IMMERSION DETECTOR FOR OPTICAL CLOSURE, IMMERSION DETECTION METHOD FOR OPTICAL CLOSURE, OPTICAL CLOSURE

PROBLEM TO BE SOLVED: To develop a technology for understanding an immersion and the quantity of the immersion within a closure sleeve from the outside of the closure sleeve without opening the closure sleeve. SOLUTION: In an immersion detector 1 for an optical closure, a detection line 3 is extracted and extended from a detector body 2, and inserted into the closure sleeve 41 through a valve hole in a pressure valve 43 for a pressure test of a closure 4. Conductors are exposed at a tip of the detection line 3 comprising a pair of insulated electric wires within the detection line 3. The detector body 2 detects a current carried between the conductors through the immersion within the closure. The immersion detector 1 for the optical closure, an immersion detection method, and the optical closure suitably applied to the immersion detector and the immersion detection method are provided. COPYRIGHT: (C)2010,JPO&INPIT