ASTM E2540-2016 Standard Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a 0 5 Degree Observation Angle《用手持式逆反射测量仪在0 5度的观测角度测量反光标志的标准试验方.pdf
《ASTM E2540-2016 Standard Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a 0 5 Degree Observation Angle《用手持式逆反射测量仪在0 5度的观测角度测量反光标志的标准试验方.pdf》由会员分享,可在线阅读,更多相关《ASTM E2540-2016 Standard Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a 0 5 Degree Observation Angle《用手持式逆反射测量仪在0 5度的观测角度测量反光标志的标准试验方.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E2540 08E2540 16Standard Test Method forMeasurement of Retroreflective Signs Using a PortableRetroreflectometer at a 0.5 Degree Observation Angle1This standard is issued under the fixed designation E2540; the number immediately following the designation indicates the year oforiginal ado
2、ption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers measurement of the retroreflective properties o
3、f sign materials such as traffic signs and symbols(vertical surfaces) using a portable retroreflectometer that can be used in the field. The portable retroreflectometer is a hand-heldinstrument with a defined standard geometry that can be placed in contact with sign material to measure the retrorefl
4、ection in astandard geometry. The measurements can be compared to minimum requirements to determine the need for replacement. Entranceand observation angles specified in this test method are those used currently in the United States and may differ from the anglesused elsewhere in the world.1.2 This
5、test method is intended to be used for the field measurement of traffic signs but may be used to measure theperformance of materials before placing the sign in the field or before placing the sign material on the sign face.1.3 The values stated in SI units are to be regarded as standard. No other un
6、its of measurement are included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of reg
7、ulatorylimitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organ
8、ization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE284 Terminology of AppearanceE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test MethodE808
9、 Practice for Describing RetroreflectionE809 Practice for Measuring Photometric Characteristics of RetroreflectorsE810 Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry3. Terminology3.1 The terminology used in this test method generally agrees
10、 with that used in Terminology E284.3.2 DefinitionsThe delimiting phrase “in retroreflection” applies to each of the following definitions when used outside thecontext of this or other retroreflection standards.3.2.1 annular geometry, nthe portable instrument retroreflection collection method where
11、the retroreflected lux is collected inan annulus 0.1 degrees wide centered on the illumination axis.3.2.1.1 Discussion1 This test method is under the jurisdiction ofASTM Committee E12 on Color andAppearance and is the direct responsibility of Subcommittee E12.10 on Retroreflection.Current edition ap
12、proved April 15, 2008Nov. 1, 2016. Published May 2008April 2017. Originally approved in 2008. Last previous edition approved in 2008 as E2540 08. DOI: 10.1520/E2540-08.10.1520/E2540-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm
13、.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
14、it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr
15、 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1The angle measured from the illumination axis to the circle which divides the annulus into equal areas corresponds to a specificobservation angle.3.2.2 coeffcient of retroreflection, RA, nof a plane retroreflecting surface,
16、the ratio of the coefficient of luminous intensity (RI)of a plane retroreflecting surface to its area (A), expressed in candelas per lux per square metre (cd lx1 m2).3.2.3 datum axis, na designated half-line from the retroreflector center perpendicular to the retroreflector axis.3.2.4 entrance angle
17、, , nthe angle between the illumination axis and the retroreflector axis.3.2.5 entrance half-plane, nthe half plane that originates on the line of the illumination axis and contains the retroreflectoraxis.3.2.6 instrument standard, nworking standard used to standardize the portable retroreflectomete
18、r.3.2.7 observation angle, , nthe angle between the illumination axis and the observation axis.3.2.8 observation half-plane, nthe half plane that originates on the line of the illumination axis and contains the observationaxis.3.2.9 orientation angle, s, nthe angle in a plane perpendicular to the re
19、troreflector axis from the entrance half-plane to thedatum axis, measured counter-clockwise from the viewpoint of the source.3.2.10 portable retroreflectometer, na hand-held instrument that can be used in the field or in the laboratory for measurementof retroreflectance.3.2.10.1 DiscussionIn this te
20、st method, “portable retroreflectometer” refers to a hand-held instrument that can be placed in contact with sign materialto measure the retroreflection in a standard geometry.3.2.11 presentation angle, , nthe dihedral angle from the entrance half-plane to the observation half-plane, measuredcounter
21、-clockwise from the viewpoint of the source.3.2.12 retroreflection, na reflection in which the reflected rays are returned preferentially in directions close to the oppositeof the direction of the incident rays, this property being maintained over wide variations of the direction of the incident ray
22、s.3.2.13 rotation angle, , nthe angle in a plane perpendicular to the retroreflector axis from the observation half-plane to thedatum axis, measured counter-clockwise from the viewpoint of the source.3.3 Definitions of entrance angle components 1 and 2, as well as other geometrical terms undefined i
23、n this test method, maybe found in Practice E808.4. Summary of Test Method4.1 This test method involves the use of commercial portable retroreflectometers for determining the retroreflectivity ofhighway signing materials.4.2 The entrance angle shall be 4.4.4.3 The observation angle shall be 0.5.4.4
24、The portable retroreflectometer uses an instrument standard for standardization.4.5 After standardization, the retroreflectometer is placed in contact with the sign to be tested, ensuring that only the desiredportion of the sign is within the measurement area of the instrument.4.6 The reading displa
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTME25402016STANDARDTESTMETHODFORMEASUREMENTOFRETROREFLECTIVESIGNSUSINGAPORTABLERETROREFLECTOMETERATA05DEGREEOBSERVATIONANGLE

链接地址:http://www.mydoc123.com/p-531353.html