Helical Waveguide Acousto-Optical Transducer for Pipeline Leak Detection
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Solution Overview
Problem
Current methods for detecting and monitoring leaks in steam plants are inefficient due to the complexity of installing fiber optic sensing systems and the attenuation of high-frequency sound signals, leading to long inspection times and increased operational costs in large industrial environments.
Innovation Solution
An acousto-optical transducer with a helically arranged waveguide on a mechanical membrane enhances acoustic sensitivity, allowing for real-time monitoring of leaks using optical waveguides that convert acoustic waves into mechanical waves, and can be replicated for large coverage areas without the need for significant adaptations to existing installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fiber optic sensing systems are installed directly coupled to ducts for leak detection, then measurement sensitivity is improved, but installation complexity and device complexity increase significantly
Solution Approach 1:
The patent introduces an acousto-optical transducer as an intermediary device that couples acoustic sensors to the optical fiber. This transducer converts acoustic waves into optical signals, enabling indirect sensing that maintains high sensitivity while simplifying installation, as the optical fiber does not need to be directly coupled to the duct structure.
Solution Approach 2:
The patent replaces direct mechanical coupling of optical fiber to ducts with an acousto-optical conversion mechanism. Instead of mechanically attaching the fiber to vibration sources, acoustic waves are detected and converted to optical signals, eliminating complex mechanical installation requirements while preserving detection sensitivity.
2Ease of operation
If optical cables are placed far from ducts to simplify installation, then ease of operation is improved, but acoustic signal detection capability deteriorates due to signal attenuation
Solution Approach 1:
The acousto-optical transducer serves as a mediator that enables the optical fiber to be positioned away from the duct while maintaining detection capability. The transducer captures acoustic signals near the duct and transmits them optically, bridging the gap between the sensor and the acoustic source.
Solution Approach 2:
The patent transitions from direct spatial proximity coupling to a different dimensional approach by using acousto-optical conversion. The detection mechanism moves from relying on physical distance to utilizing wave conversion and optical transmission, allowing flexible positioning while maintaining sensitivity.
3Measurement precision
If discrete acoustic sensors are used for leak detection, then measurement capability is improved, but the number of sensors required increases significantly for dense coverage
Solution Approach 1:
The patent merges multiple discrete acoustic sensor functions into a single acousto-optical transducer that interfaces with a continuous optical fiber. This consolidation reduces the number of individual sensor components while maintaining distributed sensing capability along the entire fiber length.
Solution Approach 2:
The optical fiber in the acousto-optical transducer system serves multiple functions: it acts as both the sensing element and the signal transmission medium. This multi-functionality eliminates the need for separate discrete sensors at each measurement point, reducing overall component quantity while maintaining comprehensive coverage.
4Measurement precision
If comprehensive leak inspection is performed using portable instruments and visual inspection, then measurement accuracy is improved, but inspection time increases significantly
Solution Approach 1:
The patent implements continuous acoustic monitoring through the optical fiber network, replacing periodic portable inspections. The system continuously detects acoustic signals along the entire pipeline length, providing real-time leak detection without the need for repeated manual inspection visits, thereby dramatically reducing inspection time while maintaining detection accuracy.
Solution Approach 2:
The patent replaces manual portable inspection instruments with an automated acousto-optical sensing system. The continuous optical fiber-based acoustic monitoring eliminates the need for human operators to physically move inspection equipment along the pipeline, automating the detection process and reducing inspection time while preserving measurement accuracy.
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 enables real-time identification and quantification of steam losses, reducing operational costs and the need for on-site personnel, while maintaining continuous monitoring of acoustic and thermal signals across extensive industrial plant areas.
Implementation Method 1
an acousto-optical transducer... comprising a waveguide... wherein the waveguide is helically arranged and rigidly fixed under the membrane
Implementation Method 2
the waveguide is helically arranged... The helical arrangement is responsible for increasing the waveguide length, which accordingly increases the transducer sensitivity
Implementation Method 3
a material membrane having mechanical properties that enhance the conversion of acoustic waves into mechanical waves in the membrane structure itself
Data Source
AI summary
The present invention is in the field of technologies applied to fluid transporting pipelines and, more specifically, it refers to an acousto-optical transducer and a method capable of sensing, monitoring and quantifying losses and leaks in steam plants in oil and gas, food, energy generation industries, among others. Particularly, the present invention describes an acousto-optical transducer for sensing, locating and quantifying leaks in pipelines and equipment for use in distributed optical sensing systems. The apparatus comprises a structure that maximizes the acoustic sensitivity of the fiber, consisting of a housing; a waveguide; a membrane; and a membrane attachment bracket for supporting the membrane; wherein the waveguide is helically arranged and rigidly fixed under the membrane. The method describes the use of the device in optical sensing systems for monitoring steam losses.