Dielectric or non-conducting materials, like most plastics, cloth, ceramics, papers and similar materials are transparent for Terahertz waves, while metallic and conducting surfaces act as mirrors. These properties allow the image reconstruction of density interfaces and distributions in non-conducting materials.

For the application discussed here, the high sensitivity towards conducting materials, i.e. water, has the potential for a precise evaluation of the gradient of water or to detect the moisture level.

As an example used here, a pasta plate (Lasagna) was measured in reflection and in transmission within a single measurement. The wet sample was created by putting water on the dry pasta plate. As is shown in detail in the application note, Terahertz imaging is suitable for the detection of the gradient of water content in non-conducting structures. The results are also valid for other materials like cork, wood, paper, etc.

Please download the application note for further details.

Attachments:

Water and Moisture Detection

[Application Note]

1386 Kb

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