Optical Filter Infrared Polarization Segmentation
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Solution Overview
Problem
Existing optical filters fail to effectively transmit specific infrared wavelengths while blocking visible light and maintaining polarization states at varying angles of incidence, leading to inefficiencies in optical systems.
Innovation Solution
An optical filter comprising a polarizer and a visible light blocking filter, configured to transmit at least 60% of light in a first infrared wavelength range in a specific polarization state, while blocking more than 70% of light in orthogonal and angled polarization states, with the visible light blocking filter transmitting less than 30% of unpolarized visible light and at least 60% of infrared light in the first polarization state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional optical filter is used to block visible light, then visible light transmission is reduced, but infrared light transmission and polarization maintenance at varying angles are insufficient
Solution Approach 1:
The optical filter is divided into two distinct functional layers: a visible light blocking filter and a polarizer. The visible light blocking filter specifically targets and blocks visible wavelengths, while the polarizer layer handles polarization selection for infrared light. This segmentation allows each layer to optimize its specific function without compromising the other, resolving the contradiction between blocking visible light and maintaining infrared transmission with polarization.
Solution Approach 2:
The optical filter combines two different filter technologies into a composite structure: a visible light blocking filter (using appropriate blocking materials) and a polarizer (using polarizing materials). This composite approach enables simultaneous achievement of visible light blocking and infrared light transmission with polarization maintenance, as each material contributes its specific optical properties to the overall system.
2Manufacturing precision
If a polarizer is used to transmit specific polarization states, then polarization selectivity is improved, but transmission efficiency at varying angles of incidence deteriorates
Solution Approach 1:
The polarizer layer is designed to perform multiple functions: it maintains high polarization selectivity for infrared light while simultaneously achieving broad angular acceptance. By optimizing the polarizer's optical properties and positioning it in combination with the visible light blocking filter, the system achieves both polarization precision and angular versatility, allowing efficient transmission across varying angles of incidence.
3Object-affected harmful factors
If a visible light blocking filter is used to block visible wavelengths, then visible light blocking is improved, but infrared light transmission and polarization maintenance worsen
Solution Approach 1:
The optical filter is divided into two distinct functional layers: a visible light blocking filter and a polarizer. The visible light blocking filter specifically targets and blocks visible wavelengths, while the polarizer layer handles polarization selection for infrared light. This segmentation allows each layer to optimize its specific function without compromising the other, resolving the contradiction between blocking visible light and maintaining infrared transmission with polarization.
Solution Approach 2:
The optical filter combines two different filter technologies into a composite structure: a visible light blocking filter (using appropriate blocking materials) and a polarizer (using polarizing materials). This composite approach enables simultaneous achievement of visible light blocking and infrared light transmission with polarization maintenance, as each material contributes its specific optical properties to the overall system.
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 efficient transmission of desired infrared wavelengths while significantly blocking visible light and maintaining polarization, enhancing the performance of optical systems by optimizing light transmission and blocking across different incidence angles.
Implementation Method 1
The polarizer is configured to transmit at least 60 percent of light in a first infrared wavelength range that is incident on the polarizer at normal incidence in a first polarization state. The polarizer is further configured to transmit less than 30 percent of light in a second infrared wavelength that is incident on the polarizer at normal incidence in a second polarization state orthogonal to the first polarization state
Implementation Method 2
The visible light blocking filter is configured to transmit less than 30 percent of unpolarized light in a first visible wavelength range that is incident on the visible light blocking filter at normal incidence. The visible light blocking filter is configured to transmit at least 60 percent of light in the first infrared wavelength range
Data Source
AI summary
An optical filter including a polarizer and a visible light blocking filter is described. The polarizer is configured to transmit at least 60 percent of light in a first infrared wavelength range that is incident on the polarizer at normal incidence in a first polarization state, to transmit less than 30 percent of light in a second infrared wavelength that is incident on the polarizer at normal incidence in a second polarization state orthogonal to the first polarization state, and to transmit less than 30 percent of light in a third infrared wavelength range that is incident on the polarizer with a 50 degree angle of incidence in the second polarization state. The visible light blocking filter configured to transmit at least 60 percent of light in the first infrared wavelength range at normal incidence in the first polarization state.