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Strain sensing system and method based on flight time detection

A strain sensing and time-of-flight technology, applied in the field of strain sensing, can solve the problems of complex laser locking and error signal detection process, poor dynamic range and reusability, etc., and achieve high-precision static strain and dynamic strain sensing. , cost-effective, high detection accuracy

Active Publication Date: 2017-10-13
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex process of laser locking and error signal detection, the dynamic range and reusability of this scheme are not good

Method used

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  • Strain sensing system and method based on flight time detection
  • Strain sensing system and method based on flight time detection
  • Strain sensing system and method based on flight time detection

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Embodiment 1

[0044] In this embodiment, the detection distance of the strain sensing system is less than 1 km, which is a local strain sensing system.

[0045] like figure 1 As shown, the local strain sensing system based on time-of-flight detection in this embodiment includes: a pulsed laser, an optical fiber beam splitter, a first optical fiber loop optical-microwave phase detector, a proportional-integral feedback control device, a microwave source, a strain The sensor, the second optical fiber loop optical-microwave phase detector and the data acquisition device; wherein, the pulse laser outputs the laser pulse sequence; it is divided into two parts by the optical fiber beam splitter, which are respectively the reference laser pulse sequence and the detection laser pulse sequence; the reference laser pulse sequence The pulse sequence is transmitted to the first optical fiber loop optical-microwave phase detector through the optical fiber, and the microwave signal output by the microwav...

Embodiment 2

[0050] In this embodiment, the strain sensing system performs remote detection, and the detection distance is more than 1 km, which is a remote strain sensing system.

[0051] like Figure 5 As shown, the remote strain sensing system based on time-of-flight detection in this embodiment includes: a local end part, an optical fiber circulator and a remote end part; wherein, the local end part includes a pulsed laser, first and second optical fiber loop light- Microwave phase detector, proportional-integral feedback control device, microwave source, first and second optical fiber amplifiers, first wavelength division multiplexer and data acquisition device; the remote part includes second wavelength division multiplexer, first reflector Mirror, strain sensor and second reflector; the pulse laser at the local end part outputs the laser pulse sequence; it is transmitted to the first port of the optical fiber circulator through the transmission fiber and the dispersion compensation ...

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Abstract

The invention discloses a strain sensing system and method based on flight time detection. According to the method, a microwave signal in synchronization with a reference laser pulse sequence and a detection laser pulse sequence passing through a strain sensor are both inputted to a second fiber loop light-microwave phase detector, and an error signal related to strain is acquired; the microwave signal is employed, so a measurement scope is large, the second fiber loop light-microwave phase detector is employed, so high detection precision is realized. High precision static strain and dynamic strain sensing is realized, and the relatively large dynamic scope is further realized; a free operation pulse laser device is employed, a complex laser stabilizing device and a signal processing algorithm are not needed, on the condition that similar resolution and the dynamic scope are realized, higher cost performance is realized; during remote monitoring strain, high resolution and the large dynamic scope are further both realized; in pulse laser, if mode locking laser is employed, wider spectrum can be realized, and excellent reusability can be realized.

Description

technical field [0001] The invention relates to strain sensing technology, in particular to a strain sensing system based on time-of-flight detection and a sensing method thereof. Background technique [0002] Fiber optic strain sensors have important applications in science and engineering due to their excellent robustness, flexibility, and sensitivity. In the past few decades, different kinds of optical strain sensors have emerged. For example, strain sensors based on Brillouin scattering can distributedly monitor the strain in optical fiber links with millimeter-scale spatial resolution and micro-strain strain resolution, and fiber Bragg grating-type strain sensors can dynamically monitor the strain at the micro-strain level. Within the range, static (less than 10Hz) strain measurement of nano-strain level and dynamic (greater than 10Hz) strain measurement of sub-piano strain level are realized. Due to high cost performance, good flexibility and strong anti-electromagne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 施可彬陆星金正元章双佑
Owner PEKING UNIV