NDLI: A Radically New Principle of Operation Seismic Detector of Nano-Scale Vibrations

Content Provider	IEEE Xplore Digital Library
Author	Gevorgyan, S.G. Gevorgyan, V.S. Shirinyan, H.G. Karapetyan, G.H. Sarkisyan, A.G.
Copyright Year	2002
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.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	629
Ending Page	632
Page Count	4
File Size	771362
File Format	PDF
ISSN	10518223
Volume Number	17
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Oscillators Frequency Vibrations Testing Diodes Coils Accelerometers Vibrometers Mechanical sensors single-layer flat-coil oscillator Detector for gravity waves search nano-scale shift position sensor position sensing and controlling element for probe microscopes and seismic detectors
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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