CN208283569U - Twilight sunset detection device - Google Patents
Twilight sunset detection device Download PDFInfo
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- CN208283569U CN208283569U CN201820684880.2U CN201820684880U CN208283569U CN 208283569 U CN208283569 U CN 208283569U CN 201820684880 U CN201820684880 U CN 201820684880U CN 208283569 U CN208283569 U CN 208283569U
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- 238000001514 detection method Methods 0.000 title claims abstract description 58
- 230000005855 radiation Effects 0.000 claims abstract description 10
- 238000012937 correction Methods 0.000 claims description 13
- 229910052793 cadmium Inorganic materials 0.000 claims description 12
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 12
- 230000005284 excitation Effects 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 229910001385 heavy metal Inorganic materials 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims 1
- 229910052721 tungsten Inorganic materials 0.000 claims 1
- 239000010937 tungsten Substances 0.000 claims 1
- 239000002253 acid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008034 disappearance Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000000155 isotopic effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000012491 analyte Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a kind of twilight sunset detection devices.Twilight sunset detection device includes: X-ray tube；First reading circuit, for connect with detected detector, when detection, is detected detector and receives X-ray beam radiation, and to the first reading circuit the first detectable signal of output, the first reading circuit forms according to the first detectable signal and exports the first measuring signal；Remaining ray detector；Second reading circuit is connect with remaining ray detector, and remaining ray detector receives X-ray beam radiation and exports the second detectable signal to the second reading circuit, and the second reading circuit forms according to the second detectable signal and exports the second measuring signal；Computing device, with the first reading circuit and the second reading circuit be connected separately and according to shutdown X-ray tube power supply after the first measuring signal and the second measuring signal calculates and export twilight sunset detect signal.The utility model has the advantages that easy, reliable.
Description
Technical field
The utility model relates to radiation monitoring technical field, in particular to a kind of twilight sunset detection device.
Background technique
After twilight sunset refers to that the external excitation signal (such as beam or visible light) of scintillation detector disappears, scintillation detector
The transmitting of the visible light of a period of time can still be maintained.The intensity of twilight sunset substantially exponentially decays at any time.
Twilight sunset is generally measured with the relative intensity value of a period of time after extrinsic motivation blackout.For example, a typical case
Cesium iodide (thallium) (CsI (Tl)) scintillation detector, the scintillation detector is defeated in the presence of external excitation signal (such as X-ray beam)
Signal is unit 1 out, and the output signal of scintillation detector is about 5000ppm or so when 10ms after excitation signal disappearance, i.e., should
Twilight sunset value of the scintillation detector in excitation signal disappearance 10ms is 0.5% or so.It is different even if scintillation detector type is identical
The twilight sunset value difference of the scintillation detector of producer's production is not very big, and different probe units also has respective twilight sunset value.
In using the continuous x-ray source of beam out or the inspection system of isotope radioactive source, the scintillator of scintillation detector
Twilight sunset be influence final performance index an important factor for.When analyte is thicker, the radiation attenuation from radiographic source
To one thousandth hereinafter, and twilight sunset value may be several times as much as the transmitted intensity value, and the twilight sunset value of different probe units is different, leads
It causes image light and shade irregular, causes false signal.
Fig. 1 is the scan image formed according to the detectable signal of CsI (Tl) detector.It will be noted from fig. 1 that identical
Steel plate thickness under, the right is brighter than the left side, and the twilight sunset value of different detectors is different, the cross for causing image to have light and shade different
Item.
Fig. 2 is the scan image formed according to the detectable signal of wolframic acid cadmium detector.The scan image is compared to described in Fig. 1
Scan image it is cleaner and tidier clear.Wherein, cadmium tungstate is a kind of scintillation detector material that scintillation properties are excellent, persistence
Short, twilight sunset value is low.
Fig. 3 is the output phase of CsI (Tl) detector before and after excitation signal disappears to intensity curve (fine line) and cadmium tungstate
Contrast schematic diagram of the output phase of detector to intensity curve (heavy line).Fig. 3 is represented with the high twilight sunset of CsI (Tl) detector
Detector and wolframic acid cadmium detector are the twilight sunset comparing result of the low twilight sunset detector of representative.When -10ms arrives 0ms in Fig. 3, there is work
CsI (Tl) detector and wolframic acid cadmium detector are exposed to for the X-ray beam of excitation signal.After 0ms, no X-ray beam exposes to CsI
(Tl) detector and wolframic acid cadmium detector.Therefore, after 0ms CsI (Tl) detector and wolframic acid cadmium detector output relative intensity
Curve values respectively represent respective twilight sunset value.
There are mainly two types of for the irregular method of image light and shade caused by solving because of twilight sunset phenomenon:
A kind of method is the sensitive volume using the scintillation material of low twilight sunset as scintillation detector, but such scintillation material
General sensitivity is lower and price is higher.
Another method is to be corrected for the twilight sunset of scintillation detector to the output signal of scintillation detector.This method
It measures firstly the need of the twilight sunset to scintillation detector, is then detained in the testing result of scintillation detector according to algorithm routine
Except twilight sunset influences, device performance is surveyed so as to improve visiting to flash.
When being measured to the twilight sunset of scintillation detector, when need to measure some after thoroughly breaking X-ray (or gamma ray)
Between section, such as the twilight sunset value of 1ms, 5ms, 10ms.In order to which the twilight sunset to scintillation detector measures, it is desirable to provide reliable, easy
With the twilight sunset detection device and twilight sunset detection method with low cost.
General twilight sunset detection method is to irradiate scintillation detector using radiographic source, and the data for carrying out the scintillation detector are adopted
Collection after breaking beam, continues to keep acquiring certain time to the data of the detector, obtains the twilight sunset data of the detector.
Radiographic source can be electron accelerator, isotopic source, X-ray tube etc..
Electron accelerator is expensive, power consumption is big, it is difficult to promote the use of.Isotopic source always exists gamma beam, deposits
In safety issue.X-ray tube is small in size, easy to use, and energy range generally continuously goes out from tens kilovolts to several hundred kilovolts
The x-ray source of beam, if the radiographic source as twilight sunset detection, there is certain advantage.
But detected as twilight sunset using X-ray tube radiographic source when, after cutting off the power supply of X-ray tube, X-ray tube still can
X-ray is issued, i.e., remaining X-ray, remaining X-ray has adverse effect twilight sunset detection.The remnants X-ray intensity and average
X-ray photon energy all reduces at any time, substantially exponentially decays at any time.The X-ray tube remnants X-ray intensity of different model
Difference, the intensity of remaining X-ray of the typical X-ray tube after power remove 10ms can achieve X-ray tube power supply and opens
40% of X-ray intensity when opening, the average energy of X-ray decay to 50% or so (different factories when X-ray tube electric power starting
Family, different model have biggish difference).
In order to reduce the adverse effect that the remaining X-ray of X-ray tube detects twilight sunset, in the relevant technologies known for inventor
In, when carrying out twilight sunset detection as radiographic source using X-ray tube, mating setting heavy metal block is needed under normal conditions.Shutdown X is penetrated
It when the power supply of spool, is quickly moved to heavy metal block between X-ray tube and detected detector, blocks remaining X-ray, so that
Twilight sunset test result is influenced from remaining X-ray.In order to block remaining X-ray in time, which needs high-speed mobile simultaneously
Need to be static as early as possible, so that heavy metal block be needed to have biggish acceleration, therefore also need a set of complex, higher cost tune
Save the control system and mechanical system of heavy metal block position.Currently, being detected due to needing to be arranged heavy metal block using X-ray tube
Afterglow of scintillation detector only uses in laboratory or workshop, it is difficult to use at product scene.
Utility model content
The purpose of this utility model is that realizing using X-ray tube as radiographic source with simple, reliable twilight sunset detection dress
It sets.
The utility model first aspect provides a kind of twilight sunset detection device, comprising: X-ray tube is used for emitting x-ray；
First reading circuit, for connecting with detected detector, when detection, the detected detector was set to the X-ray tube
Beam side is out to receive the X-ray beam radiation, and exports the first detectable signal to first reading circuit, and described first reads
Circuit forms according to first detectable signal and exports the first measuring signal；Remaining ray detector is set to the X-ray
Pipe goes out beam side；Second reading circuit is connect with the remaining ray detector, and the remnants ray detector receives the X
Beam radiation simultaneously exports the second detectable signal to second reading circuit, and second reading circuit is visited according to described second
Signal is surveyed to be formed and export the second measuring signal；Computing device, with first reading circuit and second reading circuit point
Level signal connection is to receive first measuring signal and second measuring signal, and the computing device is according to the shutdown X
First measuring signal and second measuring signal after the power supply of ray tube calculate and export twilight sunset detection signal.
In some embodiments, the computing device is the according to a certain moment after the power supply for turning off the X-ray tube
The value that the value of one measuring signal subtracts the second measuring signal described in the moment detects the value of signal as the twilight sunset at the moment；
Alternatively, the value of the computing device first measuring signal according to a certain moment after the power supply for turning off the X-ray tube subtracts
Value of the correction value of second measuring signal described in the moment as the twilight sunset detection signal at the moment.
In some embodiments, output relative intensity of the remaining ray detector after excitation signal disappearance when 10ms
Value is lower than 0.05% in the presence of excitation signal.
In some embodiments, the remaining ray detector includes wolframic acid cadmium detector.
In some embodiments, the twilight sunset detection device further includes heavy sheet metal, and the heavy sheet metal is set to the X
Going out beam side and being located between the X-ray tube and the detected detector and the remaining ray detector for ray tube, is used
In the intensity for the X-ray beam of decaying.
It is visited using X-ray tube as radiographic source using remaining ray based on twilight sunset detection device provided by the utility model
Remaining X-ray beam intensity after surveying the power supply of device detection shutdown X-ray tube is being originated from the first measurement letter for being detected detector 10
The influence for being originated from the second measuring signal relevant to remaining X-ray beam of remaining ray detector is deducted in number, is detected
The accurate twilight sunset of detector 10 detects signal.The twilight sunset detection device is easy, reliable.Since no setting is required in X
The heavy metal block of remaining X-ray beam is blocked after the power remove of ray tube, can be used at x-ray inspection equipment scene.
By the detailed description referring to the drawings to the exemplary embodiment of the utility model, the utility model it is other
Feature and its advantage will become apparent.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model
It limits.In the accompanying drawings:
Fig. 1 is the scan image obtained according to the detectable signal of CsI (Tl) detector.
Fig. 2 is the scan image obtained according to the detectable signal of wolframic acid cadmium detector.
Fig. 3 is the output phase of CsI (Tl) detector before and after excitation signal disappears to intensity curve (fine line) and cadmium tungstate
Contrast schematic diagram of the output phase of detector to intensity curve (heavy line).
Fig. 4 is the schematic illustration of the twilight sunset detection device of an embodiment of the present invention.
Fig. 5 is detected the output phase of detector when showing the detection twilight sunset of the twilight sunset detection device of embodiment illustrated in fig. 4
To the output phase of intensity curve (fine line) and remaining ray detector to the schematic diagram of intensity curve (heavy line).
Fig. 6 is the schematic illustration of the twilight sunset detection device of another embodiment of the utility model.
Fig. 7 is the output Relative Dose Intensity of remnants ray detector when going out the not set heavy sheet metal in beam side of X-ray tube
Pair of the output Relative Dose Intensity curve (heavy line) of remnants ray detector when curve (fine line) and setting heavy sheet metal
Compare schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to this is practical
Novel and its application or any restrictions used.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, is fallen within the protection scope of the utility model.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
Up to the unlimited the scope of the utility model processed of formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each shown in attached drawing
The size of a part is not to draw according to actual proportionate relationship.For skill known to person of ordinary skill in the relevant
Art, method and apparatus may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as awarding
Weigh part of specification.In shown here and discussion all examples, any occurrence should be construed as merely example
Property, not as limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar
Label and letter similar terms are indicated in following attached drawing, therefore, once be defined in a certain Xiang Yi attached drawing, then with
In attached drawing afterwards do not need that it is further discussed.
In the description of the present invention, it should be understood that limiting zero using the words such as " first ", " second "
Part, it is only for convenient for distinguishing to corresponding components, there is no Stated otherwise such as, above-mentioned word there is no particular meaning,
Therefore it should not be understood as the limitation to scope of protection of the utility model.
Fig. 4 shows the schematic illustration of the twilight sunset detection device of an embodiment of the present invention.As shown in figure 4, this reality
It include X-ray tube 1, the first reading circuit 3, the remaining reading of ray detector 2, second with the twilight sunset detection device of new embodiment
Circuit 4 and computing device 5.
X-ray tube 1 is used for emitting x-ray.First reading circuit 3 is for connecting detected detector 10.Tested probing
It surveys device 10 and is set to the beam side out of X-ray tube 1 when detecting to receive the radiation of the X-ray beam, and is defeated to the first reading circuit 3
First detectable signal out.First reading circuit 3 forms according to the first detectable signal and exports the first measuring signal.Remaining ray is visited
Survey the beam side out that device 2 is set to X-ray tube 1.Second reading circuit 4 is connect with remaining ray detector 2.Remaining ray detector
2 receive X-ray beam radiation and export the second detectable signal to the second reading circuit 4.Second reading circuit 4 is believed according to the second detection
Number formed and export the second measuring signal.Computing device 5 is connected separately with the first reading circuit 3 and the second reading circuit 4.
Computing device 5 receives the first measuring signal and the second measuring signal, and according to the first measurement after the power supply of shutdown X-ray tube 1
Signal and the second measuring signal calculate and export twilight sunset detection signal.
The utility model embodiment is used as radiographic source using X-ray tube 1, detects shutdown X using remaining ray detector and penetrates
Remaining X-ray beam intensity after the power supply of spool deducts in being originated from the first measuring signal for being detected detector 10 from residual
The influence of the second measuring signal relevant to remaining X-ray beam of remaining ray detector obtains being detected detector 10 more
Accurate twilight sunset detects signal.The twilight sunset detection device is easy, reliable.It is closed since no setting is required for the power supply in X-ray tube
It has no progeny and blocks the heavy metal block of remaining X-ray beam, can be used at x-ray inspection equipment scene.
In the present embodiment, twilight sunset value of the remaining ray detector 2 after excitation signal disappearance when 10ms is lower than excitation signal
In the presence of 0.05%.Remaining ray detector 2 for example may include wolframic acid cadmium detector.The remaining ray for meeting the requirement is visited
Survey twilight sunset 1 magnitude lower than the twilight sunset of conventional detected detector 10 (such as CsI (Tl) detector) or more of device 2
It is low, at this point it is possible to directly subtract the second measuring signal from the first measuring signal, it can obtain accurate twilight sunset detection
As a result.
In the present embodiment, computing device 5 according to shutdown X-ray tube 1 power supply after a certain the first measuring signal of moment value
The value for subtracting the second measuring signal detects the value of signal as the twilight sunset at the moment.In the present embodiment, the first measuring signal is quilt
The detector for detecting detector 10 exports relative intensity, and the second measuring signal is the detector output phase of remaining ray detector 2
To intensity.
In some embodiments, computing device 5 can also be surveyed according to a certain moment first after the power supply for turning off X-ray tube 1
The correction value that the value of amount signal subtracts the second measuring signal detects the value of signal as the twilight sunset at the moment.
For example, the correction value of the second measuring signal can be the value of the second measuring signal and the product of correction factor.Example again
Such as, the correction value of the second measuring signal is the value of the second measuring signal and the difference of correction parameter.Such as in remaining X-ray detection X
In the case that the twilight sunset value of device 2 is not sufficiently low, the mode that can first pass through to obtain correction value in the second measuring signal is removed
Since the twilight sunset value bring of remaining ray detector 2 influences in second measuring signal.
The present embodiment also provides a kind of twilight sunset detection side using aforementioned twilight sunset detection device detection afterglow of scintillation detector
Method.The twilight sunset detection method includes: to open 1 power supply of X-ray tube, makes 1 emitting x-ray of X-ray tube, X is turned off after a period of time
1 power supply of ray tube；The X-ray beam that detected detector 10 receives X-ray tube 1 radiates and exports the first detectable signal；First reads
Circuit 3 receives the first detectable signal and is formed according to the first detectable signal and export the first measuring signal out；Remaining X-ray detection X
The X-ray beam that device 2 receives X-ray tube 1 radiates and exports the second detectable signal；Second reading circuit 4 receives the second detectable signal
And it is formed according to the second detectable signal and exports the second measuring signal；Control device receives the first measuring signal and the second measurement letter
Number, and according to after the power supply of shutdown X-ray tube 1 the first measuring signal and the second measuring signal calculate and export detected detection
The twilight sunset of device 10 detects signal.
The twilight sunset detection method and aforementioned twilight sunset detection device advantage having the same.
In the present embodiment, it can be subtracted according to the value of a certain the first measuring signal of moment after the power supply of shutdown X-ray tube 1
Value of the value of second measuring signal of moment as the twilight sunset detection signal at the moment.In the present embodiment, the first measuring signal is
The detector for being detected detector 10 exports relative intensity, and the second measuring signal is the detector output of remaining ray detector 2
Relative intensity.
In some embodiments, can be subtracted according to the value of a certain the first measuring signal of moment after the power supply of shutdown X-ray tube 1
Go the correction value of second measuring signal of moment as the value of the twilight sunset detection signal at the moment.For example, the second measuring signal
Correction value can be the value of the second measuring signal and the product of correction factor.For another example the correction value of the second measuring signal can also
Think the value of the second measuring signal and the difference of correction parameter.
In the present embodiment, the access of the scintillation detector as detected detector 10 first is read before twilight sunset detection starts
Circuit 3 out.Meanwhile as shown in figure 4, remaining ray detector 2 connects with the second reading circuit 4, the first reading circuit 3 and second
Reading circuit 4 is connect with computing device 5.It is detected detector 10 and remaining ray detector 2 is respectively positioned on going out for X-ray tube 1
Beam side.When detection starts, the power supply of X-ray tube 1 is opened, X-ray beam 7 is emitted from the target spot of X-ray tube 1, is radiated detected
On detector 10 and on remaining ray detector 2.The first detectable signal that first reading circuit 2 exports detected detector 10
Data acquisition is carried out, while the second detectable signal progress data that 4 pairs of the second reading circuit remaining ray detectors 2 export are adopted
Collection.(such as 10ms) turns off the power supply of X-ray tube 1 after a period of time, and X-ray tube 1 continues to issue remaining X-ray beam, is detected
Detector 10 and remaining ray detector 2 continue to test the intensity of the remaining X-ray beam of the sending of X-ray tube 1.
In the present embodiment, it is detected the first detectable signal that detector 10 exports and conduct is formed by the first reading circuit 3
The detector of first measuring signal exports relative intensity, and the second detectable signal that remaining ray detector 2 exports is read by second
Circuit 4, which is formed, out exports relative intensity as the detector of the second measuring signal.Computing device 5 receives the first measuring signal and the
After two measuring signals, the value of the second measuring signal is subtracted in the value of the first measuring signal after the power supply of shutdown X-ray tube 1,
Obtain the value of twilight sunset detection signal.The value that the twilight sunset detects signal is the relative intensity value for representing twilight sunset size.
Fig. 5 shows the output phase of the detected detector of the twilight sunset detection device of embodiment illustrated in fig. 4 to intensity curve
The schematic diagram of (fine line) and the output phase of remaining ray detector to intensity curve (heavy line).As shown in figure 5, remaining ray
The Strength Changes of the disconnected shutdown front and back X-ray beam of the power supply that the output phase of detector 2 represents X-ray tube 1 to intensity curve.Shutdown
After the power supply of X-ray tube 1, the output phase of the detected detector 10 at each time point deducts remaining X-ray detection X to intensity curve value
After the output phase of device 2 is to intensity curve value, the twilight sunset value of the various time points for being detected detector 10 has just been obtained.
Wherein, the first reading circuit 3 and the second reading circuit 4 can be used existing corresponding with detector that is being connected
Detector reading circuit.Computing device 5 can be to be various for executing the device of computing function described in the utility model, packet
Include but be not limited to computer, general processor, programmable logic controller (PLC) (PLC), digital signal processor (DSP), dedicated collection
At circuit (ASIC), field programmable gate array (FPGA) etc..
Fig. 6 shows the twilight sunset detection device schematic illustration of another embodiment of the utility model.As shown in fig. 6, this reality
With new embodiment and embodiment illustrated in fig. 4 the difference is that twilight sunset detection device further includes heavy sheet metal 8.Heavy sheet metal 8 is set
Be placed in X-ray tube 1 goes out beam side, and is located between X-ray tube 1 and detected detector 10 and remaining ray detector 2, uses
In the intensity of attenuated X-ray beams.
Fig. 7 is the output Relative Dose Intensity of remnants ray detector when going out the not set heavy sheet metal in beam side of X-ray tube
Pair of the output Relative Dose Intensity curve (heavy line) of remnants ray detector when curve (fine line) and setting heavy sheet metal
Compare schematic diagram.Wherein, when -10ms arrives 0ms, the electric power starting of X-ray tube 1,1 normal transmission ray of X-ray tube；After 0ms, X is penetrated
The power supply of spool 1 is turned off, and still has remaining X-ray beam to issue, and the dose intensity of the remnants X-ray beam successively decreases at any time.This reality
It applies in example, heavy sheet metal 8 is the steel plate with a thickness of 4mm for going out beam side that X-ray tube 1 is arranged in.As shown in fig. 7, installing a huge sum of money additional
After belonging to piece 8, the strength retrogression of remaining X-ray beam is faster.
Sheet metal is aggravated in going out between the setting of beam side and detected detector 10 and remaining ray detector for x-ray source 1
8, low energy X ray photon reaches the probability for being detected detector 10 and remaining ray detector 2 in relative reduction X-ray beam,
It is residual by improving to the opposite intensity reduced remaining X-ray beam arrival and be detected detector 10 and remaining ray detector 2
The attenuation degree of remaining X-ray beam reduces the influence that remaining X-ray detects twilight sunset, conducive to the accuracy for improving detection.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System；Although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or is equally replaced to some technical characteristics
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (5)
1. a kind of twilight sunset detection device characterized by comprising
X-ray tube (1) is used for emitting x-ray；
First reading circuit (3), for connect with detected detector (10), when detection, the detected detector (10) was arranged
Go out beam side in the X-ray tube (1) to receive the X-ray beam radiation, and exports first to first reading circuit (3)
Detectable signal, first reading circuit (3) form according to first detectable signal and export the first measuring signal；
Remaining ray detector (2), be set to the X-ray tube (1) goes out beam side；
Second reading circuit (4) is connect with the remaining ray detector (2), described in remnants ray detector (2) receiving
X-ray beam radiation simultaneously exports the second detectable signal to second reading circuit (4), and second reading circuit (4) is according to institute
The second detectable signal is stated to be formed and export the second measuring signal；
Computing device (5) is connected separately with first reading circuit (3) and second reading circuit (4) to receive
First measuring signal and second measuring signal, the computing device (5) is according to the electricity for turning off the X-ray tube (1)
First measuring signal and second measuring signal behind source calculate and export twilight sunset detection signal.
2. twilight sunset detection device according to claim 1, which is characterized in that
The value of the computing device (5) first measuring signal according to a certain moment after the power supply for turning off the X-ray tube (1)
The value for subtracting the second measuring signal described in the moment detects the value of signal as the twilight sunset at the moment；Alternatively,
The value of the computing device (5) first measuring signal according to a certain moment after the power supply for turning off the X-ray tube (1)
The correction value for subtracting the second measuring signal described in the moment detects the value of signal as the twilight sunset at the moment.
3. twilight sunset detection device according to claim 1, which is characterized in that the remnants ray detector (2) is exciting
Output relative intensity value after blackout when 10ms is lower than 0.05% in the presence of excitation signal.
4. twilight sunset detection device according to claim 1, which is characterized in that the remnants ray detector (2) includes tungsten
Sour cadmium detector.
5. twilight sunset detection device according to claim 1, which is characterized in that the twilight sunset detection device further includes heavy metal
Piece (8), the heavy sheet metal (8) are set to going out beam side and being located at the X-ray tube (1) and the quilt for the X-ray tube (1)
It detects between detector (10) and the remaining ray detector (2), the intensity for the X-ray beam of decaying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820684880.2U CN208283569U (en) | 2018-05-09 | 2018-05-09 | Twilight sunset detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820684880.2U CN208283569U (en) | 2018-05-09 | 2018-05-09 | Twilight sunset detection device |
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| CN208283569U true CN208283569U (en) | 2018-12-25 |
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| CN201820684880.2U Withdrawn - After Issue CN208283569U (en) | 2018-05-09 | 2018-05-09 | Twilight sunset detection device |
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| CN (1) | CN208283569U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535770A (en) * | 2018-05-09 | 2018-09-14 | 同方威视技术股份有限公司 | Twilight sunset detection device and twilight sunset detection method |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535770A (en) * | 2018-05-09 | 2018-09-14 | 同方威视技术股份有限公司 | Twilight sunset detection device and twilight sunset detection method |
| CN108535770B (en) * | 2018-05-09 | 2024-01-02 | 同方威视技术股份有限公司 | Afterglow detection device and afterglow detection method |
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