ASTM_F_1364_-_03_2015.pdf

Designation:F136403(Reapproved 2015)Standard Practice forUse of a Calibration Device to Demonstrate the InspectionCapability of an Interferometric Laser ImagingNondestructive Tire Inspection System1This standard is issued under the fixed designation F1364;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 describes the construction and use of acalibration device for demonstrating the anomaly detectioncapability of interferometric laser imaging nondestructive tireinspection system.Acommon practice within the industry is torefer to these systems as shearographic/holographic(S/H)systems.1.2 This standard practice applies to S/H systems that areused for evaluating the structural integrity of pneumatic tires,(for example,presence or absence of anomalies within the tire).1.3 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:2F538 Terminology Relating to the Characteristics and Per-formance of Tires2.2 ASTM Adjuncts:Straining Block Drawings33.Terminology3.1 Definitions:3.1.1 analysis,nan act of inspecting the S/H image andassociating this image with a known calibration reference.F5383.1.2 shearogram/hologram,nthe common term for aninterferometric image provided by S/H systems.F5383.1.3 shearographic or holographic(S/H)systems,nashearographic or holographic system using interferometriclaser imaging to nondestructively inspect tires.F5383.1.4 straining block,na test block containing a numberof anomalies,that is capable of simulating an anomaly in a tire.F5383.1.5 straining block anomoly,na change in the strainpattern of the deformable surface of a straining block as a resultof applied stress brought about through a change in atmo-spheric pressure on the deformable surface.3.1.5.1 DiscussionA distinction is made between ananomaly in the straining block and an anomaly in the a tire.F5383.1.6 straining block holding fixture,na device for hold-ing one or more straining blocks in the S/H system during theinspection process(see Fig.1).F5384.Summary of Practice4.1 The straining block is designed to create an image of aknown anomaly against which the performance of the S/Hsystem may be evaluated.The block is constructed by securinga flexible membrane over a rigid block that contains a series ofholes of various sizes and shapes.The membrane should bemade of a material that retains its physical properties over timewith minimal aging effects.The interior holes in the block areeither vented to atmospheric pressure or sealed at a nominalpressure,allowing a differential pressure to exist on themembrane when the block is subjected to a vacuum.It is thedeflection of the surface under this differential pressure that ismeasured by the S/H system.The thickness of material must beselected to give deflections that are representative of thoseassociated with anomalies found in a tire.4.2 The size of the holes in a straining block can be used todetermine the sensitivity of the S/H system.Generally,largerholes are more readily detectable.However,it is possible for apoorly calibrated S/H system to detect some small holes andmiss very large ones.Therefore,a calibration block shouldcontain holes of varying diameter and depth,consistent with1This practice is under the jurisdiction of ASTM Committee F09 on Tires and isthe direct responsibility of Subcommittee F09.10 on Equipment,Facilities andCalibration.Current edition approved June 1,2015.Published September 2015.Originallyapproved in 1992.Last previous edition approved in 2010 as F1364 03(2010).DOI:10.1520/F1364-03R15.2For 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 ASTM International Headquarters.Order Adjunct No.ADJF1364.Original adjunct produced in 1992.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the range of anomaly sizes that are expected in use of the S/Hsystem.Typically,the calibration holes in the straining blocksvary between diameters of 1 mm(0.04 in.)and 100 mm(4 in.).A drawing of one version of the straining blocks is shown inFig.2.4.3 These straining blocks shall be placed in a series oflocations within the S/H system to confirm the detectability ofanomalies over the entire field of view within the S/H system.Alternately,a straining block can be designed to be rectangularin shape with proporti