CN116559209A - Neutron photography method and system - Google Patents
Neutron photography method and system Download PDFInfo
- Publication number
- CN116559209A CN116559209A CN202310490757.2A CN202310490757A CN116559209A CN 116559209 A CN116559209 A CN 116559209A CN 202310490757 A CN202310490757 A CN 202310490757A CN 116559209 A CN116559209 A CN 116559209A
- Authority
- CN
- China
- Prior art keywords
- neutron
- image
- corrected
- fluence
- fluence rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000010606 normalization Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 29
- 238000002601 radiography Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims description 2
- 238000012937 correction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000001186 cumulative effect Effects 0.000 description 7
- 230000008439 repair process Effects 0.000 description 5
- 238000007405 data analysis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004992 fission Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/05—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using neutrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/03—Investigating materials by wave or particle radiation by transmission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/40—Imaging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention provides a neutron photographing method and a neutron photographing system. The neutron photographing method comprises the steps of obtaining images to be corrected obtained through neutron photographing and neutron fluence rate in the neutron photographing period, wherein at least two images to be corrected are obtained, and the neutron fluence rate corresponds to the images to be corrected one by one; and carrying out normalization processing on the image to be corrected according to the neutron fluence rate. The neutron photographing system comprises a neutron source, an image acquisition device and at least one fluence rate measuring instrument. The neutron source is configured to release a neutron beam within the beam space; the image acquisition device is configured to acquire neutrons and generate an image to be corrected; the fluence rate measuring instrument is arranged between the neutron source and the image acquisition device and is used for measuring the neutron fluence rate of the neutron beam. According to the neutron photographing method and system, the neutron fluence rate is obtained, the image to be corrected is subjected to normalization correction processing, the problem of image data distortion caused by strong fluctuation of a neutron source is reduced, and the effect of improving the image quality of neutron photographing is achieved.
Description
Technical Field
The invention relates to the technical field of neutron application, in particular to a neutron photographing method and a neutron photographing device.
Background
Neutron photography is a technique for realizing imaging by utilizing a neutron beam emitted by a neutron source, and is widely applied to the industrial field. When a neutron photographing technology is adopted in an image acquisition link of nondestructive testing analysis such as quantitative analysis and tomography, a plurality of pieces of image data need to be acquired. Since the exposure time of a single image for neutron photography is long, short for several seconds and long for several minutes, when the image data to be acquired increases, the cumulative exposure time continues to increase. In the period of time, the fluctuation of the neutron source intensity causes larger gray value difference of the acquired multiple pieces of image data, and if the series of image data are directly applied, quantitative analysis results are wrong or three-dimensional reconstruction results are poor.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a neutron photographing method and system that overcomes or at least partially solves the above problems, and aims to solve the problem of image data distortion caused by strong fluctuation of neutron sources, thereby achieving the purpose of improving the image quality of neutron photographing.
Specifically, the invention provides the following technical scheme:
a neutron photographing method, comprising:
obtaining images to be corrected obtained through neutron photography and neutron fluence rates during the neutron photography, wherein the images to be corrected are at least two, and the neutron fluence rates correspond to the images to be corrected one by one;
and carrying out normalization processing on the image to be corrected according to the neutron fluence rate.
Optionally, the method for normalizing the image to be corrected according to the neutron fluence rate includes:
integrating the neutron fluence rate in each neutron photographing period to obtain accumulated neutron fluence corresponding to the neutron photographing period;
selecting the image to be corrected corresponding to the accumulated neutron fluence as a normalized value image;
and carrying out normalization processing on each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected.
Optionally, the method for selecting the image to be corrected corresponding to the accumulated neutron fluence includes:
integrating the neutron fluence rate in each neutron photographing period to obtain accumulated neutron fluence corresponding to the neutron photographing period;
and responding to at least three images to be corrected, sorting the accumulated neutron fluence according to the size, and acquiring the images to be corrected corresponding to the accumulated neutron fluence at the intermediate value as normalized value images.
Optionally, the method for selecting the image to be corrected corresponding to the accumulated neutron fluence includes:
comparing the magnitude of each accumulated neutron fluence in response to the two neutron photographing periods to obtain the image to be corrected corresponding to the smallest accumulated neutron fluence as a normalized value image;
and carrying out normalization processing on each image to be corrected based on the normalized value image.
Optionally, the method for normalizing each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected includes:
taking the accumulated neutron fluence corresponding to the normalized value image as a normalized value;
and calculating each image to be corrected according to the relative value of each accumulated neutron fluence relative to the normalization value in a pixel-by-pixel mode.
Optionally, the method for acquiring the image to be corrected obtained by neutron photography and the neutron fluence rate during neutron photography comprises the following steps:
acquiring a beam space of neutron source radiation;
and adjusting the position of the fluence rate measuring instrument at the edge of the beam space until the sampling value of the neutron fluence rate and the image quality of the image to be corrected reach preset conditions.
Optionally, the method for acquiring the image to be corrected obtained by neutron photography and the neutron fluence rate during neutron photography comprises the following steps:
synchronizing the acquisition time of the image to be corrected and the acquisition time of the neutron fluence rate so as to acquire the neutron fluence rate within the acquisition time of the image to be corrected.
In another aspect, the present invention also provides a neutron radiography system including a neutron source, an image acquisition device, and at least one fluence rate measurement instrument. The neutron source is configured to release a neutron beam within a beam space; the image acquisition device is configured to acquire neutrons and generate an image to be corrected; the fluence rate measuring instrument is arranged between the neutron source and the image acquisition device and is used for measuring the neutron fluence rate of the neutron beam.
Optionally, the fluence rate measurement is at an edge of the beam space.
Optionally, the neutron photographing system further comprises a control device, wherein the control device is connected with the image acquisition device and the fluence rate measuring instrument and is configured to:
responding to the control device comprising different control units connected with the image acquisition device and the fluence rate measuring instrument, synchronizing the data acquisition time of each control unit, and acquiring the neutron fluence rate in the acquisition time of the image to be corrected; or alternatively
The control device comprises the same control unit connected with the image acquisition device and the fluence rate measuring instrument.
According to the technical scheme, the neutron fluence rate during neutron photography is obtained while the image to be corrected is obtained through neutron photography, the fluctuation condition of the neutron source intensity is reflected through the neutron fluence rate, the image to be corrected is subjected to normalization correction processing, the problem of image data distortion caused by the fluctuation of the neutron source intensity is reduced, and the effect of improving the image quality of neutron photography is achieved.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a flow chart of a neutron radiography method according to one embodiment of the invention;
FIG. 2 is a flow chart of a method of normalizing an image to be corrected according to neutron fluence rate in accordance with an embodiment of the invention;
FIG. 3 is a flow chart of a method for normalizing each image to be corrected based on normalized value images and accumulated neutron fluence corresponding to each image to be corrected, according to an embodiment of the invention;
FIG. 4 is a flow chart of a method of acquiring a neutron fluence rate during neutron radiography and an image to be corrected taken in neutron radiography, in accordance with an embodiment of the invention;
FIG. 5 is a schematic diagram of integrating neutron fluence rates to obtain cumulative neutron fluence, according to an embodiment of the invention;
FIG. 6 is a schematic block diagram of a neutron radiography system of one embodiment of the invention.
Detailed Description
The neutron photographing method and system of the embodiment of the present invention are described below with reference to fig. 1 to 6. In the description of the present embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature, i.e. one or more such features. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.
Unless specifically stated or limited otherwise, the terms "disposed," "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be connected, either permanently or removably, or integrally; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present invention as the case may be.
Furthermore, in the description of the present embodiments, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature therebetween. That is, in the description of the present embodiment, the first feature being "above", "over" and "upper" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature "under", "beneath", or "under" a second feature may be a first feature directly under or diagonally under the second feature, or simply indicate that the first feature is less level than the second feature.
In the description of the present embodiment, a description referring to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
FIG. 1 is a flow chart of a neutron photographing method according to one embodiment of the invention, and a detailed description of the neutron photographing method and the neutron photographing system of the neutron photographing method of the present application is provided below in conjunction with FIGS. 1-6.
As shown in fig. 1, the neutron photographing method of one embodiment of the present invention includes:
s100, obtaining images to be corrected obtained through neutron photography and neutron fluence rates during the neutron photography, wherein at least two images to be corrected are obtained, and the neutron fluence rates correspond to the images to be corrected one by one;
and S200, carrying out normalization processing on the image to be corrected according to the neutron fluence rate.
The exposure time of a single image of the neutron camera is longer, and when the image data required to be acquired is increased, the accumulated exposure time can be continuously prolonged. In general, the neutron source 1 can be regarded as a stable source in a short time, but as the cumulative exposure time increases, the influence of strong fluctuation of the neutron source 1 must be considered. In order to reduce the influence, the invention provides recording the change condition of the neutron fluence rate in the process of the neutron photographing, and then correcting the image by utilizing the fluctuation of the neutron fluence rate. Specifically, in this embodiment, the neutron fluence rate is acquired while the image to be corrected is obtained by neutron photography. An object of the present embodiment is to correct the case where image data generated for a plurality of images to be corrected due to strong fluctuation of the neutron source 1 is inconsistent, that is, to correct the image data of a plurality of images to be corrected to simulate an image formed in the case of the same or a certain stable neutron source 1 according to the difference of the corresponding neutron fluence rates. Therefore, after the neutron fluence rate in the neutron photographing period is obtained, the image to be corrected can be normalized according to different neutron fluence rates corresponding to different images to be corrected, so that the problem of image data distortion caused by strong fluctuation of the neutron source 1 is reduced, and the effect of improving the image quality of the neutron photographing is achieved.
In some embodiments of the neutron photographing method of the present invention, as shown in fig. 2, the method for normalizing the image to be corrected according to the neutron fluence rate includes:
s210, integral calculation is carried out on the neutron fluence rate in each neutron photographing period to obtain an accumulated neutron fluence J corresponding to the neutron photographing period i ；
S220, selecting an image to be corrected corresponding to the accumulated neutron fluence as a normalized value image;
s230, carrying out normalization processing on each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected.
In this embodiment, as shown in FIG. 5In fig. 5, the horizontal axis represents time, and the vertical axis represents the obtained neutron fluence rate. The strong fluctuations of the neutron source 1 are usually irregular fluctuations, which manifest mainly irregular fluctuations of the neutron fluence rate over time. In order to reflect the neutron fluence rate in the exposure time as a whole, it is necessary to integrate the neutron fluence rate with time to obtain an integrated neutron fluence. For example, one of the neutrons has an exposure time of a starting time T S1 Ending time T e1 Cumulative neutron fluence J 1 As an integral of neutron fluence rate with time, i.e. the horizontal axis of coordinates vs. T in FIG. 5 S1 、T e1 And the area surrounded by the neutron fluence rate. The accumulated neutron fluence can greatly influence the gray value of the image to be corrected, and the total gray value of the image to be corrected formed by photographing under different accumulated neutron fluence is different under the condition that the photographing sample 3 is unchanged and the exposure time is the same. In general, the gray value of the image to be corrected is proportional to the accumulated neutron fluence. Therefore, one of the images to be corrected is selected as a normalized value image, and based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected, normalization processing can be performed on each image to be corrected, so as to correct the influence of fluctuation of the accumulated neutron fluence on the neutron photographic image. Specifically, the cumulative neutron fluence corresponding to the normalized value image is set to be normalized value J s The gray value of each image to be corrected is f i The accumulated neutron fluence corresponding to each image to be corrected is J i Then the formula for normalization is:
f i repair = f i *J i /J s
In the above, f i And trimming to be the gray value of the image after normalization processing. For example, one of the normalized image gray values f 1 Repair = f 1 *J 1 /J s 。
In some embodiments of the neutron photographing method of the present invention, the method for normalizing the image to be corrected according to the neutron fluence rate includes:
s240, in response to using two or more fluence rate measurement apparatuses 2, each fluence rate measurement apparatus 2 measures neutron fluence at a locationThe rate, the neutron fluence rate obtained by each fluence rate measuring instrument 2 in each neutron photographing period is integrated and calculated, and a plurality of integral values in the same neutron photographing period are added to obtain an accumulated neutron fluence J corresponding to the neutron photographing period i ；
S220, selecting an image to be corrected corresponding to the accumulated neutron fluence as a normalized value image;
s230, carrying out normalization processing on each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected.
In this embodiment, a plurality of fluence rate measuring instruments 2 are adopted, and the neutron fluence rates acquired by each fluence rate measuring instrument 2 are integrated and added, so that the acquired accumulated neutron fluence can more accurately reflect the accumulated neutron fluence at the position of the sample 3 or in the middle of the neutron beam, and the accuracy of correcting the image to be corrected is further improved.
In some embodiments of the neutron photographing method of the present invention, the method for selecting an image to be corrected corresponding to the accumulated neutron fluence includes:
s221, responding to at least three images to be corrected, sorting all accumulated neutron fluence according to the size, and acquiring the images to be corrected corresponding to the accumulated neutron fluence at the intermediate value as normalized value images.
In neutron radiography, the obtained image to be corrected sometimes generates overexposure or underexposure due to fluctuation of the cumulative neutron fluence, that is, the image to be corrected of abnormal exposure does not accurately reflect the cumulative neutron fluence. When the image to be corrected of exposure abnormality is taken as a normalized value image, adverse effects are generated on normalization processing of all the images to be corrected. In this embodiment, in order to avoid or reduce this situation, the accumulated neutron fluence at the intermediate value is selected from the accumulated neutron fluence, and the image to be corrected corresponding to the accumulated neutron fluence is used as the normalized value image, where the gray value of the normalized value image can better reflect the corresponding accumulated neutron fluence. When other images to be corrected are normalized based on the method, more accurate images can be obtained.
In some embodiments of the neutron photographing method of the present invention, the method for selecting an image to be corrected corresponding to the accumulated neutron fluence includes:
s222, in response to the fact that the neutron photographing period is two, comparing the magnitude of each accumulated neutron fluence, and taking an image to be corrected corresponding to the smallest accumulated neutron fluence as a normalized value image.
In this embodiment, when two images to be corrected are obtained by taking a picture with a neutron, a corresponding image to be corrected with a smaller accumulated neutron fluence is selected as the normalized image. The fluctuation of the neutron fluence rate corresponding to the smaller accumulated neutron fluence is generally smaller, and compared with the larger accumulated neutron fluence, the image to be corrected corresponding to the smaller accumulated neutron fluence can better reflect the strong neutron fluence rate of the neutron source 1 which is in a stable state. And taking the corresponding image to be corrected with smaller accumulated neutron fluence as a normalized value image, and carrying out normalization processing on other images to be corrected based on the normalized value image to obtain a more accurate image.
In some embodiments of the neutron photographing method of the present invention, as shown in fig. 3, the method for normalizing each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected includes:
s231 takes the accumulated neutron fluence corresponding to the normalized value image as a normalized value;
s232, calculating each image to be corrected according to the relative value of each accumulated neutron fluence relative to the normalized value in a pixel-by-pixel mode.
In this embodiment, according to the current neutron photography technique, each pixel of the obtained image to be corrected is generally proportional to the accumulated neutron fluence at the sample 3 or in the middle of the neutron beam corresponding to that pixel, and the accumulated neutron fluence at the sample 3 or in the middle of the neutron beam is proportional to the accumulated neutron fluence, so that the gray value f for each pixel of the image to be corrected i Normalized correction f of (2) i repair The following direct treatment can be used:
f i repair ＝f i *J i /J s
In the above, f i repair For after normalization treatmentGray value, J, of each pixel of the image s To be normalized value, f i For the gray value of each pixel of the image to be corrected, J i And the accumulated neutron fluence corresponding to the image to be corrected.
In some embodiments of the neutron photographing method of the present invention, as shown in fig. 4 and 6, the method of acquiring an image to be corrected obtained by neutron photographing and a neutron fluence rate during neutron photographing includes:
s111, acquiring a beam space irradiated by a neutron source 1;
s112, adjusting the position of the fluence rate measuring instrument 2 at the edge of the beam space until the sampling value of the neutron fluence rate and the image quality of the image to be corrected reach preset conditions.
The neutron fluence rate acquisition requires arranging a fluence rate measuring instrument 2, and the position of the fluence rate measuring instrument 2 has a significant influence on measurement accuracy, and the fluence rate measuring instrument 2 also affects the quality of neutron beam current, thereby affecting the quality of neutron photographic images. In the present embodiment, in order to secure both the measurement accuracy of the neutron fluence rate and the neutron photographic image quality, the fluence rate measurement instrument 2 is arranged at the beam edge used for neutron photography. The specific location of the fluence rate measurement instrument 2 provides for multiple attempted determinations such that the neutron fluence rate at that location is proportional to the neutron fluence rate at the sample 3 or in the middle of the neutron beam. For example, before neutron photographing, a fluence rate measuring instrument 2 is respectively arranged at the beam edge and the beam middle part to measure neutron fluence rate sampling values of a plurality of exposure times, and whether the neutron fluence rate sampling values are in direct proportion to the sampling values measured at the beam edge and the sampling values measured at the beam middle part is compared. If not, the position of the fluence rate measurement instrument 2 at the beam edge is changed multiple times until the two are proportional. Therefore, the measurement data of the fluence rate measuring instrument 2 can be ensured to accurately reflect the neutron fluence rate at the position of the sample 3 or in the middle of the neutron beam, and an accurate basis is provided for subsequent data correction. On the other hand, after the fluence rate measuring apparatus 2 and the sample 3 are arranged, test photographing can be performed first, whether the image quality of the acquired image to be corrected reaches a preset condition is checked, if the image quality reaches the preset condition, it is indicated that the fluence rate measuring apparatus 2 has a large influence on the image to be corrected, and the position of the fluence rate measuring apparatus 2 needs to be further adjusted, so that the influence on the image to be corrected is reduced.
In some embodiments of the neutron photographing method of the present invention, a method of acquiring an image to be corrected obtained by neutron photographing and a neutron fluence rate during neutron photographing includes:
s121, synchronizing the acquisition time of the image to be corrected and the acquisition time of the neutron fluence rate so as to acquire the neutron fluence rate in the acquisition time of the image to be corrected.
In this embodiment, in order to enable the neutron fluence rate acquired by the fluence rate measurement apparatus 2 to accurately reflect the image to be corrected, it is necessary to synchronize the time of the fluence rate measurement apparatus 2 with the time of the image acquisition apparatus 4. Specifically, one synchronization manner is to turn on and off the fluence rate measurement instrument 2 and the image pickup device 4 simultaneously, ensuring that the start time and end time of exposure of each image to be corrected coincide with the start time and end time of the acquired neutron fluence rate. In another synchronization manner, the fluence rate measuring apparatus 2 is in a continuously opened state, the image acquisition device 4 records a start time and an end time of exposure each time, and then intercepts measurement data of fluence rate measurement in the start time and the end time.
In some embodiments of the neutron radiography system of the invention, as shown in fig. 6, the neutron radiography system comprises a neutron source 1, an image acquisition device 4 and at least one fluence rate measurement instrument 2. The neutron source 1 is configured to release a neutron beam in a beam space; the image acquisition device 4 is configured to acquire neutrons and generate an image to be corrected; the fluence rate measuring instrument 2 is provided between the neutron source 1 and the image acquisition device 4, and is used for measuring the neutron fluence rate of the neutron beam.
In this embodiment, when the neutron photographing system is used for monitoring the neutron source 1, the fluence rate measuring apparatus 2 is only required to be arranged between the neutron source 1 and the image acquisition device 4. When the neutron photographing system is used for non-destructive photographing of a sample 3, as shown in fig. 6, the sample 3 is placed between the neutron source 1 and the image acquisition device 4, and the fluence rate measurement instrument 2 is placed between the neutron source 1 and the sample 3, so that the neutron fluence rate at the position of the fluence rate measurement instrument 2 is proportional to the neutron fluence rate at the sample 3. In this embodiment, the fluence rate measuring apparatus 2 may be selected as a long counter or a fission ionization chamber, and the measurement accuracy of the long counter or the fission ionization chamber for the neutron fluence rate is high, so that the correction accuracy of the image to be corrected by using the neutron fluence rate can be improved.
In some embodiments of the neutron camera system of the invention, as shown in fig. 6, the fluence rate measurement instrument 2 is at the edge of the beam space. In the present embodiment, when the sample 3 is large in size, the fluence rate measurement instrument 2 affects the quality of the neutron beam, and thus the quality of the neutron photographic image, and therefore, the fluence rate measurement instrument 2 is disposed at the edge of the beam space to reduce the effect on the quality of the neutron photographic image.
In some embodiments of the neutron photographing system of the invention, the neutron photographing system further comprises a control device which is connected to the image acquisition device 4 and the fluence rate measurement instrument 2 and is configured to:
in response to the control device including different control units connected to the image acquisition device 4 and the fluence rate measurement instrument 2, the data acquisition times of the control units are synchronized to acquire the neutron fluence rate within the acquisition time of the image to be corrected.
In this embodiment, the control device is a computer, the first computer is connected to the image acquisition device 4, controls the image acquisition device 4, and acquires data of the image acquisition device 4, and the computer can also be used for performing data analysis on the image data. The second computer is connected with the image acquisition device 4, the computer is synchronous with the time of the first computer, the second computer controls the fluence rate measuring instrument 2, and the data of the fluence rate measuring instrument 2 are acquired.
In some embodiments of the neutron photographing system of the invention, the neutron photographing system further comprises a control device which is connected to the image acquisition device 4 and the fluence rate measurement instrument 2 and is configured to:
the control device comprises the same control unit connected with the image acquisition device 4 and the fluence rate measuring instrument 2.
In this embodiment, the control device is a computer, and the computer is connected to the image acquisition device 4, controls the image acquisition device 4, and acquires data of the image acquisition device 4, and may also be used for performing data analysis on the image data. The computer is also connected with an image acquisition device 4 for controlling the fluence rate measuring instrument 2 and acquiring data of the fluence rate measuring instrument 2.
In some embodiments of the neutron camera system of the invention, as shown in fig. 6, there are two fluence meters 2, each fluence meter 2 being at a different location of the neutron beam. There may be inconsistency in the fluctuation of the neutron fluence rate around the neutron beam, and when the fluence rate measuring apparatus 2 is one, the fluctuation of the neutron fluence rate at the position of the fluence rate measuring apparatus 2 may be inconsistent with the fluctuation of the neutron fluence rate at the sample 3 or the middle of the neutron beam, thereby causing that the normalized value cannot accurately reflect the accumulated neutron fluence at the sample 3 or the middle of the neutron beam. To solve this problem, in this embodiment, two fluence rate measurement apparatuses 2 are adopted, each fluence rate measurement apparatus 2 is located at a different position of the neutron beam, so that the neutron fluence rate obtained by the fluence rate measurement apparatus 2 can more accurately reflect the neutron fluence rate at the sample 3 or in the middle of the neutron beam, and the accuracy of correction of the image to be corrected is further improved.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
Claims (10)
1. A neutron photographing method, comprising:
obtaining images to be corrected obtained through neutron photography and neutron fluence rates during the neutron photography, wherein the images to be corrected are at least two, and the neutron fluence rates correspond to the images to be corrected one by one;
and carrying out normalization processing on the image to be corrected according to the neutron fluence rate.
2. The neutron photographing method of claim 1, wherein the steps of,
and normalizing the image to be corrected according to the neutron fluence rate, wherein the normalizing comprises the steps of:
integrating the neutron fluence rate in each neutron photographing period to obtain accumulated neutron fluence corresponding to the neutron photographing period;
selecting the image to be corrected corresponding to the accumulated neutron fluence as a normalized value image;
and carrying out normalization processing on each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected.
3. The neutron photographing method of claim 2, wherein the steps of,
the selecting the image to be corrected corresponding to the accumulated neutron fluence comprises the following steps:
and responding to at least three images to be corrected, sorting the accumulated neutron fluence according to the size, and acquiring the images to be corrected corresponding to the accumulated neutron fluence at the intermediate value as normalized value images.
4. The neutron photographing method of claim 2, wherein the steps of,
the selecting the image to be corrected corresponding to the accumulated neutron fluence comprises the following steps:
comparing the magnitude of each accumulated neutron fluence in response to the two neutron photographing periods to obtain the image to be corrected corresponding to the smallest accumulated neutron fluence as a normalized value image;
and carrying out normalization processing on each image to be corrected based on the normalized value image.
5. The neutron photographing method of claim 2, wherein the steps of,
the normalizing process for each image to be corrected based on the normalized value image and the accumulated neutron fluence corresponding to each image to be corrected comprises the following steps:
taking the accumulated neutron fluence corresponding to the normalized value image as a normalized value;
and calculating each image to be corrected according to the relative value of each accumulated neutron fluence relative to the normalization value in a pixel-by-pixel mode.
6. The neutron photographing method of claim 1, wherein the steps of,
the method for acquiring the image to be corrected obtained by neutron photography and the neutron fluence rate during the neutron photography comprises the following steps:
acquiring a beam space of neutron source radiation;
and adjusting the position of the fluence rate measuring instrument at the edge of the beam space until the sampling value of the neutron fluence rate and the image quality of the image to be corrected reach preset conditions.
7. The neutron photographing method of claim 1, wherein the steps of,
the method for acquiring the image to be corrected obtained by neutron photography and the neutron fluence rate during the neutron photography comprises the following steps:
synchronizing the acquisition time of the image to be corrected and the acquisition time of the neutron fluence rate so as to acquire the neutron fluence rate within the acquisition time of the image to be corrected.
8. A neutron radiography system, comprising:
a neutron source configured to release a neutron beam within a beam space;
the image acquisition device is configured to acquire neutrons and generate an image to be corrected;
and the fluence rate measuring instrument is arranged between the neutron source and the image acquisition device and is used for measuring the neutron fluence rate of the neutron beam.
9. The neutron imaging system of claim 8, wherein the neutron imaging system comprises,
the fluence rate measurement instrument is located at an edge of the beam space.
10. The neutron radiography system of claim 8, further comprising:
the control device is connected with the image acquisition device and the fluence rate measuring instrument and is configured to:
responding to the control device comprising different control units connected with the image acquisition device and the fluence rate measuring instrument, synchronizing the data acquisition time of each control unit, and acquiring the neutron fluence rate in the acquisition time of the image to be corrected; or alternatively
The control device comprises the same control unit connected with the image acquisition device and the fluence rate measuring instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310490757.2A CN116559209A (en) | 2023-04-28 | 2023-04-28 | Neutron photography method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310490757.2A CN116559209A (en) | 2023-04-28 | 2023-04-28 | Neutron photography method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116559209A true CN116559209A (en) | 2023-08-08 |
Family
ID=87499380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310490757.2A Pending CN116559209A (en) | 2023-04-28 | 2023-04-28 | Neutron photography method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116559209A (en) |
-
2023
- 2023-04-28 CN CN202310490757.2A patent/CN116559209A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100339854B1 (en) | Automated Quality Control Method and Device | |
| US4757334A (en) | System for density correction of medical imaging film hard copy | |
| US7729527B2 (en) | Method for correcting an image data set, and method for generating an image corrected thereby | |
| JPH114822A (en) | Image quality test phantom tool and digital x-ray image processing method | |
| JP5203946B2 (en) | Method and apparatus for automatic exposure control | |
| US7791039B2 (en) | Radiation image capturing apparatus and method of detecting malfunction of radiation image capturing apparatus | |
| KR20060099412A (en) | Scattering compensating method and scattering measuring method | |
| CN105916283B (en) | Signal of the adjust automatically for x-ray detector analyzes parameter | |
| JP4150906B2 (en) | Method for monitoring changes in quantum detection efficiency of an X-ray detector | |
| US5721623A (en) | Method and device for adjusting a hard-copy-unit | |
| CN116559209A (en) | Neutron photography method and system | |
| JP2008073201A (en) | X-ray ct apparatus, dose display system and dose display method | |
| US20040061884A1 (en) | Printer, method for controlling quality of printing density in printer and system therefor | |
| JP2009082498A (en) | Radiographic equipment, radiographic system, information processing device, and incident dose derivation measure for mamma | |
| US5664252A (en) | Apparatus for use in optimizing photographic film developer apparatus | |
| KR100686534B1 (en) | Diagnostic device of bone density using structure by non-permeable manner of X-ray scintillator | |
| JP7271999B2 (en) | Image processing device, radiography system, program | |
| JP4159698B2 (en) | Radiographic apparatus inspection method and apparatus therefor | |
| US6849366B1 (en) | Systems and methods for film processing quality control | |
| Kruchinin | A method for the routine testing of digital x-ray units | |
| US9662082B2 (en) | Method and apparatus for electronic correction of digital projection data | |
| JPH03215256A (en) | Bone evaluation apparatus | |
| US7254324B2 (en) | Systems and methods for film processing quality control | |
| Holroyd | The measurement of X-ray beam size from dental panoramic radiography equipment | |
| JPH07222740A (en) | X-ray device and correction value table preparing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |