Discrete Colorimetric Gas Detector Zones
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Solution Overview
Problem
Existing gas detectors using paper tapes with color-change materials face issues such as inaccuracies due to evolved gases, degradation over time, inconsistencies, and interference from non-target gases, leading to potential false alarms and limited shelf life.
Innovation Solution
A colorimetric gas detector with a substrate featuring discrete areas of different color-change materials, allowing for varied concentrations and simultaneous detection of multiple gases, with inkjet printing enabling precise dosing and reduced material usage, and allowing for calibration and visible indication of material deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If continuous paper tape impregnated with color-change material is used, then a permanent visual record of gas responses is obtained, but the material degrades over time due to temperature, humidity and light exposure
Solution Approach 1:
The continuous paper tape is divided into discrete detection elements or zones, each containing color-change material. This segmentation allows individual elements to be used and replaced independently, reducing the impact of degradation on overall system reliability. Fresh segments can be introduced without wasting degraded portions of the tape.
Solution Approach 2:
Multiple discrete detection elements are prepared in advance with controlled amounts of color-change material, allowing selection of elements with optimal freshness and performance characteristics for each measurement task, rather than using a continuous tape that degrades uniformly over time.
2Manufacturing precision
If uniform color-change material is applied across the entire tape, then consistent response is achieved, but material usage is excessive and drying time is prolonged
Solution Approach 1:
Color-change material is applied only to specific discrete areas or zones on the substrate rather than uniformly across the entire surface. This localized application reduces the total amount of material required and consequently shortens the drying time, while maintaining sufficient material in each discrete area to ensure consistent and reliable detection responses.
3Adaptability or versatility
If discrete areas with different material doses are used, then a wider range of gas concentrations can be detected, but device complexity increases
Solution Approach 1:
Different discrete areas on the substrate are assigned different doses or concentrations of color-change material, allowing each area to be optimized for detecting specific ranges of gas concentrations. Low-dose areas detect low concentrations while high-dose areas detect high concentrations, expanding the overall detection range without requiring multiple separate devices.
Solution Approach 2:
A single substrate integrates multiple discrete detection areas with varying material doses, enabling one device to perform multiple detection functions across a wide concentration range. This multi-functional design eliminates the need for separate detectors for different concentration levels, reducing overall system complexity despite the varied internal structure.
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
This solution enhances accuracy by distinguishing between gas concentrations and types, reduces material usage and drying time, and extends shelf life, while enabling users to prepare detectors locally, thus minimizing stockholding and degradation.
Implementation Method 1
the material is chosen to react with the target gas and to change colour. The degree of colour change is a measure of the concentration of the target gas in the atmosphere being monitored.
Implementation Method 2
The analyser detects the change of colour and calculates the gas concentration by comparison to a table of known gas responses that has been pre-programmed into the analyser.
Implementation Method 3
The sheet is then dried and installed in a cassette... with inkjet printing enabling precise dosing and reduced material usage
Data Source
AI summary
The present invention provides a colorimetric gas detector comprising a substrate bearing a material that can react with a gas in an atmosphere being monitored and wherein the reaction causes the material to change the radiation at which the material absorbs or radiates radiation (the color-change material). The material is located in at least one discrete area of the substrate. By providing the color change material in discrete areas, the amount of such material can be reduced and different types of color-change material can be included on a common substrate to detect two or more gases simultaneously.