Multi-Light Source Optical Fiber Simultaneous Interrogation
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Solution Overview
Problem
Conventional fiber-optic sensor systems for measuring parameters like temperature in harsh environments, such as downhole applications, face inefficiencies due to the need for sequential interrogation of optical fibers, which prolongs measurement times and reduces resolution.
Innovation Solution
A multi-light source system is employed, where multiple optical fibers are simultaneously interrogated using different wavelengths, allowing for simultaneous measurement of temperature and correction for differential attenuation, thereby reducing measurement time and improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential interrogation of optical fibers is used, then device complexity is reduced, but measurement time increases and productivity decreases
Solution Approach 1:
The system divides the interrogation task by assigning different optical sources to different optical fibers. Each light source independently interrogates its assigned fiber simultaneously, segmenting the measurement process across multiple parallel channels rather than using a single sequential source.
Solution Approach 2:
Multiple optical sources are combined to operate simultaneously on multiple fibers. The system merges the capabilities of multiple light sources and detectors to achieve parallel interrogation, where multiple measurements occur at the same time rather than taking turns.
2Device complexity
If sequential interrogation of optical fibers is used, then device complexity is reduced, but measurement resolution decreases
Solution Approach 1:
The measurement process is segmented into parallel independent measurements, where each optical source-detector pair performs its own high-resolution measurement simultaneously. This segmentation allows each channel to maintain full resolution without being compromised by time-sharing constraints.
Solution Approach 2:
The system maintains continuous useful action by having multiple sources operating simultaneously rather than alternating. Each optical source continuously interrogates its assigned fiber without interruption, ensuring that measurement resolution is not degraded by gaps or switching transitions inherent in sequential operation.
3Productivity
If multiple optical sources are used for simultaneous interrogation, then measurement speed and productivity improve, but device complexity increases
Solution Approach 1:
The system segments the complex task of simultaneous multi-fiber interrogation into manageable independent channels. Each channel consists of a dedicated light source and detector pair that operates autonomously, simplifying the overall control architecture while achieving high-speed parallel measurement.
Solution Approach 2:
The system employs multiple instances of the same functional units (light sources and detectors) that can be configured for simultaneous operation. Each unit performs the same basic function of optical interrogation, but their parallel deployment creates a multi-functional system capable of measuring multiple fibers at once, improving productivity without requiring fundamentally different components.
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 approach enables faster and more accurate parameter measurement by allowing both lasers to be used 100% of the time, improving update rates and reducing the time required for measurements, while maintaining the ability to correct for hydrogen diffusion and other environmental factors.
Implementation Method 1
Distributed Temperature Sensing (DTS) systems utilize fiber optic cables or other devices capable of measuring temperature values at multiple locations along the length of a wellbore
Implementation Method 2
a first light source configured to launch a first optical signal into at least the first optical fiber, and a second light source configured to launch a second optical signal into at least the second optical fiber
Data Source
AI summary
An embodiment of a system for measuring a parameter includes at least a first optical fiber and a second optical fiber configured to be disposed in one or more boreholes in an earth formation, the first optical fiber and the second optical fiber including a plurality of sensing locations. The system also includes a first light source configured to launch a first optical signal into at least the first optical fiber, and a second light source configured to launch a second optical signal into at least the second optical fiber, wherein the first optical signal and the second optical signal are launched at least substantially simultaneously. The system further includes a processor configured to receive measurement data generated based on backscattered signals from at least the first optical fiber and the second optical fiber the reflected signals, the processor configured estimate the parameter based on the measurement data.