We have to know what is acoustics and what is acoustic sensing before we can understand what acoustic sensing is. Acoustics is investigation of the the behavior of the pressure waves. According to this, sound is also a pressure wave travelling in the air.
Sensing is the processing of data in brain(or another data processor) which is gathered from the sensing organs. Acoustic sensing is the processing of the gathered pressure waves (which could be sound waves or vibrations in the earth) with a data processor. If we were to give an example to these; hearing a sound with our ear and then knowing that this sound is the singing of a bird or touching something and then understanding whether it is rough or smooth are fine examples of acoustic sensing.
Acoustic sensing refers to the use of sound waves to detect and measure physical properties or events. This technology is based on the principle that sound waves can travel through different mediums, including solids, liquids, and gases, and can be used to detect changes in these environments.
Acoustic sensing can be used in a wide range of applications, including in the fields of healthcare, environmental monitoring, and security. For example, in healthcare, acoustic sensing can be used to monitor breathing and heart rate, while in environmental monitoring, it can be used to detect changes in the ocean, such as the presence of underwater earthquakes or marine life.
One common form of acoustic sensing is sonar, which uses sound waves to detect objects underwater. Another application is acoustic emission testing, which uses sound waves to detect cracks or other structural defects in materials. Overall, acoustic sensing is a powerful technology that can provide valuable information across a wide range of applications.