| 摘要 |
The present invention relates to a method and an apparatus for determining the degree of hardness of semisolid materials, in particular the present invention relates to a penetrometer for the measurement of the degree of hardness of road surfaces such as asphalt or for the measurement of the degree of hardness of lubricants. It is an object of the present invention to provide an apparatus and a method that allow a determination of the degree of hardness of semisolid materials with a higher accuracy and a simultaneously lower sensitivity with respect to electronic and mechanical disruptions in comparison to the prior art. According to the present invention an adjusted force value (FBer) is determined prior or during a downward movement of a force/path sensor (20) and the force difference (&Dgr;F32−&Dgr;F51) is determined between the adjusted force value (FBer) and respective measured force value (&Dgr;F32−&Dgr;F51) and a zero time (t41) is determined, wherein the position (21, s41) of the measuring body (5, 8) at the zero time (t41) is used as the exact starting position (21, s41) of the surface of the material to be measured (22).
|
