CN108489948B - U-shaped bidirectional optical fiber fluorescence radiation sensing probe - Google Patents
U-shaped bidirectional optical fiber fluorescence radiation sensing probe Download PDFInfo
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- CN108489948B CN108489948B CN201810244824.1A CN201810244824A CN108489948B CN 108489948 B CN108489948 B CN 108489948B CN 201810244824 A CN201810244824 A CN 201810244824A CN 108489948 B CN108489948 B CN 108489948B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
In order to solve the problems of low intensity, poor stability, high requirements on a signal detection device and the like of a fluorescence signal generated by embedding a fluorescent material into the existing micro hole, the invention designs a U-shaped bidirectional optical fiber fluorescence radiation sensing probe, which is characterized in that a groove is processed at the bottom of a specially manufactured U-shaped optical fiber, and the fluorescent material is filled in the groove or the fluorescent material is coated after a cladding layer at the bottom of the U-shaped optical fiber is removed; when the ray irradiates the position of the fluorescent material, the optical fiber conducts the fluorescence to two ends, and the optical fiber coupler couples the fluorescence signals at the two ends of the optical fiber to one optical fiber. Therefore, compared with a probe with a single optical fiber end face embedded or wrapped with a fluorescent material, the novel U-shaped bidirectional optical fiber fluorescent probe has the advantages of higher fluorescent signal intensity, better stability and stronger interference resistance, reduces the requirements on a signal detection device, and can be applied to the fields of various high-energy ray detection, such as radiotherapy, cosmic ray observation, nuclear leakage monitoring and the like.
Description
Technical Field
The invention belongs to the field of high-energy ray detection by using optical fiber sensing, and particularly relates to a U-shaped bidirectional optical fiber fluorescent radiation sensing probe.
Background
High-energy radiation is used in many areas of society today, including ultraviolet radiation, X-rays, gamma rays, and the like. Ultraviolet rays and X rays are discovered in succession in the 19 th century and the roentgen, high-energy rays are utilized in all aspects of our life, and ultraviolet rays are used for sterilization, X-ray diagnosis, tumor treatment and the like, but if the using amount of the high-energy rays cannot be controlled, the life of people is adversely affected and even the life of people is harmed. In the process of utilizing or shielding rays in hospitals, nuclear power stations and other places, the intensity of radiation needs to be detected, and the double-edged sword can only bring benefits to human beings but not hurt people by using the rays in a quantitative and controllable manner.
The fluorescent optical fiber sensor transmits a fluorescent signal by taking an optical fiber as a conduction means. The method has the characteristics of high sensitivity and selectivity of a fluorescence method, strong electromagnetic interference resistance of the optical fiber, low transmission loss of the obtained optical information, large transmission capacity, no need of a reference device, simple and convenient manufacture of the optical fiber probe, easy miniaturization, real-time online performance and the like. When the exciting light is transmitted in the optical fiber in a total reflection mode and reaches the fluorescent reagent phase or the sensitive film, the detector detects the fluorescent signal to realize the quantitative analysis of the object to be detected. The measured fluorescence signal can be fluorescence quenching or fluorescence enhancement; fluorescence lifetime can be measured, as can fluorescence energy conversion. Fluorescence-quenched fluorescent fiber sensors are the most abundant of these types of sensors. Molecular oxygen, halogen ions, heavy metal ions, nitro compounds, etc. all cause fluorescence quenching, the degree of quenching being related to the quencher concentration. When the measurement is carried out in a homogeneous system, the relation between the fluorescence intensity and the concentration of the analyte follows the Stern-volmer equation, and when the measurement is carried out in a heterogeneous system, the Stern-volmer linearity deviates. The measurement is carried out by utilizing the fluorescence energy transfer efficiency, the absorption spectrum of one molecule is overlapped with the fluorescence emission spectrum of another molecule to a certain degree, and through the dipole interaction, the latter is that the excitation state energy of the donor is transferred to the former, namely the acceptor, and is released in a fluorescence form, so that the Stokes displacement is enlarged, the separation of the excitation light and the fluorescence is facilitated, and the sensitivity is improved. The fluorescence energy transfer is related to the non-radiative decay of the excited molecules of the donor, and the fluorescence lifetime of the donor is shortened, and the measurement can be carried out according to the shortened fluorescence lifetime. The optical fiber fluorescence radiation sensing probe is a probe manufactured by utilizing the principle that certain special materials are irradiated by high-energy rays to excite fluorescence in a visible light wave band, and the special materials are combined with the optical fiber, so that the fluorescence can be conducted in the optical fiber and further received by a light intensity detector. Taking the existing embedded radiation dose detection optical fiber probe as an example, namely 'embedded radiation dose detection optical fiber probe in tumor X-ray radiotherapy' with Chinese patent application number of 2015101663730, the technical scheme of the probe is that a fluorescent material is embedded in one end face of an optical fiber, but partial fluorescent signals are lost, so that the obtained fluorescent signals are weak, and the detection of a light intensity detector is not facilitated. In order to obtain a stronger fluorescence signal, the invention designs the probe which embeds the fluorescence material into the middle section of a section of optical fiber and transmits the fluorescence signal to the two ends of the optical fiber, so that the transmitted fluorescence signal has higher intensity and is more stable, and the high-energy ray measured by the optical fiber fluorescence radiation sensing probe is more reliable.
Disclosure of Invention
The invention aims to convert high-energy rays into fluorescence for detection by using a U-shaped bidirectional optical fiber fluorescence radiation sensing probe.
A U-shaped bidirectional optical fiber fluorescence radiation sensing probe is characterized in that the sensing probe consists of a signal detection end and a signal coupling end, and specifically comprises a U-shaped optical fiber 1-1 with a special structure and made of fluorescent materials, a fixing ring 1-2, an optical fiber sleeve 1-3, an optical fiber coupler 1-4, an output optical fiber 1-5 and a detector; the U-shaped optical fiber is a U-shaped optical fiber with a special structure and provided with fluorescent materials, the U-shaped optical fiber 1-1 with the special structure and provided with the fluorescent materials is connected with the fixing ring 1-2 to form a signal detection end, the optical fiber coupler is connected with the output optical fiber to form a signal coupling end, and the signal detection end and the signal coupling end jointly form a U-shaped bidirectional optical fiber fluorescent radiation sensing probe 4-2; the ray 4-1 irradiates on the optical fiber at the signal detection end, the U-shaped bidirectional optical fiber fluorescence radiation sensing probe 4-2 is connected with the detector 4-3 through the signal output optical fiber, and the detector is connected with the computer 4-4 through the data transmission line.
The U-shaped optical fiber with the fluorescent material and the special structure specifically comprises: the U-shaped optical fiber 1-1 with the special structure of the fluorescent material adopts a U-shaped optical fiber with an embedded detection end structure or a U-shaped optical fiber with a coating type detection end structure.
The U-shaped optical fiber with the embedded detection end structure specifically comprises: the embedded detection end structure is positioned in the middle section of the bottom of the U-shaped optical fiber, a naked optical fiber with a coating layer and a cladding removed in the middle section of the detection end of the bottom of the U-shaped optical fiber is provided with a cut groove 2-2, and a fluorescent material is filled in the groove 2-2 to fill up a gap; the middle section bare optical fiber 2-1 is wrapped with a coating layer, and two ends of the middle section bare optical fiber are provided with fixing rings 1-2.
The U-shaped optical fiber with the coating type detection end structure specifically comprises: the coating type detection end structure is located in the middle section of the bottom of the U-shaped optical fiber, a layer of fluorescent material 3-2 wraps the bare optical fiber with the coating layer and the cladding removed in the middle section of the detection end of the bottom of the U-shaped optical fiber, the coating layer wraps the bare optical fiber 3-1 in the middle section, and fixing rings 1-2 are installed at two ends of the bare optical fiber 3-1.
The U-shaped optical fiber with the coating type detection end structure or the U-shaped optical fiber with the embedded type detection end structure is sleeved in the optical fiber sleeve 1-3, the optical fiber sleeve 1-3 at two ends of the U-shaped optical fiber is connected with the optical fiber coupler 1-4, and the other end of the optical fiber coupler 1-4 is connected with the transmission optical fiber 1-5.
The fluorescent material 2-2 is an inorganic fluorescent scintillating material or an organic fluorescent scintillating material.
The ray 4-1 is high-energy ray and irradiates the fluorescence carrying region of the U-shaped optical fiber with the special structure and the fluorescent material.
Compared with the prior art, the invention has the advantages that: the optical fiber fluorescence radiation sensing probe has higher efficiency of converting high-energy rays into fluorescence signals, and more fluorescence energy excited by the high-energy rays in the filled fluorescent material can be transmitted in the optical fiber. The traditional optical fiber fluorescence radiation sensing probe can only conduct fluorescence excited by fluorescent materials in a single direction, so that a larger part of fluorescence cannot be effectively transmitted to the light intensity detector in the optical fiber. Therefore, compared with the traditional optical fiber fluorescent radiation sensing probe, the U-shaped bidirectional optical fiber fluorescent radiation sensing probe has lower requirements on the light intensity detector and has better anti-interference capability and stability.
Drawings
FIG. 1 is a top view of a U-shaped bidirectional fiber fluorescence radiation sensing probe;
FIG. 2 is a cross-sectional view of a signal detection end optical fiber of an embedded U-shaped bidirectional optical fiber fluorescence radiation sensing probe;
FIG. 3 is a cross-sectional view of a signal detection end optical fiber of a surface-coated U-shaped bidirectional optical fiber fluorescence radiation sensing probe;
FIG. 4 is a diagram of a measurement system with a U-shaped bidirectional fiber fluorescence radiation sensing probe.
Detailed description of the invention
The invention is described in detail below with reference to the accompanying drawings:
the sensing probe comprises a signal detection end and a signal coupling end, and specifically comprises a U-shaped optical fiber 1-1 with a special structure and made of fluorescent materials, a fixing ring 1-2, an optical fiber sleeve 1-3, an optical fiber coupler 1-4, an output optical fiber 1-5 and a detector; the U-shaped optical fiber is a U-shaped optical fiber with a special structure and provided with fluorescent materials, the U-shaped optical fiber 1-1 with the special structure and provided with the fluorescent materials is connected with the fixing ring 1-2 to form a signal detection end, the optical fiber coupler is connected with the output optical fiber to form a signal coupling end, and the signal detection end and the signal coupling end jointly form a U-shaped bidirectional optical fiber fluorescent radiation sensing probe 4-2; the ray 4-1 irradiates on the optical fiber at the signal detection end, the U-shaped bidirectional optical fiber fluorescence radiation sensing probe 4-2 is connected with the detector 4-3 through the signal output optical fiber, and the detector is connected with the computer 4-4 through the data transmission line. The U-shaped optical fiber 1-1 with the special structure of the fluorescent material adopts a U-shaped optical fiber with an embedded detection end structure or a U-shaped optical fiber with a coating type detection end structure. The embedded detection end structure is positioned in the middle section of the bottom of the U-shaped optical fiber, a naked optical fiber with a coating layer and a cladding removed in the middle section of the detection end of the bottom of the U-shaped optical fiber is provided with a cut groove 2-2, and a fluorescent material is filled in the groove 2-2 to fill up a gap; the middle section bare optical fiber 2-1 is wrapped with a coating layer, and two ends of the middle section bare optical fiber are provided with fixing rings 1-2. The coating type detection end structure is located in the middle section of the bottom of the U-shaped optical fiber, a layer of fluorescent material 3-2 wraps the bare optical fiber with the coating layer and the cladding removed in the middle section of the detection end of the bottom of the U-shaped optical fiber, the coating layer wraps the bare optical fiber 3-1 in the middle section, and fixing rings 1-2 are installed at two ends of the bare optical fiber 3-1.
The U-shaped optical fiber with the coating type detection end structure or the U-shaped optical fiber with the embedded type detection end structure is sleeved in the optical fiber sleeve 1-3, the optical fiber sleeve 1-3 at two ends of the U-shaped optical fiber is connected with the optical fiber coupler 1-4, and the other end of the optical fiber coupler 1-4 is connected with the transmission optical fiber 1-5. The fluorescent material 2-2 is an inorganic fluorescent scintillating material or an organic fluorescent scintillating material. The ray 4-1 is high-energy ray and irradiates the fluorescence carrying region of the U-shaped optical fiber with the special structure and the fluorescent material.
As shown in FIG. 1, the optical fiber fluorescence radiation sensing probe of the present invention comprises a signal detecting end and a signal coupling end. The signal detection end is composed of an optical fiber section 1-1 filled with fluorescent materials and is connected to the signal coupling end through optical fibers at two ends. The signal coupling end is composed of an optical fiber coupler, and the coupler is connected with two ends of the optical fiber and the signal output optical fiber.
The signal detection end optical fiber can be processed into a U shape. The U-shaped bottom end is embedded with a proper amount of fluorescent material and receives high-energy rays to be detected, the optical fiber is wrapped with a coating layer, the coating layer can be penetrated by the high-energy rays and isolates external stray light, the signal detection end optical fiber is fixed with the optical fiber coupler 1-4 through the optical fiber sleeve 1-3 and protects the optical fiber, and in addition, the relative spatial position of the signal detection end optical fiber is fixed by the fixing ring 1-2. The fluorescence signal is transmitted from the position of the fluorescent material to two ends of the optical fiber, two ends of the optical fiber are connected to the optical fiber coupler, the other end of the optical fiber coupler is connected with the signal output optical fiber, and thus the excited fluorescence signal is transmitted to the detector through the signal output optical fiber.
The signal detection end of the invention can be manufactured into two structures, fig. 2 shows the signal detection end structure of the embedded U-shaped bidirectional optical fiber fluorescence radiation sensing probe, and fig. 3 shows the signal detection end structure of the surface coating type U-shaped bidirectional optical fiber fluorescence radiation sensing probe.
The embedded scheme comprises the following steps: processing a section of optical fiber into a U shape, cutting a groove at the bottom of the U shape, namely the optical fiber 1-1 at the signal detection end, filling a fluorescent material 2-2 and filling the gap. Surface-coated version: processing a section of optical fiber into a U shape, and wrapping a layer of fluorescent material 3-2 outside the U-shaped bottom, namely the optical fiber at the signal detection end; coating a coating layer 2-1 on the U-shaped optical fiber of the embedded scheme, coating a coating layer 3-1 on the U-shaped optical fiber of the surface coating scheme, installing a fixing ring 1-2, and finally integrally sleeving the U-shaped optical fiber 1-3 to form a signal detection end, wherein the other end of the optical fiber coupler 1-4 is connected with a signal output optical fiber 1-5 to form a signal coupling end; as shown in fig. 4, a measurement system diagram with a U-shaped bidirectional optical fiber fluorescence radiation sensing probe is shown, a ray 4-1 is irradiated on an optical fiber at a signal detection end, and two ends of the U-shaped optical fiber are connected with an optical fiber coupler to form a U-shaped bidirectional optical fiber fluorescence radiation sensing probe 4-2; the U-shaped bidirectional optical fiber fluorescent radiation sensing probe is connected with a detector 4-3 through a signal output optical fiber, and the detector is connected with a computer 4-4 through a data transmission line. When the ray irradiates the position of the fluorescent material, the optical fiber conducts the fluorescence to two ends, and the optical fiber coupler couples the fluorescence signals at the two ends of the optical fiber to one optical fiber. Therefore, compared with a probe embedded into or wrapped by a single optical fiber end face, the novel U-shaped bidirectional optical fiber fluorescent probe is higher in fluorescent signal intensity, better in stability and stronger in anti-interference capability, and the requirements for a signal detection device are reduced.
The system with the U-shaped bidirectional optical fiber fluorescent radiation sensing probe can be applied to various fields. In the field of radiotherapy, the detector can be a photometric module, the probes can replace detectors such as an ionization chamber and the like, and a plurality of probes are placed in solid water to prepare a morning check instrument for detecting the dose inside and outside the radiation field and for ensuring the daily quality of the radiotherapy instrument; in the astronomical field, the detector can be an astronomical CCD imaging system, a plurality of probe arrays convert high-energy cosmic rays into image information, and the size and distribution of the rays are judged by reading the image information; in the field of nuclear power, a plurality of probes are arranged in various environments needing radiation monitoring, all optical fibers are gathered to a detector end, and radiation intensity information of various environments can be known in real time through connection of the detector and a computer. In the aspect of processing nuclear leakage and nuclear pollution, a robot can be used for conveying a probe to a designated area for detection, the other end of the optical fiber is connected to the detector and is connected with a computer, so that personnel can be prevented from entering a dangerous area, and relevant personnel can realize radiation detection of the nuclear leakage area only by operating the computer outside the area.
Claims (1)
1. A U-shaped bidirectional optical fiber fluorescence radiation sensing probe is characterized in that the sensing probe consists of a signal detection end and a signal coupling end, and specifically comprises a U-shaped optical fiber with a fluorescent material and an embedded detection end structure or a U-shaped optical fiber (1-1) with a coating detection end structure, a fixing ring (1-2), an optical fiber sleeve (1-3), an optical fiber coupler (1-4), an output optical fiber (1-5) and a detector; the U-shaped optical fiber is a U-shaped optical fiber with a fluorescent material and adopting an embedded detection end structure or a U-shaped optical fiber with a coating detection end structure, the U-shaped optical fiber with the fluorescent material and adopting the embedded detection end structure or the U-shaped optical fiber (1-1) with the coating detection end structure is connected with a fixing ring (1-2) to form a signal detection end, an optical fiber coupler is connected with an output optical fiber to form a signal coupling end, and the signal detection end and the signal coupling end jointly form a U-shaped bidirectional optical fiber fluorescent radiation sensing probe (4-2); the ray (4-1) irradiates on the optical fiber at the signal detection end, the U-shaped bidirectional optical fiber fluorescence radiation sensing probe (4-2) is connected with the detector (4-3) through the signal output optical fiber, and the detector is connected with the computer (4-4) through the data transmission line;
the U-shaped optical fiber with the embedded detection end structure specifically comprises:
the embedded detection end structure is positioned in the middle section of the bottom of the U-shaped optical fiber, a naked optical fiber with a coating layer and a cladding removed in the middle section of the detection end of the bottom of the U-shaped optical fiber is provided with a cut groove (2-2), and the groove (2-2) is filled with a fluorescent material and is used for filling gaps; the middle section bare fiber (2-1) is wrapped with a coating layer, and two ends of the middle section bare fiber are provided with fixing rings (1-2);
the U-shaped optical fiber with the coating type detection end structure specifically comprises:
the coating type detection end structure is positioned in the middle section of the bottom of the U-shaped optical fiber, a layer of fluorescent material (3-2) is wrapped outside the bare fiber with the coating layer and the cladding removed from the middle section of the detection end of the bottom of the U-shaped optical fiber, the coating layer is wrapped outside the bare fiber (3-1) in the middle section, and fixing rings (1-2) are installed at two ends of the bare fiber;
the U-shaped optical fiber with the coating type detection end structure or the U-shaped optical fiber with the embedded type detection end structure is sleeved in an optical fiber sleeve (1-3), the optical fiber sleeves (1-3) at two ends of the U-shaped optical fiber are connected with an optical fiber coupler (1-4), and the other end of the optical fiber coupler (1-4) is connected with an output optical fiber (1-5);
the fluorescent material (3-2) is an inorganic fluorescent scintillating material or an organic fluorescent scintillating material;
the ray (4-1) is high-energy ray and irradiates on a fluorescence carrying region of the U-shaped optical fiber with the fluorescent material and the embedded detection end structure or the U-shaped optical fiber with the coating detection end structure.
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| CN110441810B (en) * | 2019-07-09 | 2023-05-12 | 哈尔滨工程大学 | Optical fiber radiation probe with bending loss compensation |
| CN112363198B (en) * | 2020-10-27 | 2022-08-02 | 苏州易奥秘光电科技有限公司 | Spherical bidirectional optical fiber sensing probe |
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| JPH0271122A (en) * | 1988-09-06 | 1990-03-09 | Seiko Instr Inc | Infrared image sensor |
| US4935631A (en) * | 1986-12-08 | 1990-06-19 | The General Electric Company, P.L.C. | Radiation meters |
| CN102103081A (en) * | 2009-12-16 | 2011-06-22 | 中国科学院大连化学物理研究所 | Optical fiber bundle fluorescent sensor |
| CN206114143U (en) * | 2016-08-23 | 2017-04-19 | 北京博大华电测控技术有限公司 | Built -in cable joint temperature optic fibre on -line monitoring sensor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4935631A (en) * | 1986-12-08 | 1990-06-19 | The General Electric Company, P.L.C. | Radiation meters |
| JPH0271122A (en) * | 1988-09-06 | 1990-03-09 | Seiko Instr Inc | Infrared image sensor |
| CN102103081A (en) * | 2009-12-16 | 2011-06-22 | 中国科学院大连化学物理研究所 | Optical fiber bundle fluorescent sensor |
| CN206114143U (en) * | 2016-08-23 | 2017-04-19 | 北京博大华电测控技术有限公司 | Built -in cable joint temperature optic fibre on -line monitoring sensor |
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