DocumentCode :
1066502
Title :
A Radically New Principle of Operation Seismic Detector of Nano-Scale Vibrations
Author :
Gevorgyan, Samvel G. ; Gevorgyan, Vardan S. ; Shirinyan, Hovsep G. ; Karapetyan, Gagik H. ; Sarkisyan, Albert G.
Author_Institution :
Yerevan State Univ., Yerevan
Volume :
17
Issue :
2
fYear :
2007
fDate :
6/1/2007 12:00:00 AM
Firstpage :
629
Lastpage :
632
Abstract :
A new class broad-band, nano-scale shift position sensor is created and tested. It maybe used as an additional sensor in seismographs/accelerometers/vibrometers. It enables to extend band and enhance sensitivity of the technique available on market by 10-100 times, depending on model of the base product. Combined with such sensor traditional technique may enable to study quasi-static deformations and low-order free oscillations of Earth crust precursor to earthquakes - perhaps unnoticeable to other methods. It may permit to detect also gravity waves, and study peculiarities of tidal motion and tsunami. It may allow to transfer mechanical vibrations of constructions & buildings, with amplitudes over 1 nm, into detectable signal in a frequency range starting from quasi-static movements. It is based on detection of position changes of a vibrating metallic plate placed near the flat coil-being used as a pick-up in a stable tunnel diode oscillator. Frequency of oscillator is used as a detecting parameter, and the measuring effect is determined by a distortion of a MHz-range testing field configuration near the coil by a vibrating plate, leading to magnetic inductance changes of a coil with a resolution ~10 pH. This results in the changes of oscillator frequency. We discuss initial-test data of such position sensor, installed in a Russian SM-3 seismometer, as the additional pick-up component, showing its advantages compared to traditional. We discuss also future of such new position sensor related with substitution of a normal-metallic coil by the superconductive one & replacement of a tunnel diode by S/I/S structure - as less-powered active element in oscillator. These may strongly improve stability of oscillator, and hence, enhance resolution of the seismic detectors.
Keywords :
Earth crust; position measurement; seismometers; sensors; superconducting coils; tunnel diode oscillators; vibration measurement; Earth crust precursor; Russian SM-3 seismometer; S/I/S structure; broadband position sensor; earthquake detection; enhanced resolution; gravity waves detection; improved stability; low-order free oscillations; mechanical vibrations; nanoscale shift position sensor; nanoscale vibrations; normal-metallic coil; quasistatic deformations; seismic detectors; single-layer flat-coil oscillator; stable tunnel diode oscillator; superconductive coil; tidal motion; tsunami; vibrating metallic plate; Accelerometers; Coils; Detectors; Diodes; Frequency; Mechanical sensors; Oscillators; Testing; Vibrations; Vibrometers; Detector for gravity waves search; nano-scale shift position sensor; position sensing and controlling element for probe microscopes and seismic detectors; single-layer flat-coil oscillator;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2007.898678
Filename :
4277407
Link To Document :
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