An infrared fiber-optic probe for measuring the temperature of coolant system of nuclear power plant and the temperature measurement system using the same

摘要

The present invention relates to an insertion type infrared optical fiber probe for measuring the temperature of a nuclear reactor cooling system, and to a temperature measuring system using same, and more particularly, to an insertion type infrared optical fiber probe for measuring the temperature of a nuclear reactor cooling system, and to a temperature measuring system using same, the probe comprising a cap which is connected to one end of one side of the optical fiber that transmits penetrated infrared rays so as to comprise the probe for transmitting via the optical fiber the infrared rays, which are radiated from the inner circumferential surface of the cap, wherein the probe is directly inserted into a fluid channel in the cooling system for detecting the infrared rays which radiate from the inner circumferential surface of the cap, which is heat parallel to the fluid, and for measuring the temperature of the fluid, so that the temperature can be measured more accurately in real time in a high temperature and high pressure environment, such as in the nuclear reactor cooling system, without the corrosion of the probe or influence of electromagnetic waves. The insertion type optical fiber probe for measuring the temperature of the nuclear reactor cooling system, according to the present invention, comprises: the optical fiber comprising a core and cladding for transmitting the infrared rays; a protective tube which is formed so as to encircle the outer circumferential surface of the optical fiber; and the 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 the inner wall of the body being coated with an infrared ray radiating substance for radiating infrared rays according to the temperature of the fluid which flows on the exterior of the body, so that the infrared rays, which are radiated from the infrared ray radiating substance in accordance with the temperature of the fluid which flows on the exterior of the cap, are transmitted through the optical fiber.