In the fields of precision manufacturing and materials science, measuring the thickness of thin films on non-planar and non-smooth surfaces has always been a technical challenge. The traditional contact measurement method is prone to damaging the sample, while the common optical method is easily affected by surface scattering or curvature, resulting in distorted results. In response to this industry pain point, the Filmetrics F20 optical film thickness gauge, with its flexible hardware configuration and powerful algorithms, offers a set of effective measurement adaptation solutions. As the general agent of this product in China, Unicon Technology Co., LTD. (Yiying Technology) based on a large number of practical application cases, this article will deeply analyze how the Filmetrics F20 optical film thickness gauge responds to the measurement requirements of curved surfaces, roughness and small areas. By choosing the appropriate accessories and measurement modes,Filmetrics F20 Optical film thickness gaugeIt can expand the application scope of high-precision measurement from ideal planes to more complex real workpiece surfaces.
For curved or rough surfaces, physical contact often leads to probe wear or sample scratches. The Filmetrics F20 optical film thickness gauge adopts the principle of light reflection measurement and does not require contact with the sample throughout the process. The working principle is as follows: Incident light penetrates the film layer, undergoes reflection at different interfaces and generates an interference spectrum. The thickness is calculated by analyzing the spectral oscillation frequency. This non-contact characteristic makes it highly suitable for measuring soft coatings (such as silicone rubber), fragile films or surfaces with microstructures. Meanwhile, the Filmetrics F20 optical film thickness gauge can effectively measure solid, liquid and even gaseous films, which provides a flexible solution for addressing the thickness issues of complex interfaces, such as liquid photoresist or oil films on curved surfaces.
One difficulty in surface measurement lies in that overly large light spots can cross the curvature variation area, causing signal averaging and failing to reflect the true thickness. The Filmetrics F20 optical film thickness gauge can significantly reduce the standard 1.5mm spot size through an optional optical path system - with a minimum configurable size of 20 microns. A small light spot means that specific points on a curved surface (such as the vertex or edge of a lens) can be precisely located, or relatively flat micro-areas on a rough surface can be measured. In practical applications, for the coating of mobile phone camera lenses, the hardening anti-fog layer of car lamps, and the drug coating on the surface of precision medical devices, the small spot accessory of the Filmetrics F20 optical film thickness gauge can all obtain stable and repeatable thickness data.
Rough surfaces can cause diffuse reflection of light, increasing the difficulty of signal acquisition and analysis. The Filmetrics F20 optical film thickness gauge addresses this challenge with its wide spectral coverage capability (wavelength range 380-1050nm, optional wider) and advanced FILMeasure analysis software. A wide wavelength range provides richer spectral information, which helps the software accurately extract interference fringes from noisy signals. The software's built-in database of thousands of materials and various analysis models (such as spectrum matching techniques for weak signals) can effectively analyze the reflection spectra from rough interfaces (such as conformal coating on PCBS and thick-film resistors on ceramic substrates). By optimizing measurement parameters and selecting appropriate analysis models, the Filmetrics F20 optical film thickness gauge can meet strict quality control requirements in terms of measurement accuracy and repeatability on rough surfaces.
To further enhance its adaptability to complex samples, the Filmetrics F20 optical film thickness gauge can integrate a variety of hardware accessories to build a complete solution. For instance, when paired with the XY10 automatic sample stage, it can achieve multi-point and programmed automatic measurement of curved surface workpieces or large-area rough samples, and generate thickness distribution maps. By using the microscope connection accessory (MA-CMOUNT-F20KT), the operator can observe in real time and precisely locate the tiny target areas on the sample surface (such as specific particles on a rough surface or the film layer around defects). In addition, in conjunction with the transmittance measurement accessory (SS-Trans curved), the Filmetrics F20 optical film thickness gauge can also be used to measure the transmittance of free-form surface optical components and the related film layer performance.
Summary: In conclusion, the Filmetrics F20 optical film thickness gauge is not a universal instrument suitable only for smooth planes. Through a combined solution of "non-contact principle + small spot accessory + advanced algorithm + hardware expansion", it can effectively address the challenges of film thickness measurement on curved surfaces, rough surfaces, and tiny areas. As a professional service provider, Unicon Technology Co., LTD. (Yiying Technology) not only offers the core equipment Filmetrics F20 optical film thickness gauge, but also provides free sample testing and verification services based on the specific samples of users, and assists in designing customized measurement solutions to ensure the acquisition of true and reliable thickness data in complex measurement scenarios.
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