High Sensitivity 20Hz-50kHz Underwater Spherical Hydrophone with Preamplifiers

High Sensitivity 20Hz-50kHz Underwater Spherical Hydrophone with Preamplifiers

1. The standard hydrophone has the following characteristics:

1. Good directionality. The hydrophone has no directivity horizontally, and no directivity within 240° of the vertical plane.

2. High sensitivity and flat response.

3. Good stability and high reliability. The hydrophone has good temperature, pressure, and time stability, and the hydrophone has high reliability and is suitable for underwater acoustic calibration.

2. The main technical indicators of standard hydrophones:

Operating frequency range: 20Hz～50kHz

Linear frequency range: 20Hz～20kHz

Low frequency receiving sensitivity: -193dB

Horizontal directivity: ±1.5dB (50kHz)

Vertical directivity: ±2.0dB (50kHz, 240° range)

Maximum working depth: 500 meters

3. Directivity diagram of typical frequency (5dB per grid) 

     50kHz horizontal directivity                        50kHz vertical directivity

4.sensitivity curve of Free-field open circuit voltage:

5. the external dimensions and the definition of the core wire at the end of the cable

Definition of the core wire at the end of the cable: red wire-signal +; black wire-signal -; shielded wire-ground wire; the standard length of the cable is 15 meters

6. HSRHS-30 is a standard hydrophone with built-in preamplifier, which has the following advantages:

1. Suitable for long-distance signal transmission. The preamplifier converts the high impedance of the piezoelectric element into low impedance, greatly reducing the coupling loss caused by long cables and reducing the geomagnetic interference during transmission.

2. The sound pressure sensitivity can be adjusted as needed. By adjusting the gain of the preamplifier, the sound pressure sensitivity of the hydrophone can be changed to meet the needs of actual measurement.

3. Main technical indicators: fixed gain plus 20dB (built-in amplifier), if you need to adjust 0~50 dB, you can also configure a preamplifier.

Adjustable preamplifier: general voltage amplifier, single-ended input, single-ended output, output uses a standard BNC socket, the amplifier is connected to the  hydrophone, provides power for the hydrophone, receives the output signal of the hydrophone, amplifies it, and then plays a filtering role. Amplifier operating frequency: 1KHz~50 KHz, 0~50 dB adjustable, the step value is 10dB.

Main technical parameters of pre-amplifier ：