AI Article Synopsis
- The study presents an advanced distributed acoustic sensor that utilizes time-frequency-multiplexing (TFM) with optical frequency domain reflectometry (OFDR) for improved spatial resolution.
- TFM enhances the frequency response and reduces crosstalk, while high sensitivity is achieved through phase demodulation and end effects are mitigated using linear interpolation.
- Experimental results demonstrate the system's effectiveness, measuring a 10.5 kHz vibration with a spatial resolution of 22 cm and good performance at a 33 kHz vibration with a sampling rate up to 200 kHz over a 1 km fiber.
Article Abstract
We proposed and experimentally demonstrated a high-spatial-resolution distributed acoustic sensor based on time-frequency-multiplexing (TFM) optical frequency domain reflectometry (OFDR). The TFM technique enhances the frequency response of OFDR by multiplexing the time-frequency channels and suppresses the crosstalk in the meantime. Phase demodulation is employed to achieve high sensitivity, and the impact of end effect in OFDR is studied and suppressed by a dedicated linear interpolation. In the results, a 10.5 kHz vibration is measured with 22 cm spatial resolution and 20 dB signal-to-noise ratio on a 1 km fiber. By adjusting the parameters, the system also shows a good DAS performance on a 33 kHz vibration with up to 200 kHz sampling rate.
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| http://dx.doi.org/10.1364/OL.501253 | DOI Listing |
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