Method for manufacturing a treated optical fiber for radiation-resistant temperature sensor
A technology of temperature sensor and optical fiber, applied in the direction of manufacturing tools, cladding optical fiber, instruments, etc., can solve the problems of transmission loss measurement failure, optical fiber sensor temperature and radiation limitation, etc.
Inactive Publication Date: 2016-10-26
FRAMATOME ANP +2
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Problems solved by technology
[0005] However, despite these interesting properties, state-of-the-art fiber optic sensors still have limitations in terms of temperature and radiation in harsh environments
For high temperatures such as above 300°C and for radiation above tens of kilograys (kGy, kiloray), by erasing the Bragg grating, and / or shifting the Bragg wavelength causing measurement drift, and / or the transmission loss of the optical fiber will produce a gradual failure of the measurement
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[0029] refer to figure 1 A temperature sensor 1 according to the invention is described. The temperature sensor 1 comprises a treated optical fiber 5 .
[0030] The temperature sensor 1 is for example intended to be placed in a nuclear reactor (not shown). For example, sensor 1 is used to measure the temperature of a heat transfer fluid such as water in the primary cooling circuit of a pressurized water reactor, or to measure the temperature of liquid sodium in a fast neutron reactor, or to measure the temperature of high-activity nuclear waste used in the manufacture or storage of The temperature of the facility.
[0031] To simplify, figure 1 Only a portion 10 of the treated optical fiber 5 extending along the axis D is shown.
[0032] The processed optical fiber 5 comprises a core 15 , a peripheral portion 20 sometimes referred to as an optical sheath surrounding the core 15 about an axis D, and a Bragg grating 25 located in the core 15 .
[0033] Alternatively (not sh...
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Abstract
The invention relates to a method (110) for manufacturing a treated optical fiber (5) for temperature sensor. Said method includes the following steps: a) producing (120) an optical fiber (125) made of pure silica or silica doped with one or more element(s) selected from among fluorine and nitrogen; b) imprinting (130), using a femtosecond laser, at least one Bragg grating onto the optical fiber so as to produce an imprinted fiber (135), the Bragg grating longitudinally extending into one portion of the imprinted fiber and being suitable for reflecting light waves propagating along the imprinted optical fiber, the laser having power greater than or equal to 450 mW; and c) annealing (140) at least the imprinted fiber portion so as to produce the treated optical fiber. The invention also relates to the use of one such treated optical fiber in a temperature sensor.
Description
technical field [0001] The invention relates to a method of manufacturing a treated optical fiber for a temperature sensor, wherein at least one Bragg grating is inscribed in the light using a laser, the Bragg grating being in a part of the optical fiber The top extends longitudinally and is adapted to reflect light waves propagating along the printed optical fiber. [0002] The invention also relates to methods of use of such treated optical fibers in temperature sensors. Background technique [0003] It is known to use optical fibers comprising Fiber Bragg Gratings (FPGs) to measure temperature. A Bragg grating consists of periodic interruptions of the refractive index of the fiber core along the fiber axis. Light with a broadband spectrum propagating along the core of the fiber is reflected by the grating around a certain wavelength called the "Bragg wavelength", which depends on the pitch of the grating. The Bragg wavelength varies according to the temperature of the ...
Claims
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IPC IPC(8): G02B6/02C03C25/6208
CPCG02B6/02185C03C25/6208B23K2103/54B23K26/0006C03B25/00G02B6/02128
Inventor 乔斯林·佩里斯阿德里安娜·莫拉那埃曼努埃尔·马林让-雷纳尔德·马塞西尔万·吉拉德
Owner FRAMATOME ANP