EN 4533-002:2006

Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement

Insertion loss is the most frequent measurement performed on a fibre optic link. The avionic system designer will want to know or predict the insertion loss of a link to determine its performance. Aircraft manufacturers will want to measure the insertion loss of harness components during assembly and before it is delivered to the customer to highlight faults and to provide a record of the performance of the harness at the beginning of its lifetime (footprinting). The insertion loss will be measured at intervals during the lifetime of the aircraft to discover or identify faults and any gradual degradation in performance of the harness.
There is, however, one problem. It is difficult to collect reliable and consistent measurements of the insertion loss on any multi-mode fibre optic harness where the distance between components is relatively small (less than 100 metres). The reason is that the insertion loss of a component or a harness depends on the power distribution of the light injected into it. This leads to very large differences in the measured value of the insertion loss [1] depending on the power distribution of the source used to make the measurement.
This Part of EN 4533 will explain the measurement problem and the techniques used to overcome them in greater detail.

Luft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 002: Prüfung und Messung

Die Bestimmung der Einfügungsdämpfung ist die am häufigsten durchgeführte Messung an einer LWL-Über¬tragungsleitung. Der Konstrukteur des Luftfahrzeugsystems wird die Einfügungsdämpfung einer Übertra¬gungs¬¬leitung kennen oder vorhersagen wollen, um deren Leistung zu bestimmen. Luftfahrzeug¬hersteller werden die Einfügungsdämpfung von Kabelbaum-Bauteilen während der Montage vor der Auslieferung an den Käufer messen wollen, um Fehler hervorzuheben und um eine Aufzeichnung der Leistung des Kabel¬baums zu Beginn seiner Lebensdauer bereitzustellen (Ausleuchten). Die Einfügungs¬dämpfung wird während der Lebensdauer des Luftfahrzeugs regelmäßig gemessen, um Fehler sowie einen schrittweisen Leistungs¬abbau des Kabelbaums zu entdecken oder zu identifizieren.
Es gibt jedoch ein Problem. Es ist schwierig, zuverlässige und gleichmäßige Messwerte der Einfügungs¬dämpfung von einem beliebigen Mehrmoden- LWL-Kabelbaum zu sammeln, wenn der Abstand zwischen den Bauteilen relativ gering ist (weniger als 100 m). Grund dafür ist, dass die Einfügungs¬dämpfung eines Bauteils oder Kabelbaums von der Leistungsaufteilung des Lichteingangs abhängig ist. Dies führt zu sehr großen Differenzen bei den Messwerten der Einfügungsdämpfung [1] in Abhängigkeit von der Leistungsaufteilung der bei der Messung verwendeten Quelle.
Dieser Teil von EN 4533 erörtert eingehend das Problem der Messungen sowie die Techniken, um diese zu lösen.

Série aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 002 : Essais et mesures

Aeronavtika - Sistemi iz optičnih vlaken - Priročnik - 002. del: Preskušanje in merjenje

General Information

• Status: Withdrawn
• Publication Date: 11-Jul-2006
• Withdrawal Date: 19-Dec-2017
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2 - Electrical
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 20-Dec-2017
• Ref Project: SIST EN 4533-002:2009 - Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement

Relations

• Replaced By: EN 4533-002:2017 - Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement
• Effective Date: 27-Dec-2017

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.PHUMHQMHLuft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 002: Prüfung und MessungSérie aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 002 : Essais et mesuresAerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 4533-002:2006SIST EN 4533-002:2009en,de01-junij-2009SIST EN 4533-002:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4533-002July 2006ICS 49.060 English VersionAerospace series - Fibre optic systems - Handbook - Part 002:Test and measurementSérie aérospatiale - Systèmes des fibres optiques - Manueld'utilisation - Partie 002 : Essais et mesuresLuft- und Raumfahrt - Faseroptische Systemtechnik -Handbuch - Teil 002: Tests und MessungenThis European Standard was approved by CEN on 28 April 2006.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4533-002:2006: ESIST EN 4533-002:2009

 Part 003: Looming and installation practices  Part 004: Repair, maintenance and inspection b) Background It is widely accepted in the aerospace industry that photonic technology offers a number of significant advantages over conventional electrical hardware. These include massive signal bandwidth capacity, electrical safety, and immunity of passive fibre-optic components to the problems associated with electromagnetic interference (EMI). To date, the latter has been the critical driver for airborne fibre-optic communications systems because of the growing use of non-metallic aerostructures. However, future avionic requirements are driving bandwidth specifications from 10’s of Mbits/s into the multi-Gbits/s regime in some cases, i.e. beyond the limits of electrical interconnect technology. The properties of photonic technology can potentially be exploited to advantage in many avionic applications, such as video/sensor multiplexing, flight control signalling, electronic warfare, and entertainment systems, as well as in sensing many of the physical phenomena on-board aircraft. The basic optical interconnect fabric or `optical harness’ is the key enabler for the successful introduction of optical technology onto commercial and military aircraft. Compared to the mature telecommunications applications, an aircraft fibre-optic system needs to operate in a hostile environment (e.g. temperature extremes, humidity, vibrations, and contamination) and accommodate additional physical restrictions imposed by the airframe (e.g. harness attachments, tight bend radii requirements, and bulkhead connections). Until recently, optical harnessing technology and associated practices were insufficiently developed to be applied without large safety margins. In addition, the international standards did not adequately cover many aspects of the life cycle. The lack of accepted standards thus lead to airframe specific hardware and support. These factors collectively carried a significant cost penalty (procurement and through-life costs), that often made an optical harness less competitive than an electrical equivalent.
c) The fibre-optic harness study The Fibre-Optic Harness Study concentrated on developing techniques, guidelines, and standards associated with the through-life support of current generation fibre-optic harnesses applied in civil and military airframes (fixed and rotary wing). Some aspects of optical system design were also investigated. This programme has been largely successful. Guidelines and standards based primarily on harness study work are beginning to emerge through a number of standards bodies. Because of the aspects covered in the handbook, European prime contractors are in a much better position to utilise and support available fibre optic technology. SIST EN 4533-002:2009

This Part of EN 4533 will explain the measurement problem and the techniques used to overcome them in greater detail. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 4533-004,
Aerospace series – Fibre optic systems – Handbook – Part 004: Repair, maintenance and inspection.
ARP5061,
Guidelines for Testing and Support of Aerospace, Fiber Optic, Inter-Connect Systems. 1) 3 Problem areas and limitations 3.1 The problem of testing avionic, multi-mode fibre installations The insertion loss of a fibre optic harness can be divided into two contributions. The first is the intrinsic loss of th
...