Sensors

Maintaining etch uniformity from the center to the edge of the wafer during the etching process is a critical challenge. In particular, the edge of the wafer poses difficulties due to changes in the angle of ion incidence caused by the curvature of the sheath, making it challenging to achieve the desired etch pattern. Therefore, identifying and monitoring key factors that significantly impact center-to-edge uniformity is essential.

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The SiO2 etching process using CF4/O2 plasma is a critical step in semiconductor manufacturing, where process efficiency and precise control are essential. In this study, optical emission spectroscopy (OES) data was utilized in real-time to analyze the correlation between plasma conditions and the etch rate (ER) during the process. Specifically, the source and bias power were divided into four different conditions to systematically evaluate the changes in plasma characteristics and the etching process. Based on this evaluation, a physical model was developed to predict the etch rate.

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As semiconductor devices have become increasingly miniaturized, the ability to control very small Critical Dimensions (CDs) during the etching process has become crucial through controlled plasma processes. Consequently, diagnosing plasma and reflecting this in the process to enhance yield is of paramount importance. Typically, an invasive sensor like a Single Langmuir Probe (SLP) is utilized for plasma diagnostics. However, using this sensor can affect the plasma, necessitating the use of non-invasive diagnostic methods.

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The accurate distinction between line-of-sight (LOS) and non-line-of-sight (NLOS) propagation channels is paramount for precise distance measurement within ultra-wideband (UWB) indoor localization systems. In complex and dynamic environments, such as those encountered in the indoor positioning of autonomous mobile robots or vehicles, UWB signal propagation is particularly susceptible to NLOS conditions.

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RLED contains 80,400 images and corresponding events, we utilized a photometer to continuously measure scene illumination and calculate the illumination value after attenuation at the event camera. The capture scenes included city (35.0%), suburbs (10.3%), town (14.5%), village (17.8%), and valley (22.4%). Half of the RLED frames are captured at a frame rate of 25 fps, and the other half at 10 fps. The exposure time is set to 1ms, 3ms, and 5ms based on the varying environmental illumination.

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Ground Penetrating Radar (GPR) facilitates the detection and localisation of subsurface structural anomalies in critical transport infrastructure (e.g. tunnels), better informing targeted maintenance strategies. However, conventional fixed-directional systems suffer from limited coverage - especially of less-accessible structural aspects (e.g. crowns) - alongside unclear visual output of anomaly spatial profiles, both for physical and simulated datasets.

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I would introduce the data we uploaded as follows: These data are the experimental fringe images taken by the experimental platform we built. These phase-shifting fringe images are divided into the fringe images required for calibration and the fringe images for measuring the target to be measured. The required images for calibration are the fringe images taken at different heights (different heights are: 15mm, 25mm, 30mm and 40mm).

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We present a comprehensive multi-sensor dataset comprising 4D mmWave radar point clouds, lidar point clouds, and camera images in the open-pit mine. The dataset encompasses various operational scenarios, including the dumping site, loading site, connecting roads, and haulage maintenance area, under various lighting conditions such as cloudy, dark, daylight, and overcast skies.

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These are the 16-step phase-shift fringe images and five gray code fringe images that we collected and applied to the experiment. To facilitate the comparison experiments, we also supplement the average intensity images.
In order to better compare the experimental results, we collected the images of no target, horizontal discontinuous target and continuous target respectively, so that the results can better reflect all kinds of situations, so as to make the results more extensive and illustrative.

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