Hydrophone circuit with electrical characteristics of a geophone

Hydrophone group sensitivity tester

Hydrophone preamplifier control unit

Impedance and common mode rejection testing of a multi-channel s

In situ calibration of a sensor

Integrated acoustic network

Integrity assessment of ground anchorages

Intrusion detector operating mode selection system

Inverse method to measure the breathing wave speed in a liquid-f

Laboratory test method to measure towed array hydrophone respons

Low-frequency sound source for towed array condition appraiser s

Method and a device for reproducing solid body vibrations...

Method and a system for testing capacitive, acoustic transducers

Method and apparatus associated with a microcomputer system for

Method and apparatus for accurately determing the location of si

Method and apparatus for controlling an immersed multisource arr

Method and apparatus for detecting and correcting the positions

Method and apparatus for detecting orientation of downhole geoph

Method and apparatus for high-frequency passive sonar...

Method and apparatus for hydrophone array fault detection...