Retroreflection definition and measurement by International Commission on Illumination.

Cover of: Retroreflection definition and measurement | International Commission on Illumination.

Published by Bureau Central de la CIE in Paris .

Written in English

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  • Signal lights.,
  • Signal lights -- Standards.,
  • Light -- Measurement.,
  • Light deflectors.

Edition Notes

Bibliography: p. 28.

Book details

StatementInternational Commission on Illumination.
SeriesPublication CIE -- no. 54
LC ClassificationsTA1250 .I548 1982
The Physical Object
Paginationvi, 28 p. --
Number of Pages28
ID Numbers
Open LibraryOL19020842M
ISBN 109290340541

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Retroreflection: Definition and Measurement Hardcover – July 1, See all formats and editions Hide other Retroreflection definition and measurement book and editions.

Price New from Format: Hardcover. Retroreflection definition and measurement by International Commission on Illumination.,Bureau Central de la CIE edition, in EnglishPages:   Retroreflection definition and measurement by International Commission on Illumination., unknown edition,Pages: Retroreflection definition and measurement bookEdition, - RETROREFLECTION: DEFINITION AND MEASUREMENT There is no abstract currently available for this document.

The purpose of this report is to update and replace CIE Retroreflection: Definition and Measurement. This report is divided into nine main sections. These begin with chapter 2 which is concerned with general definitions of retroreflection, while chapter 3 defines geometrical terms.

The luminance factor is the traditional measure of daylight reflection. Values can be measured in laboratory condi-tions, but are normally measured with handheld instru-ments, which also measure the colour.

The luminance factor under diffuse illumination Qd is the more recent measure. The same unit of mcd⋅m-2⋅lx-1 as for the R L.

Retroreflection Measurement. J By admin. This definition, while not helpful for an intuitive grasp of the nature of luminous intensity, does give us a physical means to establish optical units.

The next important unit is the unit associated with ‘flux’. Flux is a measure of the total light energy emitted per unit of time. CIE Retroreflection: Definition and measurement.

This convention has its origin in glass beaded sheeting materials of the two types of enclosed lens and encapsulated lens. The retroreflective elements of these sheeting materials have symmetries that cause the RA values to show little variation with the two additional angles.

For 40 years, various observatories have pointed powerful laser beams at the moon and detected the light returned by those retroreflectors to accurately measure the distance between Earth and the moon.

Natural Retroreflectors. Retroreflection was observed long. The coefficient of retroreflection describes the amount of light returned and is the result of lab measurements at certain specified entrance and observation angles.

By always measuring materials at the same angle with the same light source, sign sheetings can be compared with one another. Subscribe to Receive Transportation Safety Emails. Measurement of reflection and retroreflection of a surface involves generally reception of reflected light from a field of the surface, when illuminated by a light source.

By means of calibration, the signal from the receiver is ex-pressed as a reflection or retroreflection characteristic, whose definition involves a proportion between a reflected.

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF.

Below is the uncorrected machine-read text. (Redirected from Retroreflection) A retroreflector (sometimes called a retroflector or cataphote) is a device or surface that reflects radiation (usually light) back to its source with minimum scattering.

driving conditions. DELTA\’s retroreflecto-meters can in seconds measure the retroreflection and provide a non disputable result and proof whether a road marking or a road sign meet or fails the standard guidelines.

Retroreflectomers – help spend your maintenance budget more efficiently. Financial resources are limited for most of us. Retroreflection measurement - The Brief history. Prof. Helio Moreira shares his large experience with retroreflectivity measurement since 80's until today and also explains how the new mini.

Measurement of retroreflection 31 Introduction and summary 31 Laboratory measurement of retroreflection 31 Retroreflection measurement with handheld retroreflectometers 37 Mobile equipment for the testing of the retroreflection of installed road signs 42 Literature 45 Annex A: Retroreflectors and retroreflective sheeting.

Retroreflection definition: reflection which takes place with the minimum possible scattering of light | Meaning, pronunciation, translations and examples. Center for High Accuracy Retroreflection Measurements (CHARM) Inthe United States Congress directed the U.S. Department of Transportation to establish "a standard for a minimum level of retroreflectivity that must be maintained for pavement markings and signs which apply to all roads open to public travel." The establishment of a.

Search the world's most comprehensive index of full-text books. My library. retroreflection is based on five measurements. When performing the static test, road markings for daytime and night-time visibility are measured using a handheld.

This paper will analyze the importance of traffic sings retroreflection measurements and give guidelines for this type of measurements with the examples of measurements conducted in Croatia.

Definition and basics of traffic sings retroreflection The only way an object on the road is visible at night is if it is artificially illuminated. The CIE (goniometer) system described in was developed by the Subcommittee on Retroreflection of Committee on Materials of the International Commission on Illumination (Commission International de l'Eclairage, CIE).

It is intended to provide a common basis for the measurement of retroreflection, which should be used worldwide. Retroreflection helps the eye perceive light and color at night and under low-light conditions.

Chicago issues new safety vests One of the early SBIR projects developed a retroreflectometer that uses the principle of retroreflection and a scanning laser beam to measure the retroreflectivity of lane markings.

Captures measurements for any type of retroreflective material and measures to ensure compliance with MUTCD minimum retroreflectivity requirements.

The RoadVista model is a handheld sign retroreflectometer designed for use in the field. It is designed to measure the retroreflection (R A) of road signs and other materials. The purpose of this report is to update and replace CIE 54 - Retroreflection: Definition and Measurement.

This report is divided into nine main sections. These begin with chapter 2 which is concerned with general definitions of retroreflection, while chapter 3 defines geometrical terms. REFERENCES (1) â Guide to the Expression of Uncertainty in Measurement.â International Organization for Standardization, Geneva, Switzerland, First Edition, () pp.

(2) â Retroreflection: Definition and Measurement.â Technical Report CIECommission Internationale De Lâ Ã clairage, Vienna, Austria () 55 pp. (1) Zong. Retroreflection definition is - the action or use of a retroreflector.

What is Retroreflection. Definition of Retroreflection: the reflection that occurs when surfaces return a portion of the directed light to its source. This is why retroreflective materials appear brightest to observers located near the light source – a driver and the vehicle headlights, for example.

This is true for drivers at almost any viewing angle, which makes retroreflective surfaces. E Practice for Describing Retroreflection. E Practice for Measuring Photometric Characteristics of Retroreflectors. E Test Method for Measurement of Retroreflective Signs Using a Portable Retroreflectometer at a Degree Observation Angle.

Other Document. E Practice for Describing Retroreflection. E Practice for Measuring Photometric Characteristics of Retroreflectors. CIE Documents. CIETechnicalReport54 Retroreflection: Definition and Measurement. Keywords. CIE 54 Retroreflection - Definition and measurement DIN Identification colours DIN (all parts) DIN colour chart Munsell Book of Colour NF X Limited collection of colours - Designation and catalogue of CCR colours -Secondary standards.

This test method may be used as a measure of the nighttime performance of horizontally applied surfacing materials used on highway surfaces for lane markings and other traffic control purposes. Since this test method is a laboratory procedure, test specimens must be prepared so that they can be mounted on the specimen holder.

retroreflection definition: Noun (countable and uncountable, plural retroreflections) 1. (physics) reflection in which the reflected rays are parallel to the incident raysOrigin retro- +‎ reflection.

CIE Technical ReportRetroreflection: Definition and Measurement, published inoffers several methods for measuring the coefficient of retroreflected luminance. In this experiment, two CIE methods, The Ratio Method and The Direct Luminance Method, along with a new method, Total Luminous Flux Method, are compared in the.

Define retroreflection. retroreflection synonyms, retroreflection pronunciation, retroreflection translation, English dictionary definition of retroreflection. n reflection which takes place with the minimum possible scattering of light Collins English Dictionary –.

There is practically no official information regarding the measurement bias and repeatability of handheld retroreflectometers. The Retroreflection Subcommittee of ASTM E12 (Color and Appearance) has been working on developing a precision and bias statement for. Definition of retroreflection in the dictionary.

Meaning of retroreflection. What does retroreflection mean. Information and translations of retroreflection in the most comprehensive dictionary definitions resource on the web.

Retroreflection: Definition and Measurement (CIE ). AUSTRIA: CIE Central Bureau (). [2] JT/TTest method for photometric characteristics of retroreflectors (In Chinese). Retroreflective definition, of or relating to a surface, material, or device (retroreflector) that reflects light or other radiation back to its source; reflective.

See more. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected.

When you think of reflective, think of a mirror. Where a retroreflective surface is like the reflector you would find on something simple, like a bike reflector. To understand what “Retro” is, let’s look at a definition: “ denoting action that is directed fed std 0 instrumental photometric measurements of retroreflective materials and retroreflective devices from sai global.3M is a pioneer in developing the science behind retroreflection and has been advancing the technology in new and groundbreaking ways for over 70 years.

With more than 35 different products, including many high performance options, 3M™ Scotchlite™ Reflective Material offers one of the largest and most diverse portfolios in the industry.

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