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ASTM F2156-01

Historical Revision

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

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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 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 shall be regarded as the standard. 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.


SDO ASTM: ASTM International
Document Number F2156
Publication Date Nov. 10, 2001
Language en - English
Page Count 6
Revision Level 01
Supercedes
Committee F07.08
Publish Date Document Id Type View
June 1, 2017 F2156-17 Revision
Dec. 1, 2011 F2156-11 Revision
Nov. 1, 2006 F2156-06 Revision
Nov. 10, 2001 F2156-01 Revision
May 1, 2022 F2156-17R22 Reaffirmation