Tianle Chen, Zhou Xu, Lei Tu, Liang Wang, Ming Tang
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引用次数: 0
Abstract
In addition to laser frequency sweep nonlinearity, sensing point misalignment caused by a random laser frequency sweep range (LFSR) is a key factor limiting the sensing performance of the optical frequency domain reflectometer (OFDR). Here we propose a synchronous equal frequency resampling (SEFR) method for the first time to our knowledge to simultaneously compensate both the random LFSR and sweep nonlinearity. A new linear frequency sequence has been constructed to perform signal resampling of both the reference and measurement stages, which eliminates the sensing point misalignment and nonlinear frequency interval at the same time. Thus the sensing distance and accuracy of both phase demodulation (PD) and cross-correlation demodulation (CD)-based OFDR have been greatly improved in distributed strain measurement. For PD, with SEFR the sensing distance is extended to 70 m, and the strain root mean square error (RMSE) is reduced by 16 times under the worst LFSR difference of 579.4 MHz. For CD, the sensing distance is extended from 6.8 m to 70 m, and the RMSE is reduced by 41 times when using SEFR under the worst LFSR difference.
期刊介绍:
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.