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Adaptive compensation measurement method for different measurement lengths in OFDR system

A measurement method and detector technology, which are applied to measurement devices, instruments, and optical devices to transmit sensing components, etc., can solve the problems of poor compensation effect, poor spatial resolution, slow operation speed, etc. The effect of small amount of algorithm data and simple algorithm

Active Publication Date: 2022-04-19
NANJING UNIV
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Problems solved by technology

The deskewing filter method is suitable for long-distance measurement, but when the nonlinearity is large, the compensation effect is not good
[0004]Currently, the traditional method has the problems that the measurement distance is limited by the delay fiber length of the auxiliary interferometer, the spatial resolution is poor, and the calculation speed is slow. Measurements that maintain high spatial resolution and high computing speed

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  • Adaptive compensation measurement method for different measurement lengths in OFDR system
  • Adaptive compensation measurement method for different measurement lengths in OFDR system
  • Adaptive compensation measurement method for different measurement lengths in OFDR system

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Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

[0036] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] fig...

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Abstract

The invention discloses a self-adaptive compensation measurement method for different measurement lengths in an OFDR (Optical Frequency Domain Reflectometer) system. The non-linear tuning effect of a laser can be self-adaptively corrected. The self-adaptive correction process comprises the following steps: firstly, measuring an auxiliary interferometer signal and a main interferometer signal containing nonlinear information, then extracting a nonlinear frequency sweep curve of a light source from the auxiliary interferometer signal, and according to different positions of an optical fiber reflection point needing to be measured, performing corresponding time shifting on the frequency sweep curve and making a difference between the frequency sweep curve and an original frequency sweep curve, so as to obtain the non-linear frequency sweep curve. According to the invention, nonlinear frequency sweep correction signals under time delays matched with different positions can be obtained, so that main interferometer signals at different positions of an optical fiber to be measured can be optimally compensated, and long-distance and high-spatial-resolution distributed optical fiber sensing measurement is realized.

Description

technical field [0001] The invention relates to a method for improving the measurement range and spatial resolution in an optical frequency domain reflectometer system, in particular to an adaptive compensation measurement method for different measurement lengths in an OFDR system, which belongs to the field of distributed optical fiber sensing. Background technique [0002] Optical Frequency Domain Reflectometer (OFDR) is an important technology in distributed optical fiber sensing, which was first proposed and proved by Eickhoff et al. With the maturity of OFDR technology, it is gradually applied to the measurement of parameters such as temperature, strain, vibration and electromagnetic field. In the optical frequency domain reflectometry system, the output light of the tunable light source (TLS) is divided into two beams, one beam is the reference beam, and the other beam is the probe beam. The Fresnel reflected light and backscattered light from the optical fiber to be ...

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35361
Inventor 王峰孙莹夏益华陈强张旭苹张益昕
Owner NANJING UNIV
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