Delta LTL2000S Specifications download pdf (Page 13)

DELTA LTL2000 Retrometer 7

SECTION 2

GENERAL INFORMATION

Rl Measurement

LTL2000 Retrometer measures the Rl (coefficient of retro reflected luminance) parameter. The Rl

parameter represents the brightness of the road markings seen by drivers of motor vehicles by headlight

illumination.

In the LTL2000 the illumination angle is 1.24° and the observation angle is 2.29° simulating a drivers

viewing distance of 30 metres at an eye hight of 1.2 metres. The observation area is app. 45 mm. x 200

mm.

Physically the Retrometer is dominated by the 'control' tower. The tower contains the illuminating and

observation system and the control electronics. At the bottom of the tower an optical system, with

mirrors, directs the beams towards the road surface through a dust-protection window. The measuring

area is shielded by an aluminium housing with a rubber skirt and a light trap.

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Delta LTL2000S Specifications Page 13