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CN-122015931-A - Radiation-resistant protection structure of sapphire optical fiber high-temperature sensor

CN122015931ACN 122015931 ACN122015931 ACN 122015931ACN-122015931-A

Abstract

The invention relates to the technical field of radiation protection of optical fiber sensors, in particular to a radiation-resistant protection structure of a sapphire optical fiber high-temperature sensor, which comprises a sapphire optical fiber high-temperature sensor, and a radiation-resistant protection shell sleeved outside the sapphire optical fiber high-temperature sensor, wherein the radiation-resistant protection shell sequentially comprises a protection gas filling chamber, a radiation-resistant protection material filling chamber and an outermost high-temperature shell from inside to outside, the high-temperature shell is made of an alloy or ceramic material resistant to high temperature of 800-1600 ℃, one end of the high-temperature shell is airtight, the protection gas filling chamber is an annular cavity filled with protection gas, the radiation-resistant protection material filling chamber is an annular cavity filled with a protection layer formed by mixing and solidifying the radiation-resistant protection material and high-temperature glue, and the mixed radiation-resistant protection layer is used for effectively preventing cracking and embrittlement under extreme high-temperature conditions and bearing heat stress tension of the mixed radiation-resistant protection layer is borne by the firm high-temperature shell. The invention has reliable structure and excellent protection effect, and can realize stable work under the environment of extreme high temperature and large radiation dose.

Inventors

  • LIU GUANGHE

Assignees

  • 蓝精微(上海)科技有限公司

Dates

Publication Date
20260512
Application Date
20260128

Claims (7)

  1. 1. The radiation-resistant protection structure of the sapphire optical fiber high-temperature sensor comprises a sapphire optical fiber high-temperature sensor (1) and is characterized by further comprising a radiation-resistant protection shell (2) sleeved outside the sapphire optical fiber high-temperature sensor (1), wherein the radiation-resistant protection shell (2) sequentially comprises the following components from inside to outside: A shielding gas filling chamber (23), a radiation-resistant shielding material filling chamber (22) and an outermost high-temperature envelope (21); the high-temperature shell (21) is made of alloy or ceramic material which can resist high temperature of 800-1600 ℃, and one end of the high-temperature shell is sealed; the radiation-resistant protective material filling chamber (22) is an annular cavity, and a protective layer formed by mixing and curing the radiation-resistant protective material (222) and the high-temperature glue (24) is filled in the annular cavity.
  2. 2. The radiation-resistant protective structure of the sapphire optical fiber high-temperature sensor of claim 1, wherein a radiation-resistant protective material injection port (221) is formed in the height Wen Baoke (21), and the injection port is communicated with the radiation-resistant protective material filling chamber (22).
  3. 3. The radiation-resistant shielding structure of a sapphire optical fiber high-temperature sensor of claim 1, wherein the shielding gas (231) is an inert gas or a protective gas.
  4. 4. The radiation-resistant protective structure of a sapphire optical fiber high-temperature sensor of claim 1, wherein the radiation-resistant protective material (222) is a polymer-based coating material.
  5. 5. The radiation-resistant protective structure of the sapphire optical fiber high-temperature sensor of claim 1, wherein the thickness of the protective layer formed by mixing and curing the high-temperature adhesive is not less than 1mm.
  6. 6. The radiation-resistant protection structure of the sapphire optical fiber high-temperature sensor according to claim 1, wherein the open end of the high Wen Baoke (21) is further provided with a connecting packaging piece (25), and the tail fiber of the sapphire optical fiber high-temperature sensor (1) passes through the connecting packaging piece (25) and then is connected with a transmission optical cable (26) and an optical fiber connector (27).
  7. 7. A system of sensors, which are arranged in a sensor array, characterized by comprising the following steps: the radiation resistant protective structure of any one of claims 1-6; an optical fiber sensor signal demodulator (3) connected with the radiation-resistant protective structure through an optical fiber connector (27); Wherein the radiation resistant shielding structure is configured to be inserted into a high temperature, high radiation heat chamber (4).

Description

Radiation-resistant protection structure of sapphire optical fiber high-temperature sensor Technical Field The invention relates to the technical field of radiation protection of optical fiber sensors, in particular to a radiation-resistant protection structure of a sapphire optical fiber high-temperature sensor. Background The sapphire optical fiber (the main component is Al 2O3 monocrystal) can bear the high temperature of 800-1600 ℃ and is widely applied to sensing measurement in an extremely high-temperature environment. However, in the application scenario of nuclear power plants and the like, the sensor is not only exposed to extremely high temperature (not less than 800 ℃) but also needs to bear large-dose radiation (not less than 10 6 Gy). High energy radiation (e.g., gamma rays, X-rays, neutrons) interacts with the fiber material, resulting in ionization of atoms to produce chromophores (point defects), resulting in attenuation of optical signals, refractive index changes, and structural degradation of the material, and even irreversible permanent damage. Currently, conventional radiation-resistant protection is mostly in the form of thin film coatings. However, the protection form is easy to lose efficacy due to falling and cracking at extremely high temperature, and cannot meet the long-term stable operation requirements of high-temperature and high-radiation application scenes such as nuclear power and the like. Therefore, a new radiation-resistant protective structure is urgently needed to protect the performance and lifetime of the sapphire optical fiber sensor in severe environments. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the radiation-resistant protection structure of the sapphire optical fiber high-temperature sensor, which has reliable structure and excellent protection effect and realizes stable work under the environment of extreme high temperature and large radiation dose. The invention is realized by the following technical scheme: The radiation-resistant protective structure comprises a sapphire optical fiber high-temperature sensor, and further comprises a radiation-resistant protective cladding sleeved outside the sapphire optical fiber high-temperature sensor, wherein the radiation-resistant protective cladding sequentially comprises the following components from inside to outside: a shielding gas filling chamber, a radiation-resistant shielding material filling chamber and an outermost high-temperature shell; The high-temperature cladding is made of alloy or ceramic material which can resist the high temperature of 800-1600 ℃, and one end of the high-temperature cladding is sealed; the radiation-resistant protective material filling chamber is an annular cavity, and a protective layer formed by mixing and curing the radiation-resistant protective material and high-temperature glue is filled in the annular cavity. The radiation resistant protective material of the present invention is encapsulated within a rigid structure formed by a high temperature enclosure. The high-temperature glue plays a main role in bonding and fixing, and simultaneously prevents the breakage and embrittlement of the radiation-resistant protective material under the high-temperature condition, and the heat stress tension born by the high-temperature glue is borne by a firm high-temperature shell rather than directly acting on the optical fiber sensor. The structural design enables radiation-resistant materials (such as polymers) sensitive to high temperatures to remain structurally intact and shielded in environments far beyond their own temperature limits. The structure of the invention is a standardized sandwich module, and can select neutron absorbing materials such as boron-containing polymers and the like as filling materials for environments with neutron radiation as a main part, and can select ceramics with higher temperature resistance as a cladding for higher temperature. The design enables a set of core schemes to be widely suitable for different application scenes such as nuclear reactors, spent fuel pools and the like through adjustment of component materials. The outermost high temperature shell is used as a main bearing structure to bear mechanical stress and thermal shock, and the inner filling layer is focused on functional protection. The connection package ensures a good seal at the fiber exit. The modular design with definite labor division ensures the long-term stability of the integral operation of the sensor after the sensor is inserted into the high-temperature high-radiation hot chamber. Further, a radiation-resistant protective material injection port is formed in the high-temperature cladding, and the injection port is communicated with the radiation-resistant protective material filling chamber. Preferably, the shielding gas is an inert gas or other shielding gas. Further, the radiation-resistant protective material is a polymer-base