Application Cases

Experiment Name: Application of Power Signal Source in Frequency Response Experimental Verification for the Development of Multi-Frequency Resonance Hydrophone

Experiment Objective:
Current hydrophones are mostly broadband, but increasing the sensitivity across the entire frequency band often involves high costs and complex fabrication processes. Therefore, there is a need for a high-sensitivity hydrophone with an easily tunable operating frequency band. Based on the acoustic resonance principle of a closed air cavity with rigid walls, a multi-frequency resonant cavity hydrophone was designed.

Experimental Equipment: NI data acquisition card, ATG-2041 power signal source, power supply board, transducer, hydrophone, etc.

Experimental Procedure:

1. Hydrophone Fabrication:
   The designed resonant cavity hydrophone encapsulates a microphone chip circuit within a hollow spherical shell. The hollow spherical shell was fabricated using 3D printing technology with photosensitive resin, which has good acoustic transparency. The microphone was fixed inside the sphere, and the signal pins were extended out through a hole at the top of the sphere using long wires. A schematic diagram and a photograph of the hydrophone fabrication are shown in the figure.

   

   Figure: Schematic Diagram and Photograph of Hydrophone Fabrication

2. Experimental Platform Setup:
   The experimental platform is shown in the figure. An excitation signal was generated by an upper computer via a data acquisition card. The signal was amplified by an ATG-2041 power signal source and then input to a transducer for transmission. The fabricated hydrophone was placed at a certain distance from the transducer. The signal received by the hydrophone was acquired by the data acquisition card and sent to the upper computer for processing, yielding the measured frequency response curve.

   

   Figure: Experimental Setup

Experimental Results:
During the experimental measurements, it was observed that the frequency response of the transducer was not flat, as shown in the figure. Therefore, normalization was required to eliminate the influence of the transducer and the microphone on the hydrophone's frequency response. After processing, the actual frequency response curve of the hydrophone was obtained.

Figure: Specifications of the ATG-2000 Series Power Signal Source