Leakage detector for liquid

Abstract

Abstract PURPOSE:To realize a quick and assured detection for leakage of the liquid, by receiving the light at the other end which is transmitted from one end of the linear light guide core covered at the outer circumference with the cladding to be permeated by the liquid detected and then detecting the reduction of the transmitted light volume which is due to the adhesion of the leaked liquid. CONSTITUTION:The light guide 10' covered with the cladding 11 which has a smaller refractive index than the linear light guide 10 and is permeated by the liquid of detection such as the oil or the like is provided on the outer circumfernece of the core 10. The light emitting element 18 and the photodetector 19 are provided at one and the other end of the light guide each, and thus the leakage of the liquid can be detected from the reduction of the transmitted light volume which is caused by adhesion of the leakage of the liquid like the oil, etc. to the guide 10'. For instance, the guide 10' is formed by binding together several pieces of the optical fiber 10 which are covered with the cladding 11 made of the silicone resin. Such guide 10' is then covered with the sheath 13 of the asbestos of the like and the protective tube 37 having the liquid transmissible property and the flexibility. Such light guides are laid into a mesh from and right under the bottom of the oil tank 15, and the output of the detector 19 is compared with the reference signal at the comparator 21 and by the amplifier 20 to give an operation to the alarm 22.

Inventors

• 👤 Masaya Tanaka
• 👤 Mitsuo Ono
• 👤 Sadao Degawa

Bibliographic Details