αALPHA-TAD120-LIGHT

ALPHA-TAD120-LIGHT

Product Overview

ALPHA-TAD120-LIGHT is a three component low noise feedback, DIGITAL OUTPUT velocity broadband seismometer designed by Dr. C.M. Güralp. In the 1970's and 1980's Dr. Güralp set out the standards for miniature surface and borehole broadband seismometers.

The Broadband Feedback seismometer is based on orthogonal three axis low noise sensor modules with double nested feedback loop topology. The suspension system is based on the principles of “elastica”. The mechanical sensor orientation is Non-Galperin with -75 dB cross axis rejection on all axis.

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GaiaCode - Broadband Seismometer ALPHA-TAD120-LIGHT

The ALPHA family sensors are a three components low noise feedback velocity output Broadband seismometer suitable for local, regional and teleseismic recording.

ALPHA-TAD120-LIGHT

Instrument Specifications

Suitability

  • Single or large scale seismic networks
  • Micro-seismic monitoring
  • After-shock monitoring
  • Volcanology
  • Hydrocarbon exploration
  • Permanent reservoir monitoring
  • Induced seismicity detection
  • Explosion monitoring
  • Post hole seismology
  • Micro-seismic monitoring

Benefits

  • High digital data quality broadband data
  • Covers complete seismic spectrum with a single transfer function
  • Particularly low noise at high frequencies compared to other broadband sensors
  • 8 Channel 24 Bit internal digitiser
  • PGA on all channels
  • Remotely configurable and controls sensor functions
  • Automatic centring based on mass position offset
  • Suspension system with high cross axis rejection
  • Broadband data with high frequency response extending to 150 Hz,
  • Automatic self-installation and zeroing for quick installation
  • Tilt tolerance of ±5 degrees
  • Portable and easy to deploy
  • Waterproof casing with connectors mated

ALPHA-TAD120-LIGHT

Key Features

The sensor frequency response covers complete seismic spectrum with a flat frequency response (no peaks) from 0.008333 Hz (120 seconds) to 150 Hz.

A precision 24 bit 8 channel digitiser is housed inside a waterproof enclosure.

The sensor noise level crosses (below) the New Low Noise Model (NLNM) from 18 Hz to 50 Seconds period.

Truly portable rugged seismometer with fine pitched adjustable feet manufactured from phosphor bronze.

Senser can be operated with ±5.0 degrees of tilt, and microprocessor controlled remote centering is provided.

Remote electronic mass locking and unlocking facility, with serial interface for sensor control and parametric sensor data.

Galvanically two stage isolated electronics. The sensor mechanical section and the feedback electronics sections have their own isolated and hermetically sealed enclosures.

The electronic and the mechanical sections of the sensor can be physically separated for observatory applications.

All outputs and digital inputs are transient protected.

Disclaimer: The product specifications and the stated data are subject to change without prior notice.

REFERENCES

Ref 1: 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 2: GURALP, C.M., “The Design of a Three-component Borehole Seismometer”, 1980. Ph.D. Thesis, Univ of Reading
Ref 3: 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 4; M,J, USHER and C.M. Guralp, “The design of miniature wideband seismometer” Geophys. J.R. ast. Soc. (1978)-55 (605-613)

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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]