french institute of science and technology for transport ... - Ifsttar
french institute of science and technology for transport ... - Ifsttar
french institute of science and technology for transport ... - Ifsttar
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3_APPLICATION OF RESEARCH FINDINGS, TIES WITH INDUSTRY AND EXPERT APPRAISALS<br />
Photometric <strong>and</strong><br />
colorimetric tests<br />
on road equipment<br />
The Phototmery <strong>and</strong> Colorimtry Laboratory (LDPC) which<br />
is part <strong>of</strong> the LEPSIS unit is responsible <strong>for</strong> characterizing<br />
the per<strong>for</strong>mance <strong>of</strong> road equipment (signing, lighting)<br />
in terms <strong>of</strong> visibility <strong>for</strong> the purposes <strong>of</strong> research,<br />
development, st<strong>and</strong>ardization <strong>and</strong> regulation. It also<br />
conducts tests <strong>for</strong> certification bodies such as ASQUER<br />
or directly <strong>for</strong> industry <strong>and</strong> is endowed with major technical<br />
facilities <strong>for</strong> this purpose.<br />
its operation. The modified device came into service in 2011. It<br />
determines the Bidirectional Reflection Distribution Functions<br />
(BRDF) <strong>of</strong> surfaces <strong>and</strong> is used to characterize pavement surfacings.<br />
In the near future this test set may be used by lighting<br />
experts or motor vehicle accessory manufacturers.<br />
@ CONTACT<br />
enoch.saint-jacques@ifsttar.fr<br />
78<br />
The LDPC has two goniometers with two angles <strong>of</strong> rotation<br />
in order to evaluate the per<strong>for</strong>mance <strong>of</strong> Variable Message<br />
Signs (VMS) <strong>and</strong> traffic signals (luminous intensity, angular visibility,<br />
colour, uni<strong>for</strong>mity, phantom effect). A gonioreflectometer<br />
with 4 angles <strong>of</strong> rotation is used to test retroreflective materials<br />
(surfaces containing glass beads or microprisms used in retroreflective<br />
vertical signing, delineators, studs <strong>and</strong> fabrics). It<br />
also owns a test set <strong>for</strong> measuring the spectral/bispectral <strong>and</strong><br />
colorimetric properties <strong>of</strong> surfaces.<br />
Last, it has made considerable mechanical modifications to i a<br />
gonioreflecotmeter with 3 angles <strong>of</strong> rotation in order to improve<br />
Table setting out test activities in 2011.<br />
Type <strong>of</strong><br />
product tested<br />
Retroreflective<br />
films<br />
Number<br />
1 087<br />
Client<br />
ASCQUER, AVERY,<br />
SCR PLASTIQUE<br />
Traffic signs 73 ASCQUER<br />
Retroreflective<br />
fabrics<br />
Traffic signals 30<br />
Variable<br />
Massage Signs<br />
(VMS)<br />
217 IFTH, CORA<br />
20<br />
AXIMUM, LACROIX<br />
TRAFIC, SEA, ECI,<br />
IGNIDON<br />
SIGNATURE, ARP<br />
SIGNAL, OPTIFIB,<br />
MERCURA<br />
Evaluation<br />
<strong>of</strong> the photometric<br />
<strong>and</strong> colorimetric<br />
per<strong>for</strong>mance <strong>of</strong> a<br />
traffic signal head.<br />
ifsttar French Institute <strong>of</strong> Science <strong>and</strong> Technology <strong>for</strong> Transport, Development <strong>and</strong> Networks
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