Delta PG-40 Specifications download pdf (Page 15)

DELTA LTL-X Retrometer 15

Figure: 3. Measurement field with wet night accessories mounted.

The tower of the LTL-X contains the illuminating and observation system and the control

electronics. At the bottom of the tower an optical system, with mirror, directs a beam of light

toward the road surface through a dust-protection window. A polymer shielding covers the

measuring area for normal operation (see above).

The LTL-X is controlled by multiple microprocessors. It is operated with an extractable key-

board located at the top of the retrometer. It executes the measurement automatically by push

of a button and presents the result on a display. The result is automatically transferred to the

internal memory. The measurement, along with its corresponding time, date, and other data

can be printed using the built-in printer.

Optical principle

The optical system in the LTL-X is covered by a patent pending. A long life xenon lamp in

the top of the tower generates the light for the measurements. After a field stop the light is

collimated by a lens and deflected through a mirror toward the road.

The reflected light from the road uses the same mirror and lens. Between the lens and the pho-

to detector field aperture, stops define the observation area. The illumination field is inside in

the observation field. This is important to assure correct measurement on profiled markings.

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spectral correction is achieved by use of advanced optical filters.

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Delta PG-40 Specifications Page 15