Deep Sea pH Sensor Isolation Groove Design
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Solution Overview
Problem
Existing pH sensors fail to accurately measure ocean CO2 levels due to inability to withstand extreme pressures at great depths and are prone to hysteretic strain and corrosion from stagnant seawater.
Innovation Solution
A deep sea pH sensor design featuring a sensor electrode with an isolation groove and a wide street around it, sealed with an O-ring to prevent pressure-induced stress and stagnation, allowing continuous fluid flow and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pH sensor is designed to withstand extreme pressures at great ocean depths, then the sensor can operate at maximum ocean depths, but the sensor is subjected to hysteretic strain and pressure-induced stress that compromise measurement accuracy
Solution Approach 1:
The sensor is divided into functionally independent segments: the sensor electrode is separated from the sealing structures (O-ring, seal plate, cover plate) by isolation grooves. This segmentation allows the sealing components to withstand external pressure independently while the sensor electrode remains isolated from pressure-induced stress, preventing hysteretic strain and maintaining measurement accuracy across varying ocean depths
Solution Approach 2:
Isolation grooves act as intermediary elements between the sensor electrode and the sealing structures. These grooves create a physical buffer zone that prevents direct transmission of pressure-induced stress from the seal to the sensor electrode, thereby protecting the sensor from hysteretic strain while still allowing the seal to perform its pressure-containing function
2Adaptability or versatility
If the sensor is sealed to withstand high pressure, then the sensor can operate at deep ocean depths, but liquid stagnation occurs leading to corrosion
Solution Approach 1:
The isolation grooves segment the liquid flow path into distinct zones, creating channels that guide liquid flow across the sensor electrode surface. This segmentation prevents stagnant zones from forming, ensuring continuous liquid circulation that prevents corrosion while the O-ring and seal plate maintain pressure resistance
Solution Approach 2:
The isolation groove design ensures continuous liquid flow across the sensor electrode surface by eliminating dead zones and stagnation areas. This continuous flow action prevents liquid stagnation and associated corrosion, while the seal maintains continuous pressure containment, allowing the sensor to operate reliably at deep ocean depths
Data Source
AI summary
Systems and methods are provided for a deep sea pH sensor. In one embodiment, a method for manufacturing a pH sensor comprises forming a sensor electrode in a working surface of a die wherein the sensor electrode is able to sense the pH of a liquid and forming at least one isolation groove around the sensor electrode on the working surface of the die, wherein the die has a wide street around the sensor electrode and the at least one isolation groove. The method further comprises mounting the die onto a base and securing a seal on the working surface in the wide street, wherein the seal surrounds the isolation groove, the seal sealing the liquid within the portion of the working surface of the die containing the sensor electrode and the isolation groove, when the pH sensor is subjected to high pressure.