Dual-wavelength one-way annular distributed optical fiber sensing and positioning system
A distributed optical fiber, sensing and positioning technology, applied in the direction of transmitting sensing components, converting sensor output, and measuring devices with optical devices, can solve the problems of increased positioning errors and signal errors, to improve accuracy and ensure similarity sexual effect
Active Publication Date: 2021-08-31
FUDAN UNIV
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Distributed optical fiber sensors can be used to locate disturbances that occur at any point on the sensing line. The existing interferometric distributed optical fiber sensors that use the time delay estimation method to locate disturbances generally require two signal phases in the positioning algorithm. The subtraction operation may introduce a certain error in the signal during the subtraction process, resulting in an increase in the positioning error
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[0056] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0057] The dual-wavelength unidirectional ring-type distributed optical fiber sensing and positioning system of the present invention is as follows: figure 1 As shown, the wide-spectrum light source used in the system is a superluminescent light-emitting diode (SLD), with a center wavelength of 1550nm. The first optical isolator eliminates optical reflection, and four photodetectors are used for photoelectric conversion. The role of the interference unit is to make light interfere in it, and convert the light phase change in the sensing light path into light intensity change. One of its possible structures is as follows figure 2 As shown, the interior is composed of 3×3 fiber couplers, fiber delay lines, and 2×2 fiber couplers. Its light injection interface is used to connect the laser, two light detection interfaces are used to connect T...
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The invention belongs to the technical field of optical fiber sensing, and particularly relates to a dual-wavelength one-way ring type distributed optical fiber sensing positioning system. The system comprises a light source part, a light detection part and a light interference part, wherein the light interference part comprises an interference unit, two dual-wavelength transceiver modules and two sensing optical cables. According to the invention, distributed optical fiber sensing and positioning are realized by using the dual-wavelength one-way ring interferometer, cross-correlation operation is directly performed on two demodulated phase signals to obtain time delay between the two paths of signals, so that the distance between a disturbance generation position and the dual-wavelength transceiver module is calculated, and then through the relative relation between the cross-correlation peak value position and the center position, the sensing optical cable on which disturbance occurs is judged, and finally disturbance positioning is realized. Compared with a traditional interference type long-distance distributed sensing system, the interference type long-distance distributed sensing system does not need to subtract signals in the aspect of a positioning algorithm, so that the similarity of the two signals used for cross-correlation calculation is guaranteed, and the disturbance positioning precision is improved.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a dual-wavelength unidirectional ring type distributed optical fiber sensing positioning system and an algorithm. Background technique [0002] Distributed optical fiber sensors have many advantages such as anti-electromagnetic interference and suitable for harsh environments, and can be used in perimeter security, oil pipeline leakage monitoring and other fields. Distributed optical fiber sensors can be used to locate disturbances that occur at any point on the sensing line. The existing interferometric distributed optical fiber sensors that use the time delay estimation method for disturbance location generally require two signal phases in the positioning algorithm. The subtraction operation may introduce a certain error in the signal during the subtraction process, resulting in an increase in the positioning error. The dual-wavelength one-way ring-ty...
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IPC IPC(8): G01D5/353
CPCG01D5/35322
Inventor 肖倩贾波胡雨晗彭和阔
Owner FUDAN UNIV