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1. Product Overview（TDH-22 Seismic Hydrophone）
TDH-22 seismic hydrophone is specifically designed for low-frequency seismic signal acquisition, with an operating frequency range of 2 Hz to 50 kHz. It is particularly suitable for applications such as Ocean Bottom Cable (OBC), Ocean Bottom Node (OBN), and Deepwater Vertical Seismic Profiling (VSP). Its compact 25 mm diameter structure facilitates multi-element integration, while supporting operation at depths of up to 3000 meters. The product maintains stable sensitivity and capacitance characteristics over a wide range of temperatures and pressures, ensuring repeatability of data during long-term field operations.
2. Technical Specifications（TDH-22 Seismic Hydrophone）
2.1 Environmental and Mechanical Parameters
(1) Operating temperature (in air): 0 °C to +50 °C
(2) Storage temperature: -40 °C to +70 °C
(3) Max. operating depth: 3000 m
(4) Mechanical resonance frequency: > 50 kHz
(5) Dimensions: 25 mm diameter × 40 mm molded/vulcanized length
(6) Housing Material: Molded/vulcanized acoustically transparent rubber (seawater corrosion resistant)
(7) Cable Interface: Standard watertight cable, customizable length
2.2 Electroacoustic Performance
(1) Operating frequency range: 2 Hz to 50 kHz
(2) Static capacitance: 10.0 nF ±10%
(3) Capacitance temperature coefficient: ≤ 0.5%/°C
(4) Capacitance Change vs. Pressure: ≤20% (within operating depth); ≤5% upon return to atmospheric pressure
(5) Voltage sensitivity: -199 dB ±1.5 dB re 1V/μPa
(6) Sensitivity temperature coefficient: < ±0.25 dB / 10 °C
(7) Sensitivity Change vs. Depth: ≤3.5 dB (within operating depth); ≤±0.7% upon return to atmospheric pressure
(8) Sensitivity variation with frequency: ≤ ±1.5 dB
(9) Insulation resistance: ≥ 1000 MΩ
3. Typical Applications（TDH-22 Seismic Hydrophone）
(1) Ocean Bottom Cable (OBC): Used as hydrophone array elements to record seabed seismic wavefields (especially low-frequency surface and body waves)
(2) Ocean Bottom Node (OBN): Forms four-component (4C) nodes when combined with three-component geophones
(3) Deepwater Vertical Seismic Profiling (VSP): Used in downhole or seabed receivers for reservoir characterization
(4) Natural Seismic Monitoring: Fixed or temporary seabed seismic arrays
(5) Low-frequency Acoustic Measurements: Scientific research applications such as marine ambient noise and geoacoustic inversion
