Retro-Reflective Disc Target Coating for Accurate NIR Tracking
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Solution Overview
Problem
Traditional disc targets for optical tracking systems suffer from inaccuracies due to direct light reflection from the top-encapsulating layer and contrast with the disc border, particularly with NIR light, which affects tracking accuracy.
Innovation Solution
A retro-reflective marker with a layered configuration comprising a bare retro-reflective layer, a protective layer with a NIR absorbent coating, and a border with an NIR absorbent coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional encapsulated retro-reflective tape is used to achieve wipeability, then contaminant resistance is improved, but tracking accuracy deteriorates due to direct light reflection and border contrast
Solution Approach 1:
The retro-reflective marker is divided into distinct functional layers: an exposed retro-reflective bead layer for primary reflection, a separate protective layer with anti-reflective coating for eliminating direct reflections, and a border with NIR absorbent coating for reducing border contrast. This segmentation allows each layer to optimize its specific function without compromising overall tracking accuracy.
Solution Approach 2:
A protective layer with anti-reflective coating is introduced as an intermediary between the retro-reflective beads and the external environment. This intermediary layer eliminates direct light reflections while preserving the retro-reflective properties of the beads, thereby maintaining tracking accuracy while providing protective functionality.
2Ease of operation
If encapsulated retro-reflective tape is used, then wipeability is improved, but tracking accuracy deteriorates due to direct light reflection from the top layer
Solution Approach 1:
The anti-reflective property is extracted and placed in a separate protective layer rather than being integrated into the encapsulating material itself. This allows the protective layer to be optimized for both anti-reflection and wipeability, while the retro-reflective beads remain exposed for optimal tracking performance.
Solution Approach 2:
The marker uses composite material structure combining retro-reflective beads, anti-reflective coating material, and NIR absorbent border material. Each material is selected and positioned to perform its specific function, creating a composite structure that achieves both wipeability and high tracking accuracy by eliminating direct reflections.
3Ease of manufacture
If common bordering material like plastic or anodized aluminum is used, then manufacturing ease is improved, but tracking accuracy deteriorates due to NIR light reflection
Solution Approach 1:
The border material's optical parameters are changed by applying an NIR absorbent coating. This coating modifies the border's reflectivity characteristics in the NIR spectrum, preventing NIR light reflection that would otherwise interfere with tracking accuracy, while the underlying plastic or metal substrate maintains manufacturing ease.
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 efficacy of the retro-reflective system is enhanced by using a retro-reflective marker with a layered configuration comprising a bare retro-reflective marker with a layered configuration.
Implementation Method 1
passive retro-reflective markers configured to reflect an optical signal to the tracking object in a retro-reflective manner
Implementation Method 2
border with an NIR absorbent coating
Data Source
AI summary
A retro-reflective marker comprising a bare retro-reflective layer; a protective layer with a near-infrared (NIR) wavelength specific anti-reflective coating; and a border with an NIR absorbent coating.