| 摘要 |
PCT No. PCT/FR86/00300 Sec. 371 Date May 6, 1987 Sec. 102(e) Date May 6, 1987 PCT Filed Sep. 10, 1986 PCT Pub. No. WO87/01801 PCT Pub. Date Mar. 26, 1987.The subject of the invention is a device for the detection of imminent gas depletion of a liquified gas tank, comprising a bundle of fiber optics (22), one end of which, forming an observation surface is visible from the outside of the tank, and other end of which, placed inside of the tank, is in optical contact with a flat surface of a transparent element (20), comprising, on its opposite surface, at least one dioptricelement (26). According to the invention, the lateral walls of the element (26) form with said surface an angle, preferably obtuse, the dimensions of which are such that it is capable, as long as there is liquid gas remaining in the reservoir, of being covered, almost totally, by a mensicus formed of a liquid gas condensate, which thus prevents any total reflection on said surface, of the rays directed by the fiber beams. |
