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DH-4059 Broadband Digital Hydrophone 

Integrated Underwater Acoustic Sensing, High-Speed Digitization & Precision Network Sync( 20 Hz to 200 kHz )​​

The DH-4059 combines a high-sensitivity acoustic element with onboard signal processing in a compact, subsea-rated enclosure. Designed to eliminate analog cable signal degradation, it converts acoustic inputs directly at the sensor node using a 24-bit ADC with sampling rates up to 512 ksps across a 20 Hz to 200 kHz frequency band.

With 100 Mbps Fast Ethernet, IEEE 1588 (PTP) clock synchronization, and onboard MicroSD logging up to 2TB, the DH-4059 operates as a standalone autonomous recorder or a real-time node in synchronized hydrophone arrays.

DH-4059 Broadband Digital Hydrophone

DH-4059 Digital Hydrophone  

Key Features

  • Integrated Digital Architecture: Built-in 0 dB pre-amplifier and 24-bit ADC digitize audio at the sensor face, avoiding signal attenuation and EMI over long cable runs.
  • Wide Dynamic Range: Configurable gain (-20 dB to +40 dB) paired with a 220 dB re 1 µPa maximum SPL limit prevents clipping during high-amplitude acoustic events while capturing low-level ambient noise.
  • Microsecond-Level Array Sync: Hardware-supported IEEE 1588 (PTP) and NTP protocols enable sub-microsecond clock alignment across networked units for TDOA source localization and beamforming.
  • Dual-Mode Operation: Supports real-time Ethernet streaming or self-contained logging using internal MicroSD storage (up to 2TB) powered via 12 VDC (1.6 W typical consumption).
  • Subsea Hardware: Encapsulated in polyurethane rubber and TC4 titanium or 316L stainless steel, rated for 300 m working depths with standard 8-pin wet-mateable connectors.

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Specifications

Category Parameter Specification
Acoustics Frequency Range 20 Hz to 200 kHz
Receiving Sensitivity -215 ± 3 dB re 1 V/µPa
Max SPL (Clipping Limit) 220 ± 3 dB re 1 µPa
Digitization & Processing Sampling Rate Up to 512 ksps
ADC Resolution 24‑bit
Configurable Gain -20 dB, 0 dB, 20 dB, 30 dB, 40 dB
Pre‑amplifier 0 dB gain
Power & Interface Interface 100 Mbps Fast Ethernet
Synchronization IEEE 1588 (PTP) / NTP
Internal Storage MicroSD (Up to 2TB)
Supply Voltage 12 VDC (with voltage monitoring)
Power Consumption 1.6 W (Typical)
Mechanical Acoustic Element Size φ18.5 mm × H105 mm
Housing Size φ50 mm × H170 mm
Weight (in Air) Element: 60 g / Main Housing: 500 g
Materials Polyurethane rubber, TC4 Titanium Alloy / 316L Stainless Steel
Depth Rating 300 m (Custom options available)
Connector Standard 8‑pin wet‑mateable connector

Applications


  • Passive Acoustic Monitoring (PAM) 
    Marine mammal whistle and click detection; biological baseline surveys.
  • Ocean Environmental Acoustics  
    Continuous ambient soundscape measurement and vessel noise characterization.
  • Hydrophone Array Deployments 
    Synchronized multi-channel arrays for acoustic tracking and localization.
  • Offshore Industrial Monitoring 
    Real-time noise compliance verification during marine construction and pile driving.

Typical Sensitivity Curve (without preamplifier)

Typical Sensitivity Curve (without preamplifier)-DH-4059 Digital Hydrophone

Horizontal Directivity Curve

-3 dB Beamwidth 30 kHz-DH-4059 Broadband Digital Hydrophone

-3 dB Beamwidth: 360° @ 30 kHz

-3 dB Beamwidth 200 kHz-DH-4059 Broadband Digital Hydrophone

-3 dB Beamwidth: 360° @ 200 kHz

-3 dB Beamwidth 100 kHz-DH-4059 Broadband Digital Hydrophone

-3 dB Beamwidth: 360° @ 100 kHz ​

Vertical Directivity Curve

-3 dB Beamwidth 300° @30 kHz-DH-4059 Broadband Digital Hydrophone

-3 dB Beamwidth: 300° @ 30 kHz

-3 dB Beamwidth 280° @20 0kHz-DH-4059 Broadband Digital Hydrophone

-3 dB Beamwidth: 280° @ 200 kHz

-3 dB Beamwidth 290° @100 kHz-DH-4059 Broadband Digital Hydrophone

-3 dB Beamwidth: 290° @ 100 kHz

Documents


DH-4059 Digital Hydrophone Datasheet