Method and apparatus for determining deflection in pavement

Details Method and apparatus for determining deflection in pavement Method and apparatus for determining deflection in pavement

1987-11-13

1988-12-06

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

356356, 356375, 364550, G01B 530

Patent

active

047888598

ABSTRACT:
A method for direct measurement of the vertical displacement of a point on the surface of pavement upon application of a load thereto is disclosed. This method measures the vertical displacement through the use of optical equipment. Specifically, the displacement is equivalent to the vertical movement of an optical focusing element between the position of the element when a point on the surface of the pavement is in focus with and without the application of the load. This point linear displacement measurement can also be applied to the calculation of a volumetric displacement. An apparatus capable of carrying out these methods is also described.

REFERENCES:
patent: Re27875 (1974-01-01), Swift
patent: 4456829 (1984-06-01), Fohey
patent: 4571695 (1986-02-01), Elton et al.

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