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Fast demodulation device of optical fiber invasion signals on basis of Brillouin scattering

A technology of Brillouin scattering and demodulation device, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems that the optical fiber intrusion strain detection cannot be applied, cannot meet the real-time requirements of the optical fiber intrusion strain detection, etc. The effect of spatial positioning accuracy, low dark current and fast measurement

Active Publication Date: 2013-11-20
HANGZHOU INSTITUTE OF OPTICS AND FINE MECHANICS
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Problems solved by technology

Therefore, for the Brillouin optical fiber sensing system using the signal demodulation method of frequency step scanning, the speed of signal demodulation is usually on the order of tens of seconds, which cannot meet the real-time requirements of optical fiber intrusion strain detection, and cannot be applied to Optical fiber intrusion strain detection occasions

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  • Fast demodulation device of optical fiber invasion signals on basis of Brillouin scattering
  • Fast demodulation device of optical fiber invasion signals on basis of Brillouin scattering
  • Fast demodulation device of optical fiber invasion signals on basis of Brillouin scattering

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0017] see figure 1 , figure 1 It is a structural block diagram of a fast demodulation device for optical fiber intrusion signals based on Brillouin scattering in the present invention, which consists of a high-speed PIN photodetector 1, a first SMA connector 2, a low noise amplifier 3, a second SMA connector 4, a belt Pass filter 5, third SMA connector 6, microwave downconverter 7, fourth SMA connector 8, edge filter 9, fifth SMA connector 10, edge filter control circuit 11, serial port connection line 12, intermediate frequency detection device 13, coaxial shielded signal line 14, data acquisition card 15, PCI data bus 16, computer 17 and serial port connection line 18, and its connection relationship is: the output end of described high-speed PIN photodetector 1 and low-noise amplifi...

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Abstract

The invention discloses a fast demodulation device of optical fiber invasion signals on the basis of Brillouin scattering. The fast demodulation device consists of a high-speed personal identification number (PIN) photoelectric detector, a first sub-miniature-A (SMA) connector, a low-noise amplifier, a second SMA connector, a band-pass filter, a third SMA connector, a microwave lower frequency converter, a fourth SMA connector, an edge filter, a fifth SMA connector, an edge filtering control circuit, a control signal transmission wire, a middle-frequency wave detector, an axial shielding signal wire, a data collecting card, a peripheral component interconnection (PCI) data bus, a computer and a serial port connecting wire. The fast demodulation device has the advantages that the real-time demodulation of the optical fiber invasion signals on the basis of the Brillouin scattering can be realized, the structure is simple, and the response is fast.

Description

technical field [0001] The invention relates to optical fiber sensing, in particular to a fast demodulation device for optical fiber intrusion signals based on Brillouin scattering, which can be used for fast signal demodulation in optical fiber intrusion sensing systems and optical fiber strain sensing systems. Background technique [0002] In the traditional distributed optical fiber intrusion sensing system, the main sensing principle is based on optical phase interference technology and fiber grating technology. The intrusion sensing system based on optical phase interference technology has high sensitivity, but the long sensing distance and high spatial positioning accuracy cannot be realized at the same time. The usual sensing distance is on the order of several kilometers, and the spatial positioning accuracy is ±50 meters order of magnitude. The intrusion sensing system based on fiber grating technology can only realize point measurement, or expand the measurement r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 胡佳成陈福昌张承涛陈宇李国扬林尊琪
Owner HANGZHOU INSTITUTE OF OPTICS AND FINE MECHANICS
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