Acoustic sensing has two modes: Distributed sensing and point sensing. In point sensing, we can only get the data from a single point of the sensor whereas in distributed sensing the whole fiber cable is a sensor and the data could be gathered along the cable.

Distributed acoustic sensing (DAS) is a sensing technology that uses fiber optic cables to detect sound waves and vibrations along the entire length of the cable. This technology offers several benefits, including:

Continuous monitoring: DAS can provide continuous monitoring over long distances, making it suitable for applications such as pipeline monitoring, border security, and earthquake detection.
High sensitivity: DAS can detect very small changes in acoustic signals and vibrations, making it useful for detecting subtle changes in the environment.
High spatial resolution: DAS can provide highly detailed information on the location of acoustic events, making it useful for applications such as seismic imaging, oil and gas reservoir monitoring, and traffic monitoring.
Cost-effectiveness: DAS can be cost-effective compared to traditional sensing technologies, as it uses existing fiber optic cables and requires minimal maintenance.
Flexibility: DAS can be used in a wide range of applications, including geophysical exploration, structural health monitoring, and security, making it a highly flexible sensing technology.

Overall, DAS is a powerful sensing technology that offers several benefits over traditional sensing technologies, making it an attractive option for a wide range of applications.