CN101876712A - Pulse radiating field time-space resolution measuring system based on optical fiber beam - Google Patents
Pulse radiating field time-space resolution measuring system based on optical fiber beam Download PDFInfo
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- CN101876712A CN101876712A CN2009102544292A CN200910254429A CN101876712A CN 101876712 A CN101876712 A CN 101876712A CN 2009102544292 A CN2009102544292 A CN 2009102544292A CN 200910254429 A CN200910254429 A CN 200910254429A CN 101876712 A CN101876712 A CN 101876712A
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- fibre bundle
- space resolution
- measuring system
- field time
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Abstract
The invention relates to a pulse radiating field time-space resolution measuring system based on an optical fiber beam, which comprises a thick pinhole (1), a scintillator (2), an optical system, an optical fiber beam array (5), a transmission optical cable (6) and a photoelectric detector (7). The invention solves the technical problems of low sensitivity and small dynamic range of the traditional time-space resolution measuring way, improves the sensitivity of the system, can realize the output of signals with different strengths and achieve the aims of range division and improvement of dynamic range of the system and has convenient maintenance and processing and free distribution.
Description
Technical field
The present invention relates to a kind of detector system, relate in particular to a kind of detector system that the impulse radiation field time-space resolution is measured that is suitable for.
Background technology
For the measurement of impulse radiation field (rays such as neutron, gamma), some is to need the time dependent situation of knowing reaction district each point.
The main method of time-space resolution has: framing camera and optical fiber time-space resolution are measured.The high speed framing camera can obtain several reaction zone images continuously in the certain hour of interval, but this method has significant limitation, mainly is that the sensitivity of system is lower, is of limited application, and the dynamic range of system is less, is difficult to cover the whole evolution of signal.Multichannel if desired, then system scale is too huge, safeguards and field adjustable all has very big difficulty.
Optical fiber time-space resolution measuring technique is to get rational sampled point on the reaction zone image, and these are adopted the some continuous recording, analyzes the evolution in entire reaction district according to these sampled points.Its basic functional principle be by pin hole with radial imaging to scintillator, scintillator is converted to visible images with ray image, with optical fiber the signal of ad-hoc location on the scintillator is transferred to photodetector again, photodetector converts light signal to electric signal, by oscillograph recording.The advantage that the optical fiber time-space resolution is measured is to make photodetector away from radiation field, reduces shielding requirements, and detector can be reused.But because the efficient of optical fiber transmission signal is very low, there is the technical matters that system sensitivity is lower, dynamic range is less in optical fiber time-space resolution measuring technique.In addition, present system is for fear of the direct irradiation of ray to optical fiber, with camera lens scintillator is imaged onto fiber array departing from the light path of ray, because image planes are not parallel with object plane, image deformation is big, is difficult to recovery.In order to overcome the above problems, we have proposed the impulse radiation field time-space resolution measuring system based on fibre bundle.
Summary of the invention
The object of the invention provides a kind of impulse radiation field time-space resolution measuring system based on fibre bundle, and it has solved the low and little technical matters of dynamic range of existing time-space resolution metering system sensitivity.
Technical solution of the present invention is:
A kind of impulse radiation field time-space resolution measuring system based on fibre bundle, its special character is: comprise thick pin hole 1, scintillator 2, optical system, fibre bundle array 5, transmission cable 6 and photodetector 7; Described optical system comprises optics casing 8 and is arranged on the catoptron 3 in the optics casing 8 and the camera lens 4 that is coupled; Described fibre bundle array 5 is made up of contact pin body 51 and the signal receiving end 61 that is arranged in the transmission cable 6 on the contact pin body 51; Described scintillator 3 receives and passes the ray of thick pin hole 1 and send visible light, the light that described catoptron 3 sends scintillator reflects and passes through 4 imagings of coupling camera lens to fibre bundle array 5, and the light signal of described fibre bundle array 5 transfers to described photodetector 7 by described transmission cable 6.
Above-mentioned transmission cable 6 is for dividing a range fibre bundle transmission assembly, its receiving end 61 be can the while transmitting optical signal multifiber, its output terminal is divided into the two-way at least that quantity does not wait with multifiber.
The receiving end number of fibers of above-mentioned transmission cable 6 is 14, and 14 optical fiber are divided into 1 optical fiber to its output terminal and 13 optical fiber are exported respectively.
The signal receiving end of every fibre bundle all leads to aiming coupling camera lens 4 centers in the above-mentioned fibre bundle array 5.
The fibre bundle of above-mentioned fibre bundle array 5 is arranged to square formation or linear array.
Above-mentioned measuring system also comprises at least two oscillographs 10, and described oscillograph 10 connects one to one with photodetector 7, is used for recording light electric explorer 7 electrical signal converted.
Above-mentioned catoptron 3 and optical axis angle at 45.
Above-mentioned optics casing 8 inside surfaces are made blackout and are handled.
Advantage of the present invention is:
1, the present invention has adopted the fibre bundle array, the sensitivity that has improved system on the basis that guarantees system bandwidth.
2, the present invention can realize the output of varying strength signal at the multifiber bundle demultiplexing of signal output part with transmission cable, can reach the purpose of branch range, raising system dynamics scope.
3, the present invention is easy to maintenance, easy to process, layout is free.Because large core fiber is difficult in maintenance, the situation that is easy to rupture, and in case rupture, common heat sealing machine can not welding, has increased difficulty to maintenance.The difficult processing of the end face of large core fiber, and subject to damage.The layout of fibre bundle array of the present invention can be arranged to square formation or line up a line according to actual needs, also can otherwise arrange.Fibre bundle length designs according to actual needs and processes.
4, the present invention makes full use of fiber-optic signal, and fibre bundle array and scintillator are coupled better, has improved coupling efficiency, thereby has improved the signal homogeneity, has reduced distorted signals.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is parallel contact pin body light path synoptic diagram;
Fig. 3 is a convergent type contact pin body light path synoptic diagram;
Fig. 4 is an integrated type contact pin body structure synoptic diagram;
Reference numeral is as follows: the thick pin hole of 1-, 2-scintillator, 3-catoptron, the 4-camera lens that is coupled, 5-fibre bundle array, 51-contact pin body, 6-transmission cable, 61-transmission cable signal receiving end, 7-photodetector, 8-optics casing, 9-cable, 10-oscillograph, 11-radiation source.
Embodiment
The present invention is based on the impulse radiation field time-space resolution measuring system of fibre bundle, comprise thick pin hole 1, scintillator 2, optical system, fibre bundle array 5, transmission cable 6, photodetector 7 and oscillograph 10; Optical system comprises optics casing 8 and is arranged on the catoptron 3 in the optics casing 8 and the camera lens 4 that is coupled; Fibre bundle array 5 is made up of contact pin body 51 and the signal receiving end 61 that is arranged in the transmission cable 6 on the contact pin body 51; Scintillator 3 receives and passes the ray of thick pin hole 1 and send visible light, the light that catoptron 3 sends scintillator reflects and passes through 4 imagings of coupling camera lens to fibre bundle array 5, the light signal of fibre bundle array 5 transfers to described photodetector 7 by described transmission cable 6, detector 7 is converted to electric signal with light signal, oscillograph 10 connects one to one with photodetector 7, is used for recording light electric explorer 7 electrical signal converted.Catoptron 3 general and optical axis angles at 45, optics casing 8 inside surfaces are made blackout and are handled.
In order to realize that the branch range measures, transmission cable 6 is for dividing a range fibre bundle transmission assembly, its receiving end 61 be can the while transmitting optical signal multifiber, its output terminal is divided into the two-way at least that quantity does not wait with multifiber.For example, the receiving end number of fibers of transmission cable 6 is 14, and 14 optical fiber are divided into 1 optical fiber to its output terminal and 13 optical fiber export two photodetectors 7 respectively to, and photodetector 7 links to each other with an oscillograph respectively.
In order to improve coupling efficiency, fibre bundle array 5 adopts the convergent type contact pin body of metal or ceramic insertion core, the signal receiving end of every in transmission cable fibre bundle all can be aimed at coupling camera lens 4 centers, the fibre bundle of fibre bundle array 5 can be arranged to square formation, linear array or other forms.
During work, radiation source 11 sends gamma or neutron ray, be imaged onto on the scintillator 2 through blocked up pin hole 1, image on the scintillator 2 is through catoptron 3 reflections, and by the coupling camera lens 4 be coupled on the fibre bundle array 5, light signal is transferred on the photodetector 7 through fibre bundle array 5, and it is photomultiplier that photodetector 7 can adopt PMT, and photodetector 7 output signals transfer to oscillograph 10 through cable 9 and carry out record.
In order to guarantee that each oscillograph all can record signal, oscillograph 10 adopts the mode of external trigger, needs No. one detector as trigger pip, the triggering synchronous machine, synchrodyne sends multiplex pulse signal triggering oscillograph 10, the signal that oscillograph 10 recording light electric explorers 7 send.
Optical signal transmission device of the present invention is the fibre bundle array of a kind of minute range, the mentality of designing of fibre bundle be multifiber is gathered into a branch of, the transmission of one line signal.Wherein the manufacturing process of fibre bundle is as follows: many identical common multimode optical fibers of intercepted length at first; be made into optical cable protection; with these fiber groupings boundlings, the two ends of fibre bundle correspondence are gathered with metal or ceramic insertion core then, made the fibre bundle transmission assembly.Optical cable one end is a signal receiving end, and an end is a signal output part.In order to improve spatial resolution, the signal receiving end of fibre bundle is only gathered with metal or ceramic insertion core, do not do connector; And signal output part is made the needed joints of optical fibre, so that be connected with photodetector 7.The transmission bandwidth of fibre bundle is identical with used bandwidth of an optical fiber, and easy to maintenance, and is much more superior than the large core fiber that adopts same length.The sharpest edges of fibre bundle array are under the condition that guarantees system bandwidth, improved the sensitivity of system, in addition, fibre bundle is with respect to large core fiber, be easy to safeguard, because the maintenance of large core fiber is very difficult, the situation that is easy to rupture, and in case rupture, common heat sealing machine can not welding, cause very big loss to work, the difficult processing of the end face of large core fiber in addition, and subject to damage.And the layout of fibre bundle array can be arranged to square formation or line up a line according to actual needs, also can otherwise arrange.Fibre bundle length designs according to actual needs and processes.With multifiber bundle demultiplexing optical fibre set, send into different photodetectors at signal output part respectively, can realize the output of varying strength signal, reach the purpose of branch range, raising system dynamics scope.
The light path of detector system of the present invention adopts catoptron 3 to make optical path-deflecting, adopt 45 ° of mirror reflects, make 90 ° of optical path-deflectings, and be coupled with the coupling camera lens 4 of object lens of large relative aperture, be imaged onto on the fibre bundle array 5, this makes fibre bundle array 5 avoid the direct irradiation of ray, has reduced the uncertainty of measuring.In addition, 90 ° of optical path-deflectings, coupling camera lens image deformation minimum.In order to remove the influence of parasitic light, and play dustproof effect, scintillator 2, catoptron 3 and coupling camera lens 4 place in the optics casing 8 of a black sealing.
For fibre bundle array 5 and scintillator 2 are coupled better, the present invention can adopt parallel contact pin body or convergent type contact pin body.Big picture such as to become is example, adopts parallel contact pin body, and as shown in Figure 2, the focal length of camera lens is f, and when big picture such as becoming, object distance u equals image distance v, and size is 2f.Then the radius a at place, the pairing lens center of optical fiber maximum incident angle can represent with following formula:
a＝2ftan(θ
max)
If fibre bundle array outermost end optical fiber is d apart from centre distance, the diameter of the emergent pupil of lens is D, and then when d+a＞D/2, the capacity gauge of this optical fiber is not fully utilized, and be fully utilized at the optical fiber capacity gauge of center, this has just caused the distortion of signal.Obviously do not make full use of fiber-optic signal, cause distorted signals to be inevitable.
Convergent type contact pin body makes each pin holes concentrate one's gaze on the lens center as shown in Figure 3 and Figure 4 in design.
Place, the pairing lens center of optical fiber maximum incident angle size:
l＝f(tan(θ
max-α)+tan(θ
max+α))
When α was very little, following formula can be approximated to be:
l≈2ftan(θ
max)
Because the finder lens center, so each pairing useful area of optical fiber dot matrix is basic identical, so no matter 1＞D or 1＜D, the relative error of each measuring point can be very not big yet.So just improve the coupling efficiency of scintillator, improved the homogeneity of system simultaneously to optical fiber.
Claims (8)
1. the impulse radiation field time-space resolution measuring system based on fibre bundle is characterized in that: comprise thick pin hole (1), scintillator (2), optical system, fibre bundle array (5), transmission cable (6) and photodetector (7); Described optical system comprises optics casing (8) and is arranged on the catoptron (3) in the optics casing (8) and the camera lens (4) that is coupled; Described fibre bundle array (5) is made up of contact pin body (51) and the signal receiving end (61) that is arranged in the transmission cable (6) on the contact pin body (51); Described scintillator (3) receives and passes the ray of thick pin hole (1) and send visible light, the light that described catoptron (3) sends scintillator reflects and passes through the imaging of coupling camera lens (4) to fibre bundle array (5), and the light signal of described fibre bundle array (5) transfers to described photodetector (7) by described transmission cable (6).
2. the impulse radiation field time-space resolution measuring system based on fibre bundle according to claim 1, it is characterized in that: described transmission cable (6) is for dividing range fibre bundle transmission assembly, its receiving end (61) is the multifiber of transmitting optical signal simultaneously, and its output terminal is divided into the two-way at least that quantity does not wait with multifiber.
3. the impulse radiation field time-space resolution measuring system based on fibre bundle according to claim 2, it is characterized in that: the receiving end number of fibers of described transmission cable (6) is 14, and 14 optical fiber are divided into 1 optical fiber to its output terminal and 13 optical fiber are exported respectively.
4. according to claim 1 or 2 or 3 described impulse radiation field time-space resolution measuring systems based on fibre bundle, it is characterized in that: the signal receiving end of every fibre bundle all leads to aiming coupling camera lens (4) center in the described fibre bundle array (5).
5. the impulse radiation field time-space resolution measuring system based on fibre bundle according to claim 4 is characterized in that: the fibre bundle of described fibre bundle array (5) is arranged to square formation or linear array.
6. the impulse radiation field time-space resolution measuring system based on fibre bundle according to claim 4, it is characterized in that: described measuring system also comprises at least two oscillographs (10), described oscillograph (10) connects one to one with photodetector (7), is used for recording light electric explorer 7 electrical signal converted.
7. the impulse radiation field time-space resolution measuring system based on fibre bundle according to claim 6 is characterized in that: described catoptron (3) and optical axis angle at 45.
8. the impulse radiation field time-space resolution measuring system based on fibre bundle according to claim 7 is characterized in that: described optics casing (8) inside surface is made blackout and is handled.
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| CN2009102544292A CN101876712B (en) | 2009-12-22 | 2009-12-22 | Pulse radiating field time-space resolution measuring system based on optical fiber beam |
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| CN2009102544292A CN101876712B (en) | 2009-12-22 | 2009-12-22 | Pulse radiating field time-space resolution measuring system based on optical fiber beam |
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| CN101876712B CN101876712B (en) | 2012-08-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156290A (en) * | 2011-03-18 | 2011-08-17 | 西北核技术研究所 | Ray absolute measurement device and method for image diagnosis |
| CN102565840A (en) * | 2012-02-06 | 2012-07-11 | 清华大学 | Scintillation detector |
| CN106526652A (en) * | 2016-11-04 | 2017-03-22 | 西北核技术研究所 | ZnO material-based ultrafast pulse radiation imaging system and method |
| CN107390255A (en) * | 2017-07-06 | 2017-11-24 | 中国科学院高能物理研究所 | A kind of discrete detector of new CT |
| 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 |
-
2009
- 2009-12-22 CN CN2009102544292A patent/CN101876712B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156290A (en) * | 2011-03-18 | 2011-08-17 | 西北核技术研究所 | Ray absolute measurement device and method for image diagnosis |
| CN102156290B (en) * | 2011-03-18 | 2013-01-02 | 西北核技术研究所 | Ray absolute measurement device and method for image diagnosis |
| CN102565840A (en) * | 2012-02-06 | 2012-07-11 | 清华大学 | Scintillation detector |
| CN106526652A (en) * | 2016-11-04 | 2017-03-22 | 西北核技术研究所 | ZnO material-based ultrafast pulse radiation imaging system and method |
| CN106526652B (en) * | 2016-11-04 | 2019-01-01 | 西北核技术研究所 | A kind of ultrafast pulse radiation image-forming system and method based on ZnO material |
| CN107390255A (en) * | 2017-07-06 | 2017-11-24 | 中国科学院高能物理研究所 | A kind of discrete detector of new CT |
| CN107390255B (en) * | 2017-07-06 | 2023-11-24 | 中国科学院高能物理研究所 | Novel CT discrete 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 |
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| CN101876712B (en) | 2012-08-22 |
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