Development and Practical Application of Reflective Property Measurement Method for Retroreflective Materials for Road Signs

A Model of Retroreflective Materials

Fig.1 A Model of Retroreflective Materials

Measurement of reflective properties

Fig.2 Measurement of reflective properties

Measurement alignment

Fig.3 Measurement alignment

sample rotator

Fig.4 sample rotator

Color standards of retroreflective material

Fig.5 Color standards of retroreflective material

Spectral coefficient measurement method of retroreflective materials

Fig.6 Spectral coefficient measurement method of retroreflective materials

  For traffic signs on roads, the materials that reflect a light in the direction of its lighting source (retroreflective materials) are in heavy usage. Such materials with “retroreflective properties” (Fig. 1) are of extremely wide application such as for night road signs for cars, rear reflectors of bicycles, risk prevention signs for work sites, and personal protective clothing for workers on roads.

  For measurements of reflective properties and colors of the materials with retroreflective properties, there had been a difficulty different from that of general light diffusing materials due to their retrodirectivity, but the practical luminous intensity coefficient standards for retroreflective properties have been established (Figs. 2 to 5). The measurement accuracy has been improved significantly by setting the conditions in detail such as irradiation and observation situations. In addition, the development of retroreflective spectral coefficient measurement method (Fig. 6) enabled the measurements of colors and reflective properties of retroreflective materials, and has been help in quality control.

  The Illuminating Engineering Institute of Japan (IEIJ) presented the following award for this development.

1. Award Name: IEIJ Japan Lighting Award “Development and Practical Application of Reflective Property Measurement Method for Retroreflective Materials for Road Signs”

2. Award Winner: Yoshinobu NAYATANI (Osaka Electro-Communication University); Yutaka KURIOKA, Motoi NANJO, Masumi ISHIKAWA, Kyosuke FURUKAWA, Toshio YAMANAKA, (Electrotechnical Laboratory); Takao ASAI (Toshiba Glass Co., Ltd.); Minoru NORIOKA (Kiwa Chemical Industry Co., Ltd.); and Eturo TSUKADA (Japan Vehicle Inspection Association)

3. Awarded Year: 1983


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Illuminating
(Photometry)

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