UV-Sensing Sheet with Sensitivity Adjustment Layer
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Solution Overview
Problem
Existing ultraviolet-sensing sheets and films struggle to visually assess cumulative ultraviolet irradiance due to excessive color density, making them unsuitable for measuring ultraviolet doses in the range of 1 to 1,000 mJ/cm2 effectively.
Innovation Solution
An ultraviolet-sensing kit comprising a sheet or film with a layer containing capsules of photo-oxidants and leuco dyes in a specific mass ratio, along with a layer for adjusting ultraviolet sensitivity, which allows for continuous color development and easier visual assessment of cumulative illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photo-oxidant and leuco dye are used in high concentration to enable continuous color development over wide area, then measurement precision for cumulative illuminance is improved, but color density becomes excessive making visual observation difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mass ratio of photo-oxidant to leuco dye within 0.1:1 to 1.0:1, and regulating the leuco dye content at 0.01 to 1.0 g/m². These parameter optimizations enable continuous color development across wide areas while maintaining appropriate color density for visual observation, resolving the contradiction between measurement precision and excessive color density.
Solution Approach 2:
The patent introduces a layer for adjusting ultraviolet sensitivity with specific optical properties (transmittance at 300 nm ≤ 10%, transmittance at 450 nm ≥ 70%) to create local quality differentiation. This layer selectively adjusts ultraviolet transmission to control color development intensity in different regions, enabling both wide-area measurement and appropriate visual assessment.
2Adaptability or versatility
If photo-oxidant and leuco dye are used in high concentration to achieve continuous color development, then measurement range from 1 to 1,000 mJ/cm2 is covered, but visual assessment becomes difficult due to excess color density
Solution Approach 1:
The patent resolves this contradiction by optimizing the concentration parameters of photo-oxidant and leuco dye, and by introducing a layer for adjusting ultraviolet sensitivity with controlled optical properties. This enables the system to cover the wide measurement range of 1 to 1,000 mJ/cm2 while maintaining appropriate color density for visual assessment.
Solution Approach 2:
The layer for adjusting ultraviolet sensitivity acts as an intermediary between the ultraviolet irradiation and the color development process. It selectively transmits specific wavelengths (blocking 300 nm and above while allowing 450 nm and above), thereby controlling the intensity and type of ultraviolet that triggers color development, making visual assessment feasible across wide measurement ranges.
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 sensitive and visual determination of ultraviolet irradiance over a wide area, effectively measuring doses from 1 to 1,000 mJ/cm2, improving the usability of ultraviolet-sensing sheets and kits in various applications.
Implementation Method 1
the photo-oxidant generates radicals in an amount in proportion to an increase in ultraviolet dose so as to sense ultraviolet radiation with high gradation property
Data Source
AI summary
Provided an ultraviolet-sensing sheet that facilitates measurement of ultraviolet irradiance over a wide area, that is suitable in ultraviolet irradiance in a range from 1 to 1,000 mJ/cm2, and that is easier to visually assess for coloring on the cumulative illuminance of ultraviolet, an ultraviolet-sensing kit, and a method for sensing ultraviolet.The ultraviolet-sensing kit comprises a sheet containing an ultraviolet-sensing layer and a film for adjusting ultraviolet-sensitivity, wherein the sheet containing an ultraviolet-sensing layer comprising, a support and an ultraviolet-sensing layer in this order, the ultraviolet-sensing layer comprising a capsule containing a photo-oxidant and a capable of developing color by the photo-oxidant, a mass ratio of the photo-oxidant and the leuco dye is 0.2 to 1.0:1, and the leuco dye being present in an amount of 0.1 to 1.0 g per 1 m2 of a surface area of the ultraviolet-sensing layer.