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Gemini 2 Hz

3D Land Geophone-HVSR-MASW-Holisurface Gemini 2 Hz

category:Seismic / 3D Land Geophone-HVSR-MASW-Holisurface
brand:PASI
item:Gemini 2 Hz
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...NOT ONLY HVSR

Gemini-2 is a compact device for HVSR, MASW and Vibration Analysis: a single waterproof case with an integrated low frequency, high performing 3D-geophone assembly (with real 2Hz sensors properly coupled) and a powerful true 24 bit data acquisition board with USB port for external PC. 

Supported by its versatility and the easy to use user interface, GEMINI 2 with all its accessories allows you to perform the following surveys:

  • HVSR
  • SURFACE WAVES
  • ACTIVE SEISMICS
  • VIBRATION ANALYSIS & MONITORING
  • Holisurface® (data processing with third-party software)

Through Gemini USB interface and the related data acquisition software your PC becomes a perfect, high performance instrument for both data recording and post-processing analysis.
GPS option also guarantees georeferencing and timing of the Gemini; additional Gemini units can be further synchronized.

 

Data acquisition board specifications:

Power supply: through USB port

Sampling rate: from 20Hz to 8000 Hz

A/D Sigma-Delta converter resolution: 24 real Bit

Record time: from 60’’ to 30’ 

Acquisition channels: No. 3 + 1AUX

S/N ratio at fs=1KHz: 117 dB

S/N ratio at fs=8KHz: 109 dB

Passband at fs=1KHz: 110 Hz, proportional to sampling rate

 

Gemini-2 Sensors Specifications: 

Nat. Frequency: 2 Hz +/-10%

Sensibility: 2 V/cm•S-1 +/- 5% 

Internal Resistance: 5.8kΩ +/-5% 

Damping: 0.7 +/-10% 

Harmonic Distortion: ≤ 0.2% 

Insulating Resistance:≥ 10 MΩ 

Working Temp.: from -25°C to + 55°C 

Sensor clamping: automatic when not in use

Physical Dimensions: diam.128mm, h.175mm 

Weight: 2.4 kg