ASTM E2544-07a

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Designation:E2544–07a
Standard Terminology for
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Three-Dimensional (3-D) Imaging Systems
This standard is issued under the fixed designation E2544; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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1. Scope 2.2 ASME Standard:
B89.4.19 Performance Evaluation of Laser Based Spherical
1.1 Thisterminologycontainscommonterms,definitionsof
Coordinate Measurement Systems
terms, descriptions of terms, nomenclature, and acronyms
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2.3 ISO Standard:
associatedwiththree-dimensional(3-D)imagingsystemsinan
VIM, International Vocabulary of Basic and General Terms
effort to standardize terminology used for 3-D imaging sys-
in Metrology
tems.
ISO 11146–1 Lasers and laser-related equipment — Test
1.2 The definitions of the terms presented in 3.1 are ob-
methods for laser beam widths, divergence angles and
tained from various standard documents developed by various
beam propagation ratios — Part 1: Stigmatic and simple
standards development organizations. The intent is not to
astigmatic beams
change these universally accepted definitions but to gather, in
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2.4 NIST/SEMATECH Standard:
asingledocument,termsandtheirdefinitionsthatmaybeused
NIST/SEMATECH e-Handbook of Statistical Methods
in current or future standards for 3-D imaging systems.
1.2.1 In some cases, definitions of the same term from two
3. Terminology
standards have been presented to provide additional reference.
3.1 Definitions:
The text in parentheses to the right of each defined term is the
name(and,insomecases,thespecificsection)ofthesourceof
accuracy of measurement, n—closeness of the agreement
the definition associated with that term.
between the result of a measurement and a true value of the
1.3 The definitions in 3.2 are specific terms developed by
measurand. (VIM 3.5)
this committee for 3-D imaging systems.
DISCUSSION—
1.4 A definition in this terminology is a statement of the
(1) Accuracy is a qualitative concept.
meaning of a word or word group expressed in a single
(2)Theterm“precision”shouldnotbeusedfor“accuracy.”
sentence with additional information included in notes or
discussions.
angularincrement, n—theanglebetweensamples, Da,where
1.5 This standard does not purport to address all of the
Da = a− a−1, in either the azimuth or elevation directions
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safety concerns, if any, associated with its use. It is the
(or a combination of both) with respect to the instrument’s
responsibility of the user of this standard to establish appro-
internal frame of reference.
priate safety and health practices and determine the applica-
DISCUSSION—For scanning instruments, the angular increment may
bility of regulatory limitations prior to use.
also be known as the angle step size.
NOTE 1—The subcommittee responsible for this standard will review
definitions on a five-year basis to determine if the definition is still bias (of a measuring instrument), n—systematic error of the
appropriateasstated.Revisionswillbemadewhendeterminednecessary.
indication of a measuring instrument. (VIM 3.25)
DISCUSSION—The bias of a measuring instrument is normally esti-
2. Referenced Documents
mated by averaging the error of indication over an appropriate number
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2.1 ASTM Standard:
of repeated measurements.
E456 Terminology Relating to Quality and Statistics
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This terminology is under the jurisdiction of Committee E57 on 3D Imaging Available from American Society of Mechanical Engineers (ASME), ASME
Systems and is the direct responsibility of Subcommittee E57.01 on Terminology. International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
Current edition approved Aug. 1, 2007. Published September 2007. Originally www.asme.org.
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approved in 2007. Last previous edition approved in 2007 as E2544-07. Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4th Floor, New York, NY 10036, http://www.ansi.org.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from National Institute of Standards and Technology (NIST), 100
Standards volume information, refer to the standard’s Document Summary page on Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
the ASTM website. e-Handbook available at http://www.itl.nist.gov/div898/handbook/.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E2544–07a
bias, n—differencebetweentheaverageorexpectedvalueofa (1) Examples include analog indicating voltmeter, digital
dist
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