ISO 14490-6:2014 PDF

Optics and photonics — Test methods for telescopic systems — Part 6: Test methods for veiling glare index

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Title (English):

ISO 14490-6:2014

Optics and photonics — Test methods for telescopic systems — Part 6: Test methods for veiling glare index

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: October 17, 2014
Edition:: ISO IS 14490 edition 2 version 1
ICS:: 37.020

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Description (English):

ISO 14490-6:2014 specifies the test methods for the determination of the veiling glare index of telescopic systems and observational telescopic instruments.

Technical details

Technical committee: ISO/TC 172/SC 4 - Telescopic systems
SKU: ISO 14490-6:2014

Abstract

Overview

ISO 14490-6:2014 - Optics and photonics: Test methods for telescopic systems - Part 6: Test methods for veiling glare index - specifies laboratory procedures to determine the veiling glare index (VGI) of telescopic systems and observational telescopic instruments. The standard adopts the black patch (integral) method (as described in ISO 9358:1994) for terrestrial telescopes and defines the measurement principle, required test arrangement, procedure, presentation of results and repeatability criteria.

Key topics and technical requirements

Measurement principle: VGI, S = E1 / E2, is the ratio of illuminance of the image of a black surface (E1) within a diffusely illuminated white field to the illuminance of the image of a totally white surface (E2). Results are expressed as a percentage.
Preferred method: Black patch (integral) method for telescopic systems; glare spread function is referenced for astronomical use to ISO 9358:1994.
Test arrangement components:
- Integrating sphere (diameter ≥ 15× entrance pupil, min. 1 m), interior reflectance ≥ 85% across 380–780 nm.
- Object-side collimator: achromatic lens, min. f-number 10, aperture > 1.2× objective lens diameter; focal length equals sphere interior diameter; antireflection coatings required.
- Measurement & evaluation unit: limiting stop (8 mm at exit pupil), filter (to match detector to photopic response), image-side collimator, measuring stop (20–50% of black image diameter), radiation detector and indicator.
- Reference surfaces: removable white disk and annular black element with light trap (black trap luminance

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Measurement principle: VGI, S = E1 / E2, is the ratio of illuminance of the image of a black surface (E1) within a diffusely illuminated white field to the illuminance of the image of a totally white surface (E2). Results are expressed as a percentage.
Preferred method: Black patch (integral) method for telescopic systems; glare spread function is referenced for astronomical use to ISO 9358:1994.
Test arrangement components:
- Integrating sphere (diameter ≥ 15× entrance pupil, min. 1 m), interior reflectance ≥ 85% across 380–780 nm.
- Object-side collimator: achromatic lens, min. f-number 10, aperture > 1.2× objective lens diameter; focal length equals sphere interior diameter; antireflection coatings required.
- Measurement & evaluation unit: limiting stop (8 mm at exit pupil), filter (to match detector to photopic response), image-side collimator, measuring stop (20–50% of black image diameter), radiation detector and indicator.
- Reference surfaces: removable white disk and annular black element with light trap (black trap luminance

ISO 14490-6:2014 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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