Validation of Packaged Clad-Etched Fiber Bragg Grating as Underwater Acoustic Sensor

Investigation of membrane stress continuously adjustable fiber optic acoustic sensor based on inverse piezoelectric effect

“…Compared with distributed fiber optic acoustic sensors, point acoustic sensors, especially membrane-based fiber acoustic sensors, have attracted much attention because of their merits such as low cost, compact size, lightweight, and simple system [6,15,16]. Therefore, various types of fiber optic acoustic sensors based on a membrane have been proposed and studied intensively, including interferometer sensors such as Fabry-Perot interferometer [17], Michelson interferometer [18], and fiber grating sensors such as fiber Bragg grating [19], long-period fiber grating [20], wherein the membrane is a key component that determines the performance of sensors.…”

“…Up to date, most of membrane-based fiber optic acoustic sensor schemes usually focus on the optical fiber structure [17][18][19][20] or the material and size of membrane [18,[21][22][23]; meanwhile, the stress exerted on the membrane is neglected, which is also a crucial parameter affecting the response characteristics of sensors [24,25]. Since accurately controlling membrane stress is challenging during the fabrication process of membrane-based acoustic sensors, a few investigations and experiments have revealed the influence law of stress on the response mechanism of fiber optic acoustic sensors [24,26,27], which results in unstable and inconsistent response characteristics between different acoustic sensors.…”