Delta LTL2000S Specifications download pdf (Page 19)

DELTA LTL2000S(Q) Retroreflectometer 15

Figure 6: The LTL2000S(Q) illuminations/measurement fields ( 5mm profile capabil-

ity) compared to a system with identical fields (< 0.5 mm profile capability) clearly

shows the advantage of the LTL2000S(Q) for obtaining reliable and reproducible meas-

urements on real markings.

Qd Measurement

The Qd part of the LTL2000SQ Retroreflectometer measures the Qd (coefficient of diffuse

reflected luminance) parameter. The Qd parameter represents the Lightness of road surfaces

and road markings seen by drivers of motor vehicles under daylight conditions or with sta-

tionary lighting.

The Qd measurement function of the LTL2000SQ complies with the EN1436 for normal non-

glossy road markings with a maximum profile. For measurement on glossy road markings or

markings with a profile height exceeding 2 mm please contact DELTA.

The illumination system recommended in EN1436 for obtaining the diffuse illumination for

measuring of Qd is an integrating sphere but it is also stated that other illuminations systems

can be used if similar results are obtained. The very compact illumination systems in

LTL2000SQ is a result of a considerable research effort at DELTA using advanced optical

simulation programs. The patent pending illumination system is shown in figure 7. The re-

sults obtained with this illumination system is in close agreement with results obtained on Qd

measurements using an integrating sphere systems as Qd30 for normal non-glossy road

markings with a profile height up to 2 mm. For further information regarding this matter

please contact DELTA.

Before tilt /shift of high position

After tilt/shift of high position

Area not measured

LTL2000

Competitor

LTL2000

Competitor

5 mm profile capability.

< 0.5 mm profile capabilt

5 mm profile capability.

< 0.5 mm profile capabilt

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 44 45

No comments

Delta LTL2000S Specifications Page 19