SIST EN 3745-302:2004
(Main)Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 302: Numerical aperture
Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 302: Numerical aperture
This standard specifies a method of determining the effective numerical aperture of an optical cable or fibre used in aerospace applications.
Luft- und Raumfahrt - Faseroptische Leitungen für Luftfahrzeuge - Prüfverfahren - Teil 302: Numerische Apertur
Diese Norm legt ein Verfahren zur Bestimmung der effektiven numerischen Apertur eines Lichtwellenleiters oder Lichtwellenleiterkabels für Anwendungen in der Luft- und Raumfahrt fest.
Série aérospatiale - Fibres et câbles optiques a usage aéronautique - Méthodes d'essais - Partie 302: Ouverture numérique
Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 302: Numerical aperture
General Information
- Status
- Published
- Publication Date
- 30-Apr-2004
- Technical Committee
- I08 - Imaginarni 08
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-May-2004
- Due Date
- 01-May-2004
- Completion Date
- 01-May-2004
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 15-Oct-2025
Overview
SIST EN 3745-302:2004 sets out standardized test methods for determining the effective numerical aperture (NA) of optical fibres and cables used in aerospace applications. Developed as part of the European aerospace series for optical and electric equipment, this standard ensures that measurements of numerical aperture on optical cables and fibres for aircraft use are reliable, consistent, and accurate. By defining specific procedures for specimen preparation, apparatus, and measurement techniques, the standard supports quality assurance in aerospace fibre optic systems.
Key Topics
- Numerical Aperture (NA) Measurement: The standard details the procedures for measuring the numerical aperture, a parameter that defines the light-gathering ability and transmission characteristics of optical fibres used in aircraft.
- Specimen Preparation: Guidance is provided for preparing test specimens, including stabilization under standard conditions as referenced from related aerospace standards.
- Test Apparatus: Two approved methods for measuring NA are specified:
- Far Field Rotating Arm Method: Involves a rotating detector arm and measures radiant intensity as a function of angle.
- CCD Camera Method: Uses a fixed setup with a Charge Coupled Device camera to analyze the intensity profile of light exiting the fibre.
- Measurement Consistency: Instructions are included to ensure repeated, precise measurements, such as maintaining acceptable radius of curvature for fibre samples and specifying measurement intervals.
- Result Analysis: The process incorporates signal averaging and plotting radiation intensity diagrams for accurate determination of NA.
Applications
- Aerospace Optical Fibre Quality Assurance: Ensuring optical fibres and cables installed in aircraft meet rigorous light transmission requirements, supporting reliable data communication and sensor networks onboard.
- Component Testing for Aerospace Systems: Manufacturers and suppliers use the specified methods to validate optical component performance as part of pre-installation testing and certification.
- R&D and Qualification: Research, development, and qualification laboratories benefit from a harmonized approach to evaluate optical cable characteristics, reducing ambiguity in procurement and maintenance processes.
- Aircraft Maintenance and Safety: Accurate numerical aperture determination helps maintain system performance, contributing to overall reliability in critical aerospace environments.
Related Standards
Adopting SIST EN 3745-302:2004 often requires reference to complementary aerospace standards for preparation and testing:
- EN 3745-100: General test methods for optical fibres and cables used in the aerospace series.
- EN 2591-100: General test methods for elements of electrical and optical connection in aerospace systems.
These related standards provide foundational procedures and definitions that support the precise application of NA testing in line with SIST EN 3745-302:2004.
Keywords: SIST EN 3745-302:2004, numerical aperture, optical fibre, optical cable, aerospace, aircraft, fibre optic testing, quality assurance, standard test methods, fibre optics in aerospace, EN 3745-302, specimen preparation, aerospace standards, optical cable testing, NA measurement, CCD method, rotating arm method.
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Frequently Asked Questions
SIST EN 3745-302:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 302: Numerical aperture". This standard covers: This standard specifies a method of determining the effective numerical aperture of an optical cable or fibre used in aerospace applications.
This standard specifies a method of determining the effective numerical aperture of an optical cable or fibre used in aerospace applications.
SIST EN 3745-302:2004 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 3745-302:2004 has the following relationships with other standards: It is inter standard links to SIST EN 2591-100:2024, SIST EN 3745-100:2008, SIST EN 4641-200:2019, SIST EN 4641-102:2009, SIST EN 4641-202:2019, SIST EN 4641-401:2024, SIST EN 4641-301:2011, SIST EN 4641-100:2015, SIST EN 4641-201:2019, SIST EN 4641-301:2022, SIST EN 4641-101:2015, SIST EN 4641-301:2024, SIST EN 4641-102:2025, SIST EN 4641-106:2019, kSIST FprEN 3745-100:2026. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 3745-302:2004 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 302: Numerical apertureLuft- und Raumfahrt - Faseroptische Leitungen für Luftfahrzeuge - Prüfverfahren - Teil 302: Numerische AperturSérie aérospatiale - Fibres et câbles optiques a usage aéronautique - Méthodes d'essais - Partie 302: Ouverture numériqueAerospace series - Fibres and cables, optical, aircraft use - Test methods - Part 302: Numerical aperture49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 3745-302:2002SIST EN 3745-302:2004en01-maj-2004SIST EN 3745-302:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3745-302June 2002ICS 49.060English versionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 302: Numerical apertureSérie aérospatiale - Fibres et câbles optiques à usageaéronautique - Méthodes d'essais - Partie 302: OuverturenumériqueLuft- und Raumfahrt - Faseroptische Leitungen fürLuftfahrzeuge - Prüfverfahren - Teil 302: NumerischeAperturThis European Standard was approved by CEN on 1 March 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-302:2002 ESIST EN 3745-302:2004
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