Ultraviolet-Sensing Sheet With Filter Layer For Accurate Dose Detection
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Solution Overview
Problem
Existing ultraviolet-sensing technologies face challenges in accurately measuring ultraviolet doses due to poor color gradation properties and susceptibility to coloring by light sources other than ultraviolet light, making it difficult to determine the cumulative dose accurately.
Innovation Solution
An ultraviolet-sensing sheet is developed with a filter layer that selectively transmits specific wavelengths and an ultraviolet-sensing layer containing a capsule with a color-forming dye and a photooxidant, which includes an organic halogen compound and a radical generator, to enhance color gradation properties and prevent false coloring by other light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a photochromic material is used in an inexpensive ultraviolet dosimeter, then the device becomes convenient to carry and inexpensive, but the material is reversibly discolored by ultraviolet light and cannot determine cumulative dose
Solution Approach 1:
The patent uses a photochromic material that undergoes irreversible color change when exposed to ultraviolet light. The color-forming dye changes from colorless to colored state permanently, allowing the cumulative dose to be determined by measuring the color intensity. This resolves the contradiction by using a photochromic material with irreversible color change properties instead of reversible ones.
2Ease of manufacture
If existing ultraviolet-sensing layers are used, then the device is inexpensive, but color gradation properties are poor and it is difficult to determine quantitativity of ultraviolet dose
Solution Approach 1:
The patent changes the chemical parameters of the ultraviolet-sensing layer by using a specific photochromic material system consisting of a color-forming dye and a photoactivator. This material system provides excellent color gradation properties and quantitative response to ultraviolet dose, resolving the contradiction between low cost and measurement precision.
3Device complexity
If existing ultraviolet-sensing layers are used, then the device is simple in structure, but the layer is likely to be colored by light other than ultraviolet light and cannot be colored accurately
Solution Approach 1:
The patent introduces a filter layer as an intermediary component between the light source and the ultraviolet-sensing layer. This filter layer selectively transmits ultraviolet light while blocking other wavelengths, ensuring that only ultraviolet light activates the photochromic material. This resolves the contradiction by adding a simple filter layer that prevents false activation by non-ultraviolet light sources.
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 allows for accurate detection of ultraviolet doses with improved color gradation properties, ensuring that the ultraviolet-sensing layer is only colored by ultraviolet light, thereby enhancing the measurement accuracy and reliability.
Implementation Method 1
a filter layer that selectively allows transmission of light having a specific wavelength
Implementation Method 2
an ultraviolet-sensing layer that includes a capsule including a color-forming dye and a photooxidant
Data Source
AI summary
Provided are an ultraviolet-sensing sheet, an ultraviolet-sensing set, and an ultraviolet-sensing method, in which color gradation properties which are suitable for detecting an ultraviolet dose are obtained and in which the coloring of an ultraviolet-sensing layer caused by the effect of light other than ultraviolet light is prevented.An ultraviolet-sensing sheet 1 includes: a filter layer 10 that selectively allows transmission of light having a specific wavelength; and an ultraviolet-sensing layer 20 that includes a capsule including a color-forming dye and a photooxidant. It is preferable that the filter layer 10 has a maximum value of the transmittance in a wavelength range of 300 nm or longer and shorter than 380 nm.