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A kind of OFDR detection device

A detection device and photodetector technology, which is applied in the field of optical fiber, can solve the problem that the OFDR system is difficult to accurately compensate abnormal frequency points, and achieve the effects of quick compensation and improved adaptability

Active Publication Date: 2022-05-06
芯华创(武汉)光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention designs an OFDR detection device with an auxiliary interferometer with adjustable delay capability, which solves the problem that it is difficult to accurately compensate abnormal frequency points in the OFDR system

Method used

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  • A kind of OFDR detection device
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  • A kind of OFDR detection device

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Experimental program
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Embodiment 1

[0029] Combine below figure 1 The specific structure of a kind of OFDR detection device of the present invention is illustrated:

[0030] Including: frequency-sweeping light source, first beam splitter, main interferometer, first photodetector, adjustable delay auxiliary interferometer, second photodetector and data processing module,

[0031] The light outlet of the frequency-sweeping light source is connected to the light inlet of the first beam splitter by an optical fiber, the first light outlet of the first beam splitter is connected to the light inlet of the main interferometer by an optical fiber, and the light outlet of the main interferometer is connected to the first photodetector The optical fiber is connected between the optical splitter, the second light outlet of the first beam splitter and the light inlet of the adjustable delay auxiliary interferometer are connected by an optical fiber, and the light outlet of the adjustable delay auxiliary interferometer and t...

Embodiment 2

[0046] In addition to providing an OFDR detection device as described in Embodiment 1, the present invention also provides a OFDR detection method, which can be applied to the detection device as described in Embodiment 1. Therefore, in the present invention For the elaboration of the characteristics of the corresponding method steps in the embodiment, the corresponding execution subject can be found in embodiment 1, such as image 3 As shown, the method includes:

[0047] S1: Perform time-frequency domain conversion on the beat frequency signal of one sweep period collected on the main interferometer to obtain the frequency domain data sequence of the main interferometer,

[0048] S2: Screen the data whose frequency domain amplitude is higher than the preset threshold in the frequency domain data sequence as the main interferometer abnormal frequency point data sequence, and the main interferometer abnormal frequency point data sequence contains abnormal frequency points corr...

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Abstract

The present invention relates to the field of optical fiber sensing, in particular to an OFDR detection device, comprising: a frequency-sweeping light source, a first beam splitter, a main interferometer, a first photodetector, an adjustable delay auxiliary interferometer, and a second photodetector and the data processing module, the light outlet of the sweeping light source is connected to the light inlet of the first beam splitter, the first light outlet of the first beam splitter is connected to the light inlet of the main interferometer, and the light outlet of the main interferometer is connected to the first photoelectric The connection between the detectors, the connection between the second light exit port of the first beam splitter and the light entrance port of the adjustable delay auxiliary interferometer, the connection between the light exit port of the adjustable delay auxiliary interferometer and the second photodetector, the first The photodetector is connected to the data receiving end of the data processing module, and the second photodetector is connected to the data receiving end of the data processing module. Because the device adopts an adjustable delay auxiliary interferometer, it can measure the phase noise of different frequency points under different time delays, thereby compensating the phase noise of different abnormal frequency points.

Description

【Technical field】 [0001] The invention relates to the field of optical fibers, in particular to an OFDR detection device. 【Background technique】 [0002] With the wide application of optical fiber links, the demand for fault detection equipment in long-distance optical fiber links is gradually increasing. [0003] In order to solve the problem of fault location in long-distance optical fiber links, OFDR (Optical frequency domain reflectome) distributed optical fiber sensing technology is usually used for fault detection. However, traditional OFDR distributed optical fiber sensing equipment will have a frequency offset due to problems such as phase noise interference, making the positioning of reflection points or scattering points inaccurate. The currently used OFDR detection device uses a fixed delay auxiliary interferometer to compensate for phase noise, which can only compensate for a fixed delay value, and cannot adjust the delay according to changes in phase noise for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/00
CPCG01M11/30
Inventor 赵灿吴昊曹孟辉宋雷
Owner 芯华创(武汉)光电科技有限公司