Articles | Volume 36
Adv. Geosci., 36, 27–30, 2013
https://doi.org/10.5194/adgeo-36-27-2013
Adv. Geosci., 36, 27–30, 2013
https://doi.org/10.5194/adgeo-36-27-2013

  11 Oct 2013

11 Oct 2013

Extending a Lippmann style seismometer's dynamic range by using a non-linear feedback circuit

G. Romeo and G. Spinelli G. Romeo and G. Spinelli
  • Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy

Abstract. A Lippmann style seismometer (Lippmann and Gebrande, 1983) uses a single-coil velocity-feedback method in order to extend toward lower frequencies a geophone's frequency response. Strong seismic signals may saturate the electronics, sometimes clipping the signal or producing the characteristic whale-shaped recording.

Adding a non linear feedback in the electronic circuit may avoid saturation, allowing the strong-motion use of the seismometer without affecting the usual performance. Such a seismometer will allow unsaturated data in epicentral area while offering nice low signal recording for far events.