Sagnac/Mach-Zehnder interferometer profile fiber sensing system and time domain positioning method thereof

Abstract

The invention discloses a Sagnac/Mach-Zehnder interferometer profile fiber sensing system and a time domain positioning method thereof. The system comprises a nested structure of a Sagnac interferometer consisting of three fiber couplers and four fibers and a Mach-Zehnder interferometer, wherein the Sagnac/Mach-Zehnder interferometers are respectively connected with an incoherent light source and two photoelectric detectors. In the time domain correlation positioning method, the cross-correlation operation of disturbing signals detected by the Sagnac interferometer and the Mach-Zehnder interferometer are utilized to determine the time used from disturbance propagation to one end of a sensing fiber, the delay time of a maximum value point of a cross-correlation curve corresponds to the time, and a disturbance position is determined by using the time. The invention overcomes the defects of limit positioning distance and positioning precision of a traditional Sagnac nterferometer profile fiber sensing system.

Description

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AI Technical Summary

Benefits of technology

This new technology uses an Optrode Interference Microscope (OMI) sensor that can be used for detection purposes while also being able to track changes over time without requiring external lights or equipment. It achieves this by measuring how well two different wavelength signals are mixed together when they pass through certain parts of their device called the microlens array. By analyzing these measurements it provides valuable insights into any issues affecting signal quality such as power supply failings or environmental factors like temperature fluctuations.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the accuracy and reliability of detecting leaks caused by oil/gas pipe lines during operations such as sewerage drainage works at public places like airports or military bases where large amounts of water can accumulate over time without being detected properly.

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