April 23, 2021

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Dynamic Mechanical Analyzer (DMA)

Dynamic Mechanical Analyzer (DMA)

On the right is the Perkine Elmer DMA 7e

The Dynamic Mechanical Analyzer (DMA) can be used to measure dimensional and viscoelastic changes as a function of temperature or time. The DMA is also capable of measuring the viscoelastic changes as a function of periodic changes in the stress applied to the sample. The DMA primarily consists of three components: the Linear Variable Differential Transformer (LVDT), the furnace and the linear motor for probe loading. The LVDT measures displacement by detecting a change in voltage caused by the movement of a probe through a magnetic core. The change in voltage is related to the displacement of the probe. The top section of the LVDT is the linear motor which provides the load for the static force used during the runs.