Optical Stop Geometry for Stray Light Control
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Solution Overview
Problem
Existing optical sample detection systems face precision issues due to stray light interference caused by obstructed light beams and optical stops, which affect the measurement results and analysis accuracy.
Innovation Solution
An optical sample detection system with a convergence projection component featuring an optical stop with internal surfaces where the included angles between normals and the optical axis are greater than 90°, controlling the shape of the optical stop to limit light spot size and deflect stray light, thereby reducing its impact on the detection result.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an optical stop structure with aperture is employed to control light spot size, then the light spot size satisfies use requirements, but part of light beams are obstructed and reflected light rays act as stray light influencing measurement results
Solution Approach 1:
The patent converts the harmful reflected light rays (stray light) into a beneficial effect by designing the optical stop's internal surface with a specific geometric structure. The reflected light rays are redirected to fall onto the light absorbing component rather than entering the detection system, transforming the harmful reflection into a useful stray light control mechanism that improves measurement precision while maintaining light spot size control
2Ease of operation
If conventional optical stop structures are used, then light beam obstruction is achieved, but stray light is generated and influences detection results
Solution Approach 1:
The patent applies a curved geometric structure to the internal surface of the optical stop, specifically designing it with a predetermined curvature radius. This curved surface redirects reflected light rays away from the detection path, effectively controlling stray light while maintaining ease of light beam operation. The curvature transforms straight reflected rays into redirected paths that fall onto the light absorbing component
3Manufacturing precision
If optical stop obstructs light beams to limit light spot size, then measurement accuracy is improved, but reflected light rays create stray light affecting detection
Solution Approach 1:
The patent introduces a light absorbing component as an intermediary element to capture the reflected light rays from the optical stop. The curved internal surface of the optical stop directs stray light onto this intermediary component, which then absorbs the harmful reflected rays, preventing them from entering the detection system while allowing the main light beam to pass through for accurate light spot size measurement
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 approach effectively minimizes stray light influence, enhancing sample analysis precision and reducing costs by controlling the direction and reflection of stray light, ensuring accurate detection results.
Implementation Method 1
included angles between directions of at least a part of the normals and a direction of an optical axis of the optical system are larger than 90°
Data Source
AI summary
An optical sample detection system is provided, including a light source; a convergence projection component for converging light rays emitted by the light source; a sample accommodation component for accommodating a detected sample; a light beam collection component for receiving light rays carrying sample characteristic information and transmitted from the sample accommodation component; a light splitting component for splitting polychromatic lights collected by the light beam collection component into independent spectrums or spectral bands; and a photoelectric detection component for receiving optical signals of different wavelengths separated through the light splitting component.