Moire Institute Inc.

Izumisano, Japan

Moire Institute Inc.

Izumisano, Japan
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Koganeya K.,Shima Seiki Manufacturing Ltd. | Fujigaki M.,Wakayama University | Morimoto Y.,Moire Institute Inc.
Sen'i Gakkaishi | Year: 2011

It is well known that the faults such as thin-thick, neps and unevenness in the staple yarn make bad the quality of the fabric that is knitted from the yarn. There is a double ply yarn that have neither thin-thick nor neps and no specific cycle in yarn evenness that cause problem in the plain stitch fabric made from flat knitting machine. For comparison, the yarn which has almost same properties on evenness test as the former yarn and makes no problem fabric is selected. In the case of former yarn, the range of the tension which passes through needles on friction test is wider than that of latter yarn and the tension has a certain cyclic variation. The yarn which has certain cyclic tension variation at passing through the needles is made experimentally and is knitted. These results were shown.


Morimoto Y.,Moire Institute Inc. | Fujigaki M.,Wakayama University | Masaya A.,Wakayama University | Shimo K.,Wakayama University | And 2 more authors.
SAE International Journal of Materials and Manufacturing | Year: 2011

Recently, sampling moire method was developed to analyze the phase of a one-dimensional or two-dimensional grating on an object with high accuracy. In the method, several phase-shifted moire patterns are generated from one image of the grating. In order to analyze a shape by a stereoscopic method, it is necessary to find the corresponding points between the two images of the object recorded from different two cameras. It is possible to analyze the phase of the grating using the sampling moiré method and find the corresponding points as points with the same phase. It is also possible to analyze the displacement and strain from the corresponding point before and after deformation. This method is, therefore, suitable for shape and strain distribution measurement of a moving object. In this paper, a dynamic shape and strain measurement method using the sampling moiré method is proposed and a system for the measurement is developed. The principle of the method, the measurement system, and the experimental results applied to a rotating tire running at the speed of 80 km/h are shown. © 2011 SAE International.


Fujigaki M.,Wakayama University | Nishitani R.,Wakayama University | Morimoto Y.,Moire Institute Inc.
EPJ Web of Conferences | Year: 2010

Phase-shifting digital holography is a convenient method to measure displacement and strain distributions. Development of compact and conventional strain distribution measurement equipment for practical use is required for inspection of health monitoring and life lengthening of infrastructures such as steel bridges. In this paper, we propose an off-axis reconstruction method for displacement and strain distribution measurement with a phase-shifting digital holography. In the case of off-axis optical setup, the pitch of the fringe appearing on the image sensor becomes smaller than a pixel size. However, the phase-shifting digital hologram can be obtained even if the off-axis setup and effective results can be obtained using a Windowed-PSDHI. The principle and the experimental result of strain distribution measurement was performed with this method using two cameras. © 2010 Owned by the authors, published by EDP Sciences.


Masaya A.,Wakayama University | Fujigaki M.,Wakayama University | Morimoto Y.,Moire Institute Inc.
AIP Conference Proceedings | Year: 2010

In this study, a system using a Field Programmable Gate Array (FPGA) memory board is proposed to obtain the full-size shape without any reduction of the image in real-time. The memory of the FPGA memory board has a phase analysis table and phase-coordinate tables. The brightness data of the recorded grating are stored in the phase analysis table to obtain the phase of the recorded grating. The calibration data using a moving reference plane are stored as a phase-coordinate table to obtain the coordinates of the phase. An experiment to evaluate this system was performed. The analysis speed of shape measurement using the memory board did not depend on a speed of a personal computer. The accuracy of shape measurement using the memory board and using software was almost the same. The analysis speed using the memory board was faster than the one using software. © 2010 American institute of Physics.


Morimoto Y.,Moire Institute Inc. | Fujigaki M.,Wakayama University | Masaya A.,Wakayama University
Journal of the Vacuum Society of Japan | Year: 2011

Moire method is a useful method to measure deformation and strain distribution of structures. Moire fringe patterns are analyzed quantitatively and speedy by image processing using a computer. In this paper, the theory of moire method and sampling moire method is introduced. Since the sampling moire method is useful to analyze phases of a moire fringe and a grating from one image of a grating pattern, it is possible to analyze dynamic deformation accurately. Some applications of the sampling moire method to displacement measurement of a beam, and shape and strain measurement of a rubber structure are shown.


Shimo K.,Wakayama University | Fujigaki M.,Wakayama University | Masaya A.,Wakayama University | Morimoto Y.,Moire Institute Inc.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

Shape measurement and strain distribution measurement are important to analyze the behavior of a moving object. In this paper, a dynamic shape and strain measurement system by the sampling moire method is developed. Recently, phase analysis method using phase-shifting moire patterns generated in a computer from a grating image is proposed. This method is very suitable for dynamic measurement because the phase can be obtained from a one-dimensional or two-dimensional (2-D) grating image with high accuracy. It is possible to analyze strain distribution and shape measurement of a moving object using a grating pattern attached on the specimen surface. A dynamic shape and strain measurement system by the sampling moire method is developed. The principle and experimental results applied to a rotating object are shown. © 2010 SPIE.


Koganeya K.,Shima Seiki Manufacturing Ltd. | Fujigaki M.,Wakayama University | Morimoto Y.,Moire Institute Inc.
Sen'i Gakkaishi | Year: 2010

It is well known that the results of yarn evenness test informed the quality of the resulting fabric. The unevenness such as thin, thick, nep, and mass periodic change caused bad visual quality of fabric. Evener yarn makes better visual quality fabric. In our previous paper, it was, however, reported that the double ply yarn having little unevenness caused a peculiar manner of bad visual quality of the plain stitch fabric. But, in yarn friction test, this yarn had the wider range of the friction change working between needles and the running yarn than usual yarns. In addition, the friction change had a certain cyclic variation. In case of flat knitting machine, dyeing double ply yarns are generally knitted. After dyeing, evenness test and friction test are seldom applied to the yarn. In this paper, these tests were carried out for the several yarns which were generally knitted by flat knitting machine. Some yarns were added as tested yarns. Those yarns imitated the yam that caused a peculiar manner of bad visual quality. The result of these examination and measurement was weighed. It was found that there was the correlation between the variety of friction and visual quality of the resulting fabric.


Masaya A.,Wakayama University | Fujigaki M.,Wakayama University | Matsumoto S.,Wakayama University | Morimoto Y.,Moire Institute Inc.
Optics and Lasers in Engineering | Year: 2012

Whole-space tabulation method (WSTM) is a technique to relate the phase of a projected grating and the coordinates at each pixel of a camera. The relation data of all the pixels are obtained in the whole-space where a reference plane is moved. The relation data are stored in tables. Thereby, WSTM is high speed and accurate shape measurement method because the coordinates are obtained by only looking up the tables without any complex calculation. Even when the brightness distribution of the projected grating is warped from a cosinusoidal wave, correct coordinates are provided. However, the WSTM needs huge memories for the phase-coordinate tables such as 10 GB in the case of a VGA image and 2000 tables at each pixel. Therefore, we developed an FPGA memory board to store the table and to refer the table in real-time. In the case of a ball grid array (BGA), it is necessary to measure the shape of the balls with high accuracy and high speed without the influence of halation. It is also necessary to measure the coplanarity of the balls without distortion. The influence of halation can be reduced with combining the 3D shape measured with several cameras set at different positions. It is easy to realize them using the WSTM. In this paper, it is confirmed that accurate shape measurements for a BGA can be performed using the WSTM with an FPGA memory board. © 2011 Elsevier Ltd. All rights reserved.


Oura Y.,Wakayama University | Fujigaki M.,Wakayama University | Masaya A.,Wakayama University | Morimoto Y.,Moire Institute Inc.
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2011

Equipments for 3D shape measurement with compact and low-cost are required in wide industrial fields. We proposed Shape Measurement by a light source stepping method to realize the requirement. The method is one of the grating projection methods. In this method, multiple point light sources and a ronchi grating are used as a grating projector. Phase-shifting is performed with switching the light source position. By using this method, the shape measurement equipments can be produced with low-cost and compact because of no phase-shifting mechanisms. Also, the measurement speed is very fast because it is possible to switch the LED light sources in very short time. The grating can be projected without defocusing any place because of any focusing lenses in this projector. In this method, it is necessary that the emitting width on the point light source is narrow than the pitch of the ronchi grating. Brightness is also necessary for measuring the shape with accurate. Therefore, in this study, we develop a linear LED device for shape measurement by the light source stepping method. The effectiveness of the device is evaluated with an experimental test of shape measurement.


Nakabo M.,Wakayama University | Fujigaki M.,Wakayama University | Morimoto Y.,Moire Institute Inc. | Sasatani Y.,Wakayama University | And 2 more authors.
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2011

The ability to measure the small displacement caused by a landslide is important. If it were possible to measure the displacement before the landslide occurs, people would be able to evacuate before the landslide occurs and reach a safe area. Therefore, we developed a detection system using the small displacement measurement of a landslide. This system uses a displacement measurement technique known as the sampling moire method. This method is capable of analyzing the phase values from one image of a grating pattern. Because of this, the detection system is very simple and compact. In addition, it analyzes displacement very accurately. The phase is calculated from several phase-shifted method fringe patterns that are obtained by changing the sampling phase. The displacement is analyzed by determining the difference in the phase before and after displacement. However, the displacement results contain errors such as stir and air turbulence, which complicate landslide prediction. The level of error can be decreased by taking the averages of displacement that contain errors. Therefore, we developed a sampling moire camera that is capable of rapidly, acquiring images and performing a high-speed analysis. The sampling moire camera uses sampling moire method to analyzing the phase. In this paper, we describe the sampling moire camera's ability to predict landslides by measuring small displacement. We also conduct experiments that test the system.

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