发明名称 |
Pavement material microwave density measurement methods and apparatuses |
摘要 |
A method of obtaining a material property of a pavement material from a microwave field generally includes generating a microwave frequency electromagnetic field of a first mode about the pavement material. The frequency response of the pavement material in the electromagnetic field can be measured, such as by a network analyzer. The measurement of the frequency response permits correlating the frequency response to a material property of the pavement material sample, such as the density. A method of correcting for the roughness of a pavement material divides the pavement into a shallow layer and a deep layer. Two planar microwave circuits measure the permittivity of the shallow and deep layer. The permittivities are correlated to correct for roughness. An apparatus for obtaining the density of a pavement sample includes a microwave circuit and a network analyzer. The network analyzer measures the frequency response to determine the density of the pavement material. |
申请公布号 |
US8400168(B2) |
申请公布日期 |
2013.03.19 |
申请号 |
US20070712060 |
申请日期 |
2007.02.28 |
申请人 |
TROXLER ROBERT ERNEST;JOINES WILLIAM T.;TROXLER ELECTRONIC LABORATORIES, INC. |
发明人 |
TROXLER ROBERT ERNEST;JOINES WILLIAM T. |
分类号 |
G01R27/26;E01C5/16;G01N22/00;G01N22/04;G01N33/38;G01N33/42 |
主分类号 |
G01R27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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