Ellipsoidal Mirror Optical Chamber for Gas Detection
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Solution Overview
Problem
Existing gas detection devices, particularly non-dispersive infrared (NDIR) devices, face challenges in achieving high sensitivity without increasing bulk and are sensitive to relative movements of the radiation source and detector, affecting precision.
Innovation Solution
An optical chamber with a series of adjacent mirrors, each with two focal points, arranged in a zig-zag configuration to redirect radiation from the source to the detector, minimizing bulk and insensitivity to source-detector movement, using truncated ellipsoid mirrors and a two-portion chamber design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical guide is used to lengthen the optical path, then sensitivity is improved, but positioning precision is worsened and device complexity increases
Solution Approach 1:
The patent uses ellipsoidal mirrors with specific focal point geometries to redirect light beams. The curved surfaces of the ellipsoidal mirrors naturally focus and redirect radiation along a defined optical path, eliminating the need for precise positioning of linear optical guides while achieving the required sensitivity through multiple reflections.
2Measurement precision
If the optical path is lengthened to increase sensitivity, then measurement precision is improved, but device volume increases
Solution Approach 1:
The patent employs multiple ellipsoidal mirrors arranged in three-dimensional space to create a zigzag optical path. By utilizing vertical and lateral dimensions for light redirection, the optical path length is significantly extended within a compact chamber volume, achieving high sensitivity without increasing the overall device footprint.
Solution Approach 2:
The optical chamber contains multiple nested reflections where light beams bounce between successive mirrors (M1, M1', M2, M2', etc.), effectively nesting multiple optical path segments within a single compact chamber. This allows the optical path to be lengthened without proportionally increasing the chamber volume.
3Device complexity
If a single series of mirrors is used, then device complexity is reduced, but optical path control is worsened
Solution Approach 1:
The patent divides the mirror system into two distinct series: a first series of ellipsoidal mirrors (M1, M2, M3, ...) and a second series of ellipsoidal mirrors (M1', M2', M3', ...). This segmentation allows independent optimization of each mirror series while maintaining a systematic overall structure, improving optical path control without excessive complexity.
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 a compact, precise gas detection device with increased sensitivity and reduced sensitivity to source-detector movement, while maintaining a long optical path and low power consumption.
Implementation Method 1
reflecting means for reflecting radiation issued from a radiation source and for redirecting said radiation toward a radiation detector
Implementation Method 2
a mirror M'i of the second series is arranged to focus the radiation on a mirror Mi of the first series
Data Source
AI summary
An optical chamber for a gas detection device, which includes reflecting device for reflecting radiation issued from a radiation source and for redirecting the radiation toward a radiation detector, the reflecting device including a first series of adjacent mirrors and a second series of adjacent mirrors. The mirrors of the first series and the mirrors of the second series are of the truncated ellipsoid of revolution type. The first series of mirrors and the second series of mirrors are arranged relative to each other so that the radiation emitted by the radiation source is reflected alternatively by a mirror of the second series and by a mirror of the first series and defines an optical path extending from the radiation source to the radiation detector.