It is necessary to adjust the focus using conversion lenses to validate the performance of a stereo camera using a display. Although the conversion lens causes distortion, previous studies have shown that correcting for this distortion enables correct performance evaluation. In this study, we applied this method to a wide-angle stereo camera, for which the distortion effect is expected to be more pronounced, and conducted a verification.

In this study, we propose a method for detecting changes on the outer surface of pipes using inspection videos captured by a patrol inspection robot. In patrol inspections, it is important to detect changes on the outer surface of pipes by comparing them with their past normal state. Therefore, comparing the videos before and after the changes is crucial for change detection. In the proposed method, we extracted comparison image pairs using image features from videos captured by a camera on a mobile robot and performed change detection using deep learning. This method achieved a detection accuracy of 93.9% for changes in the inspection videos.

Dielectrics are widely used in nanoscale circuits in electrical and electronic industries. The nanoscale dynamics of dielectrics is fundamental to understanding nanoscale systems and devices. We have developed a long-wave infrared spectroscopic system with our passive scattering-type scanning near-field optical microscope (s-SNOM), which can directly detect evanescent waves without any external light sources. The near-field signal results obtained by s-SNOM can reflect the EM-LDOS of the material. The intensity of the near-field signal will decrease as the distance from surface increases. The resulting near-field attenuation curve can obtain the localized characteristic information of the electromagnetic wave localized on the sample surface. In this study, we aim to perform spectroscopic on AlN around 12 μm because it is close to the surface phonon resonance wavelength of AlN. In the presentation, we have a discussion with the spectroscopic singals.

In recent years, we have developed a home-made passive Scanning Near-field Optical Microscope (SNOM) utilized to probe spontaneous emission from metals and dielectric materials. The evanescent waves generated on the sample surface are scattered by sharp tungsten tips made by electro-chemical etching. Previous study visualized that the spatial resolution of the passive SNOM have a strong relationship with the tip size. This research aims to stably fabricate tips within 20 nm by analysing the influence factors including solution concentration, voltage and cut off current in electro-chemical etching. By utilizing appropriate parameters in fabricating, it is expected to obtain sharp tips with good shape so that we can improve the spatial resolution of passive SNOM.

Lensless imaging with Fresnel zone aperture is expected to be applied as a distance sensor because the distance information to the object is included in the acquired data. Therefore, there is need to improve the accuracy of object distance measurement. However, previous studies have experimentally confirmed a decrease in measurement accuracy with an increase in the object distance. In this paper we simulate the effect of object distance on measurement accuracy and report the validity of the experimental results.

The beam size of the laser scanner is one of the factors to be considered in measurement planning. However, the catalog specifications usually provide only the spot diameter at a specific distance. Therefore, it is necessary to be able to estimate the spot diameter at arbitrary measurement distances. To provide the spot diameter at arbitrary distances, we have measured the spot size using a target with a circular hole. This target consists of two flat surfaces with a circular hole in the front surface. By scanning this target, the spot diameter is estimated based on the number of ghosts which appear at the hole edge. In this study, we investigated how the number of ghosts change according to the distance between these two surfaces. As a result, we found that the number of ghosts was maximum and most stable at the gap of 41mm. This indicates that there exists an optimal surface gap for each scanner.

The data stitching software is a software used to smoothly connect 2D data such as mirror measurement data obtained by interferometers. In conventional data connection methods, the handling of drift errors was insufficient, resulting in discontinuities in the connected data. We have developed a method that models drift errors as elastic bodies and solves them as a minimization problem of elastic energy. In this presentation, we will report on the design of the software and the results of the connection experiments.

This study proposes a measurement method for the interior of large structures for infrastructure maintenance and inspection. The 3D point cloud of a room is obtained by a light section method using sphere camera that can capture a 360-degree view of the surrounding area and a 360-degree ring laser. Specifically, the camera's orientation is determined by detecting line components in real space using the spherical camera images and comparing the distribution of these line components with the three directions in real space, based on the Manhattan world assumption. Using the camera's orientation, the 3D point cloud of the entire room is generated by integrating the point clouds obtained from multiple light sections.

In recent years, TEM (transmission electron microscope) has been used to measure the size distribution of nanoparticles in nanotechnology research and development. However, for nanoparticles with a diameter of 10 nm or less, the contrast of the TEM signal is low, and the measurement results change when the measurement parameters are changed. In this study, we propose a method to analyze the TEM measurement results. Determine the best variable based on the values of multiple measured variables. In this method, the evaluation amount is calculated by weighting the frequency of each particle size in each measurement result. Then, the results are classified based on the evaluation amount, evaluation criteria that are even functions are obtained, and optimum measurement conditions are determined. This method enables highly accurate measurements and greatly reduces the measurement time compared to measurements using open software called ImageJ, which conventionally required manual work

It is known that degradation of edible oils can cause food poisoning, and periodic replacement is required by sanitary codes. Although AV-CHECK papers are used for measurement, they are not efficient because of the temperature and time requirements for confirmation. Therefore, we developed a device to measure degradation based on RGB light attenuation even during cooking, and aimed to clarify the timing of oil replacement. In this study, we report on the development of the degradation diagnostic device and the validity of the device by measuring oil of different colors.

Optical components that are expected to be used under adverse environmental conditions must be protected from loss due to degradation, and it is desirable to calculate the life of the product in advance. Optical modules are generally assembled by gluing, soldering, or welding. We assembled modules using a YAG laser and evaluated the weld fixtures based on screening experiments using temperature cycles. We report the results that the number of welding cycles and positional deviations affect the loss variation.

Material extrusion (MEX), one of additive manufacturing processes, has a simple mechanism adaptable to various 3D printer systems. However, MEX still has various challenges in its fabrication accuracy and efficiency for producing parts for various purposes in industries. This study is developing a high-gravitational 3D printer by combining a MEX unit and a centrifuge. In MEX, gravitational acceleration strongly influences on the amount of material extruded from the nozzle outlet in a unit time. Furthermore, the thickness of one layer gets smaller in high gravity, resulting that the fabrication resolution gets higher. As a result, the high-gravitational MEX (HG-MEX) has a high potential to innovate the 3D printing system by enhancing the fabrication accuracy and efficiency at the same time. To evaluate the effect of high gravity on performances of MEX quantitatively, this study analyzes the fluid dynamics of material supplying process in HG-MEX based on numerical simulations. The simulation results show that the material supplying efficiency drastically enhances and the thickness of extruded material gets smaller in higher gravity up to 32G, which is in the same tendency with the experimental results.