Optical Waveguide Sensor Nodes for EMI-Resistant Monitoring
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Solution Overview
Problem
Existing sensor systems for underwater acoustic monitoring, large structural monitoring, and geophysical surveys face challenges with long multichannel analog cables that are expensive, hard to maintain, and susceptible to Electro-Magnetic Interference (EMI, requiring complex power hungry electronics at each sensor node for data synchronization and communication.
Innovation Solution
A system utilizing an optical waveguide with light-modulating sensor nodes that modulate optical signals in response to detected signals, reducing the need for electrical circuitry and using optical components to transmit data back to an interrogator, thereby minimizing power consumption and interference susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically conductive channels are used for power and data transmission, then power delivery and data communication are achieved, but the system becomes susceptible to Electro-Magnetic Interference (EMI) and requires complex electronics at each sensor node
Solution Approach 1:
The patent replaces electrical conductive channels with optical waveguides for data transmission. Optical signals are immune to EMI, eliminating the susceptibility problem. The optical modulator at each sensor node replaces complex electronics by using simple optical modulation mechanisms (such as piezoelectric or thermoelectric effects) to encode sensor data onto light waves, significantly reducing device complexity while maintaining reliability.
Solution Approach 2:
The patent introduces optical waveguides as an intermediary medium between sensor nodes and the central interrogator. Instead of direct electrical connections that are prone to EMI, the optical waveguide acts as a mediator that transmits data as light signals, which are inherently protected from electromagnetic interference. This intermediary approach resolves the contradiction by providing a reliable transmission path without requiring complex shielding or error correction electronics.
2Length of stationary object
If long multichannel analog cables are used for data transmission, then data communication over long distances is achieved, but the cables become expensive, hard to maintain and repair
Solution Approach 1:
The patent segments the data transmission system into independent optical sensor nodes along a single waveguide. Instead of using one long complex multichannel cable, each sensor node is a separate unit that modulates optical signals independently. This segmentation allows individual nodes to be replaced or maintained without affecting the entire system, dramatically improving ease of manufacture and reducing maintenance costs while supporting long-distance deployment.
Solution Approach 2:
The patent makes each sensor node universal by designing it to independently modulate optical signals for multiple data channels. A single optical waveguide can carry data from numerous sensor nodes simultaneously through wavelength division multiplexing or time division multiplexing. This multi-functional approach eliminates the need for separate dedicated cables for each sensor, reducing overall system cost and complexity while enabling long-distance monitoring.
3Productivity
If complex electronics are placed at each sensor node for data synchronization and formatting, then digital data communication is achieved, but power consumption increases significantly
Solution Approach 1:
The patent replaces power-hungry electronic data formatting and synchronization circuits with optical modulation mechanisms. The optical modulator uses minimal power to modulate the optical signal based on sensor measurements, eliminating the need for complex digital signal processing electronics at each node. This substitution maintains high data communication efficiency through precise optical encoding while dramatically reducing power consumption, making the system suitable for remote or battery-powered sensor deployments.
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 system reduces power consumption and maintenance costs by minimizing electrical circuitry, enhances reliability by reducing EMI susceptibility, and allows for efficient data transmission over long distances using optical waveguides, enabling effective monitoring across large areas.
Implementation Method 1
an actuator configured to optically modulate the optical signal by changing physical properties of the optical waveguide from an exterior of the optical waveguide
Implementation Method 2
an optical waveguide having a length extending from an optical interrogator at a first end
Implementation Method 3
The optical interrogator may comprise an optical pulse generator configured to generate the optical signal, wherein the optical signal is an optical pulse
Implementation Method 4
The optical interrogator may further comprise an optical receiver configured to receive the returned modulated optical signal from each of the plurality of light-modulating sensor nodes
Data Source
AI summary
A system including an optical waveguide having a length extending from an optical interrogator at a first end, a plurality of light-modulating sensor nodes disposed at predetermined locations along the length of the optical waveguide, each of the plurality of light-modulating sensor nodes having an optical modulator for modulating an optical signal propagating from the optical interrogator in the optical waveguide, and for returning the modulated optical signal to the optical interrogator in an opposite direction along the same optical waveguide path.