Interference fading suppression with a multi-subcarrier pulse in a distributed acoustic sensor.
Opt Express
; 32(11): 20230-20241, 2024 May 20.
Article
en En
| MEDLINE
| ID: mdl-38859138
ABSTRACT
A low-complexity multi-subcarrier pulse generation scheme is proposed to suppress the interference fading in a phase-sensitive optical time-domain reflectometer (Φ-OTDR) based distributed acoustic sensor (DAS) with heterodyne coherent detection. The multi-subcarrier pulse is generated in the digital domain based on the proper clipping operation of a sine signal. The localization and recovery of the disturbance signal are realized by the spectrum extraction and rotated vector sum (SERVS) method. The experimental results show that the occurrences of interference fading can be significantly reduced. The intensity fluctuation is reduced from â¼75 dB to â¼25 dB. Multiple disturbance signals are successfully demodulated to verify the effectiveness of the proposed method.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Opt Express
Asunto de la revista:
OFTALMOLOGIA
Año:
2024
Tipo del documento:
Article
Pais de publicación:
Estados Unidos