| Autor: |
Yongkang Dong, Dexin Ba, Taofei Jiang, Dengwang Zhou, Hongying Zhang, Chengyu Zhu, Zhiwei Lu, Hui Li, Liang Chen, Xiaoyi Bao |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
IEEE Photonics Journal, Vol 5, Iss 3, Pp 2600407-2600407 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
1943-0655 |
| DOI: |
10.1109/JPHOT.2013.2267532 |
| Popis: |
We demonstrate a high-spatial-resolution fast Brillouin optical time-domain analysis (BOTDA) for distributed dynamic strain measurement based on differential double-pulse and second-order sideband of modulation. The frequency-agility probe wave is obtained from the second-order sideband of the modulated light by using the microwave signal from a wideband arbitrary waveform generator (AWG), which reduces the bandwidth requirement of the AWG by half to ~ 5.5 GHz. The differential double-pulse scheme is proposed to improve the spatial resolution while keeping the capability of dynamic measurement. In experiment, a spatial resolution of 20 cm is achieved by using a 52/50 ns differential double-pulse, and the distributed vibration measurement is demonstrated over a 50-m Panda polarization-maintaining fiber observing the vibration frequency of up to 50 Hz. With only five averages, the standard deviation of the strain accuracy is measured to be 14 με. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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