Comparison of the performance of a microwave based and an NMR based biomaterial moisture measurement instruments

Petri Juhani Österberg, Martti Heinonen, Maija Johanna Ojanen-Saloranta, Anssi Jaakko Mäkynen


This article compares the performance of an NMR-based and a microwave based moisture measurement instruments designed for biomaterials. The conventional moisture measurement method, Loss-on-Drying (LoD) serves as a reference measurement for both instruments. Six different biomaterials at three moisture content levels were measured with the microwave instrument and five biomaterials with the NMR instrument. After instrument calibrations, the difference and variation of the measurement results for parallel samples and the repeatability of the NMR and microwave instruments were estimated. Reasonable agreement between the measurement methods was achieved.

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