CN102636201B - BOTDR (Brillouin Optical Time Domain Reflectometer) system device based on comb-like electric filter - Google Patents
BOTDR (Brillouin Optical Time Domain Reflectometer) system device based on comb-like electric filter Download PDFInfo
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- CN102636201B CN102636201B CN201210097809.1A CN201210097809A CN102636201B CN 102636201 B CN102636201 B CN 102636201B CN 201210097809 A CN201210097809 A CN 201210097809A CN 102636201 B CN102636201 B CN 102636201B
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Abstract
The invention relates to a BOTDR (Brillouin Optical Time Domain Reflectometer) system device based on a comb-like electric filter, comprising a narrow linewidth light source, a 1:2 coupler, an acousto-optic frequency shifter, an electro-optic modulator, an erbium-doped fiber amplifier, an optical circulator, a 3dB coupler, a balanced receiver, an electric filter and a computer. The narrow linewidth light source, the 1:2 coupler, the acousto-optic frequency shifter, the electro-optic modulator, the erbium-doped fiber amplifier and the optical circulator are connected in sequence; the 1:2 coupler and the optical circulator are respectively connected with the 3dB coupler; the 3dB coupler is connected with the balanced receiver; the balanced receiver is connected with the comb-like electric filter composed of multiple electric filters; and the comb-like electric filter is output to the computer for matching. The BOTDR system device has the technical effects of not only improving the space resolution of a BOTDR system and reducing the complexity of the BOTDR system, but also enhancing the dynamic property of the BOTDR system as well.
Description
Technical field
The present invention relates to a kind of BOTDR system and device based on pectination electrical filter.
Background technology
In the distributed Brillouin fiber optic sensing of time domain, mainly contain two class modes, a kind of is system based on stimulated Brillouin scattering, another kind is the system based on spontaneous brillouin scattering, the former is called BOTDA(full name is Brillouin optical time domain analysis technology), it is Brillouin light domain reflectometer that the latter is called BOTDR(full name).Than BOTDA, BOTDR system more easily realizes, and simple in structure, but measuring accuracy is low, and measuring distance is shorter.
In BOTDR, the measurement of temperature and strain is to realize by measuring power and the frequency displacement of spontaneous brillouin scattering.In BOTDR system, in order to measure Brillouin shift, generally adopt the modes such as the scanning of F-P chamber, edge filter, but the detection speed of these modes is all lower, and is only applicable to the situation of obvious peak value.When there is temperature/strain inhomogeneous in the resolving range being determined by pulse width, may there are a plurality of obvious peaks, also may only have an obvious peak.When only having an obvious peak, temperature/strain meeting larger on some spaces, zonule can't detect, thus the hidden danger of causing the accident.Therefore, traditional detection mode makes the detection rates of BOTDR system slower, and dynamic perfromance is poor, and spatial resolution is also limited simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of BOTDR system and device based on pectination electrical filter, this device not only can improve spatial resolution greatly, reduces the complexity of system, and can strengthen the dynamic perfromance of system.
The present invention is achieved like this, it comprises narrow linewidth light source, 1:2 coupling mechanism, acousto-optic frequency shifters, electrooptic modulator, Erbium-Doped Fiber Amplifier (EDFA), optical circulator, three-dB coupler, balanced reciver, electrical filter, computing machine, it is characterized in that narrow linewidth light source, 1:2 coupling mechanism, acousto-optic frequency shifters, electrooptic modulator, Erbium-Doped Fiber Amplifier (EDFA) is connected successively with optical circulator, 1:2 coupling mechanism is connected respectively three-dB coupler with optical circulator, three-dB coupler connects balanced reciver, balanced reciver connects the pectination electrical filter being formed by several electrical filters, pectination electrical filter outputs to computing machine and carries out matching.
Technique effect of the present invention is: this device not only can improve the spatial resolution of BOTDR system greatly, reduces the complexity of system, and can strengthen the dynamic perfromance of system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Narrow linewidth light source 2,1:2 coupling mechanism 3, acousto-optic frequency shifters 4, electrooptic modulator 5, Erbium-Doped Fiber Amplifier (EDFA) 6, optical circulator 7, three-dB coupler 8, balanced reciver 9, electrical filter 10, computing machine in the drawings, 1.
Embodiment
As shown in Figure 1, the present invention is achieved like this, narrow linewidth light source 1,1:2 coupling mechanism 2, acousto-optic frequency shifters 3, electrooptic modulator 4, Erbium-Doped Fiber Amplifier (EDFA) 5 and optical circulator 6 are connected successively, 1:2 coupling mechanism 2 is connected respectively three-dB coupler 7 with optical circulator 6, three-dB coupler 7 connects balanced reciver 8, balanced reciver 8 connects the pectination electrical filter being formed by several electrical filters 9, electrical filter 9 input computing machines 10.And to take the BOTDR system of the pump light pulse that adopts 10ns pulsewidth be example, the light signal of narrow linewidth light source output is divided into two, and a road is as pump light, and another road is as local oscillator light.Pump light through acousto-optic frequency translation device by pumping light frequency by
become
(
the frequency shifts that acousto-optic frequency translation device produces), through electrooptic modulator, be modulated into pulse signal afterwards, pulse signal is amplified into sensor fibre through image intensifer (Erbium-Doped Fiber Amplifier (EDFA)).From the spontaneous Brillouin's signal reflecting sensor fibre, enter balanced reciver together with local oscillator light.Normal temperature is without the Brillouin shift of strain single-mode optical fiber
be about 12.8GHz, brillouin gain spectrum spectrum width
be about 31.8GHz.If the frequency shifts value that acousto-optic frequency translation device produces is set
equal 12.672GHz, the crest frequency of the intermediate-freuqncy signal after heterodyne is
128MHz, the interval of pectination electrical filter is 10MHz, totally 21 electrical filters.The centre frequency of first electrical filter is 33MHz, and the centre frequency of last electrical filter is 233MHz.In a certain 10 cm range, there is the strain of 614.4 μ ε.
Now, the output spectrum by pectination electrical filter can obtain following data.
Above-mentioned data are carried out to matching with nonlinear least square method, and the matching time is 0.031s.Fitting result shows that the centre frequency of two curves is respectively 127.9999MHz and 167.9982MHz, the area that two curves and frequency axis enclose be respectively 0.90111 and 0.098889(area adopted normalizated unit).By the centre frequency of two curves, pass through relational expression
, can obtain
12.8GHz,
12.84GHz.Strain frequency displacement coefficient equals 0.0651MHz/ μ ε, if temperature does not change, corresponding strain is respectively 0 He
μ ε.Spatial resolution corresponding to 10ns pulse width is 1 meter, and therefore, two corresponding regions of curve are respectively
centimetre and
centimetre.Realized the spatial resolution of 10 centimetres.
Claims (1)
1. the BOTDR system and device based on pectination electrical filter, it comprises narrow linewidth light source, 1:2 coupling mechanism, acousto-optic frequency shifters, electrooptic modulator, Erbium-Doped Fiber Amplifier (EDFA), optical circulator, three-dB coupler, balanced reciver, pectination electrical filter, computing machine, it is characterized in that narrow linewidth light source, 1:2 coupling mechanism, acousto-optic frequency shifters, electrooptic modulator, Erbium-Doped Fiber Amplifier (EDFA) is connected successively with optical circulator, 1:2 coupling mechanism is connected respectively three-dB coupler with optical circulator, three-dB coupler connects balanced reciver, balanced reciver connects the pectination electrical filter being formed by several electrical filters, pectination electrical filter outputs to computing machine and carries out matching.
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| CN201210097809.1A CN102636201B (en) | 2012-04-06 | 2012-04-06 | BOTDR (Brillouin Optical Time Domain Reflectometer) system device based on comb-like electric filter |
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| CN201210097809.1A CN102636201B (en) | 2012-04-06 | 2012-04-06 | BOTDR (Brillouin Optical Time Domain Reflectometer) system device based on comb-like electric filter |
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| CN103884363B (en) * | 2014-04-02 | 2016-10-05 | 电子科技大学 | A kind of optical time domain reflectometer type optical fiber sensing system based on Brillouin amplification |
Citations (2)
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| CN101764646A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院半导体研究所 | Wavelength-encoding optical time domain reflection test device and measurement method thereof |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764646A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院半导体研究所 | Wavelength-encoding optical time domain reflection test device and measurement method thereof |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
Non-Patent Citations (4)
| Title |
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| 万生鹏等.基于布里渊散射的光纤传感系统性能分析.《传感技术学报》.2004,(第2期),第322-324页. |
| 万生鹏等.相干自外差电域扫描布里渊光纤传感系统方案设计及测量精度分析.《传感技术学报》.2004,(第3期),第458页第1栏第1行至第2栏第7行，图1. |
| 基于布里渊散射的光纤传感系统性能分析;万生鹏等;《传感技术学报》;20040630(第2期);第322-324页 * |
| 相干自外差电域扫描布里渊光纤传感系统方案设计及测量精度分析;万生鹏等;《传感技术学报》;20040930(第3期);第458页第1栏第1行至第2栏第7行，图1 * |
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Effective date of registration: 20230512 Address after: 211100 room 1613, building B5, Jiulong lake international enterprise headquarters park, No. 19, Suyuan Avenue, Jiangning District, Nanjing, Jiangsu Province (Jiangning Development Zone) Patentee after: Nanjing ruilanshi Photoelectric Sensor Technology Research Institute Co.,Ltd. Address before: 696 No. 330000 Jiangxi province Nanchang Honggutan Feng and South Avenue Patentee before: NANCHANG HANGKONG University |