Uranine Reference Standard for Water Detection Calibration
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Solution Overview
Problem
Existing water detection units face challenges in calibration due to the instability and differing emittance curves of conventional reference standards, leading to inaccurate readings, especially with modern detection units that are sensitive to wavelength variations.
Innovation Solution
A kit and method for manufacturing a reference standard using an absorbent polymeric substrate saturated with a uranine solution, which is then dried and sealed within a transparent film, ensuring a stable emittance curve comparable to uranine, thereby providing a reliable calibration for water detection units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional reference standards (inorganic substances or unstable organic substances) are used, then manufacturing is simpler, but the emittance curve stability and wavelength match with uranine deteriorate
Solution Approach 1:
The patent changes the chemical composition parameter of the reference standard from conventional inorganic substances or unstable organic substances to a stable organic fluorescent substance with specific properties. This substance is saturated into the absorbent filter pad at controlled concentrations, creating a reference standard that matches the emittance curve of uranine while maintaining long-term stability and reproducibility.
Solution Approach 2:
The reference standard is constructed as a composite material combining a stable organic fluorescent substance with an absorbent filter pad matrix. This composite structure allows the fluorescent substance to be uniformly distributed and retained within the pad, ensuring consistent emittance characteristics that match uranine while providing mechanical stability and reproducibility.
2Ease of manufacture
If inorganic materials with different emittance curves are used, then manufacturing is easier, but measurement precision deteriorates due to wavelength sensitivity of modern detection units
Solution Approach 1:
The patent modifies the emittance curve parameter by selecting a stable organic fluorescent substance whose emission spectrum closely matches that of uranine. This ensures that modern detection units, which are highly sensitive to wavelength variations, will accurately compare the reference standard against test pads containing uranine, thereby maintaining calibration precision.
Solution Approach 2:
The reference standard uses a fluorescent substance with homogeneous emittance characteristics similar to uranine across the relevant wavelength range. This homogeneity ensures that the detection unit's sensitive wavelength-dependent measurements remain accurate when calibrating with the reference standard.
3Illumination intensity
If reference standards with high persistence fluorescence are used, then initial emittance intensity is higher, but time resolution deteriorates due to residual emittance interfering with subsequent readings
Solution Approach 1:
The patent adjusts the persistence parameter of the fluorescent substance by selecting a stable organic compound with optimized fluorescence decay characteristics. This substance provides sufficient emittance intensity for accurate calibration while exhibiting lower persistence compared to conventional high-intensity fluorophores, allowing subsequent readings to be taken without significant interference from residual fluorescence.
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 ensures accurate and reproducible calibration of water detection units by maintaining a consistent emittance curve, reducing the impact of wavelength sensitivity and persistence issues, allowing for precise water detection without significant interference from residual fluorescence.
Implementation Method 1
The filter pad is then illuminated using an ultraviolet (UV) light, wherein a presence of undissolved water on the coated side of the pad will cause the pad to fluoresce a bright yellow. The fluorescence of the pad is directly related to an amount of undissolved water present in the pad
Implementation Method 2
An absorbent polymeric substrate is saturated with a uranine solution
Data Source
AI summary
A kit and method for manufacturing a reference standard for a water detection unit includes a substrate and a tray configured to receive the substrate therein. A tank is configured to receive at least one of the trays therein, wherein a fluorescent solution comprising water and uranine is provided to the tank via an inlet. The solution rises within the tank to saturate the substrate. The trays are then placed in a rotatable rack wherein the substrates are dried to remove excess solution. The dried substrates are then hermetically sealed within a transparent envelope.