SIGMA

The SIGMA family of robust Force Balance Accelerometers rounds off Gaiacode's suite of seismic instrumentation. Based on a newly designed sensor with a truly rectilinear suspension of the inertial mass, SIGMA instruments have a flat response to ground motion over a very large frequency range. With their exceptional performance, SIGMAs are suitable for local and regional strong motion recordings and for earthquakes engineering applications.

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SIGMA Standard Version

SIGMA Standard

The standard product of the SIGMA family of FBAs is a three component analogue instrument, capable of measuring ground accelerations of up to 4g. It is designed to be deployed in vaults or shallow surface installations. Packaged in a rugged vessel of anodized aluminium its three components are oriented in the classical orthogonal configuration.

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SIGMA Digital

SIGMA Digital

The SIGMA digital is an easy to use digital output force balance accelerometer. It is based on a SIGMA Standard seismometer mated with a 8-channel, 24-bit TAU digitizer. Together these units are housed inside a waterproof enclosure of anodized aluminium. The 8-channel 24-bit digitiser exploits the high dynamic range exceeding 170 dB of the truly rectilinear sensors forming a perfect portable digital accelerometer.

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SIGMA Downhole

SIGMA Downhole

The SIGMA Downhole is a slim line three component accelerometer, packaged in a stainless steel housing, sealed with double O-rings. Its stacked three sensors are based a inertial masses with truly rectiliniear suspension systems. It is versatile, as it can be used as a posthole or a borehole instrument, rated for wet boreholes down to a depth of 300 m, depending on the type of cabling and connectors used.

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References

  • Ref 1 USHER, M.J., BURCH, R.F. and GURALP, C.M., “Wide-band Feedback Seismometers”, 1979. Physics of the Earth and Planetary Interiors, 18: 38-50.
  • Ref 2 M,J, USHER and C.M. Guralp, “The design of miniature wideband seismometer” Geophys. J.R. ast. Soc. (1978)-55 (605-613) ,
  • Ref 3 GURALP, C.M., “The Design of a Three-component Borehole Seismometer”, 1980. Ph.D. Thesis, Univ of Reading.
  • Ref 4 GURALP C.M. Patent Application, No: 7909579 Filed: 19th March 1979 (declaration priority from Appln No: 10279/78 Filed: 15th March 1978) “Vertical Seismometer”.
  • Ref 5 GURALP C.M. United States Patent Application Number: 4,280.206 March 1979. SEISMOMETERS.
  • Ref 6 GURALP C.M. UK Patent Application GB 2-144-287-A. July 1983 Analog-to-digital converters for Seismometers. The National Research Development Corporation (UK)
  • Ref 7 GURALP C.M. UK Patent Application No. 1900719.4; Title: Infrasound Detector [M&S-IRN.FID4315516]