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ASTM-F2156:2011 Edition

ASTM-F2156:2011 Edition

$40.63

F2156-11 Standard Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope

Published By Publication Date Number of Pages
ASTM 2011 6
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1.1 When an observer looks through an aerospace transparency, relative optical distortion results, specifically in thick, highly angled, multilayered plastic parts. Distortion occurs in all transparencies but is especially critical to aerospace applications such as combat and commercial aircraft windscreens, canopies, or cabin windows. This is especially true during operations such as takeoff, landing, and aerial refueling. It is critical to be able to quantify optical distortion for procurement activities.

1.2 This test method covers the apparatus and procedures that are suitable for measuring the grid line slope (GLS) of transparent parts, including those that are small or large, thin or thick, flat or curved, or already installed. This test method is not recommended for raw material.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3.1 Exception The values given in parentheses are for information only.

1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 FIG. 1
FIG. 2
3 Summary of Test Method
Significance and Use
Apparatus
Test Specimen
TABLE 1
4 Calibration and Standardization
Procedure
FIG. 3
5 Grid Line Slope Calculations
Report
Precision and Bias
TABLE 2
6 Keywords
TABLE 3

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