Ground pH Sensor with Conductive Polymer for Cathodic Protection
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Solution Overview
Problem
Existing methods for determining the pH of soil surrounding buried pipelines are imprecise, costly, or pose safety risks, and do not allow for continuous monitoring, which is crucial for effective cathodic protection.
Innovation Solution
A pH sensor using conductive polymers, such as polypyrrole, combined with a metallic element, is inserted near the pipeline to measure pH at a shallow depth, mimicking the environment of the buried pipe and receiving the same electrical potential, allowing for precise and continuous pH monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pH test strips are placed in the soil near pipes, then a pH reading can be obtained, but the reading is imprecise and only approximate
Solution Approach 1:
The patent replaces chemical pH test strips with an electrical measurement system using a pH sensor that measures electrical potential difference. This substitution enables precise continuous measurements while maintaining ease of operation through automated electrical readings rather than subjective color interpretation.
Solution Approach 2:
The patent creates a simplified model system by placing a metallic element and pH sensor at shallow depth in the soil, which copies the electrochemical environment experienced by buried pipelines. This model allows accurate pH measurement without requiring excavation to access the actual pipeline environment.
2Measurement precision
If the leachate method is used to measure pH, then a pH value can be obtained, but the measurement is not precise due to dilution
Solution Approach 1:
The patent replaces the chemical extraction and dilution process of the leachate method with a direct electrical potential measurement using a pH sensor. This eliminates the need for soil sampling, laboratory processing, and dilution steps, providing precise measurements in situ without altering the soil chemistry.
3Measurement precision
If an antimony-based electrode is used, then pH measurement is possible, but the sensor is toxic and carcinogenic
Solution Approach 1:
The patent changes the material parameter of the pH sensor from antimony-based electrode to a metallic element with polymer coating. This material substitution eliminates toxicity and carcinogenicity while maintaining the sensor's ability to measure pH through electrical potential difference in the soil environment.
4Measurement precision
If excavation is performed to measure pH near buried pipes, then accurate pH measurement is possible, but the cost is high
Solution Approach 1:
The patent creates a simplified model system at shallow depth that replicates the electrochemical conditions around buried pipelines. By measuring pH in this model system using a metallic element and polymer-coated sensor, accurate pipeline environment data is obtained without the high costs of excavation and direct pipeline access.
5Productivity
If pH paper is used for measurement, then a single reading is obtained, but continuous monitoring is not possible
Solution Approach 1:
The patent replaces single-use chemical pH paper with an electrical sensor system that can continuously measure pH through electrical potential difference. This enables ongoing monitoring of soil pH conditions around pipelines while maintaining simplicity through automated electrical measurements that can be taken repeatedly without consuming additional materials.
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 provides a robust, safe, and accurate pH measurement at the soil surface, enabling effective cathodic protection of pipelines without direct excavation, and allows for automatic adjustment of electrical potential based on pH readings.
Implementation Method 1
a surface comprising a polymer material capable of attracting protons
Implementation Method 2
an electrical potential, in particular a cathodic protection electrical potential, is applied to the metallic element
Data Source
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Figure 2
Figure 3~4
AI summary
A pH sensor device, intended to be inserted into the ground in order to be in contact with a region containing a fluid from the ground of which one would like to know the pH, comprises: • - a pH sensor (101) comprising a surface (102) covered in a polymer material configured to be in contact with the region containing a fluid when the device is inserted into the ground • - a metal element (104) provided with a surface (105) configured to be in contact with the region containing the fluid when the device is inserted into the ground, • - electrical connection means (108, 109, 110) connected at least to the metal element and configured to receive a cathodic protection electrical potential for the metal element. The invention also relates to a method for measuring pH that can be used for cathodic protection.