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배대석;권오봉
- Journal of Advanced Marine Engineering and Technology
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- v.25 no.4
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- pp.898-903
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- 2001
The particle image velocimetry with liquid crystal tracers is used for visualizing and analysis of the bubbly flow in a vertical temperature gradient. This method allows simultaneous measurement of velocity and temperature field at a given instant of time Quantitative data of velocity were obtained by applying the MQD technique to visualized image. The paper describes the method, and presents the transient velocity patterns of bubbly flow.
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Leem, Y.A.;Kwon, O.K.;Kim, K.
- Electronics and Telecommunications Trends
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- v.33 no.6
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- pp.41-49
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- 2018
Mid-infrared optical sensors have a number of compelling advantages for remote sensing and the simultaneous measurement of mixtures. However, they still have difficulties in accurate detection owing to signal interferences among a large number of molecular fingerprints in the mid-infrared band, which result in very slow commercialization. Higher sensitivity and higher selectivity are required to overcome this obstruction in measurement technology. In this paper, we review and analyze the trends of mid-infrared sensor technologies enhancing the sensitivity and selectivity.
https://doi.org/10.22648/ETRI.2018.J.330605 인용 PDF HTML

Choi, Jong Geun;Kim, Seongeun
- Journal of the Korean Society of Manufacturing Technology Engineers
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- v.23 no.6
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- pp.642-646
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- 2014
This research describes the measurement of roll parallelism by a laser interferometer. Parallelism among rolls is an important factor for improving the precision of printing devices. A laser interferometer, which is a device for the precise measurement of distance, can be utilized to measure parallelisms between rolls. To measure distance between two rolls by using a laser interferometer, the laser must not be severed during measurement. To achieve this condition, a linear motion guide was installed to each roll being measured, and continuous measurement of distance between two rolls was implemented by the simultaneous control of two mirrors installed on the guides. The method to measure parallelism between two rolls presented in this research can be utilized to improve printing precision by enhancing parallelism between rolls in printing devices.
https://doi.org/10.7735/ksmte.2014.23.6.642 인용 PDF KSCI

Choi, Kwang-Jae;Kim, Young-Han;Chang, Sang-Mok
- Journal of Sensor Science and Technology
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- v.8 no.4
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- pp.314-319
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- 1999
The measurement of solid particles suspended in air is conducted with a quartz crystal microbalance. The measurement system is connected to a personal computer and multiple sensors are utilized to make simultaneous measurement possible. In this paper, the detail of experimental setup is extensively explained for the possible future application of the system in other areas. It is found that the measurement system is suitable for an on-line continuous determination of the concentration of solid particles in air.
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