Optical Bus System for Reflection Mode Sensor Multiplexing
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Solution Overview
Problem
Existing fiber-optic acoustic sensors operating in reflection mode face challenges in achieving optimal signal-to-noise ratio and noise figure performance, particularly when multiplexing a large number of sensors, due to signal attenuation and noise contributions from optical couplers and amplifiers.
Innovation Solution
The implementation of an optical bus system with distributed optical amplifiers and optimized coupling ratios, along with time-division multiplexing and wavelength-division multiplexing, to enhance signal power and reduce noise, allowing for efficient data transmission and processing across multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of sensors are multiplexed using reflection mode fiber-optic acoustic sensors, then the quantity of sensors that can be monitored increases, but the signal-to-noise ratio and noise figure performance deteriorate due to signal attenuation and noise contributions from optical couplers and amplifiers
Solution Approach 1:
The system divides the long optical bus into multiple segments by placing optical amplifiers at intermediate locations. This segmentation allows each amplifier to boost signals before they traverse the entire bus length, reducing cumulative attenuation and noise effects when multiplexing many sensors.
Solution Approach 2:
Optical amplifiers are positioned in advance along the optical bus to provide signal boosting before signals reach distant sensors. This preliminary amplification action prevents signal degradation from occurring, maintaining high signal-to-noise ratio even when many sensors are multiplexed.
2Measurement precision
If optical amplifiers are distributed along the optical bus to boost signals, then the signal power is enhanced and noise figure is reduced, but the device complexity increases
Solution Approach 1:
The optical amplifiers serve multiple functions: they boost signal power, compensate for attenuation, and maintain consistent signal levels across all sensors in the multiplexed array. This multi-functionality justifies the added complexity by delivering significant performance benefits.
Solution Approach 2:
The system optimizes parameters such as amplifier gain, spacing between amplifiers, and coupling ratios to achieve the desired balance between signal boosting and complexity management. By carefully tuning these parameters, high performance is achieved without excessive complexity.
3Quantity of substance
If time-division multiplexing is used to transmit data from multiple sensors, then the number of sensors that can be monitored increases, but signal attenuation and noise contributions increase
Solution Approach 1:
Optical amplifiers are positioned in advance along the optical bus to provide signal boosting before signals traverse the entire bus length. This preliminary amplification action prevents signal degradation from occurring, maintaining high signal-to-noise ratio even when many sensors are multiplexed using time-division multiplexing.
Solution Approach 2:
The optical bus is segmented into multiple sections with amplifiers placed at intermediate points. This segmentation reduces the effective distance signals must travel between amplifiers, minimizing cumulative attenuation and enabling reliable time-division multiplexing of many sensors.
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 configuration significantly improves the signal-to-noise ratio and noise figure performance, enabling the multiplexing of a large number of sensors while maintaining consistent output across all elements, effectively addressing the limitations of previous technologies.
Implementation Method 1
Various fiber optic sensor systems have been previously disclosed that provide acoustic pressure measurements based on the relative displacements of the two mirrors of a Fabry-Perot interferometric cavity
Implementation Method 2
apparatus and methods utilizing optical sensors operating in the reflection mode
Data Source
AI summary
Optical apparatus and methods utilizing sensors operating in the reflection mode are provided. The apparatus includes at least one optical bus. The at least one optical bus is configured to be optically coupled to at least one source of input optical signals, to at least one optical detector, and to a plurality of reflective sensing elements. The at least one optical bus transmits an input optical signal from the at least one source to the plurality of reflective sensing elements. At least one reflective sensing element of the plurality of reflective sensing elements receives a portion of the input optical signal and reflects at least a portion of the received portion. The at least one optical bus transmits the reflected portion to the at least one optical detector.