OPTICAL FIBER PROBE FOR MEASURING PH IN NUCLEAR REACTOR COOLING SYSTEM AND PH MEASURING SYSTEM USING SAME

摘要

The present invention relates to an optical fiber probe for measuring the pH level in a nuclear reactor cooling system and a pH measuring system using same, and more particularly, to an optical fiber probe for measuring the pH level in a nuclear reactor cooling system and a pH measuring system using same, which, by encircling the outer circumferential surface of the optical fiber that is inserted into a fluid channel with a protective tube, forming a waterproof film at the end portion of the optical fiber which is exposed from the protective tube, and by being equipped with a porous pH reactive film, which is formed by means of a sol-gel method, on the surface of the waterproof film, the degradation of the optical fiber due to direct contact with a high-temperature, high-pressure fluid can be prevented, and at the same time, the degradation of a pH reactive substance can be effectively prevented by impregnating the porous pH reactive film that is formed by means of the sol-gel method with the pH reactive material, thereby allowing accurate measurement of the pH of the fluid in a high temperature, high pressure environment, such as in the nuclear reactor cooling system.The optical probe for measuring the pH level in the nuclear reactor cooling system comprises: the optical fiber comprising a core and cladding for transmitting light; the protective tube which is formed so as to encircle the outer circumferential surface of the optical fiber that is inserted into the fluid channel; a waterproof film, which is connected to the end portion of the optical fiber that is exposed from the protective tube, for sealing the inside of the protective tube; a pH reactive film, which is provided at the upper portion of the waterproof film and is impregnated with the pH reactive substance that reacts to the fluid and changes color according to the pH of the fluid; and a cap which is formed in a hallow body shape provided with an open portion on one side, connected to one end of the optical fiber that is encircled with the protective tube via the open portion, and which is provided with an inlet port on the body which penetrates through the body so as to let the fluid that flows on the exterior of the body flow into the inside of the body.