Optical Filter Wavelength Selective Layer for Near-Infrared Camouflage
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Solution Overview
Problem
Ambient sources of electromagnetic radiation, particularly visible wavelengths, interfere with light receivers and emitters designed for near-infrared wavelengths, causing noise and visibility issues, as existing solutions for camouflage often block or reduce desired near-infrared transmission.
Innovation Solution
Incorporating wavelength transmission selective layers with an absorber component that reduces the transmission of wavelengths from 701 nm to 849 nm, allowing near-infrared wavelengths to pass through while scattering or absorbing visible wavelengths, thereby shielding light receivers and camouflaging light emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If wavelength transmission selective layers with absorber component are used to reduce transmission of 701-849 nm wavelengths, then interference from visible wavelengths is prevented, but the device complexity increases
Solution Approach 1:
An optical filter comprising a wavelength transmission selective layer with an absorber component is introduced as an intermediary element between the light receiver and the ambient environment. This filter selectively transmits near-infrared wavelengths (850-1050 nm) while absorbing visible wavelengths (701-849 nm), thereby mediating the interference problem without requiring complex active shielding or filtering systems
Solution Approach 2:
The optical properties of the wavelength transmission selective layer are specifically engineered by changing parameters such as the absorber component concentration, layer thickness, and material composition to achieve selective transmission in the 850-1050 nm range while blocking 701-849 nm wavelengths. This parameter optimization allows the filter to provide the desired wavelength selectivity with a single passive layer rather than multiple active components
2Object-affected harmful factors
If existing camouflage solutions are used to conceal light emitters, then visibility is reduced, but near-infrared transmission is blocked or reduced
Solution Approach 1:
The wavelength transmission selective layer exhibits different optical properties at different wavelength ranges: it appears opaque or translucent in the visible range (701-849 nm) to provide camouflage, while simultaneously maintaining high transmission (greater than 50%) in the near-infrared range (850-1050 nm). This local quality differentiation allows the filter to conceal the light emitter from visible perception while ensuring reliable near-infrared signal transmission
Solution Approach 2:
The optical filter utilizes a composite structure combining a wavelength transmission selective layer with specific absorber components that exhibit selective absorption characteristics. This composite material approach enables the filter to simultaneously achieve visible wavelength absorption and near-infrared wavelength transmission, resolving the contradiction between camouflage and signal transmission reliability
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 effectively prevents interference from visible wavelengths, allowing high clarity near-infrared transmission and concealing light emitters from visible perception without obstructing desired wavelengths, enhancing the performance and stealth of optical systems.
Implementation Method 1
the wavelength transmission selective layer at least partially reduces the transmission of wavelengths from 701 nm to 849 nm incident thereon, wherein the wavelength transmission selective layer includes an absorber component
Implementation Method 2
allowing near-infrared wavelengths to pass through while scattering or absorbing visible wavelengths
Data Source
AI summary
Systems including one or both of a light emitter or a light receiver or a detectable object; and an optical filter adjacent one or both of the light emitter or the light receiver, wherein the optical filter includes at least one wavelength transmission selective layer an absorber component, wherein the wavelength transmission selective layer at least partially reduces the transmission of wavelengths from 701 nm to 849 nm incident thereon.