Distributed microstructure sensor network based on time division wavelength division multiplexing and its application method

Abstract

The invention provides a distributed microstructure sensing network based on wavelength division time division multiplexing and its application method. The network includes a broadband light source (1), an optical circulator (3), an optical distribution network and a plurality of distributed An optical fiber sensing link (11), the sensing unit is connected to the demodulation unit through an optical distribution network, an optical circulator (3), and a full-spectrum scanning module (5) in sequence. The invention adopts the hybrid time division / wavelength division network architecture, has the characteristics of super large capacity, super long distance, low unit demodulation cost, high sensing sensitivity, low power consumption, etc., and is suitable for large-scale distributed sensing multiplexing.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, realizes a super-large-capacity distributed optical fiber sensing network through the design of a hybrid wavelength division and time division multiplexing system, and proposes a fast demodulation method for the sensing network. Background technique [0002] Optical fiber sensors are mainly used for sensing temperature, stress, pressure and other environmental parameters. Due to their passive and high-precision characteristics, they have been widely used in bridges, dams, oil fields, aerospace, marine monitoring, geological monitoring and other fields, especially based on The distributed optical fiber sensing technology based on the principle of OTDR (Optical Time Domain Reflectometry), with its advantages of distributed measurement, no blind area, high monitoring density, wide monitoring range, and simple sensor structure, greatly meets the application requirements. The distribution...

AI Technical Summary

Problems solved by technology

Cathy Crunelle from Mons College in Belgium implemented a λ-OTDR system on the basis of wavelength-tuned OTDR technology, using a low-reflectivity grating (R<10%) junction and wavelength division multiplexing (WDM), but the number of multiplexed gratings is limited

The application number is 201210390000.8, and the patent application titled "ultra-large-capacity time-division wavelength-division fiber grating sensing system and its query method" proposes an ultra-large-capacity time-division multiplexing system, which realizes large-capacity The addressing and query of optical fiber sensors realizes the time-division multiplexing of large-capacity FBG (Fiber Bragg Grating) units, which has good application value. However, due to the lack of multiplexing of wavelength division and frequency division, the system performance has not been maximized. promote

The application number is 201110414568.4, and the patent application titled "A Large-Capacity Parallel Fiber Bragg Grating Sensor Analyzer" uses space division and wavelength division multiplexing technology, and adopts a synchronous control mechanism to detect and collect multiple optical signals. Realized the multiplexing of sensing units with larger capacity, but this solution uses more photodetectors, which greatly increases the system cost

Images