Infrared thickness measurement system

Near-infrared (NIR) thickness gauges exploit selective absorption by C–H and O–H bonds in organic materials, with absorbance proportional to bond concentration. Using NIR photodetectors, they measure areal density (basis weight), thickness (via density conversion when consistent), or moisture content. This technology offers high accuracy, minimal sensitivity to probe standoff or angle, and is especially effective for transparent/semitransparent organic coatings and moisture measurement. It enables integrated online measurement of both areal density/thickness and moisture in a single system, delivering cost-effective, high-precision, real-time performance.

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