Measurement principle and application characteristics

Near-infrared (NIR) light of specific wavelengths is selectively absorbed by C-H bonds in organic materials or H-O bonds in water molecules, and the absorption capacity is positively correlated with the number of molecular bonds in the material. The NIR thickness gauge utilizes this principle by detecting the amount of NIR light absorbed by the material through an NIR photodetector to measure the areal density (thickness) of the material or its moisture content.

Measurement Method: Transmission absorption measurement using near-infrared light.

Measured Physical Quantity: Areal density (basis weight). When the bulk density of the material is relatively consistent, the thickness of the material can be determined by converting the bulk density (areal density = density × thickness).

The NIR thickness gauge offers high measurement accuracy and is minimally affected by changes in the spacing and angle between the probe and the material being measured. It has unique advantages for measuring transparent or semi-transparent organic coatings and is also an ideal method for determining moisture content in materials.

The NIR thickness gauge can simultaneously perform integrated measurements of areal density/thickness and moisture content. This means that a single thickness gauge system can achieve online measurement of both areal density (thickness) and moisture content, truly enabling low investment, high precision, and efficient online measurement.

Technical features and powerful software function modules

Developed by Huawei software architects and big data experts, the next-generation online measurement software system offers more powerful functionality and more scientific algorithms.

Key Features:

Online measurement of areal density/thickness consistency and moisture content.

Supports scanning measurement, fixed-point measurement, and cyclic fixed-point measurement.

Real-time display of rich measurement curves, including single/multiple profile lines, partition lines, and trend lines, along with various quality data. Comprehensive full-value data storage in Excel format based on a database, enabling historical data query, traceability, and historical curve replay.

Professional-grade SPC statistical analysis, automatic generation of quality reports, and customization based on customer requirements.

Real-time process monitoring, five-line quality control, multi-level warnings and alarms, and out-of-limit marking.

Remote monitoring, remote data management, and remote multi-machine management.

Application:

Adhesive tape, adhesive products, plastic film, paper, non-woven fabric, instant sticker, single-back adhesive paper, label paper, organic coating