Pressure Compensated pH Sensor Fluid Support
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Solution Overview
Problem
Conventional pH sensors face inaccuracies and require complex calibration when used in high-pressure environments due to mechanical components shifting and bending, leading to variable support structures and time-consuming calibration processes.
Innovation Solution
A pressure compensated pH sensor apparatus with a fluid reservoir and malleable solid material that evenly supports the sensing element, preventing bending and warping by transferring environmental pressure to a fluid chamber or malleable solid material, eliminating the need for representative calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pH sensors are used in high-pressure environments, then pH measurement is possible, but measurement accuracy deteriorates due to mechanical component shifting and bending
Solution Approach 1:
The sensor is divided into functionally independent segments: the sensing element carrier with pH sensing element, the pressure chamber with fluid material, and the support structure. This segmentation allows each component to perform its specific function without interfering with others, maintaining measurement accuracy while providing pressure compensation.
Solution Approach 2:
The fluid material in the pressure chamber acts as a counterbalancing medium that applies equal pressure to both sides of the sensing element carrier, compensating for external high-pressure effects. This pressure balancing prevents mechanical deformation of the sensing element, ensuring reliable measurements in high-pressure environments.
2Reliability
If pressure compensation is implemented using fluid material and chamber structure, then sensor stability improves in high-pressure environments, but device complexity increases
Solution Approach 1:
The pressure chamber and fluid material serve multiple functions: they compensate for pressure effects on the sensing element, provide mechanical support, and maintain the structural integrity of the sensor assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The sensing element carrier is designed as a thin-walled structure that can flexibly transmit pressure from the fluid material to the sensing element. This flexible design allows for effective pressure compensation while minimizing the amount of material and structural complexity required.
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 stable and accurate pH measurements in high-pressure environments, such as full ocean depth, without the need for complex calibration, ensuring consistent results across sensors.
Implementation Method 1
a pressure chamber filled with a fluid material completely supporting the sensing element, whereby the external environmental presure is transmitted via a tube and a silicon fluid therein to pressure another tube which further transmits the pressure to an internal filling solution
Data Source
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AI summary
A pressure compensated pH sensor apparatus includes: a pH sensing component comprising a sensing portion that is exposed to a fluid source when in use; a pressure chamber located in a position under the sensing portion and that envelopes all of the sensing portion not exposed to the fluid source when in use; and a pressure compensation mechanism located within the pressure chamber, wherein the pressure compensation mechanism reacts to pressure from an environment outside the apparatus, thereby support the sensing portion.