Double-clad layer scintillation optical fiber structure for super-long-distance radiation sensing

Abstract

The invention discloses a double-clad layer scintillation optical fiber structure for super-long-distance radiation sensing. The double-clad layer scintillation optical fiber structure comprises a fiber core, an inner clad layer, an outer clad layer, a coating layer and the like; the fiber core, the inner clad layer, the outer clad layer and the coating layer are cylindrical waveguides which are concentric with each other, the outer diameters of the cylindrical waveguides being sequentially increased; the refractive indexes of the fiber core, the inner clad layer, the outer clad layer and thecoating layer are sequentially reduced; the inner clad layer is doped with scintillating substances such as cerium, terbium and europium; high-energy rays act on the scintillating substances of the inner clad layer, so that fluorescent light can be generated; and the fluorescent light is subjected to total reflection and multi-mode transmission in the inner clad layer; part of the fluorescent light is subjected to single-mode low-loss transmission in the fiber core; and the transmission distance of the fluorescent light can reach tens of kilometers. With the double-clad layer scintillation optical fiber structure for the super-long-distance radiation sensing of the invention adopted, the defects of short sensing distance and low sensitivity of a common single-clad layer scintillation optical fiber can be eliminated. The double-clad layer scintillation optical fiber structure has the advantages of long detection distance, high corrosion resistance, low cost and easiness in preparation.With the double-clad layer scintillation optical fiber structure adopted, long-distance and distributed radiation dose monitoring and analysis can be realized.

Description

technical field [0001] The invention belongs to the field of sensing technology, in particular to a double-clad scintillation optical fiber structure for ultra-long-distance radiation sensing, which can be used in geological exploration, industrial detection, biomedical engineering, ocean current movement, aerospace and other fields in a timely and accurate manner. Compared with power sensors, it has the characteristics of low cost, real-time online, anti-electromagnetic interference, etc., and is especially suitable for distributed and large detection range applications. Background technique [0002] Radiation detection technology uses high-energy rays to cause physical or chemical changes in the sensing medium, including ionization effects, fluorescence effects, etc. Commonly used radiation detectors include semiconductor detectors, scintillator detectors and other types of radiation sensors, which have excellent performance in specific application scenarios. In practical...

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Problems solved by technology

At present, there is no scheme for radiation dose sensing a

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