Fabrication 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, comprising: Step 1, relying on the preparation process and technology of sapphire special material pipe rods to produce sapphire special material rods and sleeves; Step 2, based on The sapphire special material rod and sleeve provided in step 1 rely on the photonic crystal special fiber preparation process and technology to produce sapphire photonic crystal special fiber; step 3, based on the sapphire photonic crystal special fiber provided in step 2, rely on ultra-fast femtosecond Laser-engraved fiber grating preparation process and technology, manufacturing distributed fiber grating sensing units in sapphire photonic crystal special optical fibers; step 4, using high-temperature sensor packaging based on boron carbide high-temperature structural ceramic sleeves and high-temperature sensor packaging based on sapphire capillary tubes Technology, package and protect the sapphire photonic crystal special optical fiber with distributed fiber Bragg grating sensing unit provided in step 3, and prepare a sapphire photonic crystal fiber grating ultra-high temperature distributed sensor.

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...

AI Technical Summary

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.

Images