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PTC 서미스터를 이용한 유속계의 성능향상에 관한 연구
윤준용,조남규,김진래,성낙원,김광진,Yoon, Joon-Yong,Cho, Nahm-Gyoo,Kim, Jin-Rae,Sung, Nak-Won,Kim, Hwang-Jin 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.4
An anemometer employing the bulk PTC thermistor as the sensing element is investigated in this study. The numerical and experimental works are carried out to improve the sensitivity problem of the element by focusing fluid dynamics point of view. The typical shape of the sensing element has been used as a rectangular type, but this shape has a sensitivity problem because of flow separations on the sharp edge when the flow direction is different from that of the sensing element. In order to reduce the reading error, the installer has to be very careful about the flow direction. The reading error fluctuation by time as well as the sensitivity problem can be improved considerably through this study. It can be concluded that the small change of the sensor shape can improve the performance of the flow sensor.
권기환,문홍기,조남규,Kwon, Ki-Hwan,Moon, Hong-Kie,Cho, Nahm-Gyoo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
A precision displacement measuring system is proposed, which can detect the 3-DOF translational motions of precision positioning devices. The optical system, which is composed of two diode-laser sources and two quadratic PSDs, is adapted to detect the position of the spherical reflector usually mounted on the platform of positioning devices. Each of the laser beams from diode-laser sources is reflected at the highly reflective surface of the sphere; hence, the 3-dimensional position of the sphere causes the directional change of the reflected beams, which is detected by the PSDs. In this paper, we define the relationships between the output values of the two PSDs and the 3-DOF translational motions of the sphere. Based on a deduced measurement model, we perform measurement simulation and evaluate the performance of the proposed measurement system: linearity, sensitivity, measuring range, and measurement error. The results show that the proposed measuring method is very useful for the measurement of the precision displacement of 3-DOF micro motions.