CN108535765A - A kind of radiation imaging apparatus and its implementation based on flash fiber - Google Patents
A kind of radiation imaging apparatus and its implementation based on flash fiber Download PDFInfo
- Publication number
- CN108535765A CN108535765A CN201810357008.1A CN201810357008A CN108535765A CN 108535765 A CN108535765 A CN 108535765A CN 201810357008 A CN201810357008 A CN 201810357008A CN 108535765 A CN108535765 A CN 108535765A
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- Prior art keywords
- fiber
- flash
- flash fiber
- multimode fibre
- radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/201—Measuring radiation intensity with scintillation detectors using scintillating fibres
Abstract
The invention discloses a kind of radiation imaging apparatus and its implementation based on flash fiber, which includes collimation radiation source, twinkle jamming, fiber coupler, multimode fibre, photoelectric converter, data processing module and computer etc. that horizontally and vertically grid type is placed side by side.The flash fiber that horizontally and vertically grid type is placed side by side forms radiation sensitive regions, under the collimated rays irradiation that radioactive source is sent out, the flash fiber of exposure transmits passage of scintillation light respectively both horizontally and vertically, photoelectric converter is transmitted to by multimode fibre by fiber coupler, transformed electric signal is handled by data processing module and is analyzed, and the image information that computer obtains exposure position is transmitted to.The present invention can control the size and spatial resolution of imaging region by adjusting the spacing of flash fiber that grid type is placed side by side, have many advantages, such as simple structure, imaging region it is freely adjustable, can remote control.
Description
Technical field
The present invention relates to radiographic imaging arts, and optical fiber sensing technology is especially applied to radiant image.The present invention combines
The radio-sensitisation properties of flash fiber design a kind of adjustable grid type radiation imaging apparatus in sensitizing range, can be used for medicine at
The fields such as picture, geology detecting.
Background technology
Flash fiber is a kind of special optical fiber, and the doping of the luminescent materials such as phosphor, scintillation crystal is generally used to be made,
With fast reaction and increase the characteristics such as spatial resolving power.In radiation field, flash fiber has both radiation sensing and optical signal
The double action of transmission.Ought there are high energy particle or X-ray, gamma-rays to be incident on flash fiber, doping body is made with high-energy ray
With energy level transition occurs, and then photon is inspired, the photon for meeting total reflection condition reaches photoelectricity by the transmission of flash fiber
Switching device.Flash fiber has many advantages, such as that compact-sized, to effectively improve detection efficient, resistance to radiation damage good, extensive
Applied to high energy particle and X-ray detection X and imaging field, and the more burning hot a kind of special optical fiber of research at present.
Radiant image is the important branch in radiation detection field, traditional radiation imaging apparatus using scintillation crystal block with it is glimmering
Tabula rasa constitutes radiation sensing and photosensitive unit.In general, scintillation crystal block is expensive, medicine radiant image and geology detecting
Equal fields usually require large volume of scintillation crystal block, thus the size critical constraints of radiant image.Further, such dress
It sets and faces the deliquescent problem of scintillation crystal in actual use, and scintillation crystal needs and photoelectric converter compact package exists
Together, it is easy by electromagnetic interference, it is difficult to ensure the stability to work long hours.
Another common radiation imaging apparatus, using scintillator-optical fiber combination formula radiation detection.Passage of scintillation light passes through optical fiber
It is transmitted to photomultiplier, solves the problems, such as traditional radiation imaging apparatus by electromagnetic interference, however since scintillator is sent out
Passage of scintillation light dissipated towards space all directions, it is believed that the coupling efficiency of isotropism, blinking light is very low, to significantly
Reduce the efficiency of radiation image-forming system.
Invention content
The purpose of the present invention is by flash fiber be applied to radiographic imaging arts, realize a kind of imaging region it is freely adjustable,
The radiation imaging apparatus based on flash fiber of device radiation injury is reduced, while providing the implementation method of the imaging device.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of radiation imaging apparatus based on flash fiber, the device include collimation radiation source, horizontal direction and Vertical Square
The twinkle jamming placed side by side to grid type, fiber coupler, multimode fibre, photoelectric converter, data processing module and
Computer etc..Highly reflecting films are plated in every flash fiber side and one end for generating passage of scintillation light, do not plate one end of highly reflecting films
It is connected with multimode fibre by fiber coupler, the other end of multimode fibre is connected to photoelectric converter, and photoelectric converter is by light
Signal is converted to electric signal transmission to data processing module and computer.
The flash fiber both horizontally and vertically place by grid type, horizontally and vertically close to putting
Set, the flash fiber interval placed side by side is uniformly and spacing is in 1~10mm, change spacing can adjust imaging region area and at
As the spatial resolution in region.
The flash fiber is not connected to one end of fiber coupler and optical fiber side is coated with highly reflecting films, to reduce optical fiber
Between crosstalk.
The fiber coupler has lower insertion loss to flash fiber and multimode fibre.
The multimode fibre in flicker optical wavelength range there is lower transmission loss, the core diameter of multimode fibre to be more than
Or the core diameter equal to flash fiber, multimode fibre have larger numerical aperture.
The photoelectric converter is multichannel photomultiplier or photomultiplier tube array.
A kind of implementation method of the radiation imaging apparatus based on flash fiber, includes the following steps：
(1) radiation exposure that collimation radiation source is sent out is to the intersection position of horizontal flash fiber and vertical flash fiber,
Passage of scintillation light is generated in flash fiber；
(2) passage of scintillation light arrives separately at fiber coupler along horizontal flash fiber and vertical flash fiber, and optical signal is via light
Fine coupler transfer is transmitted to photoelectric converter to multimode fibre, then through multimode fibre；
(3) photoelectric converter converts optical signals to electric signal, while data processing module records the optical signal source
In the horizontal flash fiber of which root flash fiber vertical with which root, so that it is determined that irradiated position；According to the strong of optical signal
Degree information determines irradiated energy.
(4) through above-mentioned steps (3), required radiant image physical quantity is obtained, realizes the radiant image based on flash fiber.
The advantages of the present invention：
Radiation imaging apparatus of the present invention has imaging region freely adjustable characteristic, flash fiber and multimode fibre
Between efficiency of transmission it is high, device detection efficient is high, by changing the quantity and spacing of optical fiber, can also adjust imaging region
Area.Due to optical fiber diameter very little itself, smaller optical fiber spacing is adjusted, device imaging has high spatial resolution.Meanwhile it is logical
It crosses multimode fibre to open backend electronics equipment and radiation field environment separation, electronics equipment is contributed to reduce radiation injury, tool
There are higher job stability and longer working life.Geological exploration field can utilize grid type flash fiber to monitor
The radiation event on ground；Medical field can carry out human body radiation implementations imaging.
Description of the drawings
Fig. 1 is that the present invention is based on the radiation imaging apparatus structural schematic diagrams of flash fiber.
Fig. 2 be the present invention in radiant image area flicker fiber array placement schematic diagram and radiant image region with put
Penetrate the position relationship schematic diagram in source.
In figure：1. twinkle jamming, 2. fiber couplers, 3. multimode fibres, 4. photoelectric converters, 5. data processing moulds
Block, 6. computers, 7. collimation radiation sources, the flash fiber of 8. grid types arrangement.
The present invention will be described in detail below in conjunction with the accompanying drawings.
Specific implementation mode
As depicted in figs. 1 and 2, a kind of radiation imaging apparatus and grid type optical fiber based on flash fiber provided by the invention
Arrangement mode.The device includes twinkle jamming 1, fiber coupler 2, multimode fibre 3, (the multichannel photoelectricity of photoelectric converter 4
Multiplier tube or photomultiplier tube array), data processing module 5, computer 6, collimation radiation source 7, the passage of scintillation light of grid type arrangement
Fibre 8 etc..Highly reflecting films are plated in the side and one end of every flash fiber, and the one end for not plating highly reflecting films passes through 2 He of fiber coupler
Multimode fibre 3 connects, and the other end of multimode fibre is connected to photoelectric converter 4, and photoelectric converter converts optical signals to telecommunications
Number it is transmitted to data processing module 5 and computer 6.
Radiation imaging apparatus proposed by the present invention is radio-sensitisation properties and waveguide properties based on flash fiber.Such as
The commercial plastic flash fiber BCF-20 of Saint-Gobain (Saint Gobain) company has high photon yield in radiation field.It is fine
Core base material is polystyrene, wherein radiosensitive scintillator crystal materials are adulterated, fiber core refractive index 1.60；Clad material
For polymethyl methacrylate, refractive index 1.49.Fiber core refractive index is more than cladding index, meets the photon of total reflection condition
It can be transmitted by flash fiber.
Highly reflecting films for reducing optical crosstalk between optical fiber, can pass through the silver-plated reality in an end face and side in optical fiber
Existing, silver film thickness is in tens nanometer scales.
For keep grid type arrangement flash fiber relative position fix, can by thin plate be clamped, be flat on it is stable
In plane.
The coupled modes of multimode fibre and photomultiplier tube array are as follows in the present invention：First, careful cutting and grinding multimode
The end face of optical fiber ensures that the end face of multimode fibre is smooth enough；Then, smearing guide-lighting silicone grease in the end face of multimode fibre enhances it
Guiding property and index matching；Finally, multimode fibre is tightly inserted into hole slot and the fixation of photomultiplier tube array.Multimode
Optical fiber is connect by fiber coupler with flash fiber and also uses same processing mode.
In the present invention, the flash fiber 8 of grid type arrangement is the Net long wave radiation imaging region of device.Collimated rays source is sent out
High-energy ray vertical irradiation to imaging region, high-energy ray interacts with doping body in flash fiber, is penetrated with wherein one
For line, which can have an effect with the flash fiber of horizontal direction and the flash fiber of vertical direction simultaneously, inspire edge
The photon of horizontal direction flash fiber transmission and the vertically photon of flash fiber transmission.Part meets optical fiber transmission conditions
Photon be transmitted to multimode fibre 3 through fiber coupler 2 along twinkle jamming 1, photoelectric converter 4 turns the photon received
It is changed to electric signal and amplifies.Data processing module 5 records the location information and energy information of optical signal, is sent to computer progress
Analysis, realizes the imaging of radiation areas.
A kind of radiation imaging apparatus based on flash fiber and concrete implementation method above, for spatial resolution and
The requirement of imaging area is different, can freely be adjusted to grid type flash fiber grid distance, geological prospecting, medical imaging,
The fields such as safety check are all with a wide range of applications.
Claims (3)
1. a kind of radiation imaging apparatus based on flash fiber, it is characterised in that the device includes collimation radiation source, horizontal direction
The twinkle jamming placed side by side with vertical direction grid type, fiber coupler, multimode fibre, photoelectric converter, at data
Manage module and computer；
Highly reflecting films are plated in every flash fiber side and one end for generating passage of scintillation light, and the one end for not plating highly reflecting films passes through light
Fine coupler is connected with multimode fibre, and the other end of multimode fibre is connected to photoelectric converter, and photoelectric converter turns optical signal
Electric signal transmission is changed to data processing module and computer.
2. the radiation imaging apparatus according to claim 1 based on flash fiber, which is characterized in that the flash fiber edge
Horizontally and vertically grid type is placed, horizontally and vertically close to placement, between the flash fiber placed side by side
Every uniform and spacing in 1~10mm, the spatial resolution of imaging region area and imaging region can be adjusted by changing spacing.
3. the implementation method of the radiation imaging apparatus described in claim 1 based on flash fiber, which is characterized in that including following
Step：
(1) radiation exposure that collimation radiation source is sent out is being flickered to the intersection position of horizontal flash fiber and vertical flash fiber
Passage of scintillation light is generated in optical fiber；
(2) passage of scintillation light arrives separately at fiber coupler along horizontal flash fiber and vertical flash fiber, and optical signal is via optical fiber coupling
Clutch is transmitted to multimode fibre, then is transmitted to photoelectric converter through multimode fibre；
(3) photoelectric converter converts optical signals to electric signal, while data processing module records the optical signal from the
Several horizontal flash fibers flash fiber vertical with which root, so that it is determined that irradiated position；Believed according to the intensity of optical signal
Breath determines irradiated energy；
(4) through above-mentioned steps (3), required radiant image physical quantity is obtained, realizes the radiant image based on flash fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810357008.1A CN108535765A (en) | 2018-04-20 | 2018-04-20 | A kind of radiation imaging apparatus and its implementation based on flash fiber |
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| CN201810357008.1A CN108535765A (en) | 2018-04-20 | 2018-04-20 | A kind of radiation imaging apparatus and its implementation based on flash fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988964A (en) * | 2019-12-09 | 2020-04-10 | 上海大学 | Composite optical fiber radiation detector |
| CN111220632A (en) * | 2018-11-23 | 2020-06-02 | 西门子医疗有限公司 | X-ray detector, imaging device and method for operating an X-ray detector |
| CN111596337A (en) * | 2020-06-03 | 2020-08-28 | 中国人民解放军火箭军工程大学 | Tritium detection method in high radon environment based on scintillation fiber array |
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| US4942302A (en) * | 1988-02-09 | 1990-07-17 | Fibertek, Inc. | Large area solid state nucler detector with high spatial resolution |
| US20060202125A1 (en) * | 2005-03-14 | 2006-09-14 | Avraham Suhami | Radiation detectors |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111220632A (en) * | 2018-11-23 | 2020-06-02 | 西门子医疗有限公司 | X-ray detector, imaging device and method for operating an X-ray detector |
| CN110988964A (en) * | 2019-12-09 | 2020-04-10 | 上海大学 | Composite optical fiber radiation detector |
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| CN111596337B (en) * | 2020-06-03 | 2022-02-01 | 中国人民解放军火箭军工程大学 | Tritium detection method in high radon environment based on scintillation fiber array |
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Application publication date: 20180914 |