July, 2020

Solving the Challenges of Assessing Road Luminance

Continued from previous page

laboratory meters and performing measurements with them is cumber- some.

Complete ILMD System An ILMD should be a compre-

hensive system for imaging measure- ment of luminance distribution with particular emphasis on the measure- ment of road lighting in accordance with the requirements of EN 13201 and in laboratory applications. The system should offer self-

exposure adaptation, based on a pro- gram that analyzes the meter’s view field in real time. It should also elim- inate the high-level luminance fields from the analysis. This allows a pre- cise adjustment of the matrix expo- sure time to the range of luminance occurring on the measured road sur- face.

Measurements of luminance

distribution on the road is made by placing the ILMD in the center of traffic lanes. The optical system of the ILMD meter enables measure- ments with appropriate angular res- olution corresponding with the reso- lution of the human eye, under condi- tions of adaptation to the luminance

The optical system of

the ILMD meter enables measurements with appropriate angular

resolution corresponding with the resolution of the human eye, under

conditions of adaptation to the luminance levels occur- ring on a road illuminated by artificial light.

levels occurring on a road illuminat- ed by artificial light. The complete imaging lumi-

nance measuring system consists of an ILMD and also peripheral devices that allow comfortable measurement of luminance distribution on roads, without requiring special expertise. The imaging luminance meters

available on the market are expen- sive, complicated to operate and are not fully adapted to perform lumi- nance measurements on roads in accordance with the requirements of EN 13201. The ILMD system includes: a

reliable power supply, tags to mark the measurement field, adapted optics; an integrated module that enables efficient set up of the meas- urement system in a given position by a single person, taking into account the requirements of EN 13201; a convenient system for meas- uring the distance between the meter and the beginning of the measure- ment field; and user-friendly soft- ware that quickly obtains the results to assess the quality of road lighting, according to EN 13201 in real time.

Using the ILMD To correctly measure the distri-

bution of luminance on the road to the EN 13201 standard, the field between two successive luminaires should be chosen and the measured

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distance should be straight — though this is rarely the case in practice. When analyzing the measure-

ment results, check that the measur- ing points to not overlap with the road markings, such as the lane dividers. The road behind the meas- uring field should be illuminated at a distance of at least twelve times the height of the lamp post. The next step is to mark the measuring field correctly. The mark-

ers of the measuring field should clearly indicate the actual bound- aries of the area to be measured. This is necessary for the positioning of the calculation points during the analy- sis of the image recorded with the matrix luminance meter. The next thing to pay attention

to is the position of the meter during the measurements. The meter should be 5 ft (1.5m) above the road surface and 197 ft (60m) in front of the meas-

uring field. The optics must be capa- ble of measuring the entire width of the road. Finally, the appropriate exposure time must be chosen, according to the measuring field’s luminance. Contact: GL Optic,

Tobelwasenweg 24, 73235 Weilheim/Teck, Germany % +49-0-7023-9504-20 E-mail: Web: r

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