Optical Water Hardness Sensor with Reversible Matrix
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Solution Overview
Problem
Current methods for measuring water hardness, such as colorimetric and fluorescent assays, are labor-intensive, impractical for real-time monitoring, and do not account for variable hardness levels, leading to inefficient detergent use and suboptimal water softener performance.
Innovation Solution
A sensor system that includes a substrate with a sensing matrix and a light source and detector to measure calcium and magnesium levels in water in real-time, using reversible chemical reactions and optical techniques for inline monitoring in appliances and water softeners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If colorimetric or fluorescent assays are used to measure water hardness, then measurement capability is achieved, but the process becomes labor-intensive and impractical for real-time monitoring
Solution Approach 1:
The patent replaces manual colorimetric/fluorescent assay procedures with an automated optical sensing system. The sensor uses a light source to illuminate the sensing element and a photodetector to measure optical properties, automatically converting chemical information about calcium and magnesium ions into electrical signals for real-time hardness measurement without manual intervention.
Solution Approach 2:
The sensing element is designed to automatically react with calcium and magnesium ions in the water sample, generating optical signals that are directly detected and converted into hardness measurements. The system performs self-measurement without requiring external reagent addition or manual processing steps.
2Duration of action of stationary object
If reversible chemical reactions are used in the sensing element, then the sensor can be reused continuously, but the complexity of the sensing mechanism increases
Solution Approach 1:
The sensing element utilizes reversible chemical reactions where the binding affinity between the sensing material and calcium/magnesium ions changes based on ion concentration. This allows the sensor to dynamically adjust its response and be regenerated by changing environmental parameters such as pH or ionic strength, enabling continuous reuse without permanent chemical consumption.
3Productivity
If real-time hardness monitoring is implemented, then detergent usage and water softener performance are optimized, but the device complexity and cost increase
Solution Approach 1:
The optical sensing system is designed to be adaptable for use in multiple types of appliances including washing machines, dishwashers, and water softeners. The same basic sensor architecture can monitor hardness in different water systems and integrate with various control algorithms to optimize detergent dosing, wash cycles, and regeneration timing across different appliance types.
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 real-time monitoring of water hardness, optimizing detergent usage and water softener regeneration by providing accurate and continuous measurements, reducing waste and improving appliance performance.
Implementation Method 1
a light source configured to direct light through the substrate and the sensing element. The sensor also includes a light detector configured to receive transmitted light from the substrate and the sensing matrix and to generate a signal representative of selective wavelengths of the light indicative of the one or more chemical species in the flow of water
Data Source
AI summary
A sensor including a substrate and a sensing element disposed on a substrate is provided. The sensing element includes a sensing matrix in contact with a flow of water, an indicator for one or more chemical species in the flow of water, and a selectivity component that reacts reversibly with the one or more chemical species. The sensor also includes a light source configured to direct light through the substrate and the sensing element. The sensor further includes a light detector configured to receive transmitted light from the substrate and the sensing matrix and to generate a signal representative of selective wavelengths of the light indicative of the one or more chemical species in the flow of water.