Polarization-Modulated Optical Path for Convergence-Accommodation Matching
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Solution Overview
Problem
Existing optical systems fail to efficiently remove elemental mercury (Hg0) from flue gas and oxidized mercury (Hg2+) from waste liquid, with activated carbon injection technology being costly and its mercury removal efficiency is affected by NOx and SO2.
Innovation Solution
The use of metal sulfides (e.g., FeS2, CuS, CuS, CuS, and CuS) as mercury removal adsorbents, which contact with the flue gas and waste liquid, adsorbing and converting Hg0 from flue gas and Hg2+ from waste liquid into stable mercury sulfide compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display element is moved in the optical axis direction to adjust convergence and accommodation, then the convergence angle and diopter can coincide, but the size of the device increases
Solution Approach 1:
The patent changes the optical parameters of existing components (display element, optical path, eye lens) through polarization modulation and optical path length variation, rather than physically moving components. This achieves convergence-accommodation matching by altering light properties (polarization state and optical path length) instead of mechanical displacement, thereby avoiding device size increase while maintaining the ability to adjust virtual image position
Solution Approach 2:
The patent replaces the mechanical moving system (physically displacing the display element along the optical axis) with an optical control system using polarization modulation and variable optical path length. This substitution eliminates the need for mechanical movement while achieving the same functional result of adjusting virtual image position to match convergence and accommodation
2Object-generated harmful factors
If activated carbon injection technology is used for mercury removal, then some mercury can be removed, but the removal efficiency is affected by NOx and SO2 and operational costs are high
Solution Approach 1:
The patent uses inexpensive metal sulfide materials (such as iron sulfide, copper sulfide, zinc sulfide, or their mixtures) as adsorbents instead of expensive activated carbon. These materials can be directly injected into the flue gas stream and provide effective mercury removal without being affected by NOx and SO2, offering a cost-effective and operationally simple solution
Solution Approach 2:
The patent changes the chemical composition of the adsorbent from carbon-based materials to metal sulfide materials. This parameter change fundamentally alters the chemical interaction mechanism, making the adsorbent insensitive to interference from NOx and SO2 while maintaining high mercury removal efficiency and reducing operational costs
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
Achieves efficient, cost-effective, and environmentally friendly simultaneous removal of Hg0 from flue gas and Hg2+ from waste liquid, avoiding secondary pollution and reducing operational costs.
Implementation Method 1
the optical path portion is configured such that an optical path length of the light passing through the optical path portion varies depending on a polarization direction when the light is incident on the optical path portion
Data Source
AI summary
An optical system forming an image of light from a display element includes a modulation unit individually polarization-modulating light from each portion of the display element so that the light from each portion of the display element becomes any polarized light of a plurality of polarized light beams having different polarization directions, and an optical path portion through which the light polarization-modulated by the modulation unit passes, in which the optical path portion is configured such that an optical path length of the light passing through the optical path portion varies depending on a polarization direction when the light is incident on the optical path portion.