ASTM E1390-2006 Standard Specification for Illuminators Used for Viewing Industrial Radiographs《观察工业X光照片用照明装置标准规范》.pdf

1、Designation: E 1390 06Standard Specification forIlluminators Used for Viewing Industrial Radiographs1This standard is issued under the fixed designation E 1390; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis

2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 The function of the illuminator is to provide sufficientillumination and viewing capabilities for the purpose of iden-tificatio

3、n and interpretation of radiographic images. This speci-fication provides the recommended minimum requirements forIndustrial Radiographic Illuminators used for viewing indus-trial radiographic films using transmitted light sources.1.2 The illuminator has to ensure the same safety forpersonnel, or us

4、ers of any electric apparatus, as specified byelectrical standards applicable in the country in which theilluminator is used.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish app

5、ro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.4 Values stated in SI units are to be regarded as thestandard. The values given in parenthesis are provided forinformation only.2. Referenced Documents2.1 ASTM Standards:2E 1316 Terminolog

6、y for Nondestructive Examinations3. Terminology3.1 Definitions:For definitions of terms used in this specification, seeTerminology E 1316.4. Ordering Information4.1 This specification is intended to be used by the manu-facturers and purchasers of radiographic illuminators. Require-ments, if imposed

7、on manufacturers, should be established bycontractual agreement or appropriate purchase document.5. Materials and Manufacture5.1 GeneralThe illuminator shall consist of a housingwith one or more of the sides containing a viewing screenilluminated from the inside of the housing. The viewing screenmay

8、 also be the diffusing screen. There shall be thermalprotection to prevent overheating, and subsequent damage tothe radiographs placed on the viewing screen. The housing orsystem may or may not require ventilation. A rheostat orsuitable electrical circuit shall be provided to vary the lightintensity

9、.6. Physical Properties6.1 GeneralThe illuminator shall be manufactured ofmaterials deemed suitable to withstand the environmentalconditions encountered under normal operating conditions.6.2 Viewing ScreenThe viewing screen shall be easy toclean and made of material which is resistant to scratches.

10、Thesize of the screen shall allow the user to view the radiographwithout excessive glare. If the illuminator is to be used forviewing radiographs of various sizes, masks of various sizesand configurations shall be provided. Alternately, an adjustableaperture may be used.6.3 Color of LightThe color o

11、f the light used to illuminatethe radiograph shall be white, that is, color temperaturebetween 5000 and 6250K. However, illuminators using non-white or “colored” light may be used if they have beenrecommended by the film manufacturers.6.4 Diffusing ScreenIf the illuminator has a diffusingscreen, the

12、 light shall be sufficiently divergent so that both eyesof the observer receive rays from all parts of the screen.6.5 HousingThe external housing shall be constructed insuch a manner that no disturbing light hinders the viewing ofthe radiographs.6.6 Anti-Glare DeviceThe illuminator shall be fitted w

13、ithan anti-glare switch or device that minimizes the probability ofthe operator being subjected to excessive glare when theradiograph is removed. This switch or device may be manual orautomatic.1This specification is under the jurisdiction of ASTM Committee E07 onNondestructive Testing and is the di

14、rect responsibility of Subcommittee E07.01 onRadiology (X and Gamma) Method.Current edition approved Dec. 1, 2006. Published January 2007. Originallyapproved in 1990. Last previous edition approved in 2000 as E 1390 - 90 (2000).2For referenced ASTM standards, visit the ASTM website, www.astm.org, or

15、contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.7 Illuminators U

16、sed for Viewing “Wet” RadiographsIlluminators manufactured for use in viewing “wet” radio-graphs shall be manufactured to prevent the penetration ofliquid into internal electrical components in such a manner thatsafe operation of the unit would be compromised.7. Performance Requirements7.1 Maximum L

17、uminance outputThe luminance of thetransmitted light shall not be less than 30 candelas per squaremetre for film densities equal to or less than 2.5 optical densityand not less than 10 candelas per square meter for filmdensities greater than 2.5 optical density.7.2 Divergence and Diffusion of LightI

18、f the illuminatorhas a diffusing screen, the light shall be sufficiently divergentso that both eyes of the observer receive rays from all parts ofthe screen. The divergence factor shall exceed 0.7.7.3 The viewing screen shall be uniformly illuminated withthe uniformity factor d being higher than 0.5

19、,:7.4 Appropriate precautions shall be taken by the manufac-turer to ensure that temperature of the housing does not exceed60C (140F) at the usual contact surfaces after one hour ofoperation at a 50 % duty cycle.7.5 A radiograph having a density of 2.0 optical densitywhen placed onto the illuminator

20、 viewing surface shall notwarp or curl after one minute of continuous viewing time andone hour of operation of the illuminator at a 50 % duty cycle.8. Scope8.1 The following tests shall be utilized to verify theperformance requirements specified in 7.1 through 7.3 of thisspecification.8.1.1 Maximum

21、illuminator luminance shall be determinedusing a calibrated photometer placed at the center of theviewing surface, and shall be measured in accordance with thedirections specified by the photometers manufacturer.8.1.2 Maximum illuminator luminance measurements are totake place in a room with less th

22、an 20 lux (approximately 2footcandles) of background light. Light escaping from theilluminator even when the viewing screen is completelymasked shall not affect the measurements.8.2 Divergence and Diffusion of LightIf the illuminatorhas a diffusing screen, the light shall be sufficiently divergentso

23、 that both eyes of the observer receive rays from all parts ofthe screen. The divergence factor shall exceed 0.7.8.2.1 The brightness shall be measured on a semi-circle, thecenter of which is center of the screen.8.2.2 The diameter of the circle is approximately the sameas the maximum dimension of t

24、he screen (the diagonal). Theradius of this semi-circle should be at least 25 cm (10 in.).8.2.3 The brightness is measured with the aid of an appro-priate luminance photometer whose sensitive surface is tangentto the curve of the circle (see Fig. 1). These measurements shallbe made at angles of 5 (L

25、5), 20 (L20), and 45 (L45) relativeto the normal (L0) to the diffusing screen. The divergencefactor, s, shall be calculated according to the followingequation:s 5L451 L202 L58.3 The viewing screen shall be uniformly illuminated withthe uniformity factor d being higher than 0.5, and calculated inthe

26、following manner:8.3.1 The measurements shall be made with the aid of anillumination photometer or other suitable instrument.8.3.2 If the screen is rectangular, it shall be divided intosquares, each side of the squares measuring 3.5 cm, theluminance of each being measured separately. If the screen i

27、scircular, the same basic procedure shall be followed. In bothcases, the network of the squares shall be so arranged that themiddle square is centered in the middle of the screen.8.3.3 The average of the four highest and the average of thefour lowest results shall be found, which give the averageari

28、thmetical values of the luminance Lmaxand Lmin. Theuniformity factor g shall then be calculated according to theformula:d5LminLmax9. Certification9.1 The manufacturer is responsible for certifying that theilluminator conforms to the requirements of this specificationprior to shipping to customer.9.2

29、 At the request of the customer, the manufacturer of theilluminator shall provide a written statement indicating con-formance to the requirements of this specification and testresults if requested.10. Product Marking10.1 Each illuminator will have the following informationpermanently affixed by the

30、manufacturer:10.1.1 Nominal operating voltage or permissible voltagerange.10.1.2 Nominal line frequency or permissible frequencyrange.10.1.3 Whether direct, alternating current, or both may beused.10.1.4 Whether designed for use with “wet” film viewing.10.1.5 Nominal power consumption.10.1.6 Maximum

31、 brightness in candelas per square metre ascalculated during factory acceptance tests.FIG. 1 Measurement Angles of Diversion and Dispersion of LightE139006211. Packaging and Package Marking11.1 Each illuminator will be provided with operatinginstructions that address the following:11.1.1 Safety prec

32、autions to be expected during the normaloperating conditions.11.1.2 Operating conditions.11.1.3 Instructions for mounting and replacements of lampsand screens.11.1.4 Care and recommended maintenance procedures.11.1.5 Replacement lamp and screen identification and sup-plier contact information.12. Qu

33、ality Assurance12.1 The manufacturer is responsible for testing and certi-fying that the illuminator conforms to the requirements of thisspecification prior to shipping to customer.13. Keywords13.1 illuminator; luminance; radiographASTM International takes no position respecting the validity of any

34、patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revis

35、ion at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your c

36、omments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrig

37、hted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E1390063