechanical changes, allowing for tighter accuracy specifications at lower costs without the need for expensive components or lengthy stabilization processes.
Implementation Method 1
scattering the infrared signal off of a reflective diffuser
Implementation Method 2
a reflective diffuser with a textured surface and a reflective coating thereon
Data Source
AI summary
The present application provides a non-dispersive infrared gas sensor. The non-dispersive infrared gas sensor may include an infrared source, an infrared detector, and a waveguide extending about the infrared source and the infrared detector. The waveguide may include a reflective diffuser thereon.