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Ningbo Prus Instrument Technology Co., Ltd
Parameter Setting and Method Adjustment of Coating Thickness Tester
Date: 2025-10-23Read: 0
Coating thickness detectorEfficient application is an art that combines standard parameter settings with dynamic method adjustments. Operators not only need to understand the principles of the instrument and be familiar with menu functions, but also need to accumulate rich practical experience and be able to make accurate judgments and optimizations based on the specific conditions of the sample, from material, shape to thickness range. Only in this way can we ensure that this precision instrument continuously outputs accurate and reliable data that represents quality and reputation in harsh industrial environments.
1、 Core parameter setting: Building the foundation for accurate measurement
The parameter setting of the coating thickness detector is the first step in measurement, which directly determines the accuracy of the measurement benchmark.
Firstly, it is necessary to correctly set the material combination based on the material properties of the tested coating and substrate. Each material has different absorption and reflection characteristics for radiation, for example, measuring gold coating on a nickel substrate and measuring chromium coating on an iron substrate require completely different parameters. The standard curve or model built into the instrument is based on specific material pairing, and selecting the wrong one will lead to systematic deviation.
Secondly, the selection of measurement mode should be based on practical application scenarios. For point like or small area coatings, a single point measurement mode should be used for precise positioning; If it is necessary to evaluate the uniformity of the coating of the entire product, the scanning measurement mode or multi-point automatic measurement mode is more efficient and can quickly obtain the thickness distribution map.
Furthermore, calibration procedures are of paramount importance in parameter settings. Before use, it is necessary to calibrate with a standard plate of the same or known thickness as the substrate and coating material of the test sample. The calibration process should cover the expected thickness range, typically including zero position calibration and at least one point (or multiple points) range calibration. For high-precision requirements, it is recommended to perform rapid calibration before daily work and conduct comprehensive calibration verification regularly.
In addition, measurement conditions such as X-ray tube voltage/current (for XRF method), probe pressure (for mechanical method), measurement time, etc. also need to be optimized. Higher voltage or longer measurement time can usually improve the signal-to-noise ratio, which is suitable for micro coatings, but the measurement efficiency needs to be balanced.
2、 Flexible method adjustment: responding to complex practical working conditions
Even if the parameter settings are correct, it is still necessary to flexibly adjust the measurement method in the face of ever-changing actual samples.
When the shape of the sample to be tested is irregular (such as curved surfaces, threaded parts), the measurement results calibrated by the standard plane will produce errors. At this time, a small diameter probe or specialized fixture should be selected, and if necessary, a curvature calibration plate that is consistent with the shape of the workpiece should be used for calibration to compensate for the influence of geometric shape.
For the measurement of multi-layer coatings (such as Cu/Ni/Cr), it is necessary to use the multi-layer film analysis software of the instrument and correctly set the measurement sequence and element (or material) type of each layer. The thickness and composition of each layer will affect each other, so advanced algorithms must be relied upon for spectral calculation.
When encountering samples with rough substrate or poor surface finish, scattering will increase and interfere with the measurement signal. The solutions include: appropriately increasing the measurement points to obtain the average value, polishing the substrate (if allowed), or using eddy current methods that are insensitive to surface conditions (applicable to non-conductive coatings on non-ferrous metal substrates) for cross validation.
For extremely thin (<0.1 μ m) or thick coatings, it may exceed the linear range of the instrument. At this point, the measurement program optimized for this thickness range should be selected, or the effective range should be expanded by changing the measurement conditions (such as reducing the X-ray power to measure thick films).