1、i Comments should be sent within six months after the date of Dubiication to AECMA STANDARD NORME AECMA AECMA NORM C2 Chairman prEN 259 1-607 Edition P 1 October 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fa
2、x. (+32) 2 775 81 11 ICs: Descriptors: ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 607: Optical elements Immunity to ambient light coupling Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverf ahren Organes de connexion lectrique et optiqu
3、e Partie 607 : Organes optiques Immunit de couplage la lumire ambiante Elektrische und optische Verbindungselemente Teil 607: Optische Elemente Fremdlichteinkopplung This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industr
4、ies). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an ext
5、ent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European S
6、tandard to CEN (European Committee for Standardization) for formal vote. Nota - Extra cories can be suoolied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Edition approved for publication ( AECMA Gulledelle 94 I Mr Perzetta I B-1200 BRUXELLES aecma
7、1997 STD.AECMA PREN 2591-bU7-ENGL 1997 3012311 0033497 095 I Page 3 prEN 2591 -607: 1997 Previous page is blank 1 Scope This standard specifies a method of measuring the immunity of optical connection elements (including permanent connections) and fibre couplers to the coupling of power coming from
8、an external light source. It shall be used together with EN 2591-100. 2 Normatives references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are list
9、ed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2591-100 Aerospace series
10、 - Elements of electrical and optical connection - Test methods - General 1 3 Preparation of specimens 3.1 product standard. Cavities with unterminated contacts shall have filler plugs fitted (where applicable). The specimens shall be fitted with normal accessories and terminated as specified in the
11、 3.2 - type and length of cable/fibre; - spectral characteristics of the light source or color temperature of the black body radiation. Unless specified in the technical specification, the following details shall be stated: 4 Apparatus The apparatus shall comprise: C D a detector; Di a diffuser; IS
12、an integration sphere; LA a locking amplifier to achieve the detection measurement; LDS a Light Detector System in accordance with the spectral characteristics of the light source; Le a lens; LS a Light Source; T - a modulator set to frequency which is not a multiple of 50 Hz or 60 Hz; a terminator
13、to provide a non reflective termination; a removable light proof element of the same length as the specimen; 1) In preparation at the date of publication of this standard. It will substitute for EN 2591. STD-AECMA PREN 2591-bD7-ENGL 1997 D 1012333 0033498 T2L = Page 4 prEN 2591 -607: 1997 I L/2 A ty
14、pical arrangement is shown in figure 1. L/2 Di C I 7 r Specimen /- Removable light proof element / / C c Figure 1 , I 5 Method The method consists of measuring the ambient light coupled in the specimen by the use of an .integrated sphere (see figure 1). 5.1 Procedure Install the specimen in the ligh
15、t proof element. Turn on the LS, C, D, LDS and LA. Insert the specimen with the removable light proof element in the integrated sphere. Adjust the power of LS so that the output power is close to the upper detection limits o measure the output powers Po and Pf. Remove the light proof element. If nec
16、essary, adjust the power of LS again so that new Pvalue Pi is equal to Po. Measure the new power P,. D and then - STD-AECMA PREN 2591-bO7-ENGL 1777 I 1012311 0013Li99 7b8 I Page 5 prEN 2591 -607: 1997 Po = level of optical power launched into the integration sphere after insertion of the removable l
17、ight proof element with the specimen P, = level of optical power launched into the integration sphere after the light proof element has been removed Pf = ambient light coupled in the specimen in the removable light proof element P, = ambient light coupled in the specimen once the light proof element has been removed 5.2 Final measurements and requirements Calculate the external light coupling coefficient with the help of the following equation: e - 4 PO Coupling coefficient (dB) = - NOTE: This calculation assumes that values Po and P, are equal.
