Design of feedback-controlled wide-band seismographs with respect to undesired side-effects

Teupser, Christian; Ples̆inger, A.

doi:10.1016/0031-9201(79)90132-8

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…FBAs are well adapted to record strong earthquakes, but it has been shown in Plesinger (1984) that, for a broadband record of the seismic activity, a sensor with a flat response to the ground velocity (i.e., a broadband seismometer) is better adapted (Sheffield, 1964;Melton and Johnson, 1962;Teupser and Plesinger, 1979;Usher et al, 1979;Wielandt and Streckeisen, 1982). This is achieved by introducing a derivative term in the controller, such as Hs g p g i =s sg d :…”

Section: Passive Accelerometermentioning

confidence: 97%

Review: Inertial Sensors for Low-Frequency Seismic Vibration Measurement

Collette¹,

Janssens²,

Fernandez-Carmona³

et al. 2012

Bulletin of the Seismological Society of America

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The objective of this paper is to review recent advances in the sensors used to measure seismic linear vibrations at low frequencies. The main types of inertial sensors are reviewed: absolute displacement sensors, geophones, accelerometers, and seismometers. The working principle of each of them is explained, along with the general strategies to extend their bandwidth. Finally, the principle fundamental limitations of all inertial sensors are reviewed: tilt-to-horizontal coupling, zerolength springs, and sources of noise.

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Section: Passive Accelerometermentioning

confidence: 97%

Review: Inertial Sensors for Low-Frequency Seismic Vibration Measurement

Collette¹,

Janssens²,

Fernandez-Carmona³

et al. 2012

Bulletin of the Seismological Society of America

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“…The response of the modified sensor could be considered as broadband (0.011-25 Hz, 1046 V/m/sec) which is in accordance with the heavy mass, the motor constant of the feedback coil, and the suspension itself. In the present development, characteristics of the seismometer together with the features of the force balance technique were merged following the criticism that has been noted in the literature (Teupser and Plesinger, 1979;Wielandt, 2004). The intervention reached approximately the cost of 600 USD in parts, while a period of two months was consumed for the prototyping and initial bench testing.…”

Section: Discussionmentioning

confidence: 99%

Broadening the Response of Short-Period Sensors: An Application to the Sprengnether S-7000 Seismometer

Koutsoukos

Melis

2007

Bulletin of the Seismological Society of America

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In this study the application of active damping on a short-period Sprengnether S-7000 passive sensor is presented. This sensor uses a unique magnetic suspension mechanism that eliminates spring resonance effects and ensures improved thermal behavior. The resilient properties of the magnetic spring are devoid of nonlinearities seen in the metallic springs. Although the magnetic suspension is highly susceptible in external magnetic fields, the magnetic scheme applied on the S-7000 seismometer ensures reliable magnetic shielding and it can be considered as a stable suspension. The multiple frequency-dependent feedback, which is the dominant technique in the design of broadband sensors, modified the original velocity response envelop of the old instrument. The theoretical response obtained from the new transfer function, in accordance with the experimental response obtained from calibration data, characterizes the modified S-7000 seismometer as a flat velocity (0.011 to 20 Hz) sensor with top sensitivity 1046 V/m/sec. Amplitude and spectral analyses of datasets obtained from local ground noise, as well as from local, regional, and teleseismic earthquake activity, have been shown to be comparable with respective recordings of other standard broadband seismometers operated at the Athens (ATH) seismographic station vault.

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“…[3][4][5][6]). However, there is still a continuous demand for high-end instruments, more efficient and better adapted to some specific applications.…”

Section: Introductionmentioning

confidence: 99%