CN205426825U - A scanning device for back scattering imaging system - Google Patents
A scanning device for back scattering imaging system Download PDFInfo
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- CN205426825U CN205426825U CN201520828869.5U CN201520828869U CN205426825U CN 205426825 U CN205426825 U CN 205426825U CN 201520828869 U CN201520828869 U CN 201520828869U CN 205426825 U CN205426825 U CN 205426825U
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- rotational shell
- fan
- shaped
- scanning means
- shell
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Abstract
The utility model relates to a scanning device for back scattering imaging system, including rotatory shell (2) and gamma ray source (5), fan -shaped collimater (10), perforation (4) have been opened out along the circumference uniformly in the middle part of rotatory shell (2), and rotatory shell (2) suit is on incurvated axle (1) that has flexion (1 -1), and the inboard of flexion (1 -1) on incurvated axle (1) is fixed in gamma ray source (5), and the focus lies in rotation axis, fan -shaped collimater (10) perpendicular to rotation axis sets up and its serrated end is fixed on gamma ray source (5), and it has fan -shaped slit (11) to open in fan -shaped collimater (10), and central angle and rotatory shell (2) of fan -shaped slit (11) are gone up adjacent outgoing hole (4) to belong to subtended angle that planar central point became for their the same. This device simple structure designs the exquisiteness, and stability is high, can realize in narrow and small space that the one -dimensional that the threadiness X ray was restrainted scans, can reduce the X ray leakage effectively.
Description
Technical field
This utility model belongs to radiant image detection equipment technical field, is specifically related to a kind of scanning means for back scattering imaging system.
Background technology
X-ray inspection system is applied to airport, harbour, the examination of cargo at the outpost of the tax office, land route and the small-sized parcel entrained by personnel, baggage check.System based on the detection of X transmission potential generally uses X-ray machine to send planar fan ray bundle, and line detector disposably obtains string transmission data, forms scanogram by periodically obtaining column data.Also have a class X-ray inspection system, collect X-ray of backscattering, form backscatter images.In order to collect backscattered photons as far as possible, use block backscatter detector, now need X-ray is constrained to the wire beam that cross-sectional area is little, and require that wire beam can be with periodic variation scanning direction.Current great majority all use pre-collimator to form spot scan towards the X-ray back scattering imaging equipment of safety check application, such as, dish type slit chopper wheel, it is a kind of simple spot scan device, advantage is dish type slit chopper wheel and radiographic source relative separation, frame for movement is simple, and shortcoming is that beam cross-section area changes, and alpha ray shield weak effect；Tubular flying spot scanner, it is by carving spiral slit on rotatable cylinder or semicircular cylinder, advantage is that radiographic source is contained in outside rotating cylinder, install simply and heat dissipation problem does not highlights, shortcoming is that the difficulty of processing of rotating cylinder is bigger, and scanning device rigidity greatly weakens, the requirement to material is higher, also has alpha ray shield problem simultaneously.
Utility model content
For defect present in prior art, the purpose of this utility model is to provide a kind of scanning means for back scattering imaging system, this apparatus structure is simple, deft design, the one-dimensional scanning of wire X-ray beam can be realized in small space, can efficiently reduce X-ray leakage, and rotation speed requirements to rotational shell and rigid requirements to material can be greatly reduced, device stability is high.
For reaching object above, the technical solution adopted in the utility model is: a kind of scanning means for back scattering imaging system, the radiographic source including rotational shell and being located in rotational shell, fan-shaped collimator, rotational shell is contained on the inside crankshaft running through its inner space by bearing holder (housing, cover), and rotational shell one end outer surface is set with power wheel；
The middle part of described rotational shell has perforation hole the most equably, and the centrage of all perforation holes is coplanar, and the centrage place plane of all perforation holes is perpendicular with the rotation axis of rotational shell；
The middle part of described inside crankshaft has the bending section of off-center axis, and described radiographic source is fixed on the inner side of bending section on inside crankshaft, and radiogenic focus is positioned on the rotation axis of rotational shell；
The serrated end of described fan-shaped collimator is perpendicular to the rotation axis of rotational shell and arranges and its serrated end is fixed on radiographic source, having fan-shaped slit in fan-shaped collimator, on fan-shaped the center covering of the fan of slit, rotational shell, centrage place plane and the radiogenic focus of all perforation holes are in the same plane；The central angle perforation hole adjacent with on rotational shell of fan-shaped slit is identical relative to subtended angle formed by the central point of they place planes.
Further, described radiographic source is X-ray tube, the both sides shaft part of the bending section (1-1) of described inside crankshaft (1) is hollow shaft part, has the X-ray tube feed cable being connected with X-ray tube, X-ray tube control circuit cable and X-ray tube refrigerating fluid to import, derive into pipeline in the both sides hollow shaft part of the bending section of described inside crankshaft.
Further, rotational shell is that the spindle bodily form cylindrically is heaved at middle part, and perforation hole is opened on the cylinder shell in the middle part of rotational shell.
Further, the material of rotational shell is cupro lead.
Further, the surface of the fan-shaped slit of fan-shaped collimator uses note to ooze tungsten process.
Further, the other end relative with power wheel on rotational shell is provided with the bevel gear pair being made up of major and minor bevel gear, master bevel gear is sleeved on rotational shell, one end away from gear of secondary bevel gear connects position sensor, the number that the ratio of the number of teeth of the number of teeth of master bevel gear and supporting secondary bevel gear is perforation outputed on rotational shell.
Further, on rotational shell, the number of outputed perforation is 6-8.
This utility model has the advantage that
The first, the X-ray beam that the radiographic source in being located at device is launched is constrained to planar fan ray bundle by fan-shaped collimator, plane sector X-ray beam is shot out by the perforation hole being uniformly arranged on rotational shell, obtain wire beam, such that it is able to form continuous print point, the number of photons passed through within sample time can reach the maximum that perforation hole area is determined, is effectively improved backscatter signal counting；In the case of highlight flux, the spatial resolution of image can be improved by improving sample frequency.
The second, during rotational shell rotates a circle, using this device can complete to scan for several times, so the rotation speed requirements of rotational shell is greatly reduced, the requirement to material is greatly reduced.
3rd, in this device, on rotational shell, outputed perforation further functions as outgoing collimating effect, and perforation hole quantity is only 6～8, and difficulty of processing is substantially reduced.
4th, this device takes the high-resolution reconstruction that the mode of spot scan, beneficially later image process.
5th, this device takes the rotational shell (the preferably spindle bodily form) being made up of thick and heavy cupro lead to be closed therein by X-ray tube, thus the leaking dose of X-ray can be greatly reduced, thus can obtain 2 benefits, the first reduces the X-ray leakage agent dose rate of whole equipment, the shielding work making X-ray will be simplified, it two is to reduce the background numerical value of become image, is conducive to improving the signal to noise ratio of image.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of the scanning means for back scattering imaging system that this utility model provides, and for clearly illustrating agent structure, omits power wheel, bevel gear to parts such as, position sensor and fan-shaped collimators in Fig. 1；
Fig. 2 (a) is the structural representation of spindle bodily form rotational shell in Fig. 1；Fig. 2 (b) be in Fig. 2 (a) A-A to schematic diagram；
Fig. 3 is the relative position view of inside crankshaft and X-ray tube in Fig. 1；
Fig. 4 (a) is spindle bodily form rotational shell and X-ray tube, the position relationship schematic diagram of fan-shaped collimator；Fig. 4 (b) be in Fig. 4 (a) B-B to schematic diagram；
Fig. 5 is the relative position view of X-ray tube and fan-shaped collimator in Fig. 1；
Fig. 6 is inside crankshaft and the assembling schematic diagram of spindle bodily form rotational shell in Fig. 1；
Fig. 7 is the assembling schematic diagram of power wheel and the position sensor being located in Fig. 1 on spindle rotational shell；
Fig. 8 is the location resolution schematic diagram of the bevel gear pair in Fig. 7 and position sensor.
Reference:
1. secondary bevel gear 15. position sensor of fan-shaped slit 12. power wheel 13. master bevel gear 14. of the fan-shaped collimator 11. of the flat fan-ray beam 7-1.X light pipe refrigerating fluid incoming line 7-2.X light pipe refrigerating fluid outgoing line 8.X light pipe feed cable 9.X light pipe control circuit cable 10. that inside crankshaft 2. rotational shell 3. bearing 4. perforation hole 5. radiographic source 6. is collimated
Detailed description of the invention
With detailed description of the invention, this utility model is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of scanning means for back scattering imaging system that this utility model provides includes rotational shell 2 and the radiographic source 5 being located in rotational shell 2, fan-shaped collimator 10, rotational shell 2 is sleeved on the inside crankshaft 1 running through its inner space by bearing 3 (see Fig. 6), and rotational shell 2 one end outer surface is set with power wheel 12 (see Fig. 7)；The middle part of described rotational shell 2 has perforation hole 4 (see Fig. 2 (a)) the most equably, the centrage of all perforation holes 4 is coplanar (see Fig. 2 (b)), and the centrage place plane of all perforation holes 4 is perpendicular with the rotation axis of rotational shell 2；The middle part of described inside crankshaft 1 has the bending section 1-1 of off-center axis, and described radiographic source 5 is fixed on the inner side (see Fig. 3) of bending section 1-1 on inside crankshaft 1, and the focus of radiographic source 5 is positioned on the rotation axis of rotational shell 2；The rotation axis that described fan-shaped collimator 10 is perpendicular to rotational shell 2 arranges and its serrated end is fixed on radiographic source 5, fan-shaped collimator 10 has fan-shaped slit 11 (see Fig. 5), the centrage place plane of all perforation holes 4 and the focus (see Fig. 4 (a), 4 (b)) in the same plane of radiographic source 5 on fan-shaped the center covering of the fan of slit 11, rotational shell 2；The central angle perforation hole 4 adjacent with on rotational shell 2 of fan-shaped slit 11 is identical relative to subtended angle formed by the central point of they place planes.The central angle of fan-shaped slit 11 can be equal with the central angle of fan-shaped collimator 10.
In said structure of the present utility model, the perforation hole 4 of fan-shaped collimator 10 and rotational shell 2 jointly acts on and can ensure have ray to penetrate in only one of which perforation hole 4 at any time, and there is ray to penetrate from a certain perforation hole 4 at any time, and ensure the least X-ray scattering.
In this utility model, inside crankshaft 1 is non-rotatable, it is for supporting whole device and also serving as the fixed component of radiographic source 5, therefore, as it is shown on figure 3, inside crankshaft 1 is designed to middle part has the structure of bending section 1-1, and its both sides are coaxial with the rotary shaft of device, when so radiographic source 5 being fixed on its bending section 1-1, it is ensured that the focus of radiographic source 5 is still on the central axis (i.e. the rotation axis of rotational shell 2) of inside crankshaft 1.For reducing the deadweight of device, inside crankshaft 1 can be steel hollow axle.
In this utility model, the bearing 3 being located between inside crankshaft 1 and rotational shell 2 can select rolling bearing can also select sliding bearing.
In this utility model, the power wheel 12 being located on rotational shell 2 can be belt pulley, it is also possible to be gear, and power wheel 12 can make rotational shell 2 high speed rotating under the drive of external motor.
In this utility model, radiographic source 5 can use X-ray tube.The X-ray tube feed cable 8, X-ray tube control circuit cable 9 and the X-ray tube refrigerating fluid that are connected supporting with X-ray tube imports, outgoing line 7-1,7-2 can be entered inside device by the through hole being located in the shaft part of inside crankshaft 1 bending section 1-1 both sides.
This utility model one preferred embodiment in, rotational shell 2 can use middle part heave the spindle bodily form cylindrically.Perforation hole 4 can be opened on the cylinder shell in the middle part of rotational shell 2 (by Fig. 2 (a), 4 (a)).
Rotational shell 2 can use cupro lead to make, and has certain wall thickness.So, both can effectively block X-ray, can guarantee that simultaneously rotational shell 2 due to have higher rigidity when high speed rotating indeformable, it is achieved the stable operation of equipment.
In this utility model, the surface of the fan-shaped slit 11 of fan-shaped collimator 10 can use note to ooze tungsten and process, and its effect is to reduce ray ray scattering problem at collimator perforation hole or slit.
As shown in Figure 7,8, in another kind of preferred embodiment, the other end relative with power wheel 12 on rotational shell 2 is provided with the bevel gear pair being made up of major and minor bevel gear 13,14, master bevel gear 13 is sleeved on rotational shell 2, one end away from gear of secondary bevel gear 14 connects position sensor 15, the number that the ratio of the number of teeth of the number of teeth of master bevel gear 13 and supporting secondary bevel gear 14 is perforation 4 outputed on rotational shell 2.This utility model uses this structure, and position sensor 15 can be made to rotate under the drive of bevel gear pair, thus can obtain, by position sensor 15, the Angle Position that current rotational shell 2 rotates.
Preferably, on rotational shell 2, the number of outputed perforation 4 is 6-8, more preferably 8.
The scanning means that this utility model provides is in use, by on the stand being fixed on back scattering imaging equipment of inside crankshaft 1, during rotational shell 2 at the uniform velocity rotates, after the X-ray beam of radiographic source 5 such as X-ray tube transmitting is by fan-shaped collimator 10, form the planar fan ray bundle 6 after collimation, plane sector X-ray beam 6 is shot out by the perforation hole 4 being uniformly arranged on rotational shell 2, obtain wire beam, wire beam can be swept to the other end from one end continuously, forms periodic spot scan.
Above-described embodiment is simply to illustration of the present utility model, and this utility model can also be implemented, without departing from main idea of the present utility model or substitutive characteristics with other ad hoc fashion or other particular form.Therefore, it is regarded as illustrative rather than determinate from the point of view of the embodiment of description is in terms of any.Scope of the present utility model should be illustrated by appended claims, and the change of any and intention of claim and scope equivalence also should be included in the range of this utility model.
Claims (7)
1. the scanning means for back scattering imaging system, it is characterised in that
Described scanning means includes rotational shell (2) and the radiographic source (5) being located in rotational shell (2), fan-shaped collimator (10), rotational shell (2) is sleeved on the inside crankshaft (1) running through its inner space by bearing (3), and rotational shell (2) one end outer surface is set with power wheel (12)；
The middle part of described rotational shell (2) has perforation hole (4) the most equably, the centrage of all perforation holes (4) is coplanar, and the centrage place plane of all perforation holes (4) is perpendicular with the rotation axis of rotational shell (2)；
The middle part of described inside crankshaft (1) has the bending section (1-1) of off-center axis, described radiographic source (5) is fixed on the inner side of the upper bending section (1-1) of inside crankshaft (1), and the focus of radiographic source (5) is positioned on the rotation axis of rotational shell (2)；
The rotation axis that described fan-shaped collimator (10) is perpendicular to rotational shell (2) arranges and its serrated end is fixed on radiographic source (5), fan-shaped collimator (10) has fan-shaped slit (11), the centrage place plane of the upper all perforation holes (4) of the center covering of the fan of fan-shaped slit (11), rotational shell (2) and the focus of radiographic source (5) in the same plane；It is identical relative to subtended angle formed by the central point of they place planes that the central angle of fan-shaped slit (11) goes up adjacent perforation hole (4) with rotational shell (2).
Scanning means the most according to claim 1, it is characterized in that, described radiographic source (5) is X-ray tube, the both sides shaft part of the bending section (1-1) of described inside crankshaft (1) is hollow shaft part, is provided with X-ray tube feed cable (8), X-ray tube control circuit cable (9) and the importing of X-ray tube refrigerating fluid, the outgoing line (7-1,7-2) being connected with X-ray tube in the both sides hollow shaft part of the bending section (1-1) of described inside crankshaft (1).
Scanning means the most according to claim 1, it is characterised in that rotational shell (2) is the spindle bodily form that middle part heaves cylindrically, perforation hole (4) is opened on the cylinder shell at rotational shell (2) middle part.
Scanning means the most according to claim 1, it is characterised in that the material of rotational shell (2) is cupro lead.
Scanning means the most according to claim 1, it is characterised in that the surface of the fan-shaped slit (11) of fan-shaped collimator (10) uses note to ooze tungsten and processes.
6. according to the arbitrary described scanning means of claim 1-5, it is characterized in that, the upper other end relative with power wheel (12) of rotational shell (2) is provided with the bevel gear pair being made up of major and minor bevel gear (13,14), master bevel gear (13) is sleeved on rotational shell (2), one end away from gear of secondary bevel gear (14) connects position sensor (15), and the number of teeth of master bevel gear (13) is the number of outputed perforation (4) on rotational shell (2) with the ratio of the number of teeth of supporting secondary bevel gear (14).
Scanning means the most according to claim 6, it is characterised in that on rotational shell (2), the number of outputed perforation (4) is 6-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520828869.5U CN205426825U (en) | 2015-10-23 | 2015-10-23 | A scanning device for back scattering imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520828869.5U CN205426825U (en) | 2015-10-23 | 2015-10-23 | A scanning device for back scattering imaging system |
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| Publication Number | Publication Date |
|---|---|
| CN205426825U true CN205426825U (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520828869.5U Expired - Fee Related CN205426825U (en) | 2015-10-23 | 2015-10-23 | A scanning device for back scattering imaging system |
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| Country | Link |
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| CN (1) | CN205426825U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158282A (en) * | 2015-10-23 | 2015-12-16 | 中国原子能科学研究院 | Scanning device used for back-scattering imaging system |
| CN106297928A (en) * | 2016-08-28 | 2017-01-04 | 李新菊 | A kind of Medical anti-radiation material |
-
2015
- 2015-10-23 CN CN201520828869.5U patent/CN205426825U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158282A (en) * | 2015-10-23 | 2015-12-16 | 中国原子能科学研究院 | Scanning device used for back-scattering imaging system |
| CN105158282B (en) * | 2015-10-23 | 2018-05-22 | 中国原子能科学研究院 | A kind of scanning means for back scattering imaging system |
| CN106297928A (en) * | 2016-08-28 | 2017-01-04 | 李新菊 | A kind of Medical anti-radiation material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20191023 |