NDLI: Ring lasers for geodesy

Content Provider	IEEE Xplore Digital Library
Author	Bilger, H.R. Stedman, G.E. Li, Z. Schreiber, U. Schneider, M.
Copyright Year	1963
Abstract	A rectangular 3.5 m perimeter prototype was constructed and put into operation in 1991. Here, we report on the improved performance after the device was located 30 m underground in Christchurch, New Zealand. In runs lasting well over one day, the Earth rotation produces linewidths down to 1 /spl mu/Hz; the rotation rate and associated phenomena are then resolved to about 100 nHz/70 Hz /spl cong/1.4/spl times/10/sup -9/, compatible with the estimated quantum noise of the 633 nm HeNe laser amplifier for large acquisition times of the order of 10/sup 5/ s to 10/sup 6/ s. To achieve this performance, however, drift of the Earth's Sagnac frequency of the order of 6 mHz/2 h is removed. Pulling due to the finite lock-in frequency (at present /spl ges/10 Hz) has been studied. The unpulled frequency can be retrieved from the data through an analysis of the instantaneous frequency, without having to resort to optimization of pulling. The response of the prototype in short term (minutes) is tested by seismic events. Extrapolation of the performance to much larger rings appears secure. A plane square ring of 1 m/sup 2/ and a larger 16 m/sup 2/ device is planned to reach the regime of Earth rotation fluctuations.<>
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	468
Ending Page	470
Page Count	3
File Size	288957
File Format	PDF
ISSN	00189456
Volume Number	44
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ring lasers Geodesy Frequency Earth Prototypes Laser noise Quantum well lasers Sagnac interferometers Information retrieval Data analysis
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
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
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
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
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
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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