Atometrics white light interferometer has been stationed in many scientific research institutions to help publish cutting-edge researchs

In recent years, with the improvement of measurement accuracy, measurement stability and measurement efficiency of domestic white light interferometers, more and more universities and scientific research institutions have introduced relevant equipment to promote the exploration and research of scientific research results in related fields. For example, institutions such as the Chinese Academy of Sciences, Peking University, Harbin Institute of Technology, Southwest Jiaotong University, and Hunan University have configured white light interferometers of the Atometrics brand in relevant laboratories.

In the relevant papers published in 2023-2024, white light interferometers are applied to cutting-edge research fields such as micropore measurement, microlenses, ultra-fine 3D printing, coating preparation, plant micromorphology, film preparation, and processing of hole wall surface roughness.

Next, let Dr. Atometrics introduce to you what core results these scientific research papers that use Atometrics white light interferometers have published.

1. Surface quality and burr characterization during drilling CFRP/AI stacks with acoustic emission monitoring

Journals: Journal of Manufacturing Processes

IF：6.1

Hunan University State Key Laboratory of Advanced Vehicle Body Design and Manufacturing

First author: Zhang Xiaodong

This paper mainly introduces the use of acoustic emission (AE) technology to monitor the drilling process of carbon fiber reinforced composites (CFRP) and aluminum alloy (Al) laminates. By analyzing the AE signal, material removal behavior and processing defects can be identified. These include the identification of the drilling stage, the frequency characteristics of CFRP damage mode, the correlation between surface quality and AE signals, and the formation mechanism of burrs at the hole exit.

By extracting the time domain characteristics of the AE signal, the initial fracture and formation mechanism of the burr at the hole exit are further understood, providing a theoretical basis for optimizing the processing technology.

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In this study, the author team used the Atometrics white light interferometer (AM-7000 series, model NA500) to evaluate the hole surface morphology and measure the surface roughness.

The results show that AE technology has practical application value in the online monitoring of drilled CFRP/Al stacks, and can provide a reference for real-time monitoring of processing quality and dynamic information collection.

     2. Closure Effect of Ⅰ+Ⅱ Mixed-mode Crack for EA4T Axle Steel

Journals: Chinese Journal of Mechanical Engineering

IF：4.6

State Key Laboratory of Rail Transit Vehicle Systems, Southwest Jiaotong University;

Institute of Metal Forming, RWTH Aachen University

First author: Shuancheng Wang

Fatigue damage and fracture are inevitable phenomena in the service life of engineering structures and materials. When fatigue damage accumulates to a certain extent, local plastic deformation will occur in high stress areas, and this deformation is an important reason for the crack closure effect. Crack closure effects include plasticity-induced closure (PICC), roughness-induced closure (RICC), and oxidation-induced closure (OICC). In actual engineering, cracks may exist in mixed modes (I + II), and studying the crack closure effect is crucial to understanding crack propagation behavior and evaluating structural life.

In this paper, the research team conducted mixed mode (I + II) fatigue crack growth tests on EA4T axle steel. The test was carried out using an electronic tension-torsion tester (INSTRON E10BMT), setting different loading angles (30°, 45°, 60°) and loading parameters (maximum load 4 kN, R = 0.1, frequency 25 Hz). The crack propagation trajectory was recorded using the replica method, and the crack propagation path was observed in real time using DIC technology (Revealer 2D-DIC) and an industrial microscope.

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In this study, the team used a Atometrics white light interferometer (AM-7000 series, model ER230) to measure the surface roughness (RA value) on both sides of the crack to analyze the crack closure effect.

The team finally found that under mixed mode loading, the PICC and RICC effects interact during crack propagation, affecting the crack propagation rate and direction. Crack deflection is an intuitive manifestation of the interaction between the PICC and RICC effects. After deflection, the crack propagation direction gradually becomes perpendicular to the loading axis. The change in the roughness of the crack surface has a significant effect on the RICC effect. The increase in roughness during crack propagation leads to an enhanced RICC effect.

Through numerical simulation and experimental verification, the research results provide a new perspective for understanding the crack propagation behavior under mixed mode and provide theoretical support for fatigue life assessment of engineering structures.

       3. MIcrostructure and high-temperature tribological properies of Ti/Si co-doped diamond-like carbon films fabricated by twin-targets reactive HiPIMS

Journals: Diamond & Related Materials

IF: 4.3

Harbin Institute of Technology Advanced Welding and Joining State Key Laboratory;

CATL 21C Innovation Laboratory

First author: Yuanshu Zou

Diamond-like carbon (DLC) films are widely used in aerospace, cutting tools, hydraulic systems, and high-speed gas bearings due to their high hardness, excellent lubricity, and wear resistance. However, the operating temperature of DLC films is usually limited to below 300°C. Above this temperature, graphitization will occur, resulting in lubrication failure.

In order to improve the high-temperature performance of DLC films, researchers have tried to adjust their structure and properties by doping metal and non-metal elements. In this study, Ti/Si co-doped DLC films were prepared by dual-target reactive high-power pulsed magnetron sputtering (HiPIMS) technology, and their microstructure and high-temperature tribological properties were studied.

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In this study, the team used a Atometrics white light interferometer (AM-7000 series, model NA500) to measure the thickness of the deposited film, and achieved thickness measurement by making steps on the silicon wafer substrate.

The results of the paper show that at 450°C, the friction coefficient of the Ti/Si co-doped DLC film can be as low as 0.08, and the wear rate is significantly reduced. Compared with the single Ti-doped DLC film, its wear rate at 450°C dropped from 5.24×10⁻⁴ mm³·N⁻¹·m⁻¹ to 1.40×10⁻⁵ mm³·N⁻¹·m⁻¹. The addition of Si effectively inhibits the graphitization process at high temperature and reduces adhesive wear, thereby significantly improving the high-temperature wear resistance of the film.

Since the brand was founded, Atometrics has always adhered to the concept of "Inspect for excellence" and is willing to assist students and teachers in universities, research institutes and laboratories in academic research, help the development of various disciplines and technology and industry innovation, and promote the vigorous development of scientific research.

If your experiment/research topic requires high-precision detection and verification of surface roughness/3D topography/film thickness/step/surface PV/blind hole/curvature radius, etc., you are welcome to contact Atometrics at any time!