ASTM F1364-92(1997)e1
(Practice)Standard Practice for Use of a Calibration Device to Demonstrate the Inspection Capability of an Interferometric Laser Imaging Nondestructive Tire Inspection System
Standard Practice for Use of a Calibration Device to Demonstrate the Inspection Capability of an Interferometric Laser Imaging Nondestructive Tire Inspection System
SCOPE
1.1 This standard practice describes the construction and use of a calibration device for demonstrating the anomaly detection capability of interferometric laser imaging nondestructive tire inspection system. A common practice within the industry is to refer to these systems as shearographic/holographic (S/H) systems.
1.2 This standard practice applies to S/H systems that are used 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 the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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e1
Designation: F 1364 – 92 (Reapproved 1997)
Standard Practice for
Use of a Calibration Device to Demonstrate the Inspection
Capability of an Interferometric Laser Imaging
Nondestructive Tire Inspection System
This standard is issued under the fixed designation F 1364; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—3 was modified editorially in March 1998.
1. Scope a tire (see Fig. 1). F 538
3.1.6 straining block holding fixture, n— a device for
1.1 This standard practice describes the construction and
holding one or more straining blocks in the S/H system during
use of a calibration device for demonstrating the anomaly
the calibration process (see Fig. 2). F 538
detection capability of interferometric laser imaging nonde-
structive tire inspection system. A common practice within the
4. Summary of Practice
industry is to refer to these systems as shearographic/
4.1 The straining block (Fig. 1) is designed to create an
holographic (S/H) systems.
image of a known anomaly against which the performance of
1.2 This standard practice applies to S/H systems that are
the S/H system may be evaluated. This image is created when
used for evaluating the structural integrity of pneumatic tires,
the rubber, which is affixed to the outer surface of the block, is
(for example, presence or absence of anomalies within the tire).
stressed by a vacuum. The interior of the block is vented to
1.3 This standard does not purport to address all of the
atmospheric pressure through the calibration hole, thus allow-
safety concerns, if any, associated with its use. It is the
ing a differential pressure on the rubber.
responsibility of the user of this standard to establish appro-
4.2 The size of the holes in a straining block can be used to
priate safety and health practices and determine the applica-
determine the sensitivity of the S/H system. Generally, larger
bility of regulatory limitations prior to use.
holes are more readily detectable. However, it is possible for a
2. Referenced Documents poorly calibrated S/H system to detect some small holes and
miss very large ones. Therefore, the calibration holes in the
2.1 ASTM Adjuncts:
straining blocks vary between diameters of 1 mm (0.04 in.) and
Straining Block Drawings
100 mm (4 in.). The straining blocks contain multiple calibra-
3. Terminology tion holes. A drawing of the straining blocks is shown in Fig.
1.
3.1 Definitions:
4.3 These straining blocks shall be placed in a series of
3.1.1 analysis, n—an act of inspecting the S/H image and
locations within the S/H system to confirm the detectability of
associating this image with a known calibration reference.
anomalies over the entire field of view within the S/H system.
F 538
An example of a typical straining block holding fixture is
3.1.2 anomoly, n—a change in the strain pattern of the
shown in Fig. 2.
rubber surface of a straining block as a result of applied stress
4.4 By studying the presence and clarity of the fringe
brought about through a change in atmospheric pressure on the
patterns obtained from each straining block an assessment of
rubber surface. F 538
machine calibration may be made. Adjustments such as optical
3.1.3 shearogram/hologram, n—the common term for an
alignment, laser power, vacuum level, beam ratio modifica-
interferometric image provided by S/H systems. F 538
tions, multiple exposure, viewer maintenance and other alter-
3.1.4 shearographic or holographic (S/H) systems, n—a
ations shall be made to optimize the ability to detect the various
shearographic or holographic system using interferometric
hole sizes in the straining blocks.
laser imaging to nondestructively inspect tires. F 538
3.1.5 straining block, n—a rigid aluminum test block with a
5. Significance and Use
rubber surface on one side capable of simulating an anomaly in
5.1 All S/H systems degrade with time and use. Therefore,
a calibration procedure for evaluating the operation of an S/H
This practice is under the jurisdiction of ASTM Committee F-9 on tires and is
system is desirable. This calibration procedure p
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