KIT | KIT-Bibliothek | Impressum | Datenschutz

Frequency response of the superconducting gravimeter SG056

Forbriger, Thomas ORCID iD icon; Heck, Alexandra

Abstract (englisch):

The two sensors of the SG 056 double-sphere superconducting gravimeter at BFO (Black Forest Observatory, Germany) show differences in their response to long-period seismic signals. Their frequency response deviates from the nominal GGP1-filter (8th-order Bessel low-pass). We experimentally derive parameterized models for the sensor’s full frequency response by application of square-wave and down-sweep drive signals to the feedback circuit and subsequent inversion. The latter is carried out with the program calex in the time domain which iteratively minimizes the least-squares misfit between the output signal predicted with the filter model and the actual output of the sensor. We seek for values of eigenperiod and damping of the four 2nd-order subsystems of 8th-order low-pass filters. The resulting filters deviate considerably from the nominal response of the GGP1-filter also in that they are not Bessel filters. Remaining residuals indicate that the models are not able to capture the exact response. Nevertheless, they substantially reduce amplitudes of waveform-residuals in long-period earthquake recordings by a factor of four. The filter response curves approach their DC-limit (frequency f = 0Hz) within the frequency band of the drive signals. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000080212
Veröffentlicht am 17.10.2018
Cover der Publikation
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
Geophysikalisches Institut (GPI)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Buchaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISBN: 978-3-7315-0777-2
ISSN: 1612-9733
KITopen-ID: 1000080212
Erschienen in (Schw)Ehre, wem (Schw)Ehre gebührt : Festschrift zur Verabschiedung von Prof. Dr.-Ing. Dr. h.c. Bernhard Heck. Hrsg.: A. Heck
Verlag KIT Scientific Publishing
Seiten 57-67
Serie Schriftenreihe des Studiengangs Geodäsie und Geoinformatik / Karlsruher Institut für Technologie, Studiengang Geodäsie und Geoinformatik ; 2018,1
Bemerkung zur Veröffentlichung Verlagsausgabe zusätzlich registriert unter DOI: 10.5445/KSP/1000080212
Relationen in KITopen
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page