| 摘要 |
PROBLEM TO BE SOLVED: To provide a in-tube liquid detector for detecting the presence of a tube-inside liquid without being affected by air bubbles/oozing liquid/liquid drops, even if the air bubbles/oozing liquid/liquid drops develop at a part of a tube face. SOLUTION: A plurality of pairs of light-projecting parts and light-receiving parts are disposed along the periphery of a cylindrical tube in the cross section direction of the relevant tube, making a right angle with the axial direction thereof. Between the projection/reception parts and the cylindrical tube, a plurality of sets of optical path changing means are provided, wherein the inside surfaces join/contact with each other along the peripheral surface of the cylindrical tube. By the plurality of pairs of light-projecting and receiving parts, the existence of the in-tube liquid is detected, without being affected by air bubbles/oozing liquid/liquid drops, even if air bubbles/oozing liquid/liquid drops develop at a part of the tube face. COPYRIGHT: (C)2005,JPO&NCIPI |
