The optical angular deviation of flat transparent parts, such as aircraft windshields, canopies, cabin windows, and visors, can be measured using these methods. Angular deviation in a windscreen or visor can cause objects to appear at a location different from where they actually are. Variations in angular deviation can be used to characterize distortion and magnification in transparent parts. Also, angular deviation measurements made from the typical right and left eye positions for a windscreen or other transparent medium can be used to determine binocular disparity differences (see Test Method F1181).

1. Scope

1.1 This test method covers the measurement of the optical angular deviation of a light ray imposed by flat transparent parts such as a commercial or military aircraft windshield, canopy or cabin window.

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

1.2.1 Exceptions—The values given in parentheses are for information only. Also, print size is provided in inch-pound measurements.

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

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

F733 Practice for Optical Distortion and Deviation of Transparent Parts Using the Double-Exposure Method

F801 Test Method for Measuring Optical Angular Deviation of Transparent Parts

F1181 Test Method for Measuring Binocular Disparity in Transparent Parts

Keywords

angular deviation; canopy; grid board; optical deviation; transparency; Double-exposure method; Optical angular deviation; Transparent materials;

ICS Code

ICS Number Code 17.180.20 (Colours and measurement of light)

Citing ASTM Standards

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