BOTDR (Brillouin Optical Time Domain Reflectometer) system device based on comb-like electric filter
An electrical filter and comb technology, applied in the field of BOTDR system devices, can solve the problems of limited spatial resolution, poor dynamic characteristics, hidden dangers of accidents, etc., and achieve the effects of improving spatial resolution, reducing complexity and enhancing dynamic characteristics.
Active Publication Date: 2012-08-15
南京瑞蓝世光电传感技术研究院有限公司
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Problems solved by technology
When there is only one distinct peak, spatially larger temperatures / strains in some small areas will go undetected, creating an accident hazard
Therefore, the traditional detection method makes the detection rate of the BOTDR system slow, the dynamic characteristics are poor, and the spatial resolution is also limited.
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[0009] Such as figure 1 As shown, the present invention is realized in this way, the narrow-linewidth light source 1, 1:2 coupler 2, acousto-optic frequency shifter 3, electro-optic modulator 4, erbium-doped fiber amplifier 5 and optical circulator 6 are connected in sequence, 1: 2 The coupler 2 and the optical circulator 6 are respectively connected to the 3dB coupler 7, and the 3dB coupler 7 is connected to the balanced receiver 8, and the balanced receiver 8 is connected to a comb electric filter formed by several electric filters 9, and the electric filter 9 inputs computer10. Taking the BOTDR system using pump light pulses with a pulse width of 10ns as an example, the optical signal output by the narrow linewidth light source is divided into two, one is used as pump light, and the other is used as local oscillator light. The frequency of the pump light is changed from becomes ( It is the frequency shift generated by the acousto-optic frequency shifting device), and...
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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 [0001] The invention relates to a BOTDR system device based on a comb electric filter. Background technique [0002] In time-domain distributed Brillouin fiber sensing, there are mainly two types of methods, one is a system based on stimulated Brillouin scattering, and the other is a system based on spontaneous Brillouin scattering. The former is called BOTDA ( The full name is Brillouin Optical Time Domain Analysis Technology), and the latter is called BOTDR (full name is Brillouin Optical Time Domain Reflectometer). Compared with BOTDA, BOTDR system is easier to implement and has a simple structure, but its measurement accuracy is low and its measurement distance is short. [0003] In BOTDR, temperature and strain are measured by measuring the power and frequency shift of spontaneous Brillouin scattering. In the BOTDR system, in order to measure the Brillouin frequency shift, methods such as F-P cavity scanning and edge filtering are generally used, but t...
Claims
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Inventor 万生鹏何兴道
Owner 南京瑞蓝世光电传感技术研究院有限公司