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An acoustic release is an oceanographic device for the deployment and subsequent recovery of instrumentation from the sea floor, in which the recovery is triggered remotely by an acoustic command signal.〔University of Rhode Island http://www.dosits.org/gallery/tech/bt/ar1.htm〕 A typical ''release'' consists of the hydrophone (see dark gray cap in the figure), the battery housing (long gray cylinder), and a (red) hook which is opened to release the anchor by high-torque electrical motor. == Method of operation == * Deployment phase: The instrument package is dropped to the sea floor. The principal components of the package are the ''anchor weight'' which allows the assembly to sink and then remain firmly on the sea floor, the ''acoustic release device'' which can receive a remote commands from the control station to drop the anchor weight, the ''instrument or payload'' which is to be deployed and later recovered, and a ''flotation device'' which keeps the assembly upright on the sea floor, and at the end of the deployment allows it to return to the surface. * Operations phase: The instrument package is on the sea floor. This phase can last anywhere from minutes to several years, depending on the application. The instrument package is now typically unattended, performing its observations or work. * Recovery phase: During this phase, an acoustic command is issued by the control station. The ''control station'' is typically on a boat, but may also be a device operated by a diver or mounted on an ROV. Upon receipt and verification, the acoustic release triggers a mechanism that drops the ''anchor weight''. The remainder of the instrumentation package is now carried back to the surface by the ''flotation device'' for recovery. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Acoustic release」の詳細全文を読む スポンサード リンク
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