Table 1 Comparison of the dual-channel demodulation and single-channel demodulation principles
From: Physics and applications of Raman distributed optical fiber sensing
Schemes | Advantages | Characteristics |
|---|---|---|
Dual-channel demodulation | (1) Eliminates the influence of optical source fluctuations. (2) It is suitable for engineering due to the stable measurement performance. | The fiber dispersion affects the measurement accuracy performance. |
Single-channel demodulation | (1) The SNR and temperature accuracy performances are relatively better. (2) Simple device and easy to install. | The unstable light source affects its temperature accuracy performance. |
