Moisture measurements in building materials with microwaves

Hannu Kääriäinen (Corresponding Author), M. Rudolph, Dieter Schaurich, Kauko Tulla, Herbert Wiggenhauser

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)


The method requires two parallel boreholes in the specimen in which two microwave antennae can be moved. The moisture content in the material can be calculated from the microwave intensity transmitted between the two boreholes. Moisture profiles along the boreholes can be obtained by moving the antennae in steps along the length of the boreholes and taking measurements at each step.

The microwave frequencies used in the laboratory measurements ranged from 8 to 16.5 GHz in steps of 0.5 GHz. The diameters of the antennae were between 7 and 9 mm, and of the boreholes between 8 and 12 mm. The microwave method produced measurement uncertainties between 0 and 2% by volume for all the materials studied in this report.
Original languageEnglish
Pages (from-to)389-394
JournalNDT & E International
Issue number6
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed


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