Long Range Raman-Amplified Distributed Acoustic Sensor Based on Spontaneous Brillouin Scattering for Large Strain Sensing.
Long Range Raman-Amplified Distributed Acoustic Sensor Based on Spontaneous Brillouin Scattering for Large Strain Sensing.
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DOI:
10.3390/s22052047
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发表时间:
2022-03-06
期刊:
影响因子:
--
通讯作者:
Brambilla G
中科院分区:
文献类型:
--
作者:
Bakhtiari Gorajoobi S;Masoudi A;Brambilla G
A Brillouin distributed acoustic sensor (DAS) based on optical time-domain refractometry exhibiting a maximum detectible strain of 8.7 m and a low signal fading is developed. Strain waves with frequencies of up to 120 Hz are measured with an accuracy of 12 at a sampling rate of 1.2 kHz and a spatial resolution of 4 m over a sensing range of 8.5 km. The sensing range is further extended by using a modified inline Raman amplifier configuration. Using 80 ns Raman pump pulses, the signal-to-noise ratio is improved by 3.5 dB, while the accuracy of the measurement is enhanced by a factor of 2.5 to 62 at the far-end of a 20 km fiber.
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