CN117368242A

CN117368242A - Plastic scintillating fiber array imaging sensor and X-ray imaging system

Info

Publication number: CN117368242A
Application number: CN202311306039.1A
Authority: CN
Inventors: 胡志家; 任港; 李思祺; 汪周远航
Original assignee: Anhui University
Current assignee: Anhui University
Priority date: 2023-10-09
Filing date: 2023-10-09
Publication date: 2024-01-09

Abstract

The invention relates to the technical field of radiation imaging, in particular to a plastic scintillating fiber array imaging sensor and an X-ray imaging system, wherein the X-ray imaging system comprises an X-ray source, a scintillating fiber array imaging sensor, a reflecting unit and a CCD camera, wherein the plastic scintillating fiber array imaging sensor is formed by arranging plastic scintillating fibers with a certain length into a two-dimensional array along the direction parallel to detected rays, two flat surfaces which are ground and smooth are arranged at two ends of the fiber array, a beta-diketone complex of rare earth europium is contained in a core layer of the scintillating fibers as a scintillator, and the scintillating fibers have the characteristics of high light emission and high stability, and the transmission loss of visible light in the fibers is small, so that the X-ray imaging system can realize high-resolution and long-distance imaging.

Description

Plastic scintillating fiber array imaging sensor and X-ray imaging system

Technical Field

The invention relates to the technical field of radiation imaging, in particular to a plastic scintillating fiber array imaging sensor and an X-ray imaging system.

Background

X-ray imaging is widely applied to the fields of medicine, biology, security protection, industrial detection and evaluation and the like. Particularly in the medical aspect, as a common detection means, the development of imaging technology is particularly important. Traditionally, inorganic scintillator blocks are typically used as the sensing units of imaging systems. The most commonly used are cadmium tungstate (CdWO 4), cesium iodide (CsI), bismuth Germanate (BGO), and the like. Generally, such scintillation crystals are costly to manufacture and are subject to deliquescence during use. In the fields of medical imaging, etc., a larger volume of scintillation crystal is generally required, which has higher requirements on production technology. Meanwhile, in order to improve efficiency or sensitivity, a thicker scintillation material is generally required. However, thicker scintillators can result in greater isotropic propagation of light generated in the scintillating material, thereby reducing the spatial resolution of the imager.

The scintillating fiber takes a scintillator (mainly an organic scintillator) as a fiber core, and can convert high-energy rays (such as X-rays) into visible light or ultraviolet light. In the last decades, scintillating fibers have been widely studied due to their small size, long transmission distance, high interference resistance, and high flexibility. Scintillation optical fibers have found wide application in the fields of medical diagnostics, high energy physics, petroleum exploration, and the like.

Disclosure of Invention

Aiming at the problems of using a scintillation crystal block as a sensing unit in the existing imaging system, the invention provides a plastic scintillation fiber array imaging sensor and an X-ray imaging system.

In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:

the imaging sensor is formed by arranging plastic scintillating fibers with a certain length into a two-dimensional array along the direction parallel to the detected rays, wherein two ends of the plastic scintillating fiber array are two flat surfaces which are ground and leveled, the plastic scintillating fibers comprise a core layer and a cladding layer, the core layer contains beta-diketone complex of rare earth europium as a scintillator, and the refractive index of the core layer is higher than that of the cladding layer.

As can be seen from the above description, the imaging sensor of the plastic scintillation fiber array has a simple structure and low manufacturing cost, is formed by using a europium beta diketone complex as a plastic scintillation fiber of a core layer scintillator, utilizes the effect of ligand sensitization rare earth ion luminescence (namely the Antenna effect), when the scintillator material of the core layer is irradiated by radiation, the rare earth complex can absorb the radiation to be converted into red visible light, the light can propagate in the fiber between the fiber core and the cladding layer through the total reflection effect, and meanwhile, the fiber array has the characteristics of high luminescence and high stability based on the performance of the rare earth complex, and the transmission loss of the visible light in the fiber is small, so that the imaging with high resolution and long distance can be realized.

As an improvement, the peripheral ring surface of the plastic scintillation optical fiber and the end surface for receiving the detected rays are plated with high-reflection films; crosstalk between optical fibers and loss of light can be reduced by the highly reflective film.

As an improvement, the plastic optical fiber module further comprises a plastic mould, wherein the plastic scintillating optical fibers are arranged in the plastic mould in parallel to form a two-dimensional array, and the plastic mould is manufactured by a 3D printing technology; the plastic mould can be easily manufactured through the 3D printing technology, then plastic scintillating fibers are arranged in the mould, so that the stable forming of the fiber array is facilitated, and moulds with different shapes can be manufactured according to imaging requirements, so that different fiber array forms are realized, the wide application is facilitated, the fibers can be recycled, and the environment-friendly effect is realized.

Specifically, the core substrate is composed of a copolymer of a methacrylate monomer and an acrylate monomer or a homopolymer of an aromatic monomer having a vinyl group, and the cladding is composed of a copolymer of a methacrylate monomer and an acrylate monomer or a homopolymer of a fluorinated monomer; by adding the thermal initiator and the photoinitiator, the material can easily form a polymer only by heating or light irradiation, the preparation process is simple, and meanwhile, the polymer has good transparency, so that the transmission loss of visible light in the optical fiber is smaller.

Preferably, the plastic scintillating fiber is prepared by the following method, and the steps comprise:

s101, preparing a hollow polymer preform:

taking a polymer monomer solution, adding an initiator and a chain transfer agent into the polymer monomer solution, and fully stirring by ultrasonic to obtain a cladding polymer solution;

pouring the cladding polymer solution into a Teflon tube with a Teflon rod in the center, then putting into an oven for prepolymerization, taking out and cooling after the solution becomes viscous;

cooling to room temperature, putting into an oven again for polymerization, after the solution is hardened, completing polymerization to form a polymer preform, taking the polymer preform out of a Teflon tube, and pulling out the Teflon rod to obtain a hollow polymer preform, namely forming a cladding structure of the plastic scintillation optical fiber;

s102, preparing a doped polymer preform:

taking a polymer monomer solution, adding an initiator, a chain transfer agent and a beta-diketone complex of rare earth europium into the polymer monomer solution, and fully stirring by ultrasonic to obtain a core layer polymer solution;

pouring the core polymer solution into the hollow polymer preform prepared in the step S101, sealing the hollow polymer preform, then putting the hollow polymer preform into an oven for prepolymerization, taking out the hollow polymer preform after the solution becomes viscous, and cooling the hollow polymer preform;

Cooling to room temperature, putting into an oven again for polymerization, and after the solution is hardened, completing the polymerization to form a doped polymer preform, namely forming a core layer structure in the cladding structure of the plastic scintillation optical fiber;

s103, drawing a polymer optical fiber:

and (3) placing the doped polymer preform into a drawing tower to heat the doped polymer preform, and after the doped polymer preform is softened, performing rod unloading and drawing to draw a polymer optical fiber, thus obtaining the plastic scintillating optical fiber.

The preparation method has the following advantages:

1. the plastic scintillating fiber prepared by the preparation method has good transparency, high light-emitting property and high stability;

2. the preparation method is simple to operate, low in production cost and convenient to implement, and can be popularized and applied on a large scale;

preferably, in step S101: adding an initiator with the mass fraction of 0.1-0.5% and a chain transfer agent with the mass fraction of 0.1-0.5% into a polymer monomer solution, wherein the initiator is a peroxide or azo compound, and the chain transfer agent is mercaptan; the temperature during the pre-polymerization is 80 ℃ and the polymerization time is 30min-90min until the solution becomes viscous; the temperature during polymerization is increased from 50 to 70 ℃ to 5 ℃ every 12 hours, and the temperature is gradually increased to 80 to 100 ℃ until the solution is hardened; the polymerization temperature is not high, the required production device is simple, the reaction rate is accelerated and the reaction energy is reduced by the catalytic reaction of the initiator, so that the reaction is promoted, the molecular chain length of the mercaptan can be finely controlled in the polymerization process, the processing condition is simplified, and the mechanical property of the generated polymer is optimized.

Preferably, in step S102: adding an initiator with the mass fraction of 0.1-0.5%, a chain transfer agent with the mass fraction of 0.1-0.5% and a beta-diketone complex of rare earth europium with the mass fraction of 0.5-5% into a polymer monomer solution, wherein the initiator is a peroxide or azo compound, and the chain transfer agent is mercaptan; the temperature during the pre-polymerization is 80 ℃ and the polymerization time is 30min-90min until the solution becomes viscous; the temperature during polymerization is increased from 50 to 70 ℃ to 5 ℃ every 12 hours, and the temperature is gradually increased to 80 to 100 ℃ until the solution is hardened; the polymerization temperature is not high, the required production device is simple, the reaction rate is accelerated and the reaction energy is reduced by the catalytic reaction of the initiator, so that the reaction is promoted, the molecular chain length of the mercaptan can be finely controlled in the polymerization process, the processing condition is simplified, and the mechanical property of the generated polymer is optimized.

Preferably, in step S103: the temperature of the drawing tower is set to 140-240 ℃ and the heating time is 1-3 hours until the optical fiber preform rod begins to soften; the lower rod speed of the drawing tower is 0.5-3mm/min, the traction speed is 0.2-1.5m/min, and the diameter of the drawn polymer optical fiber is 200-1000 mu m.

Preferably, the rare earth europium beta-diketone complex is prepared by the following method, and the steps comprise:

s201, dissolving europium chloride in an ethanol solution to obtain a europium chloride ethanol solution;

s202, respectively dissolving a first ligand and a second ligand in corresponding proportion in ethanol solution for standby according to the molecular formula of the synthesized complex, and obtaining a first ligand ethanol solution and a second ligand ethanol solution, wherein the first ligand is trifluoroacetylacetone, hexafluoroacetylacetone, 2-thiophenoyltrifluoroacetone, dibenzoylmethane, acetylacetone or benzoylacetone, and the second ligand is triphenylphosphine oxide or 1, 10-phenanthroline;

s203, heating the europium chloride ethanol solution in a water bath, adding a first ligand ethanol solution for reaction, then adding a sodium hydroxide aqueous solution for regulating the pH value of the solution to be 6.0-6.5, and then adding a second ligand ethanol solution for reaction, wherein reflux stirring is kept until the reaction is finished;

s204, after the reaction is finished, filtering the reaction solution to obtain a crude product;

s205, washing the crude product with ethanol for three times, and drying to obtain the rare earth europium beta-diketone complex.

From the above description, the preparation method has the following advantages:

1. The preparation process is simple to operate and convenient to implement: the water bath heating temperature is 60 ℃ in the synthesis process, and the conditions are easy to reach; the solvent is absolute ethyl alcohol, so that the method is nontoxic and low in cost, and the synthesized waste liquid does not need additional treatment and is harmless to the environment; after precipitation, no other operation is needed, only filtration and drying are needed, the synthesis process is simple, and expensive equipment is not needed.

2. Low cost, mass production, low cost of synthetic raw materials, and low cost of industrial grade raw materials (such as europium chloride (EuCl) ₃ .6H ₂ O) 1kg 600-membered, 2-thenoyltrifluoroacetone 1kg 1450-membered etc.) europium-synthesizing beta-diketone complexThe cost price of the material is far lower than the manufacturing cost of the scintillators sold in the market.

3. The prepared beta-diketone complex of rare earth europium has high luminous intensity because: the absorption coefficient of lanthanide ions in the ultraviolet-visible light region is smaller, the luminous efficiency is lower, the light absorption capacity of the organic ligand is stronger, if the energy absorbed by the organic ligand is effectively transferred to the central ion, the introduction of the organic ligand can make up the defect of small absorption coefficient of the lanthanide ions, and the luminous intensity is improved, so that the europium beta-diketone complex greatly enhances the luminescence of the lanthanide ions europium.

In order to achieve the technical purpose, the invention provides another technical scheme as follows:

an X-ray imaging system based on a scintillating fiber array imaging sensor comprises an X-ray source, the scintillating fiber array imaging sensor, a reflecting unit and a CCD camera, wherein the X-ray source emits X-rays, the X-rays pass through an object to be detected, the scintillating fiber array imaging sensor absorbs the X-rays transmitted through the object to be detected and emits scintillating light, and the scintillating light is received by the CCD camera after being reflected by the reflecting unit. The X-ray imaging system has the advantages of high sensitivity and simple structure, and can be widely applied to real-time detection in various fields such as military, industrial nondestructive detection, biomedical engineering and the like.

Drawings

FIG. 1 is a schematic diagram of ligand to rare earth ion energy transfer;

FIG. 2 is a cross-sectional view of a plastic scintillation fiber of the present application;

FIG. 3 is a perspective view of a plastic scintillating fiber preform;

FIG. 4 is a flow chart for making a plastic scintillation fiber;

fig. 5 is a schematic view of a teflon tube mold;

FIG. 6 is a physical view of a plastic scintillating fiber preform;

FIG. 7 is a pictorial view of a plastic scintillation fiber;

FIG. 8 shows the Eu (TTA) ₃ TPPO ₂ A luminous intensity contrast graph of plastic scintillation fiber serving as a scintillator and BGO crystal;

FIG. 9 shows the Eu (TTA) ₃ TPPO ₂ A change chart of luminous intensity of the plastic scintillating fiber serving as a scintillator under the irradiation of one hour X-rays;

FIG. 10 shows the Eu (TTA) ₃ TPPO ₂ A comparison graph of the measurement results of the radiation luminescence stability of the plastic scintillating fiber of the scintillator;

FIG. 11 shows Eu (TTA) ₃ TPPO ₂ Is a combination of the absorption spectrum and the emission spectrum of the light source.

FIG. 12 is a schematic diagram of a plastic scintillating fiber array imaging sensor;

FIG. 13 is a physical effect diagram of a plastic scintillating fiber array imaging sensor;

FIG. 14 is a schematic diagram of an X-ray imaging system configuration;

FIG. 15 is a graph showing the contrast between the imaging effect of the screw and the object measured by the X-ray imaging system;

FIG. 16 is a graph showing the contrast of the imaging effect of an iron ring measured by an X-ray imaging system with a real object;

reference numerals:

101. core layer, 102. Cladding layer;

201. plastic scintillating fiber, 202 mold;

x-ray source, 302, measured object, 303, scintillation fiber array imaging sensor, 304, reflection unit, 305.

Detailed Description

Embodiments of the present invention will be described in detail with reference to fig. 1 to 16, but the claims of the present invention are not limited thereto.

As shown in fig. 1, it is generally believed that ligand energy transfer to rare earth ions can be divided into three steps:

(1) The ligand undergoes pi-pi absorption, and the electron transition from the S0 singlet state to the S1 singlet state can return to S0 in a radiation mode. Ligand fluorescence is generated or via intersystem crossing to triplet state T.

(2) The lowest excited triplet state T1 may radiatively emit a ligand phosphorescence back to the ground state or energy transfer to the vibrational level of the rare earth ion, the ground state electrons of which are excited to transition to the excited state.

(3) The characteristic fluorescence of the rare earth ion is emitted when the electron returns from the excited state energy level to the ground state.

The light emitting mechanism is that the ligand transfers the absorbed energy to the rare earth ion through energy transfer so as to make the rare earth ion emit characteristic fluorescence, wherein the ligand can play a role in sensitizing the rare earth ion to emit light. This ligand sensitized rare earth ion luminescence effect is known as the Antenna effect.

Based on the above effects, the invention provides a plastic scintillation fiber with high luminescence and high stability, as shown in fig. 2 and 3, the fiber comprises a core layer 101 and a cladding layer 102, wherein the core layer 101 contains beta-diketone complex of rare earth europium as a scintillator, and the refractive index of the core layer 101 is higher than that of the cladding layer 102. Wherein:

the core layer 1 substrate is constituted of a copolymer formed of a methacrylate monomer and an acrylate monomer or a homopolymer formed of an aromatic monomer having a vinyl group, for example: a copolymer of Methyl Methacrylate (MMA) and Butyl Acrylate (BA) (the polymer matrix formed has good transparency, and the material has small transmission loss in the visible light band), or a homopolymer of Styrene (SM) (the material has the advantages of light weight, good transparency and high mechanical strength);

Cladding 102 is composed of a copolymer of methacrylate monomers and acrylate monomers or a homopolymer of fluorinated monomers, such as: the polymer matrix formed from a copolymer of Methyl Methacrylate (MMA) and Butyl Acrylate (BA) with good transparency and a low transmission loss of this material in the visible range, or the homopolymer formed from a perfluoroalkyl methacrylate with a minimum transmission loss of the fluoropolymer, such as 3FMA (2, 2-trifluoroethyl methacrylate).

The working principle of the optical fiber is as follows: when the scintillator of the core is irradiated with radiation, the rare earth complex therein converts the radiation absorption into red visible light, which propagates in the fiber by total reflection between the core 1 and the cladding 2.

Based on the above inventive concept, embodiments were constructed:

1. the beta-diketone complex of rare earth europium is prepared as follows:

s1, dissolving europium chloride in an ethanol solution to obtain a europium chloride ethanol solution;

s2, respectively dissolving a first ligand and a second ligand in corresponding proportion in ethanol solution for later use according to the molecular formula of the synthesized complex, and obtaining a first ligand ethanol solution and a second ligand ethanol solution, wherein the first ligand can be beta-diketone complexes such as Trifluoroacetylacetone (TFA), hexafluoroacetylacetone (HFA), 2-Thenoyl Trifluoroacetone (TTA), dibenzoylmethane (DBM), acetylacetone (AA), benzoylacetone (BZA) and the like, and the second ligand can be triphenylphosphine oxide (TPPO), 1, 10-phenanthroline (Phen) and the like;

S3, heating the europium chloride ethanol solution in a water bath, adding the first ligand ethanol solution to react, then adding the sodium hydroxide aqueous solution to adjust the pH value of the solution to 6.0-6.5, keeping the water bath temperature at 60 ℃, keeping reflux and stirring for 30 minutes, adding the second ligand ethanol solution to react, keeping the water bath temperature at 60 ℃, and keeping reflux and stirring for 5 hours until the reaction is finished;

s4, after the reaction is finished, filtering the reaction solution to obtain a crude product;

s5, washing the crude product with ethanol for three times, and drying to obtain the rare earth europium beta-diketone complex.

2. The process for manufacturing the plastic scintillation optical fiber is shown in fig. 4, and specifically comprises the following steps:

s1, preparing a hollow polymer preform:

s11, taking a polymer monomer solution, adding an initiator with the mass fraction of 0.1-0.5% and a chain transfer agent with the mass fraction of 0.1-0.5% into the polymer monomer solution, and fully stirring by ultrasonic to obtain a cladding polymer solution, wherein:

the initiator may be a peroxide or an azo compound (for example, a peroxide such as dibenzoyl peroxide (BPO), dibenzoyl peroxide (MPB), lauroyl Peroxide (LPO), diisopropyl peroxydicarbonate (IPP), cumene Hydroperoxide (CHP), or an azo compound such as azobisisobutyl ester (ABVN) or Azobisisobutyronitrile (AIBN);

The chain transfer agent may be a thiol (e.g., n-butanol) or other agent having a structure of R-SH (where R represents an organic group), and is not particularly limited. The thiol allows for fine control of the molecular chain length during the polymerization process, thereby simplifying processing conditions and optimizing the mechanical properties of the resulting polymer.

S12, pouring the cladding polymer solution into a Teflon tube mold (shown in fig. 5, a Teflon tube with a Teflon rod at the center), then putting into an oven for prepolymerization at 80 ℃ for 30-90 min, taking out and cooling after the solution becomes viscous.

S13, cooling to room temperature, putting the mixture into an oven again for polymerization, starting the polymerization temperature from 50 ℃, increasing the temperature to 80 ℃ gradually every 12 hours according to a change gradient of 50-55-60-65-70-75-80 ℃, increasing the temperature to 80 ℃ gradually until the solution is hardened, then completing the polymerization to form a polymer preform, taking the polymer preform out of a Teflon tube, and pulling out the Teflon rod to obtain a hollow polymer preform, namely forming the cladding structure of the plastic scintillating fiber.

S2, preparing a doped polymer preform:

s21, taking a polymer monomer solution, adding 0.1-0.5% of initiator, 0.1-0.5% of de chain transfer agent and 0.5-5% of rare earth europium beta-diketone complex into the polymer monomer solution, and fully stirring by ultrasonic waves to obtain a core polymer solution, wherein:

The type of the initiator can be selected by referring to the type of the initiator in the step S11;

the chain transfer agent type selection can refer to the chain transfer agent type selection in the step S11;

the beta-diketone complex of rare earth europium is prepared by the method.

S22, pouring the core polymer solution into the hollow polymer preform prepared in the step S1, sealing the hollow polymer preform (by heating a port of the hollow polymer preform, cooling and solidifying after melting to seal the core polymer solution), then placing the hollow polymer preform into an oven to perform prepolymerization at 80 ℃ for 30-90 min, taking out and cooling after the solution becomes viscous;

s23, cooling to room temperature, putting into an oven again for polymerization, starting at 50-70 ℃, increasing the polymerization temperature to 5 ℃ every 12 hours, gradually increasing to 80-100 ℃ until the solution is hardened, and forming a doped polymer preform (shown in figure 6) after the polymerization is completed, namely forming a core layer structure in the cladding structure of the plastic scintillation optical fiber;

s3, drawing the polymer optical fiber:

and (3) placing the doped polymer preform into a drawing tower to heat the doped polymer preform, wherein the temperature of the drawing tower is set to 140-240 ℃, the heating time is 1-3 hours, and after the doped polymer preform is softened, the preform is put down and pulled, the lower rod speed of the drawing tower is 0.5-3mm/min, the pulling speed is 0.2-1.5m/min, and the polymer optical fiber with the diameter of 200-1000 mu m is drawn, so that the plastic scintillating optical fiber is prepared (shown in figure 7).

In order to further improve the performance of the plastic scintillation optical fiber, a coating layer can be added on the surface of the optical fiber in the drawing process of the optical fiber, and a layer of different materials can be coated according to different purposes, environments and application fields, so that the surface of the optical fiber can be protected from being damaged, the mechanical strength of the optical fiber can be improved, and the attenuation can be reduced. The cladding formed in step S1 is protected by a coating layer, so that the cladding of the optical fiber is actually a multi-layer structure including an outer cladding formed of the coating layer and an inner cladding formed of a polymer. In order to further improve the performance of the optical fiber, a plurality of coating layers can be designed according to the use requirement so as to realize different functions.

In connection with the above embodiments, specific selection of materials is made, and specific examples are given:

example 1

Using absolute ethyl alcohol as solvent, mixing EuCl ₃ ·6H ₂ O, TTA, TPPO to obtain EuCl with a certain concentration at a molar mass ratio of 1:3:2 ₃ ·6H ₂ O ethanol solution, TTA ethanol solution, TPPO ethanol solution. Four-mouth flask equipped with stirrer, spherical condenser tube, constant pressure dropping funnel and thermometerAdding the prepared EuCl ₃ ·6H ₂ Ethanol solution of O. Stirred toward EuCl ₃ ·6H ₂ Dropwise adding TTA ethanol solution into O ethanol solution, adjusting pH to 6.0-6.5 with sodium hydroxide aqueous solution, and heating in water bath. The water bath temperature was maintained at 60℃for 30 minutes. Then the prepared TPPO ethanol solution is added into the stock solution in a dropwise manner, the temperature is maintained at 60 ℃, and the mixture is stirred for 5 hours under reflux. After the reaction is finished, filtering to obtain a crude product, washing the crude product with ethanol for three times, and drying to obtain Eu (TTA) ₃ TPPO ₂ A complex.

Mixing MMA and BA according to the mass part ratio of 80:20, simultaneously adding lauroyl peroxide and n-butanol accounting for 0.22% and 0.18% of the total mass of the MMA and BA, filling into a custom-made mould (a Teflon tube with a Teflon rod at the center), and heating by a baking oven to polymerize the monomers, wherein the polymerization process is as follows: the mold was placed in an oven and prepolymerized at 80℃for 40min, and after the solution became viscous, it was removed and cooled. Cooling to room temperature, putting into an oven again for polymerization, starting at 50 ℃, increasing the temperature to 80 ℃ gradually every 12 hours according to the gradient of the change of 50-55-60-65-70-75-80 ℃, gradually increasing the temperature to 5 ℃ until the solution is hardened, and demoulding to form the hollow polymer preform (cladding preform) with a cavity in the middle.

Mixing MMA and BA according to a mass fraction ratio of 85:15, simultaneously adding lauroyl peroxide and n-butanol accounting for 0.22% and 0.18% of the total mass of MMA and BA respectively, and adding Eu (TTA) accounting for 4% of the total mass of MMA and BA ₃ TPPO ₂ The complex is poured into a cladding preform, sealing is carried out, the polymerization process of the first step is repeated, namely the cladding preform is put into an oven, prepolymerization is carried out at 80 ℃ for 40min, and the solution is taken out and cooled after becoming viscous. Cooling to room temperature, placing into an oven again for polymerization, starting at 50 ℃, increasing 5 ℃ every 12 hours according to the gradient of the change of 50-55-60-65-70-75-80 ℃ and gradually increasing to 80 ℃ until the solution is hardened, and finally forming the complete product A preform.

The lower rod speed and the wire discharge speed of the wire drawing tower are reasonably controlled by using the wire drawing tower at a certain temperature, and the optical fiber with a proper size is drawn, specifically: and (3) placing the preform into a drawing tower to heat the preform, wherein the temperature of the drawing tower is set to 180 ℃, the heating time is 2 hours, and after the doped polymer preform begins to soften, the preform is put down and pulled, the lower rod speed of the drawing tower is 1.0mm/min, the pulling speed is 0.8m/min, and the polymer optical fiber with the diameter of 300 mu m is drawn, so that the plastic scintillating optical fiber is prepared.

Example 2

Using absolute ethyl alcohol as solvent, mixing EuCl ₃ ·6H ₂ O, DBM, phen to obtain EuCl with a certain concentration at a molar mass ratio of 1:3:1 ₃ ·6H ₂ O ethanol solution, TTA ethanol solution and Phen ethanol solution. Adding EuCl prepared in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer ₃ ·6H ₂ O ethanol solution. Stirred toward EuCl ₃ ·6H ₂ Dripping DBM ethanol solution into the O ethanol solution, adjusting the pH to 6.0-6.5 with sodium hydroxide aqueous solution, and heating in water bath. The water bath temperature was maintained at 60℃for 30 minutes. And then the prepared Phen ethanol solution is added into the stock solution in a dropwise manner, the temperature is maintained at 60 ℃, and the mixture is stirred for 5 hours under reflux. After the reaction is finished, filtering to obtain a crude product, washing the crude product with ethanol for three times, and drying to obtain Eu (DBM) ₃ Phen complexes.

Mixing MMA and BA according to the mass part ratio of 75:25, simultaneously adding lauroyl peroxide and n-butanol accounting for 0.4% and 0.2% of the total mass of the MMA and BA, filling into a custom-made mould (a Teflon tube with a Teflon rod at the center), and heating by a baking oven to polymerize the monomers, wherein the polymerization process is as follows: the mold was placed in an oven and prepolymerized at 80℃for 50min, and after the solution became viscous, it was removed and cooled. Cooling to room temperature, putting into an oven again for polymerization, starting at 50 ℃, increasing the temperature to 80 ℃ gradually every 12 hours according to the gradient of the change of 50-55-60-65-70-75-80 ℃, gradually increasing the temperature to 5 ℃ until the solution is hardened, and demoulding to form the hollow polymer preform (cladding preform) with a cavity in the middle.

Mixing MMA and BA at a mass fraction of 80:20, simultaneously adding lauroyl peroxide and n-butanol which account for 0.4% and 0.2% of the total mass of MMA and BA, respectively, and adding Eu (DBM) which accounts for 5% of the total mass of MMA and BA ₃ Phen complex is poured into the cladding preform, sealing is carried out, the polymerization process of the first step is repeated, namely the cladding preform is put into an oven, prepolymerization is carried out at 80 ℃ for 50min, and the solution is taken out and cooled after becoming viscous. Cooling to room temperature, putting into an oven again for polymerization, wherein the polymerization temperature is from 50 ℃, the temperature is increased to 80 ℃ gradually every 12 hours according to the gradient of the change of 50-55-60-65-70-75-80 ℃, and the polymerization is completed after the solution is hardened, so that the complete preform is finally formed.

The lower rod speed and the wire discharge speed of the wire drawing tower are reasonably controlled by using the wire drawing tower at a certain temperature, and the optical fiber with a proper size is drawn, specifically: and (3) placing the preform into a drawing tower to heat the preform, wherein the temperature of the drawing tower is set to 180 ℃, the heating time is 2 hours, and after the doped polymer preform begins to soften, the preform is put down and pulled, the lower rod speed of the drawing tower is 1.5mm/min, the pulling speed is 0.6m/min, and the polymer optical fiber with the diameter of 500 mu m is drawn, so that the plastic scintillating optical fiber is prepared.

Example 3

Using absolute ethyl alcohol as solvent, mixing EuCl ₃ ·6H ₂ O, TTA, phen to obtain EuCl with a certain concentration at a molar mass ratio of 1:3:1 ₃ ·6H ₂ O ethanol solution, TTA ethanol solution and Phen ethanol solution. Adding EuCl prepared in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer ₃ ·6H ₂ O ethanol solution. Stirred toward EuCl ₃ ·6H ₂ Dropwise adding ethanol solution of TTA into O ethanol solution, adjusting pH to 6.0-6.5 with sodium hydroxide aqueous solution, and heating in water bath. The water bath temperature was maintained at 60℃for 30 minutes. Dripping Phen ethanol solution into the original solutionThe solution was maintained at 60℃and stirred at reflux for 5 hours. After the reaction is finished, filtering to obtain a crude product, washing the crude product with ethanol for three times, and drying to obtain Eu (TTA) ₃ Phen complexes.

Mixing MMA and BA at a mass ratio of 50:50, adding lauroyl peroxide and n-butanol with mass fractions of 0.5% and 0.2% of total mass of MMA and BA respectively, and pouring into a custom mold (Teflon tube with Teflon rod at its center). The monomers are polymerized by heating in an oven, and the polymerization process is as follows: the mold was placed in an oven and prepolymerized at 80℃for 45min, and after the solution became viscous, it was removed and cooled. Cooling to room temperature, putting into an oven again for polymerization, starting at 50 ℃, increasing the temperature to 80 ℃ gradually every 12 hours according to the gradient of the change of 50-55-60-65-70-75-80 ℃, gradually increasing the temperature to 5 ℃ until the solution is hardened, and demoulding to form the hollow polymer preform (cladding preform) with a cavity in the middle.

Mixing MMA and BA at a mass ratio of 60:40, adding lauroyl peroxide and n-butanol at a mass ratio of 0.5% and 0.2% respectively, and adding Eu (TTA) at a mass ratio of 3% based on the total mass of MMA and BA ₃ Phen complex is poured into the cladding preform, sealing is carried out, the polymerization process of the first step is repeated, namely, the cladding preform is put into an oven, prepolymerization is carried out at the temperature of 80 ℃, the polymerization time is 45min, and the cladding preform is taken out and cooled after the solution becomes viscous. Cooling to room temperature, putting into an oven again for polymerization, wherein the polymerization temperature is from 50 ℃, the temperature is increased to 80 ℃ gradually every 12 hours according to the gradient of the change of 50-55-60-65-70-75-80 ℃, and the polymerization is completed after the solution is hardened, so that the complete preform is finally formed.

The lower rod speed and the wire discharge speed of the wire drawing tower are reasonably controlled by using the wire drawing tower at a certain temperature, and the optical fiber with a proper size is drawn, specifically: and (3) placing the preform into a drawing tower to heat the preform, wherein the temperature of the drawing tower is set to 180 ℃, the heating time is 2 hours, and after the doped polymer preform begins to soften, the preform is put down and pulled, the lower rod speed of the drawing tower is 2mm/min, the pulling speed is 0.4m/min, and the polymer optical fiber with the diameter of 700 mu m is drawn, so that the plastic scintillating optical fiber is prepared.

Example 4

Using absolute ethyl alcohol as solvent, mixing EuCl ₃ ·6H ₂ O, BZA, phen to obtain EuCl with a certain concentration at a molar mass ratio of 1:3:1 ₃ ·6H ₂ O ethanol solution, BZA ethanol solution, phen ethanol solution. Adding EuCl prepared in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer ₃ ·6H ₂ O ethanol solution. Stirred toward EuCl ₃ ·6H ₂ Adding ethanol solution of BZA into O ethanol solution, adjusting pH to 6.0-6.5 with sodium hydroxide aqueous solution, and heating in water bath. The water bath temperature was maintained at 60℃for 30 minutes. And (3) dropwise adding the prepared Phen ethanol solution into the stock solution, maintaining the temperature at 60 ℃, and refluxing and stirring for 5 hours. After the reaction is finished, filtering to obtain a crude product, washing the crude product with ethanol for three times, and drying to obtain Eu (BZA) ₃ Phen complexes.

Taking SM (styrene), simultaneously adding lauroyl peroxide and n-butanol with the mass fractions of 0.3% and 0.1% of the total mass of the SM respectively, filling into a custom-made mould (a Teflon tube with a Teflon rod in the center), and heating by an oven to polymerize monomers, wherein the polymerization process is as follows: the mold was placed in an oven and prepolymerized at 80℃for 45min, and after the solution became viscous, it was removed and cooled. Cooling to room temperature, putting into an oven again for polymerization, starting at 70 ℃, increasing the temperature to 100 ℃ gradually every 12 hours according to the gradient of the change of 70-75-80-85-90-95-100 ℃, gradually increasing the temperature to 5 ℃ until the solution is hardened, and demoulding to form the hollow polymer preform (cladding preform) with a cavity in the middle.

Taking SM, adding lauroyl peroxide and n-butanol accounting for 0.3% and 0.1% of the total mass of the SM simultaneously, and adding Eu (BZA) accounting for 2% of the total mass of the SM ₃ Phen complex is poured into the cladding preform, sealing is carried out, and the polymerization of the first step is repeatedThe process comprises the steps of putting the cladding preform into an oven, carrying out prepolymerization at 80 ℃ for 45min, taking out the solution after the solution becomes viscous, and cooling. Cooling to room temperature, putting into an oven again for polymerization, wherein the polymerization temperature is from 70 ℃, and increasing 5 ℃ to 100 ℃ every 12 hours according to the gradient of the change of 70 ℃ to 75 ℃ to 80 ℃ to 85 ℃ to 90 ℃ to 95 ℃ to 100 ℃ until the solution is hardened, and finally forming the complete preform.

The lower rod speed and the wire discharge speed of the wire drawing tower are reasonably controlled by using the wire drawing tower at a certain temperature, and the optical fiber with a proper size is drawn, specifically: and (3) placing the preform into a drawing tower to heat the preform, wherein the temperature of the drawing tower is set to be 200 ℃, the heating time is 2 hours, and after the doped polymer preform begins to soften, the preform is put down and pulled, the lower rod speed of the drawing tower is 2.5mm/min, the pulling speed is 0.2m/min, and the polymer optical fiber with the diameter of 900 mu m is drawn, so that the plastic scintillating optical fiber is prepared.

Example 5

Using absolute ethyl alcohol as solvent, mixing EuCl ₃ ·6H ₂ O, AA, TPPO to obtain EuCl with a certain concentration at a molar mass ratio of 1:3:2 ₃ ·6H ₂ O ethanol solution, AA ethanol solution, TPPO ethanol solution. Adding EuCl prepared in a four-neck flask equipped with a stirrer, a spherical condenser, a constant pressure dropping funnel and a thermometer ₃ ·6H ₂ O ethanol solution. Stirred toward EuCl ₃ ·6H ₂ The ethanol solution of AA is added dropwise to the O ethanol solution, the pH is adjusted to about 6.0 with an aqueous solution of sodium hydroxide, and water bath heating is performed. The water bath temperature was maintained at 60℃for 30 minutes. And (3) dropwise adding the prepared TPPO ethanol solution into the stock solution, maintaining the temperature at 60 ℃, and refluxing and stirring for 5 hours. After the reaction is finished, filtering to obtain a crude product, washing the crude product with ethanol for three times, and drying to obtain Eu (AA) ₃ TPPO ₂ A complex.

Taking 3FMA (2, 2-trifluoro ethyl methacrylate), simultaneously adding 0.25% and 0.15% of lauroyl peroxide and n-butanol by mass percent of the total mass of the 3FMA, filling into a custom-made mould (Teflon tube with Teflon rod at the center), and heating by a baking oven to polymerize the monomer, wherein the polymerization process is as follows: the mold was placed in an oven and prepolymerized at 80℃for 45min, and after the solution became viscous, it was removed and cooled. Cooling to room temperature, putting into an oven again for polymerization, starting at 60 ℃, increasing the temperature to 90 ℃ gradually every 12 hours according to the gradient of 60-65-70-75-80-85-90 ℃ and increasing the temperature to 5 ℃ gradually until the solution is hardened, and demoulding to form the hollow polymer preform (cladding preform) with a cavity in the middle.

Taking 3FMA, simultaneously adding lauroyl peroxide and n-butanol accounting for 0.3% and 0.1% of the total mass of the 3FMA, adding Eu (AA) 3TPPO2 complex accounting for 1% of the total mass of the 3FMA, filling the mixture into a cladding preform, sealing, and repeating the polymerization process of the first step, wherein the polymerization process is as follows: the clad preform was put into an oven, prepolymerized at 80℃for 45min, and taken out and cooled after the solution became viscous. Cooling to room temperature, putting into an oven again for polymerization, wherein the polymerization temperature is from 60 ℃, the temperature is increased to 90 ℃ gradually every 12 hours according to the gradient of 60-65-70-75-80-85-90 ℃, and the polymerization is completed after the solution is hardened, so that the complete preform is finally formed.

The lower rod speed and the wire discharge speed of the wire drawing tower are reasonably controlled by using the wire drawing tower at a certain temperature, and the optical fiber with a proper size is drawn, specifically: and (3) placing the preform into a drawing tower to heat the preform, wherein the temperature of the drawing tower is set to 160 ℃, the heating time is 2 hours, and after the doped polymer preform begins to soften, the preform is put down and pulled, the lower rod speed of the drawing tower is 2mm/min, the pulling speed is 0.4m/min, and the polymer optical fiber with the diameter of 700 mu m is drawn, so that the plastic scintillating optical fiber is prepared.

The plastic scintillating fiber prepared in example 1 was selected to perform performance verification for the technical scheme of the invention:

the optical fiber obtained in example 1 was prepared as Eu (TTA) ₃ TPPO ₂ (ETT for short) is a scintillator, and specific performance tests are carried out on the scintillator, and the test results are as follows:

as shown in fig. 8, which is a graph comparing the luminous intensity of the plastic scintillating fiber (expressed as 4wt% ett in fig. 8) with that of BGO crystal, it can be seen from the graph: the light-emitting intensity of the scintillation fiber is comparable to that of BGO crystals commonly used in the market by testing under the same condition, and the high light-emitting property of the scintillation fiber is fully proved. In addition, the plastic scintillation fiber mainly emits light at 613nm, the half-width of the plastic scintillation fiber is only 8.9nm, and the plastic scintillation fiber has a very small emission peak compared with other scintillators (especially BGO), which means that when the luminescent signal of the scintillator is taken as the detected signal, only a small detection range is needed, and the detection cost can be reduced.

As shown in fig. 9. The luminous intensity change graph of the plastic scintillating fiber under the irradiation of X-rays for one hour shows that the luminous intensity of the plastic scintillating fiber is basically unchanged under the irradiation of X-rays for up to one hour, the radiation stability is excellent, and the manufactured scintillating fiber is fully proved to have high stability. Meanwhile, in order to further test the stability of the plastic scintillating fiber, the plastic scintillating fiber was subjected to a radiation luminescence measurement after being stored in air for 3 months, and as shown in fig. 10, the RL intensity of Eu-PSF was not substantially attenuated, indicating that the material was not degraded.

As shown in FIG. 11, the rare earth complex Eu (TTA) ₃ TPPO ₂ And an excitation spectrum. As can be seen from the figure, eu (TTA) ₃ TPPO ₂ Has a larger absorption band below 500nm and a maximum absorption peak at 409 nm. Eu (TTA) ₃ TPPO ₂ Has a smaller emission band, and an emission peak appears after 575nm, wherein the maximum emission peak is 613nm. This indicates Eu (TTA) ₃ TPPO ₂ Has a maximum Stokes shift of up to 104nm between the maximum absorption peak 409nm and the maximum emission peak 613nm. A large Stokes shift between excitation and absorption spectra indicates Eu (TTA) ₃ TPPO ₂ No re-absorption occurs and light can travel farther in the scintillating fiber.

Therefore, the plastic scintillating fiber prepared by the invention has the characteristics of high luminescence and high stability, and the transmission loss of visible light in the fiber is small, so that the plastic scintillating fiber is very suitable for being used as a sensing unit to be applied to an X-ray imaging system.

Then, the plastic scintillation fiber array imaging sensor is manufactured by using the plastic scintillation fiber and is applied to an X-ray imaging system, and the specific scheme is as follows:

as shown in fig. 12, a plastic scintillation fiber array imaging sensor is formed by arranging a certain length of plastic scintillation fiber 201 into a two-dimensional array along a direction parallel to a detected ray, two flat surfaces of the plastic scintillation fiber array are ground, a high-reflection film is plated on the peripheral ring surface of the plastic scintillation fiber and the end surface for receiving the detected ray, and crosstalk and light loss between the fibers are reduced through the high-reflection film. During actual manufacturing, the plastic mold 202 can be manufactured by combining a 3D printing technology, then the plastic scintillating fibers 201 are arranged in the mold 202 according to requirements, so that a two-dimensional array structure is formed, the fiber array structure is stable and firm, the application is convenient, and high-resolution and long-distance imaging can be realized. In practical application, the shape of the plastic mould can be specifically designed according to imaging requirements, so that the scintillation optical fibers are arranged in different array forms, and the scintillation optical fibers can be repeatedly used in different plastic moulds.

As shown in fig. 13, a physical effect diagram of the plastic scintillation fiber array imaging sensor is formed by orderly stacking optical fibers with a diameter of 600 μm and a length of 5cm in a 3D printed plastic mold with a length of 1.2cm by 1.2 cm.

By adopting the plastic scintillating fiber array imaging sensor, an X-ray imaging system is constructed, as shown in fig. 14, and specifically comprises: the X-ray source 301, the scintillation fiber array imaging sensor 303, the reflecting unit 304 and the CCD camera 305, the X-ray source 1 emits X-rays, the X-rays pass through the measured object 302, the scintillation fiber array imaging sensor 303 absorbs the X-rays which pass through the measured object 302 and emits scintillation light, and the scintillation light is received by the CCD camera 305 after being reflected by the reflecting unit 304.

The imaging system works in the following principle: the X-ray source emits rays which pass through the object to be measured and are absorbed by the rear optical fiber array, and as the X-rays pass through the object, a part of the rays can be absorbed, so that the quantity of the X-rays passing through the object is different from that of the surrounding environment, the scintillation optical fiber array absorbs different ray energy and emits light with different intensities, thereby forming an image of the object to be measured, wherein the light path is adjusted by the reflecting mirror and is received by the high-sensitivity CCD camera, and the interference and influence of the X-rays on the CCD camera can be avoided. The optical image received by the CCD camera can be finally converted into a video signal through a computer to be output and checked.

The imaging system has simple structure and high sensitivity, can realize high-resolution and long-distance imaging, and can avoid damage of high-energy rays to electronic instruments.

Wherein:

1. the X-ray source can adopt an X-ray crystal analyzer of Dandong access limited company, and the maximum current is 30mA and the maximum voltage is 40KV;

2. the reflecting unit may be constituted by the simplest reflecting mirror, or other reflecting structures may be adopted as long as it can ensure that the scintillation light is received by the CCD camera and is not disturbed by the X-rays.

3. The CCD camera is preferably a large-aperture high-sensitivity CCD camera.

According to the scheme, a specific experiment is carried out, and the actual measurement is carried out on the object, specifically as follows:

1. measuring a screw about 1cm long

The test conditions were as follows:

(1) The X-ray source adopts an X-ray crystal analyzer of Dandong access limited company, the current is set to be 30mA, and the voltage is set to be 30KV;

(2) The scintillation fiber array imaging sensor is manufactured by orderly stacking plastic scintillation fibers with the length of 5cm and the diameter of 600 mu m in a 3D printing mould with the length of 1.2cm and the diameter of 1.2 cm;

(3) The CCD camera adopts a 2600 ten thousand-pixel large-aperture Risingcam camera.

A graph of the measured imaging effect versus the real object, as shown in FIG. 15

2. Measuring an iron ring with a diameter of about 1cm

The test conditions were as follows:

(1) The X-ray source adopts an X-ray crystal analyzer of Dandong access limited company, the current is set to 20mA, and the voltage is set to 30KV;

(2) The scintillation fiber array imaging sensor is manufactured by orderly stacking plastic scintillation fibers with the length of 10cm and the diameter of about 800 mu m in a 3D printing mould with the length of 1.2cm and the diameter of 1.2 cm;

A comparison of the measured imaging effect with the real object is shown in fig. 16.

In summary, the invention has the following advantages:

1. the preparation method of the rare earth europium beta-diketone complex is simple to operate and convenient to implement;

2 the plastic scintillating fiber has good transparency, high light-emitting property and high stability;

3. the preparation method of the plastic scintillating fiber has simple operation, low production cost and convenient implementation, and can be popularized and applied on a large scale.

4. The plastic scintillating fiber array imaging sensor has simple structure and low manufacturing cost, can realize high-resolution and long-distance imaging, and can avoid damage of high-energy rays to electronic instruments.

5. The X-ray imaging system has the advantages of high sensitivity and simple structure, can realize high-resolution and long-distance imaging, can avoid damage of high-energy rays to electronic instruments, and can be widely applied to real-time detection in various fields such as military, industrial nondestructive detection, biomedical engineering and the like.

It is to be understood that the foregoing detailed description of the invention is merely illustrative of the invention and is not limited to the embodiments of the invention. It will be understood by those of ordinary skill in the art that the present invention may be modified or substituted for elements thereof to achieve the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.

Claims

1. The imaging sensor is characterized by being formed by arranging plastic scintillating fibers with a certain length into a two-dimensional array along the direction parallel to the detected rays, wherein two ends of the plastic scintillating fiber array are two flat surfaces which are ground and smooth, the plastic scintillating fibers comprise a core layer and a cladding layer, the core layer contains beta-diketone complex of rare earth europium as a scintillator, and the refractive index of the core layer is higher than that of the cladding layer.

2. The plastic scintillating fiber array imaging sensor of claim 1, wherein the peripheral annulus of the plastic scintillating fiber and the end face receiving the detected radiation are coated with a highly reflective film.

3. The plastic scintillating fiber array imaging sensor of claim 1, further comprising a plastic mold in which the plastic scintillating fibers are arranged in parallel to form a two-dimensional array, the plastic mold being fabricated by 3D printing techniques.

4. The plastic scintillating fiber array imaging sensor of claim 1, wherein the substrate of the core layer is composed of a copolymer of methacrylate monomer and acrylate monomer or a homopolymer of aromatic monomer with vinyl group; the cladding is composed of a copolymer of methacrylate monomers and acrylate monomers or of a homopolymer of fluorinated monomers.

5. The plastic scintillating fiber array imaging sensor of claim 4, wherein the plastic scintillating fiber is prepared using a method comprising the steps of:

s101, preparing a hollow polymer preform:

S102, preparing a doped polymer preform:

s103, drawing a polymer optical fiber:

6. The plastic scintillating fiber array imaging sensor of claim 5, wherein in step S101:

adding an initiator with the mass fraction of 0.1-0.5% and a chain transfer agent with the mass fraction of 0.1-0.5% into a polymer monomer solution, wherein the initiator is a peroxide or azo compound, and the chain transfer agent is mercaptan;

The temperature during the pre-polymerization is 80 ℃ and the polymerization time is 30min-90min until the solution becomes viscous;

the polymerization is carried out at a temperature of from 50 to 70℃and at 5℃every 12 hours, gradually to 80 to 100℃until the solution hardens.

7. The plastic scintillating fiber array imaging sensor of claim 5, wherein in step S102:

adding an initiator with the mass fraction of 0.1-0.5%, a chain transfer agent with the mass fraction of 0.1-0.5% and a beta-diketone complex of rare earth europium with the mass fraction of 0.5-5% into a polymer monomer solution, wherein the initiator is a peroxide or azo compound, and the chain transfer agent is mercaptan;

8. The plastic scintillating fiber array imaging sensor of claim 5, wherein in step S103:

the temperature of the drawing tower is set to 140-240 ℃ and the heating time is 1-3 hours until the optical fiber preform rod begins to soften;

the lower rod speed of the drawing tower is 0.5-3mm/min, the traction speed is 0.2-1.5m/min, and the diameter of the drawn polymer optical fiber is 200-1000 mu m.

9. The plastic scintillating fiber array imaging sensor of claim 5, wherein the rare earth europium β -diketone complex is prepared using the following method, comprising the steps of:

s205, washing the crude product with absolute ethyl alcohol for three times, and drying to obtain the rare earth europium beta-diketone complex.

10. An X-ray imaging system based on a scintillation fiber array imaging sensor as claimed in any one of claims 1 to 9, comprising an X-ray source, a scintillation fiber array imaging sensor, a reflecting unit and a CCD camera, wherein the X-ray source emits X-rays, the X-rays pass through an object to be measured, the scintillation fiber array imaging sensor absorbs the X-rays passing through the object to be measured and emits scintillation light, and the scintillation light is received by the CCD camera after being reflected by the reflecting unit.