Three-dimensional Low Frequency Vector Hydrophone for Vibration Velocity

     Three-dimensional Low Frequency Vector Hydrophone for Vibration Velocity

  This series of vector hydrophones, also called three-dimensional co-oscillating spherical vector hydrophones, is a hydrophone that is sensitive to sound pressure gradients and can distinguish incident sound waves from different directions on the same acoustic axis. As a new type of underwater acoustic transducer, it can provide information on the velocity of particles in the underwater sound field, and has advantages that conventional hydrophones cannot match. Therefore, it can enable researchers to have a more comprehensive understanding of the sound field and promote the study of underwater acoustic physical properties. In particular, the superior low-frequency cosine directivity can enable it to obtain higher gain at a small aperture.

 Features:

The three-dimensional isochronous spherical vector hydrophone adopts a piezoelectric acceleration sensor with a built-in conditioning circuit as the core design. The amount of electricity generated by the sensor is very small, and the generated electrical signal is easily interfered by noise. Therefore, the signal needs to be amplified and conditioned. Highly sensitive electronic devices are integrated in the conditioning circuit to make it as close as possible to the sensitive components to ensure better anti-noise performance and easier to meet the packaging and sealing process requirements.

The new vector hydrophone contains three mutually orthogonal vector channels (X, Y, Z) and an omnidirectional sound pressure channel (P). Each direction of the vector channel uses an acceleration sensor mentioned above, which is installed on a common base. The internal structure diagram is shown in Figure 1.

Specification:

Vector channel and sound pressure channel;

Linear frequency range: 20Hz-1000Hz;

Diameter: 200mm;

Vector channel sound pressure sensitivity: ≥-180dB (1kHz);

Sound pressure channel receiving sensitivity: ≥-180dB (1kHz);

Directivity: The lateral suppression ratio of the vector channel is greater than 26dB, and the sound pressure channel is omnidirectional;