ASTM F2469-20 PDF

Full title and description

Standard Test Method for Measuring Optical Angular Deviation of Transparent Parts Using the Double-Exposure Method — ASTM F2469-20. This test method defines a laboratory procedure to quantify the angular deviation (optical distortion) introduced by flat transparent parts such as aircraft windscreens, canopies, cabin windows and visors using a double-exposure/grid-based measurement technique.

Abstract

ASTM F2469-20 describes a repeatable, laboratory test procedure for measuring the angular displacement of light rays caused by flat transparent components. The method uses a defined grid target and a double-exposure photographic or equivalent optoelectronic recording technique to determine angular deviation across the part under test. Results characterize distortion, magnification and binocular disparity effects relevant to human visual performance and aerospace applications.

General information

• Status: Published as F2469-20; listed as a historical/withdrawn item in some secondary catalogs (ASTM document record shows historical status with a last-documented update on May 22, 2025).
• Publication date: January 5, 2020.
• Publisher: ASTM International.
• ICS / categories: 17.180.20 (Colours and measurement of light / optical measurement).
• Edition / version: F2469-20 (current designation/version from 2020).
• Number of pages: 4 pages.

Scope

This test method covers measurement of the optical angular deviation imposed on a light ray by flat transparent parts (for example, aircraft windshields, canopies, cabin windows and visors). It gives requirements for the test environment, target/grid, exposure technique and reporting of angular deviation values (expressed in standard angular units). The procedure is intended for characterizing distortion, magnification and for supporting assessment of binocular disparity between left- and right-eye positions.

Key topics and requirements

• Double-exposure measurement technique using a defined grid target or equivalent recording system to reveal angular displacement of rays through the part.
• Test-room and specimen mounting requirements to minimise stray reflections and ensure repeatable geometry.
• Defined measurement positions (typical left and right eye positions) to enable evaluation of binocular disparity effects.
• Specification of units and reporting convention (SI units as standard; angle units for results).
• Use of calibrated imaging/optical equipment (camera or optoelectronic receiver) and procedures to determine angular deviation across the part surface.
• Limitations and safety note that the standard does not address all safety concerns associated with test equipment or specimen handling; users must adopt appropriate safety practices.

Typical use and users

Typical users include aerospace and automotive OEMs, optical and materials testing laboratories, glazing and visor manufacturers, human-factors and vision researchers, regulatory and certification bodies evaluating cockpit/visors performance, and quality engineers assessing transparency distortion for fit-for-purpose acceptance.

Related standards

Standards and test methods commonly referenced alongside F2469 include ASTM F1181 (Standard Test Method for Measuring Binocular Disparity in Transparent Parts) and other F07 committee methods for optical measurement of transparent enclosures and materials. Earlier or alternate editions of F2469 (for example F2469-15) and apparatus-related methods (listed under Committee F07) may also be relevant.

Keywords

optical angular deviation, angular deviation, transparent parts, windscreen, canopy, visor, double-exposure method, grid board, binocular disparity, aircraft transparency, optical distortion, ASTM F2469-20

FAQ

Q: What is this standard?

A: ASTM F2469-20 is a test method that specifies how to measure the optical angular deviation introduced by flat transparent parts using a double-exposure/grid technique.

Q: What does it cover?

A: It covers the laboratory procedure, apparatus basics and reporting for quantifying angular displacement of light rays through flat transparent components (e.g., windscreens, canopies, cabin windows, visors), and supports assessment of binocular disparity.

Q: Who typically uses it?

A: Aerospace and automotive manufacturers, optical testing laboratories, visor and glazing suppliers, human-factors researchers, and certification or quality-assurance professionals.

Q: Is it current or superseded?

A: The designation is F2469-20 (published January 5, 2020). Some commercial catalogues list the document as withdrawn or historical; the ASTM document record also shows historical document metadata (last internal update noted May 22, 2025). Users who need a definitive legal or normative status should confirm the current disposition directly with ASTM International or via their document subscription service.

Q: Is it part of a series?

A: F2469 is part of the suite of ASTM F07 committee standards addressing transparent enclosures and materials (volume/book grouping for aerospace transparent materials). It is routinely used in conjunction with related test methods such as F1181 for binocular disparity and other F07 optical measurement methods.

Q: What are the key keywords?

A: optical angular deviation, angular deviation, double-exposure, grid board, transparent parts, windscreen, canopy, visor, binocular disparity, ASTM F2469-20.