Flexible Containment System for Optical Flow Sensing
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Solution Overview
Problem
Existing flow sensing systems in sewers face accuracy, longevity, and cost issues due to sensor positioning errors, susceptibility to clogging, and environmental challenges such as high pressure, chemical exposure, and rodent damage, while also lacking effective protection for communication media.
Innovation Solution
A containment system with an elongate flexible body mounted on the conduit wall, featuring a sensor cavity for sensing elements and shielded channels for communication media, providing protection and secure routing within the conduit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discrete sensors are used for flow monitoring, then the system can detect flow parameters, but the sensors are prone to clogging and calibration loss due to small transduction surface area
Solution Approach 1:
The patent replaces traditional mechanical/discrete ultrasonic sensors with a distributed optical sensing system using optical fibres. The optical fibres run along the conduit base and detect flow parameters through optical principles rather than mechanical transduction, eliminating the clogging issue associated with small discrete sensor surfaces while maintaining measurement precision.
Solution Approach 2:
The sensing system is divided into multiple discrete optical fibre segments that can be individually installed and replaced. Each optical fibre segment acts as an independent sensing element, allowing the system to maintain high reliability through modular replacement if one segment fails, while the distributed nature of multiple segments provides comprehensive flow coverage.
2Productivity
If multiple discrete sensors are installed along the conduit, then flow data can be collected, but the system complexity and cost increase due to power and data management requirements
Solution Approach 1:
The patent merges multiple sensing functions into a single continuous optical fibre system. Instead of managing multiple independent discrete sensors each requiring power and data connections, the optical fibre system provides distributed sensing along its entire length, collecting flow data continuously without requiring intermediate power or data management infrastructure.
Solution Approach 2:
The optical fibre serves multiple functions simultaneously: it acts as both the sensing element and the data transmission medium. The same optical fibre that detects flow parameters also carries the measurement data back to the processing system, eliminating the need for separate power and data communication infrastructure required by discrete electronic sensors.
3Reliability
If powered electronic devices are installed in sewers, then sensing functionality is achieved, but ATEX approval is required due to potential explosive atmosphere from methane buildup
Solution Approach 1:
The patent replaces electronic sensing devices that require power supply with passive optical sensing elements. Optical fibres do not require electrical power to function as sensing elements, eliminating the risk of ignition in potentially explosive sewer atmospheres and removing the need for ATEX certification while maintaining full sensing functionality.
4Measurement precision
If optical sensor fibres are installed along the conduit base, then distributed flow measurement is achieved, but the fibres are vulnerable to environmental hazards including water ingress, chemical attack, and physical damage
Solution Approach 1:
The patent uses a flexible protective sheath or coating that conforms to the optical fibre, providing a barrier against water ingress, chemical attack, and mechanical damage. This flexible protective layer allows the optical fibre to maintain its sensing capabilities while being protected from the harsh sewer environment, including resistance to high-pressure water jet cleaning and rodent damage.
Solution Approach 2:
The patent employs composite material structures combining the optical fibre with protective materials that provide chemical resistance, mechanical strength, and environmental protection. The composite construction integrates the sensing functionality of the optical fibre with the protective properties of specialized materials designed to withstand sewer conditions including chemical exposure and physical stress.
Data Source
AI summary
A containment system for installation internally along a conduit, for co-locating at least one sensing element and one or more communication media within the conduit, the containment system comprising: an elongate flexible body mountable on a wall of the conduit to extend longitudinally along the conduit, the body including: an elongate sensor cavity, extending longitudinally along the body, for receiving the at least one sensing element; and a shield portion including one or more elongate channels, extending longitudinally along the shield portion, each channel for receiving one or inure communication media.