Development of a high-speed nanoprofiler using normal vector tracing method for high-accuracy mirrors

2013 ◽  
Author(s):  
Kohei Okuda ◽  
Takao Kitayama ◽  
Koji Usuki ◽  
Takuya Kojima ◽  
Kenya Okita ◽  
...  
Keyword(s):  
High Speed ◽  
High Accuracy ◽  
Normal Vector ◽  
Tracing Method

Effects of a laser beam profile to measure an aspheric mirror on a high-speed nanoprofiler using normal vector tracing method

2012 ◽  
Vol 12 ◽  
pp. S47-S51 ◽  
Author(s):  
H. Matsumura ◽  
D. Tonaru ◽  
T. Kitayama ◽  
K. Usuki ◽  
T. Kojima ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Speed ◽  
Beam Profile ◽  
Normal Vector ◽  
Laser Beam Profile ◽  
Aspheric Mirror ◽  
Tracing Method

High-accuracy three-dimensional aspheric mirror measurement with nanoprofiler based on normal vector tracing method

2017 ◽  
Vol 98 ◽  
pp. 159-162 ◽  
Author(s):  
Ryota Kudo ◽  
Takao Kitayama ◽  
Yusuke Tokuta ◽  
Hiroki Shiraji ◽  
Motohiro Nakano ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Accuracy ◽  
Normal Vector ◽  
Aspheric Mirror ◽  
Tracing Method

scholarly journals Multi-Touch Interaction Generation Device by Spatiotemporally Switching Electrodes

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1475
Author(s):  
Masahiro Okamoto ◽  
Kazuya Murao
Keyword(s):  
High Speed ◽  
High Accuracy ◽  
Conductive Ink ◽  
Control Board ◽  
Touch Panel ◽  
Electrode Size ◽  
Touch Input ◽  
Touch Interaction ◽  
Multiple Electrodes ◽  
Touch Panels

With the spread of devices equipped with touch panels, such as smartphones, tablets, and laptops, the opportunity for users to perform touch interaction has increased. In this paper, we constructed a device that generates multi-touch interactions to realize high-speed, continuous, or hands-free touch input on a touch panel. The proposed device consists of an electrode sheet printed with multiple electrodes using conductive ink and a voltage control board, and generates eight multi-touch interactions: tap, double-tap, long-press, press-and-tap, swipe, pinch-in, pinch-out, and rotation, by changing the capacitance of the touch panel in time and space. In preliminary experiments, we investigated the appropriate electrode size and spacing for generating multi-touch interactions, and then implemented the device. From the evaluation experiments, it was confirmed that the proposed device can generate multi-touch interactions with high accuracy. As a result, tap, press-and-tap, swipe, pinch-in, pinch-out, and rotation can be generated with a success rate of 100%. It was confirmed that all the multi-touch interactions evaluated by the proposed device could be generated with high accuracy and acceptable speed.

scholarly journals A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4348 ◽  
Author(s):  
Wei Liu ◽  
Xin Ma ◽  
Xiao Li ◽  
Yi Pan ◽  
Fuji Wang ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Measurement Accuracy ◽  
Performance Testing ◽  
Angle Measurement ◽  
Normal Vector ◽  
Calibration Model ◽  
Linear Calibration ◽  
Observation Window ◽  
Vision Measurement

Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed airflow influence, which will lead to a big measurement error. In this paper, to further improve the vision-based pose measurement accuracy, an imaging model which considers the refraction light of the observation window was proposed. In this method, a nonlinear camera calibration model considering the refraction brought by the wind tunnel observation window, was established first. What’s more, a new method for the linear calibration of the normal vector of the glass observation window was presented. Then, combining with the proposed matching method based on coplanarity constraint, the six pose parameters of the falling target could be calculated. Finally, the experimental setup was established to conduct the pose measurement study in the laboratory, and the results satisfied the application requirements. Besides, experiments for verifying the vision measurement accuracy were also performed, and the results indicated that the displacement and angle measurement accuracy approximately increased by 57% and 33.6%, respectively, which showed the high accuracy of the proposed method.

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