A kind of OFDR detection method
A detection method and abnormal technology, applied in the field of OFDR detection, can solve the problem that the OFDR system is difficult to accurately compensate for abnormal frequency points, and achieve the effect of quick compensation and improved adaptability
Active Publication Date: 2021-04-13
芯华创(武汉)光电科技有限公司
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[0004] In view of the above defects or improvement needs of the prior art, the present invention designs an OFDR detection method with an auxiliary interferometer with adjustable time delay, which solves the problem that it is difficult to accurately compensate abnormal frequency points in the OFDR system
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention 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 invention, not to limit the present invention.
[0036] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other. The present invention will be described in detail below with reference to the drawings and embodiments.
[0037] Such asfigure 1 As shown, the present invention provides a kind of OFDR detection method, and described OFDR detection method comprises the following steps,
[0038] S1: Perform time-frequency domain conversion on the beat frequency signal of one sweep period collected on the ...
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The present invention relates to the field of optical fiber sensing, in particular to an OFDR detection method, the steps of which include: performing time-frequency domain conversion on a beat frequency signal of one frequency sweep period to obtain a frequency domain data sequence, and performing threshold value judgment on the frequency domain data sequence, Obtain the abnormal frequency point data sequence of the main interferometer whose frequency domain amplitude is higher than the preset threshold, calculate the time delay corresponding to each abnormal frequency point in the abnormal frequency point data sequence, adjust the time delay of the adjustable delay interference arm in turn, and detect And demodulate to obtain the phase signal data sequence of the auxiliary interferometer with adjustable delay at different time delays, use the phase signal data sequence to calculate the auxiliary reference signal data sequence corresponding to each abnormal frequency point, and calculate the abnormal frequency point data sequence of the main interferometer The corrected frequency value corresponding to each frequency point in . The invention utilizes setting the time delay value of the adjustable delay interference arm on the adjustable delay auxiliary interferometer to perform precise phase noise compensation for specific abnormal frequency points on the optical fiber.
Description
【Technical field】 [0001] The invention relates to the field of optical fiber sensing, in particular to an OFDR detection method. 【Background technique】 [0002] With the widespread use of optical fiber links, the demand for health status detection of 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 frequency shift due to phase noise interference and other issues, making the positioning of reflection points or scattering points inaccurate. The currently used OFDR detection device uses a fixed time-delay auxiliary interferometer to compensate for phase noise, which can only compensate for a fixed time-delay value, and cannot adjust the time-delay according to changes in phase noise for...
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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