Table 5 Comparison and analysis of SNR improvement methods based on Raman distributed optical fiber sensing
From: Physics and applications of Raman distributed optical fiber sensing
Scheme Types | Advantages | Characteristic | Representative Results |
|---|---|---|---|
Pulse Coding | It can effectively improve the SNR and sensing distance at the same time. | An extra expense and complex for practical application. | 3.9 °C @ 39.0 km92, Figures of merit: 10; °C @ 1.0 km91, Figures of merit: 10; |
Algorithm Denoising | Operation process is simple. Reduce the number of averaging and optimize the measurement time of the system. | Some useful signals may be filtered out. | 2.7 °C @ 30.0 km98, Figures of merit: 11.11 |
Rayleigh Optical Noise Suppression | Operation process is simple. | It cannot eliminate electrical noise, and needs to be used in combination with other denoising methods. | 1.7 °C @ 9.1 km109, Figures of merit: 5.35, |
Noise Suppression in the Demodulation Stage | The calibration process is omitted, and operation is simple. | It needs to be used in combination with other denoising methods. | 0.18 °C @ 17.0 km111, Figures of merit: 94.4 |
