Measuring and testing – Hardness – By penetrator or indentor
Patent
1985-09-16
1987-04-21
Levy, Stewart J.
Measuring and testing
Hardness
By penetrator or indentor
73146, 364506, G01N 340
Patent
active
046586393
ABSTRACT:
A method and apparatus are provided for measuring the load bearing capacity of a surface by continuously transporting a known load along the surface and measuring the resulting deformation thereof. In one embodiment a contactless laser transducer is mounted directly in front of and behind a loaded wheel for measuring the elevation of the surface before and after the load. A computer determines the difference between the measured elevations which is indicative of the load bearing capacity of the surface. Conventional recording, display, and storage equipment are provided for recording, displaying, and storing the elevation values and the corresponding differences. The load velocity and longitudinal position may also be determined and stored with the corresponding elevation and difference values. In another embodiment, the contactless laser transducers directly in front of and behind the loaded wheel are replaced with racks of laser transducers which also extend laterally of said wheel to produce transverse elevational surface profiles in place of individual elevation points directly in front of and behind the wheel.
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Sammenlignende baereevnem.ang.linger med forskelligt inventeringsundstyr ("Comparative Carrying Capacity with Various Data Gathering Equipment"); Report No. 124; 48 pages; State Highways Laboratory; Jul. 1981; in Swedish.
VEGERS BAEREEVNE (Carrying Capacity of Roads); Delprosjekt 2; Erling Reinslett, Directorate of Roads, Road Laboratory, Oslo, Norway; Dec. 1982; 120 pages; in Norwegian.
Variation av barigheten i vagens tvarprofil; (Variation of the Carrying Capacity in Transverse Profile of the Road); Research Report No. 122; Anssi Lampinen, State Technical Research Center, Esbo; Sep. 1983; 49 pages; in Swedish.
Bohler William J.
Levy Stewart J.
Noland Tom
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