Multi-Wavelength Laser Sensing for Ocean Temperature and Pressure
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Solution Overview
Problem
Existing ocean temperature and pressure monitoring devices are expensive, large, prone to electromagnetic interference, and require complex systems for discrete monitoring, leading to high investment and low reliability, with a need for improved data compatibility and cost-effective, compact solutions.
Innovation Solution
A multi-wavelength laser system utilizing a broadband laser source, pulse controller, and phase shifted fiber bragg grating unit to convert and demodulate pulsed light for simultaneous monitoring of temperature and pressure, employing wavelength division multiplexers and amplifiers for signal processing, and a sensing fiber for continuous ocean monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical devices are used for ocean temperature and pressure monitoring, then monitoring functionality is achieved, but cost increases, size increases, and electromagnetic interference susceptibility increases
Solution Approach 1:
The patent replaces electrical monitoring devices with an optical-based distributed fiber sensing system. The core mechanism uses a laser source emitting light through an optical fiber, where temperature and pressure changes modulate the light properties (phase, intensity, wavelength). This optical substitution eliminates electromagnetic interference susceptibility and reduces system complexity while maintaining monitoring reliability.
Solution Approach 2:
The patent implements a multi-functional integrated system where a single optical fiber serves multiple purposes: it acts as both the transmission medium for light and the sensing element for detecting temperature and pressure. The same fiber infrastructure enables simultaneous monitoring of multiple parameters (temperature, pressure, strain) along its entire length, eliminating the need for separate sensor arrays and reducing overall system complexity.
2Measurement precision
If discrete electronic devices are used for separate temperature and pressure monitoring, then measurement functionality is achieved, but investment cost increases and data compatibility becomes difficult
Solution Approach 1:
The patent merges temperature and pressure sensing capabilities into a single integrated optical fiber system. Both parameters are measured simultaneously using the same light source and detection infrastructure. The system combines multiple sensing functions (temperature, pressure, strain) along the fiber length, enabling synchronized measurement without requiring separate discrete electronic device arrays.
Solution Approach 2:
The optical fiber serves as a universal sensing platform that can detect multiple physical parameters (temperature, pressure, strain) simultaneously. The system uses wavelength-division multiplexing and other optical techniques to extract different parameter information from the same light signal, providing unified data output that improves compatibility while maintaining measurement precision.
3Area of stationary object
If multiple sensor combination arrays are deployed for large-range monitoring, then monitoring coverage increases, but investment cost increases and system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the monitoring area into multiple sections along the optical fiber length. Each segment of the fiber can independently sense parameters at its location, and the system can identify the specific position of detected events through time-of-flight or phase information. This allows large-area monitoring using a single continuous fiber rather than multiple discrete sensor arrays.
Solution Approach 2:
The patent transitions from two-dimensional spatial monitoring (using arrays of sensors at different locations) to one-dimensional distributed monitoring along the fiber length. The optical fiber acts as a continuous linear array of sensors, enabling monitoring coverage along its entire length with a single component, thereby reducing system complexity while expanding coverage area.
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 low-cost, high-precision, continuous monitoring of ocean temperature and pressure with improved data compatibility and reliability, using a compact structure and distributed fiber sensing technology.
Implementation Method 1
a phase shifted fiber bragg grating unit configured to demodulate a plurality of pulsed light arranged by a time sequence and having different wavelengths from the broadband pulsed light
Implementation Method 2
a broadband laser source configured to output broadband laser
Implementation Method 3
a pulse controller configured to convert the broadband laser output by the broadband laser source into broadband pulsed light
Data Source
AI summary
The present application provides a multi-wavelength laser for synchronously monitoring the temperature and pressure of an ocean. A pulse controller is used to convert a broadband laser outputted by a broadband laser source into a broadband pulsed light, and then a phase shifted fiber bragg grating unit is used to demodulate a plurality of pulsed light with different wavelengths from the broadband pulsed light. The pulsed light outputted by the laser is emitted into a sensing fiber in seawater via a wavelength division multiplexer, scattered light is returned to a control demodulation module via the wavelength division multiplexer, the control demodulation module demodulates the scattered light, so that the dynamic pressure is parsed according to a phase change of a light signal, and the seawater temperature is parsed according to a wavelength change of the light signal.