Sensor Window Multilayer Coating for Near-Infrared Transmissivity
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Solution Overview
Problem
Conventional optical systems face challenges in hiding sensor components from view while maintaining effective sensing capabilities, as tinted glass or colored pigments often require excessive thickness, reduce light transmission, and lack sharp transitions between opaqueness in visible and transmissivity in sensing wavelengths, compromising system performance and aesthetics.
Innovation Solution
A sensor window with alternating high and low refractive index layers is configured to be transmissive in sensing wavelengths and opaque in visible light, allowing for color-selective integration with minimal thickness and a sharp transition between transmissivity and opaqueness, thereby enhancing the performance and aesthetics of optical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tinted glass or colored pigments are used to hide sensor components, then the aesthetic appeal and visibility control are improved, but the thickness increases excessively and light transmission is reduced
Solution Approach 1:
The patent uses a composite multilayer structure consisting of alternating high refractive index and low refractive index dielectric layers. This composite material approach enables the window to achieve both aesthetic color matching and functional optical properties (high transmissivity in sensing wavelengths) without requiring excessive thickness, thereby resolving the contradiction between visibility control and thickness.
Solution Approach 2:
The patent changes the optical parameters by using alternating layers with different refractive indices (high and low) to create constructive and destructive interference patterns. This parameter change enables sharp transitions between transmissivity and opaqueness at specific wavelengths, achieving effective hiding at visible wavelengths while maintaining high transmissivity in sensing wavelengths without increasing thickness.
2Ease of manufacture
If tinted glass or colored pigments are used to hide sensor components, then the aesthetic appeal is improved, but the transmissivity in sensing wavelengths is reduced
Solution Approach 1:
The patent applies local quality by designing the multilayer structure to have different optical properties at different wavelength ranges. The window exhibits high reflectivity (opaqueness) in the visible spectral range for aesthetic purposes, while simultaneously maintaining high transmissivity in the sensing wavelength range (e.g., near-infrared), thereby allowing effective sensing without compromising aesthetic appeal.
Solution Approach 2:
The alternating high and low refractive index dielectric layers create a composite material system that selectively reflects visible light while transmitting sensing wavelengths. This composite structure enables the window to serve dual functions: aesthetic hiding in visible range and effective light transmission in sensing range, resolving the contradiction between aesthetic appeal and light transmission.
3Reliability
If conventional filtering methods are used, then the transition between opaqueness and transmissivity is achieved, but the transition is not sharp enough, compromising system performance
Solution Approach 1:
The patent transitions from conventional single-layer or simple gradient filtering to a multilayer dielectric structure, adding the dimension of layer stacking. This dimensional change enables sharp transitions between transmissivity and opaqueness by creating multiple interfaces for optical interference, thereby significantly improving transition sharpness and system performance.
Solution Approach 2:
The alternating high and low refractive index layers form a composite dielectric stack that produces sharp optical transitions through constructive and destructive interference. This composite structure creates well-defined passbands and stopbands, achieving sharp transitions between transmissive and opaque states, which directly improves system performance by reducing ambient light interference while maintaining sensing capability.
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 enables effective sensing while hiding the sensor components from view, improving both the functionality and aesthetic appeal of optical systems by ensuring high transmissivity in sensing wavelengths and opacity in visible light with a reduced thickness and sharper transition, compared to traditional methods.
Implementation Method 1
A sensor window with alternating high and low refractive index layers is configured to be transmissive in sensing wavelengths and opaque in visible light
Implementation Method 2
The set of layers may include a first subset of layers of a first refractive index and a second set of layers of a second refractive index different from the first refractive index
Data Source
AI summary
A sensor window may include a substrate and a set of layers disposed onto the substrate. The set of layers may include a first subset of layers of a first refractive index and a second set of layers of a second refractive index different from the first refractive index. The set of layers may be associated with a threshold transmissivity in a sensing spectral range. The set of layers may be configured to a particular color in a visible spectral range and may be associated with a threshold opacity in the visible spectral range.