Automated DTS Testing via Induced Temperature Changes
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Solution Overview
Problem
Current distributed temperature sensing (DTS) systems for pipeline leakage detection lack a reliable and efficient method for continuous, autonomous testing of their efficacy and reliability, relying on periodic manual testing which is insufficient for SIL certification and does not generate sufficient operational history data.
Innovation Solution
An automated distributed sensing system with fibre optic cables and a controller that periodically induces temperature or strain changes in test cables, allowing the system to continuously test the DTS unit's response and detect malfunctions or leaks, using cooling or heating devices and a relay to trigger alarms and monitor reaction times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic manual testing is performed, then system operation is maintained, but testing frequency and reliability data collection are insufficient
Solution Approach 1:
The system performs self-testing through automated test cables that periodically induce temperature or strain changes and monitor the DTS unit's response. This eliminates the need for manual intervention while continuously generating reliability data, resolving the contradiction between maintaining system operation and increasing testing frequency.
Solution Approach 2:
The system performs preliminary tests by simulating leakage conditions before actual leaks occur. The automated testing proactively generates reliability data and identifies potential system failures, enabling preventive maintenance while maintaining continuous operation without manual intervention.
2Reliability
If automated continuous testing is implemented, then testing frequency and reliability data are increased, but system complexity increases
Solution Approach 1:
The test cables serve multiple functions: they act as both sensing elements and test stimuli generators. The same fibre optic cables used for monitoring also serve as the test medium when subjected to controlled temperature or strain changes, eliminating the need for separate testing equipment and reducing overall system complexity.
Solution Approach 2:
The system uses intermediary test cables with known characteristics to mediate the testing process. These cables transmit controlled changes (temperature or strain) and carry the response signals back to the DTS unit, providing a standardized interface that simplifies the testing mechanism while enabling continuous reliability assessment.
3Reliability
If manual testing is performed, then system deployment is simple, but sufficient operational history data for SIL certification cannot be generated
Solution Approach 1:
The system automatically generates the operational history data required for SIL certification through continuous self-testing. The automated collection of response times and detection accuracy metrics eliminates the need for complex manual testing procedures while building the necessary certification portfolio.
Solution Approach 2:
The system maintains continuous testing operation to accumulate the extensive operational history data needed for SIL certification. By performing tests continuously rather than periodically, the system builds a robust data set that demonstrates reliability over time, enabling certification while maintaining simple automated operation.
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
Enables continuous, autonomous testing of DTS systems, increasing data collection frequency and reliability assessment, facilitating SIL certification by simulating leakage conditions and monitoring system responses, thus improving the confidence in the system's performance and safety integrity.
Implementation Method 1
The DTS unit emits pulses of light through the sensing cables and receives backscattered light signals. These light signals are processed using ODTR techniques (Optical Time Domain Reflectometry) to derive therefrom temperature values associated with locations along the sensing line.
Implementation Method 2
The DTS unit emits pulses of light through the sensing cables and receives backscattered light signals
Implementation Method 3
at least one device arranged relative to the at least one test cable to induce a change in the at least one physical parameter associated with the at least one test cable
Data Source
AI summary
Automated systems and methods for testing the efficacy and reliability of distributed temperature sensing (DTS) system. The DTS system has a fiber optic sensing cable laid out on a structure to be monitored, and a DTS unit for sensing temperature along a sensing line at locations thereof. The DTS unit is optically coupled to the sensing cable. The sensing cable is optically coupled to a test cable to form the sensing line. Also provided, is a cooling device for cooling the test cable. A controller periodically actuates the cooling device to thereby test the efficacy and reliability of the DTS system. A relay configured for communication with the DTS unit and the controller is operable to trigger an alarm condition in response to a signal received from the DTS unit indicative that a temperature drop in the sensing line at a location thereof has been detected.