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High-performance dynamic distributed optical fiber sensor based on Brillouin and Rayleigh dual mechanisms
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A distributed optical fiber, high-performance technology, applied in the optical field, can solve the problems of increasing cumulative error, affecting measurement accuracy, low strain resolution, etc., to achieve the effect of high-precision measurement
Active Publication Date: 2020-11-03
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problem of low strain resolution of the system based on Brillouin scattering in the existing scattering optical fiber sensor, in which the cumulative error of the system based on Rayleigh scattering will continue to increase during the demodulation process, which will affect the measurement accuracy. Thus providing a high-performance dynamic distributed fiber optic sensor based on the Brillouin and Rayleigh dual mechanisms
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specific Embodiment approach 1
[0025] Specific implementation mode one: combine Figure 1 to Figure 3 Describe this embodiment in detail. The high-performance dynamic distributed optical fiber sensor based on the Brillouin and Rayleigh dual mechanisms described in this embodiment includes a laser, a first electro-optic modulator, a frequency-agile module, a second electro-optic modulator, a pulse module, a first filter 1, an erbium-doped fiber amplifier 2, a circulator 3, a second filter 4, an isolator 5, two detectors and an acquisition module;
[0026] The wavelength of laser output from the laser is 1550nm, and the output laser is divided into 2 paths, one path of light is used to generate pump light for frequency-shifted pulses, and the other path of light is directly used as probe light;
[0027] The one path of light is modulated by the first electro-optic modulator into an optically agile frequency signal light with upper and lower sidebands, the second electro-optic modulator pulse-modulates the sig...
specific Embodiment approach 2
[0033] Specific implementation mode two: combination Figure 4 This embodiment is described in detail. This embodiment is a further description of the high-performance dynamic distributed optical fiber sensor based on the Brillouin and Rayleigh dual mechanisms described in the first embodiment. In this embodiment, it also includes a microwave source, a second 3 electro-optic modulators and a third filter 7;
[0034] The other path of light is modulated by the third electro-optic modulator into signal light with a fixed frequency shift of 10.6 GHz, the upper and lower sidebands, the third filter 7 filters out the lower sidebands, and then enters the isolator 5 .
[0035] Then, the one path of light only needs to be modulated by SSB to generate an optical frequency-agile signal of 100-500 MHz, so as to reduce the bandwidth of the frequency-agile module to hundreds of megahertz.
specific Embodiment approach 3
[0036] Specific embodiment three: This embodiment is a further description of the high-performance dynamic distributed optical fiber sensor based on Brillouin and Rayleigh dual mechanisms described in specific embodiment one or two. In this embodiment, the frequency-agile module and / or Or the pulse module is replaced by an arbitrary waveform generator.
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Abstract
The invention discloses a high-performance dynamic distributed optical fiber sensor based on Brillouin and Rayleigh double mechanisms, relates to a high-performance dynamic distributed optical fiber strain sensing technology based on the Brillouin and Rayleigh double mechanisms, and aims to solve the problems that the measurement precision is influenced because accumulated errors of a Rayleigh scattering-based system are increased continuously in a demodulation process, and a Brillouin scattering-based system is low in strain resolution. One path of light is modulated into optical frequency-agile signal light of upper and lower sidebands of a pulse through an electrooptical modulator, the upper sideband is filtered out through a first filter, then the optical frequency-agile signal light is amplified by an erbium-doped optical fiber amplifier to serve as pump light, and the pump light is input from one end of a to-be-tested optical fiber; the other path of light is input from the otherend of the to-be-tested optical fiber; and stimulated Brillouin scattering and Rayleigh scattering occur in the to-be-tested optical fiber, Brillouin scattering signals and Rayleigh scattering signals are separated through a second filter, two detectors detect the Brillouin scattering signals and the Rayleigh scattering signals respectively, and an acquisition module acquires output signals of the detectors. The distributed optical fiber sensor is suitable for distributed optical fiber strain sensing.
Description
technical field [0001] The invention belongs to the field of optics, and in particular relates to a high-performance dynamic distributed optical fiber strain sensing technology based on Brillouin and Rayleigh dual mechanisms. Background technique [0002] The volume of large-scale infrastructure in my country ranks among the top in the world. However, large-scale infrastructure has been eroded by external forces and the environment for a long time during its service, and disasters are very likely to occur, resulting in serious safety accidents and economic losses. In order to avoid casualties and reduce economic losses, large-scale infrastructure needs to be monitored. However, large-scale infrastructure such as highways, tunnels, large bridges, oil and gas pipelines, and power lines have long space dimensions. Point sensors based on resistive strain gauges and fiber gratings can only measure limited discrete points, and cannot realize the measurement of the object under tes...
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