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Seismological solution GEMINI-2

Seismological solution GEMINI-2
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GEMINI-2 is a compact solution for HVSR, MASW and Vibration Analysis: a single waterproof case with an integrated low frequency, high performing 3D geophone assembly (2Hz) properly coupled sensors) and a powerful true 24 bit data acquisition board with USB port for external PC. 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. Created as an instrument mainly dedicated to HVSR measurements, GEMINI-2 can be used for other passive applications like vibration analysis. Completed with the appropriate accessories, it may become an active seismic acquisition system (3 channels + trigger) for MASW and "unconventional" applications.

Specifications

SENSOR GEMINI-2
Nat. Resonance freq 2 Hz ± 10%
Sensitivity 2 V/cm•S-1 ± 5% 
Internal resistance 5.8 kΩ ± 5% 
Damping 0.7 ± 10% 
Harmonic distortion ≤ 0.2% 
Input impedance  ≥ 10 MΩ 
Operating temperature  from –25°C to +55°C 
Sensor clamping  automatic when not in use 
Dimensions  diam. 128 mm h. 175mm 
Weight  2.4 Kg 
DATA ACQUISITION BOARD
Power supply / Data Recording via USB port on an external PC (supplied by the Customer) 
Data Conversion  true 24 bit A/D Sigma-Delta converter  
Sampling rate  max. Freq. 8ksps, simultaneously on 3+1 channels 
S/N ratio  max 117 db 
Bandwidth +/- 0.1 dB  108 Hz @ 1ksps 
Bandwidth –3 d  212 Hz @ 1ksps 
Number of channels  3 + 1 (trigger) 
Data Format  SAF (Sesame ASCII Format) / SEG2 (.dat) 
Manufacturer code: GEMINI-2
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