Hydrophone BC 311 is a robust spherical compact hydrophone for absolute measurements of the sound spreading in actuating medium. The hydrophone has first-class characteristics in all geometry directions. It has omnidirectional characteristics in angular range, 270° wide in the x-z plane, and 360° in the x-y plane.
The hydrophone BC 311 can operate as a sound projector as well as be used to measure sound spreading in liquid, and in the course of reciprocity calibration. The fact is that the hydrophone piezoelectric sensing element has a reversibility effect. Mechanical stimulation leads to forming of an electric signal and vice-versa —alternative current voltage applied to sensing element leads to stimulation of mechanical oscillations. The figure shows the hydrophone BC 311 frequency curves. The presented data refers to 1-meter radiation distance. The curve inclination is typical for hydrophones with piezoelectric sensing elements.