Multi-Spectrum Fiber Optic Sensor for Simultaneous Temperature and Pressure
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Solution Overview
Problem
Existing temperature and pressure fiber sensing systems are limited to single sensor units per optical fiber and cannot detect sensor locations along the fiber, restricting their ability to provide simultaneous and location-specific measurements.
Innovation Solution
A multiple-spectrum-channel fiber optic sensing system with a pulsed optical source and combined fiber grating and polarimetric sensors deployed along a single optical fiber, using separate optical spectrum channels to separate temperature and pressure measurements, allowing for simultaneous and location-specific data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single optical fiber is used for sensing, then the system is compact and easy to deploy, but only single sensor units can be deployed and sensor locations cannot be detected
Solution Approach 1:
The optical fiber is segmented into multiple sensing zones with distinct Bragg wavelengths, allowing multiple sensor units to be deployed along the fiber length. Each segment responds to environmental changes at its specific location, enabling distributed sensing while maintaining a compact single-fiber architecture.
Solution Approach 2:
The system transitions from temporal multiplexing to spectral dimension by using multiple Bragg wavelengths simultaneously. This spectral dimensionality allows multiple sensors to operate concurrently on a single fiber without time division, increasing sensor quantity while reducing system complexity.
2Measurement precision
If multiple sensor types are deployed, then temperature and pressure can be measured simultaneously, but the system cannot identify which sensor location corresponds to which measurement
Solution Approach 1:
Different sensor types are assigned distinct Bragg wavelengths (optical 'colors'). Temperature sensors use one wavelength while pressure sensors use another, allowing the interrogation system to identify both the sensor type and its location simultaneously by detecting which wavelength is reflected from which fiber position.
Solution Approach 2:
The Bragg wavelength acts as an intermediary identifier that carries both sensor type and location information. By encoding sensor identity in the wavelength domain and position in the spatial domain, the system recovers complete measurement data without information loss.
3Adaptability or versatility
If separate wavelength channels are used for different sensor types, then temperature and pressure measurements can be distinguished, but the system complexity increases
Solution Approach 1:
A single optical fiber serves multiple functions by simultaneously carrying temperature and pressure sensing capabilities. The same fiber infrastructure supports multiple sensor types through wavelength division, eliminating the need for separate fibers or complex multi-channel interrogation systems.
Solution Approach 2:
Multiple sensing functions are merged into a single distributed sensing system. Temperature and pressure sensors are combined along the same fiber with their responses separated by wavelength, simplifying the overall system architecture while maintaining adaptability to different measurement requirements.
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 the deployment of multiple sensor units along a single optical fiber, providing accurate and simultaneous temperature and pressure measurements with precise location identification, enhancing the sensitivity and dynamic range of sensing systems.
Implementation Method 1
fiber grating sensor coupled to the optical fiber. The fiber grating sensor provides for temperature measurements
Implementation Method 2
polarimetric sensor coupled to the optical fiber. The polarimetric sensor provides for pressure measurements
Implementation Method 3
Fiber optic sensors employ the fact that environmental effects, such as pressure, strain, vibration, and temperature, can alter the amplitude, phase, frequency, spectral content, or polarization of light propagated through an optical fiber
Data Source
AI summary
A multiple sensor fiber optic sensing system includes an optical fiber having at least first fiber optic sensors and second fiber optic sensors deployed along its length. In response to an interrogating pulse, the first fiber optic sensors generate responses in a first optical spectrum window, and the second fiber optic sensors generate responses in a second, different optical spectrum window. The responses in the first optical spectrum window are measured in a first optical spectrum channel, and the responses in the second optical spectrum window are measure in a second, different optical spectrum channel and provide simultaneous indications of one or more parameters, such as temperature and pressure, in the environment in which the sensors are deployed.