ASTM_F_3079_-_14.pdf

Designation:F307914Standard Practice forUse of Distributed Optical Fiber Sensing Systems forMonitoring the Impact of Ground Movements During Tunneland Utility Construction on Existing Underground Utilities1This standard is issued under the fixed designation F3079;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice specifically addresses the means andmethods for the use of distributed optical fiber sensors formonitoring ground movements during tunnel and utility con-struction and its impact on existing utilities.1.2 This practice applies to the process of selecting suitablematerials,design,installation,data collection,data processingand reporting of results.1.3 This practice applies to all utilities that transport water,sewage,oil,gas,chemicals,electric power,communicationsand mass media content.1.4 This practice applies to all tunnels that transport and/orstore water or sewage.1.5 This practice also applies to tunnels that carry theutilities in(1.3),water for hydropower,traffic,rail,freight,capsule transport,and those used for storage.1.6 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE2586 Practice for Calculating and Using Basic Statistics2.2 Other Standards:IEC 61753-1 Fibre Optic Interconnecting Devices and Pas-sive Components Performance StandardPart 1:Generaland Guidance for Performance Standards3IEC 61757-1 Fibre Optic SensorsPart 1:Generic Specifi-cation3COST Action 299“FIDES”Optical Fibres for New Chal-lenges Facing the Information Society4ITU-T G.652 Characteristics of a Single-mode Optical Fibreand Cable53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accuracythe closeness of the measured value to thetrue or the ideal value of the parameter being measured.Accuracy represents the difference between the measuredresult and the true value and is affected by both bias andprecision.3.1.2 attenuationthe decrease in power of a signal,or lightwave,from interaction with the propagation medium.Thedecrease usually occurs as a result of absorption,reflection,diffusion,scattering,deflection,dispersion or resistance.3.1.3 attenuation budget(also called optical power dynamicrange and link budget)the maximum cumulative one-way ortwo-way power loss between the interrogator and the measure-ment point that allows a measurement with a specified perfor-mance.3.1.4 biasthe difference between the measured result afteraveraging and the true value.The true value can be obtainedeither by measuring a reference standard maintained by thenational standard organizations or by using a traceable mea-suring instrument.3.1.5 bofdaBrillouin optical frequency domain analysis.1This test method is under the jurisdiction of ASTM Committee F36 onTechnology and Underground Utilities and is the direct responsibility of Subcom-mittee F36.10 on Optical Fiber Systems within Existing Infrastructure.Current edition approved Oct.1,2014.Published October 2014.DOI:10.1520/F3079-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from International Electrotechnical Commission(IEC),3,rue deVaremb,P.O.Box 131,CH-1211 Geneva 20,Switzerland,http:/www.iec.ch.4For additional information,visit http:/www.cost.eu.5Available from International Telecommunication Union(ITU),Place desNations 1211,Geneva 20,Switzerland,http:/www.itu.int.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.6 bofdrBrillouin optical frequency domain reflectom-etry.3.1.7 botdaBrillouin optical time domain analysis.3.1.8 botdrBrillouin optical time domain reflectometry.3.1.9 characteristic frequency and/or wavelength at refer-ence temperature(Brillouin technologies)the wavelengththat characterizes the sensor response at reference temperatureas monitored by the interrogator.As Brillouin frequency varieswith wavelength of the light source,this also changes thetemperature and strain coefficients for various sensing fibers.Therefore,the characteristic frequency and the wavelength at aspecified reference