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The Error Analysis of Leak Measurement for Pneumatic Cylinder Using Isothermal Chamber
Jiseong Jang,Sangwon Ji,Toshiharu Kagawa 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.1
ISO pneumatic cylinder reliability test requires air leakage measurement. Air cylinder has many parts and the leakage shall be measured before, during and after endurance test, and, the leakage should smaller than the specified value. The existing measurement method needs complex operation and the calibration of leak detector, and, has to separate the testing cylinder from endurance the air leakage during endurance test, and guarantee the reliability of the conventional measurement method. In this paper, a new method for air leakage measurement using isothermal chamber, which does not requires calibration or temperature compensation, and, can measure air leakage accurately with quite simple operations, is proposed. As a result, reliability of air leakage measurement can be improved because the proposed method does not have to separate the testing cylinder from the endurance test device for air leakage measurement. The effectiveness of the proposed method is proved by error analysis of leak measurement from experimental result.
Lee, Sangyeob,Jang, Jiseong,Cho, Kyung Soo,Oh, Yong-Jun,Hong, Ki-Ha,Song, Soomin,Kim, Kihwan,Eo, Young-Joo,Ho Yun, Jae,Gwak, Jihye,Chung, Choong-Heui Elsevier 2019 Solar energy Vol.180 No.-
<P><B>Abstract</B></P> <P>Silver nanowire (AgNW) electrodes have been employed in solar cells as transparent conducting electrodes (TCEs). When a AgNW electrode is used as a network-type TCE in solar cells, photogenerated charge carriers must laterally travel to reach AgNW networks. If the empty space of the network is larger than the lateral collection length of the charge carriers ( <SUB> L lc </SUB> ), a significant fraction of the charge carriers will be lost. Therefore, determination of <SUB> L lc </SUB> is essential for choosing and/or designing a suitable network for solar cells. Here, we develop a method to relate the lateral photocurrent measured from a specially designed pattern to the <SUB> L lc </SUB> value. We apply this method to Cu(In,Ga)Se<SUB>2</SUB> thin-film solar cells with AgNW TCEs. The <SUB> L lc </SUB> value was determined to be ≈ 26 μm in the CdS/CIGS/Mo structure under 1-sun illumination. The measured lateral collection length is much larger than the normal spacing between AgNWs, indicating a high lateral collection efficiency in AgNW TCE-based CIGS thin-film solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lateral collection length is important for network-electrode-based solar cells. </LI> <LI> A method to determine the lateral collection length is developed. </LI> <LI> The lateral collection length for Cu(In,Ga)Se<SUB>2</SUB> solar cells was 26 μm under 1-sun. </LI> <LI> The method can be aaplied to other solar cells with network-transparent-electrodes. </LI> </UL> </P>