Delta LTL2000S Specifications download pdf (Page 15)

DELTA LTL2000S(Q) Retroreflectometer 11

SECTION 2

GENERAL INFORMATION

Rl Measurement

The Rl part of the LTL2000S(Q) Retroreflectometer measures the Rl (coefficient of retro re-

flected luminance) parameter. The Rl parameter represents the brightness of the road mark-

ings seen by drivers of motor vehicles by headlight illumination.

The illumination angle is 1.24° and the observation angle is 2.29° simulating a drivers view-

ing distance of 30 metres at an eye height of 1.2 metres. The observation area is app. 45 mm.

x 200 mm.

The optical specification complies with EN1436. The spectral sensitivity is eye matched us-

ing SMART optical filter designed and produced by DELTA. The functional layout of the

LTL2000S(Q) Rl optical system is shown in figure 3 below.

A very efficient electronic stray light compensation eliminates false signals from daylight.

101

102

103

104

107

108

109

105

106

112

111

110

Figure 3: LTL2000S(Q) RL optical system layout

101 Light source

102 Receiver and spectral matching

filter

103 Illumination aperture stop

104 Observation aperture stop

105 Illumination beam

106 Observation beam

107 Collimating lens

108 Mirror

109 Beam splitter

110 Road marking surface

111 Illumination field

112 Observation field

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Delta LTL2000S Specifications Page 15