Long-distance optical fiber vibration sensing system with distributed amplification

A vibration sensing system and long-distance optical fiber technology, applied in the field of sensing systems, can solve problems such as poor positioning accuracy, low sensitivity, and inability to meet border security, and achieve the effect of accurate positioning accuracy and high sensitivity

Inactive Publication Date: 2010-11-24
江西华神智能物联技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing perimeter security system has a small monitoring range, low sensitivity, and poor positioning accuracy, which cannot meet the needs of border security

Method used

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  • Long-distance optical fiber vibration sensing system with distributed amplification
  • Long-distance optical fiber vibration sensing system with distributed amplification
  • Long-distance optical fiber vibration sensing system with distributed amplification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the Raman pumped laser is forward pumped, please refer to figure 1 , A long-distance fiber optic vibration sensing system with distributed amplification, including seed laser, acousto-optic modulator, second isolator, circulator, fiber amplifier, filter, photoelectric converter, collector connected in sequence , And a signal processor, which further includes a Raman pump laser, a first isolator, and a wavelength division multiplexer connected in sequence, wherein the circulator is connected to the wavelength division multiplexer, and the signal processor is connected to the acousto-optic modulator The wavelength division multiplexer integrates the output light of the seed laser and the Raman pump laser and then enters one end of the sensing optical cable to form a forward pump.

[0024] The signal processor can send a starting signal to the acousto-optic modulator, which includes information such as modulation frequency and modulation width, so that the ...

Embodiment 2

[0027] In this embodiment, the Raman pumped laser is pumped backward, please refer to figure 2 , A long-distance fiber optic vibration sensing system with distributed amplification, including seed laser, acousto-optic modulator, fourth isolator, circulator, fiber amplifier, filter, photoelectric converter, collector connected in sequence , And a signal processor, which further includes the Raman pump lasers connected in sequence and a third isolator, wherein the circulator is connected to the fourth isolator, the fourth isolator is connected to one end of the sensing optical cable, and the third isolator The sensor is connected to the other end of the sensing optical cable, and the signal processor is connected to the acousto-optic modulator. The pump light output by the Raman pump laser and the pulse signal modulated after the output of the seed laser are input to the two ends of the sensing optical cable respectively to form a backward pump.

[0028] The signal processor can s...

Embodiment 3

[0031] In this embodiment, the Raman pumped laser is pumped bidirectionally, please refer to image 3 , A long-distance fiber optic vibration sensing system with distributed amplification, including seed laser, acousto-optic modulator, sixth isolator, circulator, fiber amplifier, filter, photoelectric converter, collector connected in sequence , And a signal processor, which further includes a Raman pump laser, a fifth isolator connected to the Raman pump laser, a coupler connected to the fifth isolator, and a wavelength division multiplexer connected to the coupler, In addition, the wavelength division multiplexer is connected to one end of the sensing optical cable, and the coupler is connected to the other end of the sensing optical cable, so that the pump light output by the Raman pump laser is input to both ends of the sensing optical cable to form a bidirectional pump.

[0032] The signal processor can send a starting signal to the acousto-optic modulator, which includes in...

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PUM

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Abstract

The invention discloses a long-distance optical fiber vibration sensing system with distributed amplification. The system comprises a Raman pump laser, a seed laser, a modulator connected with the seed laser, a circulator connected with the modulator, an optical fiber amplification filter connected with the circulator, a photoelectric transducer connected with the optical amplification filter, a collector connected with the photoelectric transducer, and a signal processor connected with the collector. The system has the advantages of capacity of monitoring long-distance border lines, high sensitivity and exact positioning accuracy.

Description

Technical field [0001] The invention relates to a sensing system, in particular to a long-distance optical fiber vibration sensing system with distributed amplification characteristics. Background technique [0002] The 21st century is the era of information technology. As an important means of information acquisition, sensor technology has attracted more and more attention and has been widely used in social life. From satellites and spacecrafts in aerospace, to cars and refrigerators in daily life, they all have sensors. [0003] With the development of semiconductor technology and modern optical communication technology, optical fiber sensors have gradually replaced traditional sensor types in some key areas due to their anti-electromagnetic interference, high sensitivity, and simple structure, such as electromagnetic sensors and resistive sensors. Wait. [0004] In the field of national defense and public safety, sensors play an important role, such as temperature sensors for fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 齐龙舟刘亮皋魏席刚仝芳轩周正仙
Owner 江西华神智能物联技术有限公司
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