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Hybrid response seismometer

ED is involved in the design of a hybrid response seismometer. Response and channel sensitivity are designed for PS27. So far, two seismometers have been produced by Guralp and testing took place in Q1 2010 at NORSAR (Norway) test sites.
The main benefit lies in improved response composed of a combination of portions of the pass-band, flat in velocity, and portions of the pass-band, flat in acceleration, optimizing utilization of dynamic range for recording high-frequency and low-frequency signals. It is fully compliant with IMS minimum specifications

Learn more about the response of the hybrid seismometer.

LN2 generator

A major contributor to downtime of particulate radionuclide stations is failure of the detector's electrical cooling system. Liquid nitrogen is the most reliable detector coolant but its supply can be limited, especially in remote areas, presenting logistical difficulties. One of alternative cooling systems under study is the small-scale (4 to 6 liters per day) liquid nitrogen generator, Elan2 (MMR Technologies). Currently the equipment is being tested at RN47 Kaitaia, New Zealand and RN26 Fiji. There are plans to test the Elan2 at other particulate stations.
For further information on the testing of LN2 generator, please see LN2 testing presentation

IMS digitizer

As engineering support to supply chain management of one of the main system components in the IMS waveform stations, digitizers, ED collaborates with manufacturers in continuous development of the new IMS digitizer.

Portable infrasound array

ED, in a cross-divisional project, has developed and has started deploying a portable infrasound array to improve the contribution of infrasound detections at IMS stations into the Reviewed Event Bulletin (REB).

The portable array will be mainly used at site or calibration surveys or for the study of local events.
Currently the system is built and it is ready to be deployed in Chile for first experiment in volcanic region. Main features of the Portable Array are:

  • Easy and rapid deployment;
  • Autonomous power supply and sufficient digitizer's internal memory, which allows independent operation for months;
  • Robust design, suitable for deployment in almost all kind of environment;
  • Measurement simultaneously acoustic and seismic signals, as well as 3-axis wind speed (horizontal and vertical turbulences), temperature and speed of sound in the air.

Portable infrasound calibrator

ED has developed an portable infrasound calibrator (see pictures ). It is designed as portable, easy to be deployed, field calibrator. Suitable for fast in-situ calibration of IMS infrasound stations. The technique is based on a "piston" pulse calibration (fast injection of a known volume of air to the microbarometer under the test). A production prototype, based on the bench prototype, has been designed and ordered. A production unit is expected to be ready by June 2011.

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