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Optical fiber-wireless mixed type sensing monitoring system

A monitoring system and hybrid technology, applied in the field of optical fiber sensing and wireless sensor networks, can solve the problems of high power loss, difficulty in realizing small volume and high integration wireless optical fiber sensing, and high cost, and achieve the effect of stable performance.

Inactive Publication Date: 2012-10-03
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the optical interference demodulation or wavelength detection device of the existing wireless optical fiber sensing system is large in volume, high in cost and large in power loss, and it is difficult to realize small volume and highly integrated wireless optical fiber sensing, and provides a A Fiber-Wireless Hybrid Sensing Monitoring System

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  • Optical fiber-wireless mixed type sensing monitoring system
  • Optical fiber-wireless mixed type sensing monitoring system
  • Optical fiber-wireless mixed type sensing monitoring system

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specific Embodiment approach 1

[0008] Specific implementation mode one: combine figure 1 Describe this embodiment, the optical fiber-wireless hybrid sensing monitoring system described in this embodiment, it is made up of pump light source 1, isolator 3, wavelength division multiplexer 4, multi-longitudinal mode fiber laser sensor 5, photodetector 6 , No. 1 amplifier 7, No. 2 amplifier 10, wireless transmitter 8, wireless receiver 9 and frequency meter 11. The output end of the pump light source 1 is connected to the input end of the isolator 3 through the transmission fiber, the output end of the isolator 3 is connected to the input end of the wavelength division multiplexer 4 through the transmission fiber, and the signal exchange end of the wavelength division multiplexer 4 Connected to the signal exchange end of the multi-longitudinal-mode fiber laser sensor 5, the output end of the wavelength division multiplexer 4 is connected to the input end of the photodetector 6 through the transmission fiber, and...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment is a further limitation of the optical fiber-wireless hybrid sensing and monitoring system described in Embodiment 1. The pumping light source 1 adopts 980nm or 1480nm pumping light source.

specific Embodiment approach 3

[0013] Specific implementation mode three: combination figure 2 Describe this embodiment. This embodiment is a further limitation of the optical fiber-wireless hybrid sensing and monitoring system described in Embodiment 1. The multi-longitudinal mode fiber laser sensor 5 adopts an annular cavity multi-longitudinal mode fiber laser sensor. The longitudinal mode fiber laser sensor is composed of a fiber grating 12 , a coupler 13 and an erbium-doped fiber 14 , and the coupler 13 is connected in series in the optical path between the fiber grating 12 and the erbium-doped fiber 14 .

[0014] The pumping light enters the annular cavity through the fiber grating 12 and the coupler 13, propagates in the clockwise and counterclockwise directions, is amplified through the erbium-doped optical fiber 14, and returns to the fiber grating 12 through the coupler 13, and the fiber grating 12 realizes The selection of specific wavelength light within the reflection bandwidth, and then the op...

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Abstract

The invention relates to an optical fiber-wireless mixed type sensing monitoring system relating to the technical field of optical fiber sensing networks and wireless sensing networks and aiming at solving the problems of large size, high cost, high power consumption, difficult realization of small-size and high-integration wireless optical fiber sensing of an optical interference demodulation or wavelength detection device of the traditional wireless optical fiber sensing system. The optical fiber-wireless mixed type sensing monitoring system comprises a pump light source, an isolator, a wavelength division multiplexer, a multi-longitudinal mode optical fiber laser sensor, a photoelectric detector, a No.1 amplifier, a No.2 amplifier, a wireless transmitting device, a wireless receiving device and a frequency meter, wherein the pump light source is connected to the input end of the isolator; the isolator is connected with the wavelength division multiplexer; and the wavelength division multiplexer is connected with the multi-longitudinal mode optical fiber laser sensor. In the invention, an optical demodulation part in the technology does not needs the huge optical interference demodulation or wavelength detection device, and the demodulation of an optical fiber sensor can be realized by utilizing the photoelectric detector and the frequency meter, and therefore, an all-electronic demodulation-wireless transmission process is realized; and in addition, the invention is suitable for the technical field of the optical fiber sensing networks and the wireless sensing networks.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensor and wireless sensor network. Background technique [0002] Due to its advantages of anti-electromagnetic interference, small size, light weight, corrosion resistance, and intrinsic explosion-proof, optical fiber sensing has become an ideal sensing element for strong electromagnetic interference, harsh environments, small volume, and large-scale sensing applications. Widely used in health monitoring in important fields such as highways, railways, bridges, dams, ships, oil drilling, and large aircraft. However, the on-site deployment and maintenance of optical fiber sensing is troublesome, and the sensing distance is limited by the loss of optical fiber, the maximum is only 100km, and ultra-long-distance real-time monitoring cannot be realized. The wireless sensor has the advantages of a huge wireless network, and can flexibly intervene in the wireless sensor network to achieve ultra-l...

Claims

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Application Information

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IPC IPC(8): G01D5/353
Inventor 刘盛春丁树春李坤于秀娟张云龙
Owner HEILONGJIANG UNIV
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