Gaiacode attending Three scientific conferences

17 Jun 2024

In June, August and September 2024, Gaiacode will be attending three scientific conferences.

Gaiacode’s next conference in June of 2024 will be at the Asia Oceania Geosciences Society (AOGS) conference. Moving into August, Gaiacode will also be attending the International Geological Congress (IGC). Finally, in September, Gaiacode will be presenting and exhibiting at European Seismological Commission General Assembly (ESC GA). At all the conferences, Gaiacode will be presenting its full product and software range as well as launching new instrumentation.

The first new instrument is ‘PICO’, a compact, ‘plug and play’ fully tilt-tolerant feedback sensor to be installed in all environments. The second new instrument is ‘LAMBDA’, a new patented very low noise and wideband feedback infrasound sensor bringing a new design to the industry. Come and discuss all of Gaiacode’s existing product range along with new sensors and the latest ideas in measurement techniques and systems.

PICO - Compact, fully tilt-tolerant feedback sensor
LAMBDA - Feedback infrasound sensor
AOGS event logo

AOGS 2024 in Pyeongchang, Gangwon-do, Republic of Korea

On June 24th to 28th 2024, AOGS is holding its 21st annual meeting organised to promote Geosciences. AOGS2024 is one of the largest geosciences conferences in Asia and brings experts from around the world. Gaiacode will be demonstrating its full product range as well as presenting new instrumentation named ‘PICO’ and ‘LAMBDA’. Gaiacode will be in attendance with Kit Valley, Gaiacodes exclusive distributor for the Republic of Korea. Come visit our booth, A03 to see our new advances in instrumentation.

IGC in Busan, Republic of Korea

For the first time, Gaiacode has a booth at the IGC on the 25th to 31st of August. Our team will be demonstrating our product line, discussing our new instrumentation and future developments in seismic instrumentation. Gaiacode will be in attendance with Kit Valley, presenting all of our latest developments in seismic instrumentation. Please come visit our booth, A41.

ESC event logo

ESC GA in Corfu, Greece

Gaiacode will be attending and presenting at the ESC GA in Corfu from the 22nd to 27th of September.

Gaiacode will be presenting a paper, contributing to common knowledge, on the “precision calibration of seismic sensors“. This is the ESC’s 39th general assembly with participants from over 60 countries expected to be in attendance. Gaiacode will also be exhibiting at the conference, showing its full product range and latest updates.

Please click below to read the abstract for Gaiacodes paper.

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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]

Precision Calibration of Seismic Sensors

Seismic feedback sensors offer a unique opportunity to perform precision calibration on such devices.

At their core is an inertial mass attached to a suspension system with one degree of freedom. The position and the motion of the mass are detected by a primary transducer, usually a capacitor or a linear variable displacement transformer (LVDT). In addition, the inertial mass has a secondary transducer, typically a coil/magnet arrangement which converts the electronic information generated by the feedback loop into a mechanical restoring force acting on the mass.

At Gaiacode we use the coil constant of the feedback coil as the main parameter for calibrating all our broad-band sensors, which have a high loop-gain. The first calibration step is to tilt the sensors (both vertical and horizontal) on a precision tilt table. Using an 8.5 digit multimeter and precision angle measurement we can calculate the coil constant in units of A/m/s2 with an accuracy of better than 1 part in 10000.

Knowing the coil constant we then inject a wide range of frequencies into the coil using a high precision signal generator and measure the reaction of the mass to this input using the primary transducer.

This procedure gives us a precise measurement of the sensor's output sensitivity value or its frequency response in amplitude and phase, depending on the type of calibration signal injected. In addition, these measurements also evaluate the system linearity and the total harmonic distortion to ground signals.

In this paper we describe the details of this calibration technique and give examples of measurements for systems with responses both in velocity and acceleration.

Author: Cansun Guralp (Gaiacode)