Flexible Diaphragm Pressure Balancing for Sensor Protection
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Solution Overview
Problem
Sensing systems, such as flow meters and solenoid-coil based sensors, deteriorate with increasing operating temperature and pressure in harsh environments, and existing pressure compensation methods like isolation layers and RF absorbing materials are ineffective, especially in deep environments with low operating frequencies.
Innovation Solution
A pressure management system that includes a housing with a fluid chamber housing a balancing fluid and a flexible device to balance pressure by drawing a portion of the test fluid from the sampling assembly and exerting it on the balancing fluid, thereby protecting the sensor from pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation layers are used for pressure compensation, then sensor protection is improved, but sensing system response is affected due to metallic absorption shield interference
Solution Approach 1:
The patent introduces a flexible diaphragm as an intermediary element between the high-pressure test fluid and the sensor assembly. This diaphragm transmits pressure mechanically to a balancing fluid while physically isolating the sensor from direct pressure exposure, thereby protecting the sensor without interfering with its response to the fluid being measured.
Solution Approach 2:
The patent employs a hydraulic pressure balancing system where a balancing fluid (liquid or gas) is used to counteract the pressure exerted by the test fluid on the diaphragm. This creates a balanced pressure environment that protects the sensor while allowing accurate measurement of the test fluid properties.
2Reliability
If RF absorbing materials are used to shield sensing systems, then sensor protection from interference is improved, but availability of suitable materials in deep environments is reduced
Solution Approach 1:
The patent extracts the RF shielding function from the pressure compensation system by placing the sensor assembly in a separate, shielded housing that is isolated from the high-pressure environment. This allows the use of standard RF shielding materials in the housing without requiring specialized materials that can withstand both high pressure and provide RF shielding.
3Reliability
If pressure balancing device is added to protect sensor, then sensor protection is improved, but device complexity increases
Solution Approach 1:
The patent uses a flexible diaphragm as a simple yet effective pressure-balancing element. This thin flexible membrane can withstand high pressures while allowing the sensor assembly to remain in a separate, protected environment. The diaphragm's flexibility allows it to transmit pressure changes without requiring complex mechanical structures.
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
This system effectively compensates for pressure exerted on sensors, preventing malfunction and ensuring accurate readings in harsh environments by distributing pressure across the housing walls, allowing the sensor to operate within a stable pressure environment.
Implementation Method 1
The flexible device is configured to balance pressure exerted by the test fluid on the sampling assembly by exerting pressure on the balancing fluid with the second portion of the test fluid
Implementation Method 2
This system effectively compensates for pressure exerted on sensors, preventing malfunction and ensuring accurate readings in harsh environments by distributing pressure across the housing walls
Data Source
AI summary
A pressure management system for sensors is provided. The system includes a sampling assembly. The sampling assembly is configured to hold a first portion of a test fluid. Further, the system includes at least one sensor disposed proximate to the sampling assembly. The sensor is configured to determine at least one property of the test fluid. The system also includes a housing that is disposed around the sampling assembly. The housing defines a fluid chamber that houses a balancing fluid. Furthermore, the system includes a flexible device disposed in the fluid chamber that draws a second portion of the test fluid. The flexible device is configured to balance pressure exerted by the test fluid on the sampling assembly by exerting pressure on the balancing fluid with the second portion of the test fluid.