Abstract
To address the issues of high time consumption of frame synchronization involved in a scanning-free Brillouin optical time-domain analysis (SF-BOTDA) system, a fast frame synchronization algorithm based on incremental updating was proposed. In comparison to the standard frame synchronization algorithm, the proposed one significantly reduced the processing time required for the BOTDA system frame synchronization by about 98%. In addition, to further accelerate the real-time performance of frame synchronization, a field programmable gate array (FPGA) hardware implementation architecture based on parallel processing and pipelining mechanisms was also proposed. Compared with the software implementation, it further raised the processing speed by 13.41 times. The proposed approach could lay a foundation for the BOTDA system in the field with the associated high real-time requirements.
Highlights
In recent decades, distributed Brillouin optical time domain analyzer (BOTDA) has been intensively investigated for a wide variety of applications, including temperature analysis [1,2] and structure health monitoring [3,4]
Due to the frequency-scanning nature, the acquisition time and post-processing time of most existing BOTDAs can vary from seconds to minutes when sensing ranges and spatial resolutions changes [7,8,9,10], which limits its development in the field of fast distributed monitoring systems, such as a vibration measuring system for long sensing range and high spatial resolution for civil or aeronautic structures applications [11,12]
In Ba et al [14], another kind of scanning-free BOTDA is proposed based on multiple probes and pump pairs that allows for the fast measurement of strain or temperature changes along the fiber
Summary
In recent decades, distributed Brillouin optical time domain analyzer (BOTDA) has been intensively investigated for a wide variety of applications, including temperature analysis [1,2] and structure health monitoring [3,4]. Due to the frequency-scanning nature, the acquisition time and post-processing time of most existing BOTDAs can vary from seconds to minutes when sensing ranges and spatial resolutions changes [7,8,9,10], which limits its development in the field of fast distributed monitoring systems, such as a vibration measuring system for long sensing range and high spatial resolution for civil or aeronautic structures applications [11,12]. In Ba et al [14], another kind of scanning-free BOTDA is proposed based on multiple probes and pump pairs that allows for the fast measurement of strain or temperature changes along the fiber. Jin et al proposed a digitally generated optical-frequency-comb-based
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