Preparation process of sapphire photonic crystal fiber grating ultra-high temperature distributed sensor

Abstract

The invention provides a preparation process of a sapphire photonic crystal fiber grating ultra-high temperature distributed sensor. The preparation process comprises a first step of producing a sapphire special material rod body and a sleeve by virtue of a sapphire special material tube rod preparation process and technology; a second step of producing a sapphire photonic crystal special opticalfiber based on the sapphire special material rod body and the sleeve provided in the first step through the photonic crystal special optical fiber preparation process and technology, a third step of producing a distributed fiber grating sensing unit in the sapphire photonic crystal special optical fiber based on the sapphire photonic crystal special optical fiber provided in the second step through ultra-fast femtosecond laser engraving fiber grating preparation process and technology, and a fourth step of producing the sapphire photonic crystal fiber grating ultra-high temperature distributedsensor by packing and protecting the sapphire photonic crystal special optical fiber with the distributed fiber grating sensing unit provided in the third step through high temperature packaging based on a ceramic casing pipe with boron carbide high-temperature structure and the high-temperature sensor packaging technology based on sapphire capillary tubes.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a preparation process of a sapphire photonic crystal fiber grating ultra-high temperature distributed sensor. Background technique [0002] In 2016, among the top 100 projects and projects planned to be implemented in China's 13th Five-Year Plan, aero-engines and gas turbines ranked first, which reflects the country's great importance to the aero-engine industry. An advanced engine determines the performance of military aircraft such as fighter jets to a certain extent, and aero-engines have always been the bottleneck restricting domestic military aircraft. The aero-engines and gas turbines are placed in such an important position, which shows that the country is determined to solve aviation power. ill. [0003] When a high-performance aero-engine is running, the airflow temperature after the combustion chamber and the surface temperature of the high-temperature rotating hot...

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Problems solved by technology

The non-contact measurement method is more suitable for testing the temperature field distribution on the surface of high-temperature structures. In other words, it is limited to the temperature field measurement on the surface of the structure that can be covered by the detection light source, but it cannot be carried out on the inside of the structure or the position that the detection light source cannot cover. Temperature measurement, at the same time, is susceptible to interference from environmental background radiation noise and reduces the temperature test accuracy

The contact measurement method can achieve direct contact with the measured heat source, and can take into account the temperature measurement needs of the surface and interior of the measured structure. The main sensors used are metal / non-metal thermocouple sensors and black body cavity sapphire fiber sensors. However, the former is due to Due to the high-temperature instability and weak anti-electromagnetic interference of the material itself, it cannot be used for high-temperature measurement in complex electromagnetic environments for a long time, and the latter is due to the low tensile strength of the sensor itself, complex preparation process, The high temperature limit temperature is slightly lower (the high temperature limit temperature is generally about 1300 ℃, and the short-term ultra-high temperature limit temperature is only 1600 ℃) and other factors, but it is only used in the high temperature static measurement of the structure under test at present.

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