Sponsored by Lambient TechnologiesMay 28 2021
Both AC and DC techniques can be utilized to analyze thermoset and composite cure. AC dielectric cure monitoring, also known as
Dielectric Analysis (DEA) agitates a sensor with a sinusoidal signal of a particular frequency and amplitude, applying a DC bias of zero volts. The measured frequency independent resistance, or
ion viscosity, corresponds to the cure state of the Material Under Test (MUT). Similarly, DC resistance cure monitoring probes a material but alternatively uses a excitation voltage V
DC that remains constant. AC and DC signals. Image Credit: Lambient Technologies
AC and DC cure monitoring are complimentary, yet electrochemical reactions can influence DC results. Comparatively, AC measurements have no DC bias and zero average current, and do not endure electrochemical effects. While DC techniques can quantify cure state, they must be carefully utilized with a good understanding of their potential.