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Delta LTL2000S Spécifications Page 13

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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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