ASTM F733-19
(Practice)Standard Practice for Optical Distortion and Deviation of Transparent Parts Using the Double-Exposure Method
Standard Practice for Optical Distortion and Deviation of Transparent Parts Using the Double-Exposure Method
SIGNIFICANCE AND USE
5.1 Transparent parts, such as aircraft windshields and windows, can be inspected using this practice, and the amount of optical distortion or deviation can be measured. The measurement shall be checked for acceptability against the specification for the part. The photograph (digital file, print, or negative) shall be maintained as a permanent record of the optical quality of the part.
SCOPE
1.1 This photographic practice determines the optical distortion and deviation of a line of sight through a simple transparent part, such as a commercial aircraft windshield or a cabin window. This practice applies to essentially flat or nearly flat parts moreso than to highly curved materials.
1.2 Test Method F801 addresses optical deviation (angular deviation), and Test Method F2156 addresses optical distortion using grid line slope. Use these test methods instead of Practice F733 whenever practical.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F733 − 19
Standard Practice for
Optical Distortion and Deviation of Transparent Parts Using
1
the Double-Exposure Method
ThisstandardisissuedunderthefixeddesignationF733;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 deviation, n—the displacement of a line or object
when viewed through the transparent part.
1.1 This photographic practice determines the optical dis-
tortion and deviation of a line of sight through a simple
3.1.1.1 Discussion—Expressed as the angular measurement
transparent part, such as a commercial aircraft windshield or a
of the displaced line, for example, milliradians of angle.
cabinwindow.Thispracticeappliestoessentiallyflatornearly
3.1.2 distortion, n—therateofchangeofdeviationresulting
flat parts moreso than to highly curved materials.
from an irregularity in a transparent part.
1.2 Test Method F801 addresses optical deviation (angular
3.1.2.1 Discussion—Expressed as the angular bending of
deviation),andTestMethodF2156addressesopticaldistortion
the light ray per unit of length of the part, for example,
usinggridlineslope.UsethesetestmethodsinsteadofPractice
milliradians per centimetre.
F733 whenever practical.
3.1.2.2 Discussion—Is also expressed as the slope of the
1.3 This standard does not purport to address all of the
angle of localized grid line bending, for example, 1 in 5 (see
safety concerns, if any, associated with its use. It is the
Fig. 1)
responsibility of the user of this standard to establish appro-
3.1.3 installed angle, n—the part attitude as installed in the
priate safety, health, and environmental practices and deter-
aircraft.
mine the applicability of regulatory limitations prior to use.
3.1.3.1 Discussion—Defined by the angle between a hori-
1.4 This international standard was developed in accor-
zontal line and the plane of the part, and the angle of sweep
dance with internationally recognized principles on standard-
back from a horizontal line normal to the center line of the
ization established in the Decision on Principles for the
aircraft. See Fig. 2 for an example.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Summary of Practice
Barriers to Trade (TBT) Committee.
4.1 The transparent part is placed a given distance from a
grid line pattern. A camera is placed so as to photograph the
2. Referenced Documents
gridpatternasviewedthroughthepart.Thephotographisthen
2
2.1 ASTM Standards:
examined and optical distortion or deviation is measured.
F801Test Method for Measuring OpticalAngular Deviation
of Transparent Parts
5. Significance and Use
F2156Test Method for Measuring Optical Distortion in
5.1 Transparent parts, such as aircraft windshields and
Transparent Parts Using Grid Line Slope
windows, can be inspected using this practice, and the amount
of optical distortion or deviation can be measured. The
3. Terminology
measurement shall be checked for acceptability against the
3.1 Definitions:
specification for the part. The photograph (digital file, print, or
negative) shall be maintained as a permanent record of the
optical quality of the part.
1
This practice is under the jurisdiction ofASTM Committee F07 on Aerospace
6. Apparatus
andAircraft and is the direct responsibility of Subcommittee F07.08 on Transparent
Enclosures and Materials.
6.1 Test Room—The test room must be large enough to
Current edition approved Nov. 1, 2019. Published December 2019. Originally
properly locate the required testing equipment.
approvedin1981.Lastpreviouseditionapprovedin2014asF733–09(2014).DOI:
10.1520/F0733-19.
6.1.1 MethodArequires a room approximately 12 m (40 ft)
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
long.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.2 Method B requires a room approximately 7 m (23 ft)
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. long.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F733 − 19
FIG. 1 Optical Distortion Represented by Tangent
TABLE 1 Optical Inspection Distances
6.1.3 The walls, ceiling, and floor shall have low reflec-
Method A
tance. A flat black paint or coating is preferred.
Camera-to-grid-board distance 1000 cm (32 ft 10 in.)
Camera-to-part distance 550 cm (18 ft 1 in.)
6
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F733 − 09 (Reapproved 2014) F733 − 19
Standard Practice for
Optical Distortion and Deviation of Transparent Parts Using
1
the Double-Exposure Method
This standard is issued under the fixed designation F733; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This photographic practice determines the optical distortion and deviation of a line of sight through a simple transparent
part, such as a commercial aircraft windshield or a cabin window. This practice applies to essentially flat or nearly flat parts and
may not be suitable for moreso than to highly curved materials.
1.2 Test Method F801 addresses optical deviation (angluar deviation)(angular deviation), and Test Method F2156 addresses
optical distortion using grid line slope. These Use these test methods should be used instead of Practice F733 whenever practical.
1.3 This standard does not purport to address all of the safety concerns concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and
determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
F801 Test Method for Measuring Optical Angular Deviation of Transparent Parts
F2156 Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope
3. Terminology
3.1 Definitions:
3.1.1 deviation—deviation, n—the displacement of a line or object when viewed through the transparent part. Expressed as the
angular measurement of the displaced line, for example, milliradians of angle.
3.1.1.1 Discussion—
Expressed as the angular measurement of the displaced line, for example, milliradians of angle.
3.1.2 distortion—distortion, n—the rate of change of deviation resulting from an irregularity in a transparent part.
3.1.2.1 Discussion—
Expressed as the angular bending of the light ray per unit of length of the part, for example, milliradians per centimetre.
3.1.2.2 Discussion—
Is also expressed as the slope of the angle of localized grid line bending, for example, 1 in 5 (see Fig. 1)
1
This practice is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 on Transparent
Enclosures and Materials.
Current edition approved Dec. 1, 2014Nov. 1, 2019. Published December 2014December 2019. Originally approved in 1981. Last previous edition approved in 20092014
as F733 – 09.F733 – 09(2014). DOI: 10.1520/F0733-09R14.10.1520/F0733-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F733 − 19
3.1.3 Expressed as the angular bending of the light ray per unit of length of the part, for example, milliradians per centimetre.
3.1.4 May also be expressed as the slope of the angle of localized grid line bending, for example, 1 in 5 (see Fig. 1).
3.1.3 installed angle—angle, n—the part attitude as installed in the aircraft. Defined by the angle between a horizontal line and
the plane of the part, and the angle of sweep back from a horizontal line normal to the center line of the aircraft. See Fig. 2 for
an example.
3.1.3.1 Discussion—
Defined by the angle between a horizontal line and the plane of the part, and the angle of sweep back from a horizontal line normal
to the center line of the aircraft. See Fig. 2 for an example.
4. Summary of Practice
4.1 The transparent part is placed a given distance from a grid line pattern. A camera is placed so as to photograph the grid
pattern as viewed through the part. The photograph is then examined and optical distortion or deviation is m
...
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