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ASTM F2156

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

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Organization: ASTM
Publication Date: 10 November 2001
Status: inactive
Page Count: 6
ICS Code (Aircraft and space vehicles in general): 49.020
scope:

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.

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.

The values stated in SI units shall be regarded as the standard. The values given in parentheses are for information only.

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.

Document History

June 1, 2017
Standard Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope
When an observer looks through an aerospace transparency, relative optical distortion results, specifically in thick, highly angled, multilayered plastic parts. Distortion occurs in all...
December 1, 2011
Standard Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope
When an observer looks through an aerospace transparency, relative optical distortion results, specifically in thick, highly angled, multilayered plastic parts. Distortion occurs in all...
November 1, 2006
Standard Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope
When an observer looks through an aerospace transparency, relative optical distortion results, specifically in thick, highly angled, multilayered plastic parts. Distortion occurs in all...
ASTM F2156
November 10, 2001
Standard Test Method for Measuring Optical Distortion in Transparent Parts Using Grid Line Slope
When an observer looks through an aerospace transparency, relative optical distortion results, specifically in thick, highly angled, multilayered plastic parts. Distortion occurs in all...
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