Meter (Circular Track Meter)
This is a device to measure pavement
macrotexture. It is a non-contact style macrotexture measuring
device using a charge coupled laser-displacement sensor. The
C.T. Meter reports the Mean Profile Depth (MPD) and the Root
Mean Square (RMS). The IFI (International Friction Index)
can be computed in using the C. T. Meter with the D.F. Tester.
ASTM Name : Circular Track Meter
||Very small, light weight
(approx. 13 kgs.) and easy to operate. It can measure
||Short time for a measurement
(approx. 45 seconds). It is not operator dependent.
||An automobile battery (12V
DC, 24W) is used for power supply.
||The number of samples per
one rotation is divided into 8 segments for computation
of each MPD and/or RMS. The overall MPD can also be obtained.