TYPE 8105

Spherical Hydrophone

Spherical hydrophone with rugged construction capable of withstanding pressures of up to 9.8 MPa (100 atm; 1000 m (3250 ft) ocean depth) and featuring exceptional directional characteristics.

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Type 8105 is a robust spherical hydrophone usable down to 1000 m ocean depth with excellent directional characteristics.


  • Calibration reference standards 
  • Ultrasonic measurements in liquids 
  • Cavitation measurements 
  • Laboratory and industrial measurements in liquids and gases 
  • As underwater projectors (8103, 8104 and 8105) 
  • Noise measurements in humid and polluted atmospheres
A small, spherical transducer for making absolute sound measurements over the frequency range 0.1Hz to 160 kHz with a receiving sensitivity of −205 dB re 1V/μPa. It is rugged, being capable of withstanding pressures of up to 107 Pa (100 atm.; 1000 m (3250 ft.) ocean depth).

This hydrophone has excellent directional characteristics: at 100 kHz, it is omnidirectional over 360° in the x-y (radial) plane and 270° in the x-z (axial) plane.
Voltage sensitivity with cable at 20°
56 uV/Pa ± 15 uV
Charge sensitivity
Capacitance with integral cable
Frequency range re. 250 Hz
0.1Hz to 100 kHz (+1/−6.5 dB) / 0.1Hz to 160 kHz (+3.5/−10.0 dB)
Operating temperature range short-tem continuous
-30 to +80
Max operating static pressure
260 dB = 9.8 × 10^6 Pa
93 mm (3.66 inch)
Weight including integral cable
1.6 kg (3.5 lb)
Integral cable
10 m waterblocked low-noise shielded cable to MIL-C-915 with BNC plug