Temperature-resistant hydrogenated wiredrawing tower grating array and preparation method thereof

Abstract

The invention relates to a temperature-resistant hydrogenated wiredrawing tower grating array and a preparation method thereof, and the preparation method comprises the following steps: carrying out melting wiredrawing, grating inscribing and organic matter coating on an optical fiber preform to prepare a seed grating array optical fiber with a coating; carrying out hydrogen carrying treatment on the seed grating array optical fiber to obtain a hydrogen carrying optical fiber; carrying out fixed-point heating on the array grating of the hydrogen-loaded optical fiber, and carrying out hydrogen curing treatment to obtain a hydrogen-cured optical fiber; and carrying out dehydrogenation treatment on the hydrogen-cured optical fiber to obtain the temperature-resistant hydrogenated drawing tower grating array. The temperature-resistant hydrogenated grating array optical fiber has low transmission loss, and a manufactured grating sensing network can work for a long time and a long distance at the temperature of 500 DEG C or below and can stably work within 10 hours at the temperature of 600 DEG C.

Description

technical field [0001] The invention belongs to the field of fiber grating manufacturing, and relates to a temperature-resistant hydrogenated drawing tower grating array and a preparation method. Background technique [0002] The drawing tower fiber grating can carry out long-distance and large-capacity sensing transmission, but the drawing tower grating has poor temperature resistance and can only work stably at a lower temperature (such as 100 ° C), while the petroleum and petrochemical industries, including underground and deep-sea oil exploration and acoustic detection, the grating is expected to work at temperatures as high as 300°C and above. When subjected to heat treatment at 300°C, the reflectivity of conventional drawing tower gratings will decline sharply, and its final reflectivity is only 8% of the initial reflectivity. Left and right, the sharp weakening of its reflected signal makes it impossible for long-distance sensing transmission. [0003] It is an impor...

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Problems solved by technology

[0002] Drawing tower fiber gratings can carry out long-distance and large-capacity sensing transmission, but the drawing tower gratings have poor temperature resistance and can only work stably at lower temperatures (such as 100°C), while petroleum and petrochemical industries, including underground For deep-sea oil exploration and acoustic detection, it is expected that the grating will work at a temperature as high as 300°C and above, and the reflectivity of the conventional drawing tower grating will be sharply attenuated when it is heat-treated at 300°C, and its final reflectivity is only 8% of the initial reflectivity. Left and right, the sharp weakening of its reflected signal makes it impossible for long-distance sensing transmission

[0003] It is an important part of the production process of traditional fiber gratings to enhance the photosensitivity by carrying hydrogen on the fiber. At the same time, the temperature stability of the hydrogen-carrying fiber Bragg grating is also significantly improved; The transmission loss makes the optical fiber unable to carry out long-distance sensing transmission

However, due to the fact that the hydrogen molecules diffused into the fiber core at room temperature and high pressure are physically dissolved in the fiber core, hydrogen molecules will slowly precipitate out of the fiber core as time goes on under normal pressure, and the fiber loss will slowly return to the previous level. level

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