Formaldehyde Detector with Integrated Color Indicator
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Solution Overview
Problem
Existing formaldehyde detecting devices require a colorimetric chart to determine formaldehyde concentration, which is inconvenient for use.
Innovation Solution
A formaldehyde detecting device with a formaldehyde detecting unit that includes a formaldehyde detecting layer, a diffusion restricting member, and a concentration indicator, allowing direct determination of formaldehyde concentration based on color change without a colorimetric chart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a colorimetric chart is used to determine formaldehyde concentration, then measurement capability is provided, but ease of operation deteriorates due to the need for additional reference materials
Solution Approach 1:
The patent combines the colorimetric chart function directly onto the detecting paper by incorporating a concentration indicator layer that displays reference color gradients corresponding to different formaldehyde concentrations. This merging eliminates the need for separate reference materials, allowing users to determine concentration by comparing the color change on the detecting surface directly with the integrated indicator, thus improving ease of operation while maintaining measurement precision
Solution Approach 2:
The patent introduces a concentration indicator as an intermediary element that mediates between the formaldehyde detection reaction and the user's visual assessment. The indicator layer provides reference color patterns that facilitate direct comparison with the detected color change, serving as a built-in reference system that eliminates the need for external colorimetric charts and simplifies the determination process
2Measurement precision
If formaldehyde detecting material is applied on the entire surface, then detection sensitivity is improved, but manufacturing precision deteriorates due to difficulty in controlling uniform color development
Solution Approach 1:
The patent segments the detecting surface into distinct functional zones: a formaldehyde detecting surface with detecting material for sensitive detection, and a concentration indicator layer with reference color patterns for measurement. This segmentation allows each zone to perform its specific function optimally - the detecting surface provides high sensitivity while the indicator provides uniform reference patterns, resolving the conflict between detection sensitivity and manufacturing uniformity
Solution Approach 2:
The patent applies different material compositions and properties to different regions of the detecting device. The formaldehyde detecting surface uses highly sensitive detecting material optimized for reaction with formaldehyde, while the concentration indicator layer uses materials optimized for producing uniform, stable reference color patterns. This local differentiation of material properties allows each region to excel at its specific function without compromising the other
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
Enables efficient and direct determination of formaldehyde concentration through color change on the formaldehyde detecting surface, eliminating the need for a colorimetric chart.
Implementation Method 1
a formaldehyde detecting material that is applied on the formaldehyde detecting surface and that develops color when reacting with formaldehyde
Implementation Method 2
The diffusion restricting member is configured to permit a restricted amount of formaldehyde to pass therethrough to react with the formaldehyde detecting material
Data Source
AI summary
A formaldehyde detecting device includes a formaldehyde detecting unit which includes a formaldehyde detecting layer, a diffusion restricting member and a concentration indicator. The formaldehyde detecting layer includes a formaldehyde detecting material that develops color when reacting with formaldehyde. The diffusion restricting member is disposed on the formaldehyde detecting layer and permits a restricted amount of formaldehyde to pass therethrough to react with the formaldehyde detecting material. Concentration of formaldehyde is determined based on a color change on the formaldehyde detecting layer, and is indicated by the concentration indicator.