CN102768219B - Combined nondestructive testing method and combined nondestructive testing system - Google Patents

Combined nondestructive testing method and combined nondestructive testing system Download PDF

Info

Publication number
CN102768219B
CN102768219B CN 201210261284 CN201210261284A CN102768219B CN 102768219 B CN102768219 B CN 102768219B CN 201210261284 CN201210261284 CN 201210261284 CN 201210261284 A CN201210261284 A CN 201210261284A CN 102768219 B CN102768219 B CN 102768219B
Authority
CN
China
Prior art keywords
detector
ray
radiation
collimator
array detector
Prior art date
Application number
CN 201210261284
Other languages
Chinese (zh)
Other versions
CN102768219A (en
Inventor
吴志芳
安继刚
刘锡明
王立强
张颜民
丛鹏
黄毅斌
裘伟东
郑健
刘金汇
王振涛
谈春明
Original Assignee
清华大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 清华大学 filed Critical 清华大学
Priority to CN 201210261284 priority Critical patent/CN102768219B/en
Publication of CN102768219A publication Critical patent/CN102768219A/en
Application granted granted Critical
Publication of CN102768219B publication Critical patent/CN102768219B/en

Links

Abstract

本发明公开了一种组合式射线无损检测方法及系统,该方法及系统将g射线源和X射线源与固体线阵探测器、气体线阵探测器及面阵探测器分别借助射线源支架和探测器支架集成在一个刚性基座上,通过不同射线源与不同探测器的组合,分别进行DR扫描成像和断层或锥束CT成像,实现对工件的多能量段、多模式组合检测,能同时满足高检测分辨率、高探测灵敏度、较强的射线穿透能力和良好的长期稳定性等检测要求,可应用于国防、航空航天、工业和科研等领域的高精度射线无损检测。 The present invention discloses a combined radiation nondestructive testing method and system, the method and system of g ray source and an X-ray source and detector array of a solid line, and the gas linear array detector plane array detector and a holder respectively by means of radiation source detector support integrated in a rigid base, respectively, and a tomographic imaging scan DR by combining different sources with different radiation detector, or a cone-beam CT imaging, multi-energy section of the workpiece to achieve multi-mode combination detection, simultaneously to meet the testing requirements to detect high-resolution, high detection sensitivity, strong rays penetrating ability and good long-term stability, high accuracy can be applied to the field of defense, aerospace, industrial, and scientific research ray non-destructive testing.

Description

组合式射线无损检测方法及系统 Combined ray nondestructive testing method and system

技术领域 FIELD

[0001] 本发明涉及一种组合式射线无损检测方法及系统,特别涉及一种采用g射线源和X射线源,以及线阵探测器和面阵探测器,能以多种射线源-探测器组合方式对工件进行高精度DR/CT辐射成像检测的组合式射线无损检测方法及系统,属于射线无损检测技术领域,可应用于国防、航空航天、工业和科研等领域的精细无损检测。 [0001] The present invention relates to a combined-ray non-destructive testing method and system, and particularly relates to an X-ray source and the g-ray source and linear array detector and a planar array detectors, can be a variety of radiation source - detector combinations of the workpiece with high accuracy DR / CT imaging detector modular radiation ray nondestructive testing method and system, the fine-ray nondestructive testing technical field belongs, may be applied to national defense, aerospace, industrial, and scientific research in the field of nondestructive testing.

背景技术 Background technique

[0002] DR (Digital Radiography,数字福射成像)和CT (Computed Tomography,计算机断层成像)技术是医学和工业领域常用的射线无损检测技术。 [0002] DR (Digital Radiography, Fu shot digital imaging) and CT (Computed Tomography, Computed Tomography) is a technique commonly used in the medical and industrial fields ray nondestructive testing technique. 现有的射线无损检测系统往往性能单一,主要针对某一类工件或缺陷进行检测,其性能指标如:反差灵敏度、空间分辨率、穿透能力和长期稳定性等,多是单项突出而难于兼顾。 Existing systems tend radiation performance of a single non-destructive testing, mainly for detecting defects in a workpiece or a certain class, the performance indicators such as: contrast sensitivity, spatial resolution, penetration and long-term stability, mostly single and difficult to take into account the projection .

[0003] 根据所使用的射线源不同,射线无损检测系统分为高能系统和中低能系统。 [0003] The radiation source used in different, non-destructive testing system is divided into a high energy radiation system and low energy systems. 高能系统通常采用X射线加速器作为射线源,中低能系统通常采用X光机或放射性同位素作为射线源。 X-ray systems typically employ high energy accelerator as a radiation source, the low energy X-ray machine system commonly used as a radiation source or a radioisotope. 对于不同的射线源,由于射线能量不同,强度不同,靶点尺寸不同,输出稳定性不同,造成所适用的检测工件厚度范围、缺陷分辨能力等检测指标也不同。 For different radiation sources, because different energy radiation, different intensity, different target sizes, different output stability, resulting in the applicable range of workpiece thickness detected defect detection resolution capability indicators are different. 另一方面,用于辐射成像的探测器也有多种,其探测效率、探测灵敏度、像素尺寸、成像速度、抗辐照性和环境适应性等各有不同。 On the other hand, a detector for radiation imaging there are a variety of detection efficiency of the detection sensitivity, the pixel size, imaging speed, anti-irradiation and environmental adaptability different. 而且,探测性能跟入射射线能量也有很大关系,即使同一种探测器,对不同能量段的x/g射线,其信号响应特性也存在显著差别,对某一能量段的射线不适合,而对另一能量段则可能很理想。 Moreover, detection performance with the energy of the incident radiation have a great relationship, even if the same detector segments of different energy x / g-rays, its signal response characteristic are also significant differences, the radiation energy of a segment is not suitable, but for another energy segment may be ideal. 然而,现有技术中公开的射线无损检测系统存在一个共同的特点,就是通常只使用一种射线源和一种探测器,即:射线源只单独使用X光机、X射线加速器或g射线源中的一种,探测器只使用面阵探测器和线阵探测器中的一种,多个能量段与高稳定性难于同时获得,不同类型探测器的优势难于充分发挥,缺陷分辨能力受限,难于获得宽能量范围的探测效果,其局限性和不足具体描述如下: However, there are disclosed in the prior art ray nondestructive inspection system is a common feature, that is usually only one radiation source and one detector, namely: only a single ray source X-ray machine, X-ray or g-ray source accelerator of one, the use of only one detector area array detector and a linear array detector, a plurality of segments with high energy stability is difficult to achieve at the same time, the advantages of the different types of detector is difficult to sufficiently play, limited the ability to distinguish the defect , detection results difficult to obtain a wide energy range, limitations and shortcomings described as follows:

[0004] 1、射线能量范围窄,适于检测的对象受到限制 [0004] 1, a narrow energy range, suitable for detecting objects is limited

[0005] —般来讲,射线能量越高,穿透能力越强,但更高的射线能量并不一定带来更高的检测精度。 [0005] - generally speaking, the higher the radiation energy, the stronger penetrating power, but high energy radiation does not necessarily lead to higher detection accuracy. 射线能量偏低,会导致穿透能力不足;射线能量过高,穿透能力增强,但是射线衰减过少,会降低成像系统的反差灵敏度,影响成像质量。 Ray energy is low, will lead to lack of penetration; ray energy is too high, penetration increased, but too little ray attenuation will reduce the contrast sensitivity of the imaging system, affecting image quality. 对于不同大小的工件和工件内不同尺寸的缺陷,需要用不同能量的射线检测,或者说,对一定能量的射线,存在一个最佳厚度测量范围。 For defective workpieces of different sizes and of different sizes within the workpiece, we need different energy-ray detector, or, for certain energy ray, there is an optimum range of thickness measurements. 例如,450kV X光机的最佳检测厚度约为2.3cm等效铁厚度,Co-60 g射线源的最佳检测厚度约为4.7cm等效铁厚度,15MeV X射线加速器的最佳检测厚度约为8cm等效铁厚度,等等。 For example, the optimal thickness of 450kV X-ray detector about 2.3cm equivalent iron thickness, the thickness of the optimal detection Co-60 g-ray source is about 4.7cm equivalent iron thickness, the thickness of 15MeV X-rays optimal detection accelerator about iron equivalent thickness of 8cm, and the like. 使用不同射线源的检测系统在其最佳检测厚度附近能获得最高的检测精度,检测效果最好,而偏离这个范围,其检测能力就会下降。 Using different sources of radiation detection system detects optimum thickness in the vicinity of the highest detection accuracy can be obtained, the best detection, but deviate from this range, the detection capability will decline. 因此,采用单个射线源的检测系统,受射线能量范围限制,其适于检测的对象范围较窄,缺陷分辨能力有限,这也是工业CT系统往往需要根据检测对象进行定制的重要原因。 Accordingly, the detection system using a single radiation source, by the energy range limit, the scope of which is adapted to detect the object is narrow, limited ability to distinguish a defect, which is the industrial CT systems often be customized according to the detection target important reasons.

[0006] 2、不能综合利用不同类型射线源的优点最大限度提高检测能力 [0006] 2, the advantage of combining different types of radiation sources can maximize detection capabilities of

[0007] 任何一种射线源用于辐射成像都有其优点,也有其不足,具体表现在:(i)X光机射线源焦点尺寸小,射线强度高,可以实现很高的空间分辨率,但是射线能量较低,能谱是连续谱,存在穿透能力不强和射线束硬化等问题,对于质量厚度较小的工件有很好的检测效果,而对于质量厚度较大、稳定性要求很高,和缺陷的尺寸需要精细定量检测的要求就难于满足;(ii)x射线加速器的射线能量高,强度大,可以穿透较厚的工件,但是靶点大,射线强度及能量的空间分布差异大,前冲性大,且X射线输出稳定性较差,能谱也是连续谱,同样存在射线束硬化问题,能检测质量厚度较大的工件,但空间分辨率、检测灵敏度和测量稳定性等都受到限制。 [0007] Any radiation source for radiation imaging has its advantages, but also has its drawbacks, in particular in: (i) X-ray small-ray source focal spot size, high radiation intensity, high spatial resolution can be achieved, However, lower-ray energy spectrum is a continuous spectrum, there is no strong penetrating power and beam hardening problems, for smaller mass thickness of the workpiece is detected with good results, and for the quality of a large thickness, stability requirements are high dimensions, and the need to ask the fine defects it is difficult to meet the quantitative detection; high-energy rays (ii) x-ray accelerator, high strength, can penetrate thicker workpieces, however large the target, the energy and spatial distribution of radiation intensity differences, large downfield, and the poor stability of the X-ray output, spectrum is a continuous spectrum, there are also problems beam hardening can be detected thickness of the workpiece a larger mass, but the spatial resolution, detection sensitivity and measuring stability so limited. 另外,由于加速器的X射线束张角小,要检测较大尺寸的工件,检测系统占用的空间就较大,机械结构也很复杂,而且辐射防护要求也很高;(iii)g射线源,如Co-60,其射线强度以固定的半衰期逐渐减弱,在任意时刻都是确定且可计算出的,其强度的空间分布各向同性,其产生的g射线为1.17MeV和1.33MeV的单能g射线,基本不存在射线硬化问题,穿透能力较强,与4MeV加速器相当,而且特别适合检测工件在较长时期内质量厚度的微小变化,但也存在射线源靶点尺寸较大、射线强度较低的不足。 Further, due to the small accelerator opening angle X-ray beam, a larger size of the workpiece to be detected, the detection system a large space occupied, the mechanical structure is complex, but also high radiation protection requirements; (iii) g-ray source, the Co-60, which is fixed to the half-ray intensity is gradually weakened, isotropic distribution at an arbitrary timing is determined and calculated, and the spatial intensity, g rays and generates 1.33MeV to 1.17MeV monoenergetic g-rays, radiation curable fundamental problem does not exist, a strong penetrating power, and is quite 4MeV accelerator, and is particularly suitable for detecting small changes in workpiece mass thickness over a longer period, but there is a large target size-ray source, the radiation intensity lower inadequate. 这几种射线源中的任何一种单独使用都有其局限性,如果将它们结合使用,尤其是将例如Co-60的g射线源与X光机结合使用,就能弥补各自的不足,使组合式检测系统能发挥出最大效能。 Any of these types of radiation sources have their limitations alone, if they are used in combination, in particular, for example, Co-60 g-ray source used in conjunction with X-ray machine can compensate for their lack of the combined detection system can play the greatest efficiency.

[0008] 3、不能充分发挥各种探测器的优点,最大限度地提高检测能力 [0008] 3, can not give full play to the advantages of the various detectors, to maximize the ability to detect

[0009] 不同类型探测器具有不同的特点,各有优点也各有局限性,具体表现在:(i)面阵探测器:空间分辨率高,可达μ m级,成像速度快,但灵敏体厚度仅有0.2〜0.5_,探测效率低,次级电子串扰难于消除,对于低能射线的探测比较合适;(ii)固体线阵探测器:灵敏体厚度可达cm级,探测效率高,检测灵敏度高,但空间分辨率难于做到μ m级,需要逐行扫描,成像速度慢,而且易受辐照、环境温湿度等因素影响,长期稳定性较差;(iii)气体线阵探测器:性能稳定,环境适应性强,耐辐照,但探测器单元的尺寸难于做小,空间分辨率受到较大限制。 [0009] Different types of detectors having different characteristics, each with its own advantages and limitations, in particular in: (i) plane array detector: high spatial resolution, up to μ m level, imaging speed, but sensitive 0.2~0.5_ thickness only, the low detection efficiency of the secondary electron difficult to eliminate crosstalk for detecting low-energy radiation more appropriate; (ii) a solid linear array detector: sensitive cm thickness up stage, high detection efficiency, detection high sensitivity, but is difficult to achieve μ m spatial resolution, which requires progressive scan, the imaging speed is slow and susceptible to radiation, environmental factors such as temperature and humidity, poor long term stability; (iii) gas linear array detector : stable performance, environmental adaptability, resistance to radiation, but the size of the detector unit is difficult to make small, the spatial resolution more restricted. 因此,对于不同的射线能量和不同的缺陷,需要用不同类型的探测器才能获得最佳检测效果,单一类型的探测器难于胜任复杂的检测要求。 Thus, for different radiation energies and different defects, require different types of detectors in order to obtain optimal detection results, a single type of detector is difficult to detect competent complex requirements.

[0010] 4、无法同时满足灵敏度高、穿透能力强和长期稳定性好的检测需求 [0010] 4, can not simultaneously satisfy high sensitivity, good long-term stability and penetration testing needs

[0011] 在某些特殊领域,检测对象质量厚度较大(相当于几厘米铁),而检测精度要求又非常高:要分辨出细微的(μ m级)裂缝、脱落、鼓泡等缺陷,能发现较长时期(数月,甚至数年)内发生的0.1%的微小质量厚度变化等。 [0011] In certain specific areas, the quality of the detection target thickness is large (corresponding to a few centimeters of iron), and the detection precision and very high: To detect subtle (μ m level) fracture, falling, bubbling defects, It can be found (a few months, or even years) the quality of the thickness of the small changes that occur within a longer period of 0.1%. 这种情况对于空间分辨率、检测灵敏度和长期稳定性等指标的要求都很高,是现有辐射成像检测系统难于实现的。 This situation requires indicators spatial resolution, detection sensitivity and long-term stability are high, a conventional radiation imaging detector system difficult to achieve.

发明内容 SUMMARY

[0012] 本发明要解决的技术问题是克服现有辐射成像检测系统采用单一射线源和单一探测器工作模式的不足,在一套集成的小型化系统上,实现对工件的多能量段、多模式组合检测,以同时满足高检测分辨率、高探测灵敏度、较强的射线穿透能力和良好的长期稳定性等检测要求。 [0012] The present invention is to overcome the technical problem forming the radiation detection system uses a single radiation source and is less than the single mode operation of the detector, in a miniaturized integrated system, a multi-energy section of the workpiece, multiple combination detection mode, to simultaneously meet the testing requirements of high detection resolution, high detection sensitivity, strong radiation penetration and good long-term stability.

[0013] 为解决上述技术问题,本发明提出了一种组合式射线无损检测方法,以及应用该方法的一种组合式射线无损检测系统,该方法及系统在一个包括g射线源和X射线源,以及线阵探测器和面阵探测器的组合式射线无损检测系统上,通过不同射线源与不同探测器的多种组合,实现多能量段、多检测模式、高分辨率、高精度、高稳定性的DR/CT射线无损检测。 [0013] In order to solve the above technical problem, the present invention proposes a modular method of nondestructive testing radiation, and a combined application of the method of ray nondestructive inspection system, which includes a method and system in a g-ray source and the X-ray source and a linear array detector, and a unitized upper panel detector ray non-destructive inspection system, by a variety of different combinations of radiation sources with a different detector, multi-energy segment, multi-detection mode, high resolution, high precision, high stability DR / CT-ray non-destructive testing. [0014] 本发明的组合式射线无损检测方法,具体为: [0014] Combined ray nondestructive testing method of the present invention, specifically:

[0015] 利用射线源产生的X射线或g射线对工件进行照射,用探测器接收穿过工件的射线,并转换成数字信号,然后对信号进行处理,得到工件的辐射图像,其中,射线源采用包含X射线源和g射线源的组合式射线源,探测器采用包含固体线阵探测器、气体线阵探测器和面阵探测器的组合式探测器,通过切换不同的射线源和探测器组成不同的检测单元,实现对工件的DR扫描成像或断层CT成像或锥束CT成像;所述组合式射线源和组合式探测器,以及工件转台均安装在同一刚性基座上。 [0015] using ray source generates X-rays or g-rays irradiated to the workpiece, with the detector receives radiation passing through the workpiece, and converted into a digital signal and then process the signals, to obtain the radiation image of the workpiece, wherein the radiation source a modular radiation source comprises an X-ray source and a g-ray source, the detector probe comprising a solid with modular linear array detector, and a linear array detector gas panel detector, by switching different ray source and detector means of detecting a different composition, to achieve the workpiece DR imaging or tomographic scan cone-beam CT imaging or CT imaging; the combined-ray source and detector combination, the turntable and the workpiece are mounted on the same rigid base.

[0016] 进一步,所述组合式射线源的射线出口设置有前准直器,该前准直器将射线准直成扇形束或锥形束,所述组合式探测器的射线入口设置有后准直器;当切入的探测器为固体线阵探测器或气体线阵探测器时,所述后准直器将射线准直成与探测器单元高度、数量相当的小射线束,其准直缝宽度小于所述探测器单元宽度;在进行DR成像时,所述后准直器可沿探测器单元宽度方向蠕动,每蠕动一次获取一组投影数据,每次蠕动的距离为准直缝宽度。 [0016] Further, the combined outlet-ray radiation source is provided with a front collimator, the collimator before the ray collimator into fan-beam or cone-beam, the combined inlet ray detector is provided with a rear collimator; when the hand-detector linear array detector is a solid or a gas linear array detector, said collimator will ray collimator to the detector unit height, a considerable number of small beam, which is collimated slit width less than the width of the detector unit; DR during imaging, the collimator may creep along the width direction of the detector unit, each time acquiring a peristaltic set of projection data, each creeping distance collimator slit width .

[0017] 一种应用上述方法的组合式射线无损检测系统,包括:一个刚性基座,基座上依次间隔排列有射线源支架、工件转台、探测器支架;射线源支架上设置有包含g射线源和X射线源的组合式射线源,以及用于将组合式射线源中的不同射线源移入工作位置的切换机构,和对移入的射线源进行上下、前后、左右和旋转操作的机构;探测器支架上设置有包含固体线阵探测器、气体线阵探测器和面阵探测器的组合式探测器,以及用于将组合式探测器中的不同探测器移入工作位置的切换机构,和对移入的探测器进行上下、前后、左右和旋转操作的机构;射线源支架上设置有能够将射线源输出的射线准直成扇形束或锥形束的前准直器,探测器支架上设置有对射线做进一步准直处理的后准直器;所述气体线阵探测器和所述固体线阵探测器均为圆弧形结构,当其被移 [0017] One application of the above method combined ray nondestructive inspection system, comprising: a rigid base, the base having successively spaced stent-ray source, the workpiece turret, the detector support; a radiation source is provided with a bracket comprising g- combined ray source X-ray source and a source, and a radiation source for combined-ray source into a different working position the switching mechanism, and to move up and down the radiation source, front and rear, and left and right rotation operation mechanism; probe It is provided on the bracket with a linear array detector comprising a solid, combined linear array detector and a gas detector area array detector, and a combined probe for different detectors working position into the switching mechanism, and for the detectors moved up and down, front and rear, and left and right rotation operation mechanism; ray source holder is provided with a quasi-ray radiation source can be output directly to the front fan-beam or cone beam collimator, the detector support is provided with after further radiation-collimated do collimator; the gas linear array detector and the solid line array detectors are arcuate configuration, when it is moved 入工作位置上后,探测器上各探测器单元的射线入射窗沿着以处于工作位置上的射线源的源心为圆心的圆弧均匀紧密排列,且每个探测器单元的中心线均通过所述圆心,与气体线阵探测器或固体线阵探测器相配的后准直器同样为以处于工作位置上的射线源的源心为圆心的圆弧形结构,该后准直器的准直缝可将所述扇形射线束准直成与探测器上的各探测器单元一一对应的小射线束,并且准直缝的宽度小于探测器单元的宽度;在进行DR成像时,所述后准直器紧邻所述气体线阵探测器或固体线阵探测器,且可沿探测器单元的排列方向蠕动,每次蠕动的距离为准直缝的宽度。 After the operating position, the detector ray input window of each detector unit is the heart of the source along a radiation source in the operating position of the center arc is closely spaced uniformly, and the centerline of each of the detector unit have passed said center, and the gas linear array detector or a solid rear mating linear array detector collimator likewise prospective source to the heart is in the working position of the radiation source as the center of the circular arc-shaped configuration, the rear collimator linear the slits may be collimated into a fan beam of small beam-one correspondence with the respective detectors on the detector means, and the collimator slit width smaller than the width of the detector unit; DR during imaging, the rear a collimator proximate said gas line array detector or a solid linear array detector, and may creep along the arrangement direction of the detector unit, the width of each subject creeping distance of a straight seam.

[0018] 进一步,所述准直缝的宽度为探测器单元宽度的1/2、1/3或1/4。 [0018] Further, the collimator slit width of the detector cell width 1 / 2,1 / 3 or 1/4.

[0019] 进一步,所述g射线源是Co-60、Cs-137或Ir_192放射性同位素g射线源。 [0019] Further, the g-ray source is a Co-60, Cs-137 radioisotope or Ir_192 g-ray source.

[0020] 进一步,所述X射线源是小焦点X光机、微焦点X光机和/或X射线加速器。 [0020] Further, the X-ray source is a small focal spot X-ray machines, micro-focus X-ray and / or X-ray accelerator.

[0021] 进一步,所述面阵探测器是非晶硅、非晶硒或CMOS面阵探测器。 [0021] Further, the flat panel detector is amorphous silicon, amorphous selenium or CMOS area array detector.

[0022] 进一步,所述气体线阵探测器是充气电离室、多丝正比室或盖格计数管线阵探测器。 [0022] Further, the linear array detector is a gas ionization chamber inflatable, multi-wire proportional chamber or Geiger counter line array detectors.

[0023] 进一步,所述固体线阵探测器是固体闪烁体线阵探测器或半导体线阵探测器。 [0023] Further, the solid line is a solid scintillator array detector linear array detector or a semiconductor line array detector.

[0024] 进一步,所述固体闪烁体线阵探测器的闪烁体是Na1、Cs1、CdWO4、LaBr3或LaCl3。 [0024] Further, the solid scintillator linear array detector is a scintillator Na1, Cs1, CdWO4, LaBr3 or LaCl3.

[0025] 实践证明,本发明的多能量段、多模式、高精度组合式射线无损检测方法及系统对于被检工件及其内部缺陷具有很好的检测效果,既可以达到很高的空间分辨率和密度分辨率,又可以对工件内部感兴趣区在长时期内的微小质量厚度变化进行检测。 [0025] Practice has proved that a multi-energy section of the present invention, the multi-mode, high-precision modular ray nondestructive testing method and system for detecting the effect of having a good subject workpiece and internal defects, can achieve both high spatial resolution density and resolution, and can detect a slight change in thickness of the workpiece mass inside the region of interest over a long period. [0026] 本发明检测系统的射线源能量范围宽,既可包含中高能的g射线源(射线能量从几百keV〜几千keV),又包含中低能的X射线源(射线能量从几十keV〜几百keV),可以综合利用多能量段、不同属性射线的优点,适于检测的工件质量厚度范围更大,可以实现更强大的功能和达到更高的检测能力;将不同射线源分别与面阵探测器或气体线阵探测器或固体线阵探测器组合,构成不同的射线源-探测器检测单元,既可以进行不同解析度的快速三维锥束CT立体成像检测,也可以对重点区域进行二维扫描DR或二维断层CT精细无损检测,充分发挥各种成像探测器的优势;将不同种类射线源和不同类型探测器通过巧妙的结构设计有机结合为一个整体,一套装置可以提供几种到几十种射线源-探测器组合模式,相当于同时拥有几套不同类型的检测系统,既有更强的对象适应性, [0026] The width of the radiation source detection system of the present invention, energy range, g-ray source comprising either a high energy (energy rays from a few hundred thousand keV~ keV), but also contains low energy X-ray source (radiation energy from dozens keV~ hundreds of keV), may be a multi-energy utilization segments, among different radiation properties of advantages, more adapted to detect quality of the workpiece thickness range, you can achieve more powerful and achieve higher detection capability; ray sources are different planar array detectors or a linear array detector array detector gas composition or solid lines, constitute a different radiation source - detector detecting unit, may be different for quick resolution of 3D cone beam CT imaging stereoscopic detection, the key may be two-dimensional scanning region DR-dimensional tomographic or CT NDT fine, full advantage of the various imaging detector; radiation sources of different kinds and different types of detectors through the ingenious combination of the design as a whole, a device may be offers several to dozens of radiation source - detector combination mode, also has several sets corresponding to different types of detection systems, both objects more adaptability, 能充分发挥不同类型射线源和探测器的特点,达到更高的缺陷检测能力。 Give full play to the characteristics of different types of radiation sources and detectors, to achieve higher defect detection capability. 本发明检测系统结构紧凑,体积小、占地面积少,对工件厚度、形状和尺寸的适应能力强,缺陷检测精度高,功能强大,性价比高,特别适用于检测对象差异较大及检测要求较高的应用场所,可以满足国防、航空航天、工业和科研等部门的各种高精度复杂检测要求。 Detection system of the present invention is compact structure, small volume, small footprint, adaptable to the workpiece thickness, shape and size, high defect detection precision, powerful, cost-effective, especially for the detection target and the detection requirements are quite different than various high-precision detection of complex applications requiring high places, to meet national defense, aerospace, industrial and scientific sectors.

附图说明 BRIEF DESCRIPTION

[0027] 图1是本发明组合式射线无损检测系统的立体图。 [0027] FIG. 1 is a perspective view of a detection system of the present invention is a combined-ray nondestructive.

[0028] 图2是线阵探测器的探测器单元和后准直器准直缝的结构形式,以及后准直器蠕动方向的局部放大不意图。 [0028] FIG. 2 is a detector unit structure and a linear array detector collimator collimating slit, and the local direction of the quasi-linear amplification peristaltic not intended.

[0029] 图3是g射线源的侧视剖面图。 [0029] FIG. 3 is a side sectional view of g-ray source.

具体实施方式 Detailed ways

[0030] 下面结合附图,对本发明的具体实施方式进行详细说明。 [0030] below with the accompanying drawings, specific embodiments of the present invention will be described in detail.

[0031] 如图1所示,本发明组合式射线无损检测系统包括:基座5及其底部的垫铁14 ;垂直固定在基座上的射线源支架10和探测器支架I ;可沿射线源支架10升降或平移并定位的射线源机架12 ;可沿探测器支架I升降或平移并定位的探测器机架7 ;固定在射线源机架12上的X射线源9和g射线源13 ;固定在探测器机架7上的面阵探测器6、固体线阵探测器2和气体线阵探测器4 ;工件转台15及其上的工件卡具8 ;以及射线源的前准直器11和线阵探测器的后准直器3。 [0031] As shown, the present invention is a combined-ray non-destructive testing system comprising: a base 5 and the bottom of the horn 14; vertically fixed radiation source and a detector support bracket 10 on the base I; along the ray 10 and the lifting or translating source support frame 12 positioned radiation source; I can stand or translational movements and positioning of the probe along the frame detector 7; ray source fixed to the frame 12 of the X-ray source 9 and a g-ray source 13; frame 7 is fixed on the detector plane array detector 6, solid linear array detector 2 and the gas linear array detector 4; turntable 15 and the workpiece on a workpiece jig 8; and a front-ray source, a collimator 11 and the rear linear array detector collimator 3.

[0032] 工件转台15可以旋转和升降,也可以沿平行或垂直于射线源与探测器连线的方向平移。 [0032] The turntable 15 can be rotated and the workpiece movements, may also be translated in a direction parallel or perpendicular to the direction of the radiation source and the detector connection. 射线源和探测器可以随各自机架升降或平移,并精确定位到指定位置。 Ray source and detector can lift or translate with each rack, and to pinpoint the location specified. X射线源9和g射线源13的射线出口处都分别装有前准直器11,该前准直器11由铅合金、钨合金或贫铀材料制成,其内部设有水平喇叭形狭缝和方锥形开孔,可通过水平移位进行切换,将射线准直成扇形束或方锥形束,分别用于线阵探测器或面阵探测器成像。 X-ray source 9 and a g-ray source 13 at the outlet are respectively provided with the front 11 of the collimator, the collimator 11 before a lead alloy, is made of a tungsten alloy or depleted uranium, which is internally provided with a horizontal slit horn and a tapered square hole, may be displaced by the switching level, the ray collimator into fan-beam or cone-beam side, respectively, to linear array detector or imaging plane array detector. 固体线阵探测器2和气体线阵探测器4的射线入口侧都分别装有后准直器3,用于将即将进入线阵探测器的扇形射线进一步准直成与探测器单元对应的多个小射线束。 The solid fan-ray linear array detector 2 and a gas inlet-side ray linear array detector 4 are respectively provided with the collimator 3, for about to enter the linear array detector are further collimated into a corresponding plurality of detector units a small beam. 面阵探测器6的活性区(即由用于探测X或g射线的敏感材料构成的方形区域)以外的方框形区域用铅合金或钨合金平板屏蔽材料覆盖(附图1中未示出),以防止射线对面阵探测器6的电子元器件产生辐照损伤。 Regions lead alloy or a tungsten alloy with a box-shaped cover plate shielding material other than the active surface of the detector array region (i.e., square region composed of a material sensitive for detecting X-rays or g) 6 (not shown in the drawings 1 ), in order to prevent radiation across the array detector 6 generates the electronic component of radiation damage. 基座5由整体的铸铁、石材或钢结构框架制成,既起到刚性支撑和减震作用,又是整个检测系统安装和调校的基准面。 Susceptor 5 is made integrally cast iron, steel or stone framework, both as a rigid support and cushioning effect, and the entire system installation and calibration of the detection plane. 垫铁14用来将基座5调节到水平状态,一般为4个、6个或8个,分布在基座5下表面的四个角或四边的中间位置。 Horn 14 to the base 5 is adjusted to the horizontal state, usually 4, 6 or 8, located in the four corners or four sides of the intermediate position of the lower surface of the base 5.

[0033] 本发明的检测系统包含了面阵探测器和线阵探测器,可分别与X射线源或g射线源组合,进行DR成像和CT成像,其工作模式包括: [0033] The detection system of the present invention comprises a flat panel detector and a linear array detector, respectively, may be a combination of X-ray source or a g-ray source and, for DR imaging and CT imaging, which mode of operation comprises:

[0034] 面阵探测器DR成像:将选定射线源和面阵探测器升降或平移到设定位置,使得射线源中心和面阵探测器中心位于同一水平面,且工件完全包含在面阵探测器成像区内;将前准直器水平移位到锥形开孔位置,打开射线源快门,射线经前准直器11准直成锥形束,穿透工件后由面阵探测器6接收,获得二维DR投影图像。 [0034] DR imaging panel detector: selected radiation source and the flat panel detector lift or move to the set position, such that the central ray source and the detector center plane array at the same level, and the workpiece is fully contained in an area array detection imaging area; front collimator position horizontally displaced to a tapered opening, a shutter opening-ray source, the pre-register 11 by the ray collimator into a straight cone beam, after piercing the workpiece is received by the flat panel detector 6 , a two-dimensional projection images DR.

[0035] 面阵探测器CT成像:将选定射线源和面阵探测器升降或平移到设定位置,使得射线源中心和面阵探测器中心位于同一水平面,且工件完全包含在面阵探测器成像区内;将前准直器水平移位到锥形开孔位置,打开射线源快门,工件转台以设定的转速转动360度,每转动一个步长就获取一帧投影图像,全部投影数据获取完成后,经过数据处理和图像重建,获得工件的三维锥束CT图像。 [0035] The flat panel detector CT imaging: radiation source and the selected planar array detectors or down shifted to the set position, such that the central ray source and the detector center plane array at the same level, and the workpiece is fully contained in an area array detection imaging area; front collimator position horizontally displaced to a tapered opening, a shutter opening-ray source, the workpiece rotation speed to set the turntable 360 ​​is rotated, each rotation of one step to obtain a projection image, all projection after completion of data acquisition, data processing and image reconstruction after obtain a three-dimensional cone-beam CT workpiece image.

[0036] 线阵探测器DR成像可以通过两种扫描方式实现: [0036] DR imaging linear array detector may be implemented in two scanning methods:

[0037] I)将选定射线源和线阵探测器升降或平移到设定位置,使得射线源中心和线阵探测器中心位于同一水平面(检测面),且该检测平面稍高于工件的顶端或稍低于工件的底端(检测区外),将前准直器移位到狭缝位置,打开射线源快门,转台15以设定的速度托着被测工件匀速上升或下降,经前准直器11准直而成的片状射线束对被测工件进行垂直扫描,透过工件的射线经后准直器3准直后,由固体线阵探测器2或气体线阵探测器4接收,并经过数据处理系统转换为DR投影图像。 [0037] I) selected ray source and linear array detector set to move down or flat position, such that the central ray source and linear array detector center at the same level (detection surface), and the detection plane slightly above the workpiece slightly lower than the top or bottom end of the workpiece (outside the detection zone), will be displaced to the front collimator slit position of radiation source shutter is opened, the turntable 15 at a set speed uniform workpiece holding up or down, by collimator 11 before collimated sheet-shaped beam of the workpiece is scanned vertically through the collimator 3 rays collimated by the workpiece 2 by the solid line array detector or a gas linear array detector 4 receives, via the data processing system and converted into a projection image DR.

[0038] 2)将选定射线源和线阵探测器升降或平移到设定位置,使得射线源中心和线阵探测器中心位于同一水平面(检测面),且该检测平面稍高于工件的顶端或稍低于工件的底端(检测区外),将前准直器移位到狭缝位置,打开射线源快门,射线源和线阵探测器以设定的速度同步匀速下降或上升,经前准直器11准直而成的片状射线束对被测工件进行垂直扫描,透过工件的射线经后准直器3准直后,由固体线阵探测器2或气体线阵探测器4接收,并经过数据处理系统转换为DR投影图像。 [0038] 2) radiation source and the selected linear array detector set to move down or flat position, such that the central ray source and linear array detector center at the same level (detection surface), and the detection plane slightly above the workpiece slightly lower than the top or bottom end of the workpiece (outside the detection zone), will be displaced to the front collimator slit position, the shutter opens radiation source, the radiation source and the linear array detector set at a rate synchronization uniform fall or rise, 11 sheet-shaped collimated beam vertically scanned on the workpiece by the front collimator, transmitted through the collimator 3 rays collimated by the workpiece is detected by the solid line array detector or a gas linear array 2 4 receives, via the data processing system and converted into a projection image DR.

[0039] 如图2所示,气体线阵探测器或固体线阵探测器为圆弧形结构,由多个探测器单元21构成,探测器单元21面向射线源的端面(即射线入射窗)沿第一圆弧线24均匀紧密排列,该第一圆弧线24以射线源源心(即X射线源的靶心或g射线源的放射源)为圆心,以射线入射窗到射线源源心的距离为半径。 [0039] 2, gas or solid linear array detector linear array detector is an arc-shaped structure constituted by a plurality of detector units 21, end surface 21 facing the radiation source (i.e. radiation incident window) detector unit 24 closely spaced uniformly along the first arcuate line, the first arcuate line 24 to the stream of radiation heart (i.e., bullseye radiation source X-ray source or a g-ray source) as the center ray incident window to the stream of radiation from the heart the radius. 探测器单元21的高度和宽度就是指该射线入射窗的高度和宽度,该宽度与高度的乘积即该线阵探测器的像素值。 The height and width of the detector unit 21 refers to the height and width of the radiation entrance window, the product of the width and height, i.e. pixel value of the linear array detector. 探测器单元21的数量应使其射线入射窗构成的第一圆弧线24的长度与射线源源心共同形成的扇形区能覆盖被检测工件的每个需检测的截面,且最好是8的整数倍。 The number of the detector unit 21 so as to be a first circular path of the ray incident window frame sector length of the stream of radiation 24 together form the heart can cover section of each piece to be detected is detected, and preferably 8 integer multiples. 每个探测器单元21的射线入射窗沿圆弧方向的宽度,应满足本发明检测系统的检测分辨率要求。 Each arcuate ledge width direction of incident radiation detector unit 21, the detection should meet the resolution requirements of the detection system of the present invention. 每个探测器单元21长度方向(即平行于射线的方向)的中心线均指向射线源源心。 Each detector unit 21 the longitudinal direction (i.e., parallel to the direction of the radiation) of radiation directed stream of a center line average heart. 线阵探测器的后准直器3也是圆弧形结构,其第二圆弧线25亦以射线源源心为圆心,且其半径略小于第一圆弧线24的半径。 After the linear array detector collimator 3 is arc-shaped structure, a second arcuate line 25 drawn up stream of the heart as the center ray, and whose radius is slightly smaller than the radius of the first circular arc line 24. 后准直器3由沿第二圆弧线25均匀平行排列的、由长方形钨合金薄片制成的隔离片23,以及用于精确固定隔离片23、由紫铜或铅合金或钨合金制成的上下两块平行夹板(附图2中未示出)构成。 3 after uniformly arranged in parallel by the collimator 25 along the second arcuate line, a rectangular sheet made of a tungsten alloy spacer 23, and a spacer 23 for fixing precisely, a copper or a tungsten alloy or a lead alloy made of two parallel upper and lower jaw configuration (not shown in the drawing). 隔离片23与夹板之间形成多个准直缝22,将进入探测器之前的射线进一步准直成多个小射线束。 Spacer 23 is formed between the jaws and a plurality of collimating slits 22, will enter the radiation detector prior to further collimated beam into a plurality of small. 准直缝22的高度为两块夹板之间的距离,宽度为相邻两片隔离片23之间的距离。 The height of the collimator slit 22 is the distance between the two jaws, the width 23 is the distance between two adjacent spacer. 准直缝22的高度等于或略大于探测器单元21的高度,宽度为探测器单元21宽度的1/2、1/3或1/4,数量与探测器单元21的数量相同。 Collimation slit height or slightly greater than the height 21 of the detector unit 22, the width of the width of the detector unit 21 1 / 2,1 / 3 or 1/4, the same number 21 to the number of detector units. 每一片隔离片23长度方向(即平行于射线的方向)的延长线都通过射线源源心,使得每一个准直缝22的中心线也都通过射线源源心,从而提高透射射线通过准直缝后进入探测器单元的效率,并有效阻隔散射射线,减小相邻探测器单元21之间的信号串扰。 Each spacer 23 a longitudinal direction (i.e., parallel to the direction of the radiation) of the extension line of the stream of radiation through the heart, such that each of the collimator slit 22 is also the centerline of the stream of radiation through the core, thereby improving the radiation transmitted through the collimator slit detector unit entrance efficiency, and effectively blocking scattered radiation, reducing signal crosstalk between neighboring detector unit 21. 在进行线阵探测器DR成像时,后准直器3可整体沿第二圆弧线25双方向蠕动,每蠕动一次就获取一组投影数据,每次蠕动的距离为准直缝22的宽度,从而使DR成像的空间分辨率达到探测器单元21宽度值的1/2、1/3或1/4,可进一步提高本发明检测系统的检测分辨率。 During DR imaging linear array detector, the collimator 3 can be integrally sides along the second arcuate line 25, peristaltic once every acquired set of projection data to a creep, creeping distance of each collimator slit width 22 so that the spatial resolution imaging DR 1 / 2,1 / 3 or 1/4 width value detector unit 21, may further improve the detection resolution of the detection system of the present invention.

[0040] 线阵探测器CT成像:将选定射线源和线阵探测器升降到设定位置,使得射线源中心和线阵探测器中心位于同一水平面(检测面),工件转台15升降到设定位置,使得工件的待检部位位于检测平面;将前准直器移位到狭缝位置,打开射线源,工件转台15以设定转速转动360度,每转动一个恒定角度就获取一组投影数据,全部数据获取完成后经过数据处理和图像重建,获得被测工件待检测部位的CT断层图像。 [0040] The linear array detector CT imaging: selected radiation source and linear array detector down to the set position, such that the central ray source and linear array detector center at the same level (detection surface), the work turret 15 is provided to lift predetermined position, such that the workpiece part to be seized on the detector plane; the front collimator slit position displaced to open the radiation source, the workpiece 15 at a set speed of rotation of the turntable 360, rotated by a constant angle to each acquire a set of projection data, all data acquisition and image reconstruction after data processing, to obtain CT tomographic image of the workpiece portions to be detected after the completion.

[0041] 如图3所示,g射线源包括一个由铅合金、钨合金或贫铀制成的屏蔽体36,其内部具有一个射线入口37和一个射线出口38 ;—个可在该屏蔽体36中与之相对转动的旋转快门35,其旋转轴线水平布置,其内部具有当其转动时可选择地使屏蔽体36中射线入口37和射线出口38相连通或断开的连接通道39,该连接通道39从射线入口37到射线出口38成喇叭形扩张,与屏蔽体36的射线入口37和射线出口38共同构成一个成喇叭形扩张的射线通道,使g射线呈扇形束或锥形束;以及一个位于射线入口37起始位置的放射源34。 [0041] 3, g-ray source comprises a lead alloy, the shielding body made of a tungsten alloy or depleted uranium 36, having therein a radiation ray inlet 37 and outlet 38 a; - a shield 36 which may be in contrast the rotation of the shutter 35 is rotated, its rotational axis arranged horizontally, with its interior when rotation of the shield body selectively ray radiation inlet 37 and an outlet connected or disconnected through connecting channels 383,936, which is connected ray 37 to the passage 39 flaring from the outlet 38 to the inlet ray, and radiation shield 37 and the inlet 36 of the outlet 38 together form a radiation into radiation flaring passage showed that the g-ray fan beam or cone beam; and a radiation inlet 37 located in the starting position of the radiation source 34.

[0042] 采用包括屏蔽体36和水平布置的旋转快门35,其中旋转快门35内部具有成喇叭形扩张的连接通道39的g射线源,由于旋转快门35的重心偏离其旋转轴线,使其在不施加外力的情况下,能靠自重产生旋转,从而切断射线,使该g射线源具有在断电情况下自动关闭射线的固有安全性能。 [0042] The shield body 35 comprises a rotary shutter 36, and horizontally arranged, wherein the rotary shutter 35 having an internal flaring connecting channel to g-ray source 39, since the center of gravity of the rotary shutter is offset from its axis of rotation 35, so that it is not a case where external force is applied, can be produced by its own weight to rotate, thereby cutting off radiation, so that the g-ray source has automatically shut down in case of power failure intrinsic safety.

[0043] 本发明将X射线源和g射线源有机整合到一个集成的小型化检测系统中,通过射线源和探测器的升降或平移换位,可以将不同射线源与探测器两两组合,形成多达十几种检测模式,不同检测模式分别适合于检测不同对象、不同类型和尺寸的缺陷,满足不同的检测要求。 [0043] The present invention will be X-ray source and a g-ray source into one integrated organic miniaturized detection system, by lifting ray source and detector conversion or translation, different ray source and detector may be combined two by two, is formed up to a dozen detection mode, different detection modes are adapted to detect different objects, different types and sizes of defects, to meet the different requirements of detection. 以450kV X光机和Co-60 g射线源的组合为例,450kV X光机靶点小(可达0.4mm),福射强度高(距祀点I米处的剂量率可达几百mGy/min),对于等效质量厚度小于60mm铁的工件可以达到很高的空间分辨率(例如,与面阵探测器配合可达4.41p/mm);Co-60 g射线源射线能量高(平均能量1.25MeV),其射线穿透能力与4MeV加速器相当,适于检测等效质量厚度30〜130_铁的工件,可以达到0.1%的密度分辨率;利用g射线源射线输出强度稳定的特点,还可以对工件内部任意两点之间的距离进行测量,并检测工件内部任意局部区域的质量厚度在长时间内的微小变化。 In combination 450kV X-ray machines and Co-60 g-ray source for example, 450kV X-ray target small (up to 0.4mm), high-intensity radio fu (from point I worship at the dose rate of a few hundred meters mGy / min), for the mass equivalent thickness of less than 60mm iron workpiece may reach very high spatial resolution (e.g., planar array detectors in conjunction with up to 4.41p / mm); high Co-60 g-ray energy ray sources (average energy 1.25MeV), and its radiation penetration accelerator 4MeV quite adapted to detect an equivalent mass of the workpiece thickness 30~130_ iron, can reach 0.1% density resolution; using g-ray source output intensity and stability characteristics, measurements can also be the distance between any two points inside the workpiece, and detecting any small changes in mass thickness of the inner partial region of the workpiece for a long time. 如果选用微焦点X光机,还可以将系统的检测分辨率提高到几个微米的量级。 If you use microfocus X-ray machines, can also improve the resolution of the system to detect the order of several micrometers.

[0044] 实施例1 [0044] Example 1

[0045] 本实施例采用Co-60 g射线源和450keV小焦点X光机两种射线源,探测器采用面阵探测器、闪烁体固体线阵探测器和充气电离室气体线阵探测器。 [0045] The present embodiment employs a Co-60 g-ray source and the X-ray small focal 450keV two kinds of radiation sources, the detector plane array detector using scintillator array detector and the solid line inflator gas ionization chamber linear array detector. 所用Co-60射线源活度约3.7TBq (100居里),450keV X光机焦点尺寸0.4mm,最大管电流3.3mA。 The Co-60 radiation source activity with about 3.7TBq (100 Curie), 450keV X-ray focus size 0.4mm, the maximum tube current 3.3mA. 面阵探测器成像区尺寸409.6X409.6mm2,像素尺寸0.2X0.2mm2,固体线阵探测器采用CdWO4晶体作为闪烁体,像素尺寸0.4X5X30mm3。 Planar array detectors imaging area size 409.6X409.6mm2, pixel size 0.2X0.2mm2, linear array detector using a solid crystal as CdWO4 scintillator pixel size 0.4X5X30mm3. 气体线阵探测器采用充气电离室,以氙气为工作介质,充气压力3.5MPa。 A pneumatic linear array detector using gas ionization chamber, xenon gas as the working medium, the inflation pressure of 3.5MPa. g射线源屏蔽容器和前、后准直器均用密度大于18g/cm3的钨合金制成。 G-ray source shielding container before and after the collimator are made of a tungsten alloy density is greater than 18g / cm3 is formed. 射线源机架和探测器机架的升降或平移,以及工件转台的升降或双向平移采用直线导轨和伺服电机实现,其位置测量采用旋转编码器和光栅尺实现,重复定位精度小于IOmm;工件转台最小旋转步长15",重复定位精度小于2"。 Lifting or translating ray source and the detector chassis frame, and a workpiece elevating the turntable or bidirectional translational linear guide and servo motor to achieve that the position measured by the rotary encoder grating and implemented, repeatability of less than IOmm; workpiece turntable minimum rotational step 15 ", the positioning accuracy of less than 2 is repeated." 整个检测系统的整体尺寸为 The overall size of the entire detection system is

2.5mX1.8mX2.2m (长X宽X高),重约5吨。 2.5mX1.8mX2.2m (length X width X height), a weight of about 5 tons. 能检测等效质量厚度小于130mm铁、直径小于f500mm的工件,可以发现3cm铁板后30 μ m厚的薄铁片,可以发现不足20 μ m宽的微小裂缝或止口间隙。 Can be detected by mass equivalent thickness of less than 130mm iron, f500mm diameter smaller than a workpiece can be found 3cm iron thin iron sheet 30 μ m thick, it can be found in less than 20 μ m width micro-cracks or gaps spigot.

[0046] 本实施例将止口间隙和质量厚度微小变化的检测与鼓泡检测等检测任务分解开,由不同参数的探测系统和不同的检测方式完成。 [0046] The present embodiment will be minor changes stop and gap thickness and quality of bubbling detection and inspection tasks unbundled detection, performed by the detection system and the various parameters of the detection method.

[0047] 本实施例采用“Co-60源+大像素气体线阵探测器DR扫描成像”方式实现工件止口间隙和质量厚度微小变化的检测。 [0047] The present embodiment employs detection "Co-60 source gas + large pixel linear array detector DR Scan Imaging" minor variations of the workpiece locking manner and gap thickness and quality. 大像素探测器输出信号强,统计涨落小,有利于质量厚度变化的检测。 Large pixel detector output signal, small statistical fluctuation, facilitates the detection mass varying thickness. Co-60源射线强度能长时间保持稳定,操作简便,可靠性高;气体探测器漏电流小,稳定性高,温漂小、耐辐照。 Co-60 radiation source intensity can be stable over time, easy operation, high reliability; gas detector leakage current, high stability, low drift, resistance to radiation. 二者组合构成的DR扫描系统测量精度高,性能可长时间保持稳定,十分适合止口间隙和质量厚度微小变化的检测。 DR high measurement precision scanning system composed of a combination of both, stable performance can be maintained for a long time, very suitable for detecting small changes in the rabbet gap thickness and quality.

[0048] 本实施例采用“X光机+小像素固体线阵探测器CT断层成像”方式实现工件内部鼓泡检测。 [0048] The present embodiment employs "X-ray solid + small pixel linear array detector CT tomography" bubbled manner inside the workpiece detected. CT断层成像能获得被检客体的密度分布,能检测细微缺陷,并能对缺陷精确定位,是检测鼓泡和脱落的最佳手段。 CT tomographic imaging of the subject can obtain the density distribution of the object, a micro defect can be detected, and can accurately locate the defect is detected and the best means of bubbling shedding.

[0049] 本实施例的检测系统采用两种射线源(Co-60和450kV X光机)和三种探测器(小像素固体线阵探测器、大像素气体线阵探测器和微像素面阵探测器),组合使用以充分利用不同射线源和不同探测器的优点,更好地满足检测要求。 [0049] The embodiment of the detection system of the present embodiment using two radiation source (Co-60 and 450kV X-ray) and three detectors (pixels solid small linear array detector, a gas large pixel linear array detector and a micro pixel area array detector), used in combination to take advantage of different advantages of different ray source and the detector, to better meet the testing requirements. X光机辐射强度大,源焦点尺寸小,有利于提高成像系统的分辨能力。 X-ray radiation intensity, focal spot size small source, help to improve the resolution of the imaging system. 钴-60源单能性好,不存在射束硬化问题,并且射线能量较高,穿透能力更强,可以检测质量厚度更大的客体。 Cobalt-60 source unipotent good beam hardening is not a problem, and high energy radiation, more penetration, greater mass thickness can be detected object. 小像素固体线阵探测器能更好地屏蔽散射线,探测效率更高,能得到更加清晰的图像;微像素面阵探测器像素尺寸更小,能达到更高的空间分辨率,且一次扫描即可获得客体的三维图像,成像更快速。 Solid small pixel linear array detector to better shield the scattered radiation, higher detection efficiency can be obtained clearer images; micro pixel array detector plane pixel size smaller, to achieve higher spatial resolution, and scan a three-dimensional object image can be obtained, a more rapid imaging.

[0050] 本实施例将以上两种射线源和三种探测器集成于同一检测平台,采用上下移位布局和组件化、模块化设计模式,实现了不同射线源与不同探测器的切换组合,将不同的检测方式有机组合成一体,形成了一套综合性检测系统。 [0050] The present embodiment three kinds of two or more ray source and the detector in one single detection platform, shifting up and down the layout and components, modular design pattern, to achieve a combination of different switching-ray source with a different detector, the different detection methods are an integrated unit, forming a comprehensive inspection system.

[0051] 以上对本发明具体实施方式作了详细说明,但本发明并不局限于上述实施方式,如可以采用小型化的X射线加速器作为中高能X射线源。 [0051] made of the above embodiments of the present invention is described in detail, but the present invention is not limited to the above embodiments, may be employed as a miniaturized X-ray and high energy accelerators as X-ray source. 即使对本发明做出各种变化,只要是基于本发明的精神实施的步骤或流程,以及由此构成的检测系统,就应理解为均落在本发明保护范围内。 Even make various variations of the present invention, as long as the spirit of the invention or embodiment of the process step, and a detection system based on the configuration thus, should be understood to fall within the scope of the invention.

Claims (10)

1.一种组合式射线无损检测方法,该方法利用射线对待检测工件进行照射,利用探测器接收穿过工件的射线,并转换成数字信号,然后对所述数字信号进行处理,得到工件的辐射图像,其中: -射线源采用包含Y射线源和X射线源的组合式射线源,探测器采用包含固体线阵探测器、气体线阵探测器和面阵探测器的组合式探测器,并通过切换不同的射线源和探测器组成不同的检测单元,实现对工件的DR扫描成像或断层CT成像或锥束CT成像; -所述组合式射线源和组合式探测器,以及工件转台均安装固定在同一刚性基座上; -所述组合式射线源的射线输出侧设置有前准直器,该前准直器将射线准直成扇形束或锥形束,所述组合式探测器的射线输入侧设置有对射线做进一步准直处理的后准直器;其特征在于: 所述线阵探测器的后准直器(3)为圆弧线结构,其准直缝(22 1. A combined-ray non-destructive testing method using the radiation to be detected is irradiated with the workpiece by the workpiece through the detector receives radiation, and converted into a digital signal, the digital signal is then processed to obtain the radiation of the workpiece image, wherein: - a modular radiation source comprising a radiation source and a Y-ray source X-ray source, the detector probe comprising a solid with modular linear array detector, and a linear array detector gas panel detector, and by switch between different ray source and detector means for detecting a different composition, to achieve the workpiece DR imaging or tomographic scan cone-beam CT imaging or CT imaging; - the combined-ray source and detector combination, the turntable and the workpiece are fixed on the same rigid base; - an output side of the combined radiation ray source is provided with a front collimator, the collimator before the ray collimator into fan-beam or cone-beam, the combined radiation detector radiation-input side is provided with a collimator to make further collimated; characterized in that: the structure after the arc line linear array detector collimator (3) to which a collimator slit (22 )的宽度为探测器单元(21)宽度的1/2、1/3或1/4,数量与探测器单元(21)的数量相同;在进行线阵探测器DR成像时,所述后准直器(3)可整体沿第二圆弧线(25)双方向蠕动,每蠕动一次就获取一组投影数据,每次蠕动的距离为准直缝(22)的宽度,从而使线阵探测器DR成像的空间分辨率达到探测器单元(21)宽度值的1/2、1/3或1/4。 ) Width of the detector unit (21) of width 1 / 2,1 / 3 or 1/4, the same number detector unit (21); a linear array detector during DR imaging, after the quasi- a collimator (3) may be integrally along a second arc line (25) sides, each peristaltic once to obtain a set of projection data creep, creeping distance collimated each seam (22) has a width such that the linear array probe DR is the spatial resolution of the imaging detector unit 1 / 2,1 / 3 or 1/4 (21) width value.
2.根据权利要求1的检测方法,其特征在于:所述前准直器内部设有水平喇叭形狭缝和方锥形开孔,可通过水平移位进行切换,将射线准直成扇形束或方锥形束,分别用于线阵探测器或面阵探测器成像。 2. A detection method according to claim 1, wherein: the front interior collimator slit and provided with a horizontal side tapered horn aperture, can be switched by the horizontal shift, the collimated ray fan beam or square cone-beam, respectively, or a linear array detector imaging plane array detector.
3.一种应用权利要求1所述方法的组合式射线无损检测系统,包括: -一个刚性基座,基座上依次间隔排列有射线源支架、工件转台、探测器支架; -所述射线源支架上设置有包含Y射线源和X射线源的组合式射线源,以及用于将不同射线源移入工作位置的切换机构,和对射线源进行上下、前后、左右和旋转操作的机构; -所述探测器支架上设置有包含固体线阵探测器、气体线阵探测器和面阵探测器的组合式探测器,以及用于将不同探测器移入工作位置的切换机构,和对探测器进行上下、前后、左右和旋转操作的机构; -所述射线源支架上设置有能将射线源输出的射线准直成扇形射线束或锥形射线束的前准直器,探测器支架上设置有对射线做进一步准直处理的后准直器; 其特征在于: 所述线阵探测器的后准直器(3)为圆弧线结构,其准直缝(22)的宽度为探测器 The combined application of a method as claimed in claim 3. A non-destructive testing-ray system, comprising: - a rigid base, the base having successively spaced stent-ray source, the workpiece turret, the detector support; - the radiation source is provided on the bracket with a modular Y-ray source comprises an X-ray source and the radiation source, and a radiation source for different working position into the switching mechanism, and a source of radiation and down, front and rear, and left and right rotation operation mechanism; - the there is provided on the detector support said linear array detector comprises a solid, combined linear array detector and a gas detector area array detector, and a switching mechanism for different probe into working position, up and down and the detector , front and rear, and left and right rotation operation mechanism; - provided with a radiation source capable of output ray collimator to said radiation source holder fan beam or cone beam collimator before, the detector is provided with a bracket ray is further collimated after doing a collimator; wherein: the rear structure of the arc line linear array detector collimator (3), for which the collimator slit width (22) of the detector 元(21)宽度的1/2、1/3或1/4,数量与探测器单元(21)的数量相同;在进行线阵探测器DR成像时,所述后准直器(3)可整体沿第二圆弧线(25)双方向蠕动,每蠕动一次就获取一组投影数据,每次蠕动的距离为准直缝(22)的宽度。 Element (21) of a width of 1 / 2,1 / 3 or 1/4, the same number detector unit (21); a linear array detector during DR imaging, a collimator (3) can be second arc along the entire line (25) sides, each peristaltic once to obtain a set of projection data creep, creeping distance collimated each seam (22) width.
4.根据权利要求3所述的检测系统,其特征在于:所述前准直器内部设有水平喇叭形狭缝和方锥形开孔,可通过水平移位进行切换,将射线准直成扇形束或方锥形束,分别用于线阵探测器或面阵探测器成像。 The detection system according to claim 3, wherein: the front interior collimator slit and provided with a horizontal side tapered horn aperture, can be switched by the horizontal shift, the collimated rays fan-beam or cone-beam side, respectively, to linear array detector or imaging plane array detector.
5.根据权利要求3或4所述的检测系统,其特征在于:所述Y射线源是Co-60、Cs-137或Ir-192放射性同位素Y射线源。 The detection system of claim 3 or claim 4, wherein: said radiation source is a Y Co-60, Cs-137 or Y radioisotope Ir-192 radiation source.
6.根据权利要求3或4所述的检测系统,其特征在于:所述X射线源是小焦点X光机、微焦点X光机和/或X射线加速器。 6. A detection system according to claim 3 or claim 4, wherein: said X-ray source is a small focal spot X-ray machines, micro-focus X-ray and / or X-ray accelerator.
7.根据权利要求3或4所述的检测系统,其特征在于:所述面阵探测器是非晶硅、非晶硒或CMOS面阵探测器。 The detection system of claim 3 or claim 4, wherein: said detector is a planar array of amorphous silicon, amorphous selenium or CMOS area array detector.
8.根据权利要求3或4所述的检测系统,其特征在于:所述气体线阵探测器是充气电离室、多丝正比室或盖格计数管线阵探测器。 Detecting system according to claim 3 or claim 4, wherein: said linear array detector is a gas ionization chamber inflatable, multi-wire proportional chamber or Geiger counter line array detectors.
9.根据权利要求3或4所述的检测系统,其特征在于:所述固体线阵探测器是固体闪烁体线阵探测器或半导体线阵探测器。 9. A detection system according to claim 3 or claim 4, wherein: the solid line is a solid scintillator array detector linear array detector or a semiconductor line array detector.
10.根据权利要求9所述的检测系统,其特征在于:所述固体闪烁体线阵探测器的闪烁体是Nal、Csl、CdW04、LaBr3 或LaCl3。 10. The detection system according to claim 9, wherein: said solid scintillator linear array detector is a scintillator Nal, Csl, CdW04, LaBr3 or LaCl3.
CN 201210261284 2012-07-26 2012-07-26 Combined nondestructive testing method and combined nondestructive testing system CN102768219B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201210261284 CN102768219B (en) 2012-07-26 2012-07-26 Combined nondestructive testing method and combined nondestructive testing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201210261284 CN102768219B (en) 2012-07-26 2012-07-26 Combined nondestructive testing method and combined nondestructive testing system

Publications (2)

Publication Number Publication Date
CN102768219A CN102768219A (en) 2012-11-07
CN102768219B true CN102768219B (en) 2014-07-30

Family

ID=47095692

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201210261284 CN102768219B (en) 2012-07-26 2012-07-26 Combined nondestructive testing method and combined nondestructive testing system

Country Status (1)

Country Link
CN (1) CN102768219B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103040480A (en) * 2012-12-11 2013-04-17 北京天海元科技有限公司 Digital X-ray medical treatment image system
US9772427B2 (en) * 2013-11-14 2017-09-26 Tsinghua University Multiple-power multiple-dosage accelerators, rapid examination systems and rapid examination methods thereof
CN104768315B (en) * 2014-01-08 2017-10-03 中国科学院高能物理研究所 Collimator apparatus and double detection CT systems
CN103767726B (en) * 2014-02-25 2016-01-06 重庆大学 A fast super-resolution x-ray imaging and fluorescence ct reconstruction system and method
CN104297813A (en) * 2014-09-12 2015-01-21 何山 Fixing device for pass-type human body security inspection equipment and working face
CN104198507B (en) * 2014-09-16 2017-06-16 北京一体通探测技术有限公司 Shield the shutter device and ray scanning imaging system of ray
CN105092611A (en) * 2015-02-11 2015-11-25 华侨大学 X-ray multi-purpose nondestructive flaw detection device and workpiece detection method thereof
CN104677924A (en) * 2015-02-11 2015-06-03 东莞市嘉仪自动化设备科技有限公司 360-degree nondestructive seaming detection equipment and 360-degree nondestructive seaming detection method
CN105352981A (en) * 2015-11-16 2016-02-24 国网辽宁省电力有限公司丹东供电公司 Electric transmission line composite material tower nondestructive testing device
CN105355118B (en) * 2015-11-17 2018-03-13 南京大学 The industry CT detection means and its detection method of physical simulation experiment model are hidden in construction control
CN105403579A (en) * 2015-12-16 2016-03-16 天津三英精密仪器有限公司 CT detection suitable for long sample
CN105726054A (en) * 2016-05-09 2016-07-06 中国科学院苏州生物医学工程技术研究所 Double-circular arc track CT (computed tomography) scanner

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1076546A (en) 1993-03-18 1993-09-22 清华大学 Gas-ionization high energy x.r radiation imaging array detecting device
CN1343883A (en) 2001-09-21 2002-04-10 清华大学 Detecting method and equipment for X-or gamma-radiation imaging
CN1460849A (en) 2003-06-27 2003-12-10 清华大学 Gamma radiation imaging nondestructive inspection system for bag, box or baggage
GB2368764B (en) 1999-07-23 2004-02-18 Univ Tsinghua Digital radiography inspection apparatus for large object
CN2860349Y (en) 2005-09-16 2007-01-24 北京大学 Processing system three-dimensional conical bundle CT image rebuilding
CN1994230A (en) 2005-12-31 2007-07-11 清华大学 X-CT scanning system
CN101661806A (en) 2008-08-27 2010-03-03 北京固鸿科技有限公司 Collimating slit module, manufacturing method thereof, collimator and radiation imaging check system
US7949095B2 (en) 2009-03-02 2011-05-24 University Of Rochester Methods and apparatus for differential phase-contrast fan beam CT, cone-beam CT and hybrid cone-beam CT

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100718671B1 (en) * 2005-07-05 2007-05-15 (주)디알젬 X-ray Cone Beam CT scanner comprising 2-dimensinal reference detector and chollimator for reference detector

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1076546A (en) 1993-03-18 1993-09-22 清华大学 Gas-ionization high energy x.r radiation imaging array detecting device
GB2368764B (en) 1999-07-23 2004-02-18 Univ Tsinghua Digital radiography inspection apparatus for large object
CN1343883A (en) 2001-09-21 2002-04-10 清华大学 Detecting method and equipment for X-or gamma-radiation imaging
CN1460849A (en) 2003-06-27 2003-12-10 清华大学 Gamma radiation imaging nondestructive inspection system for bag, box or baggage
CN2860349Y (en) 2005-09-16 2007-01-24 北京大学 Processing system three-dimensional conical bundle CT image rebuilding
CN1994230A (en) 2005-12-31 2007-07-11 清华大学 X-CT scanning system
CN100435733C (en) 2005-12-31 2008-11-26 清华大学;同方威视技术股份有限公司 X-CT scanning system
CN101661806A (en) 2008-08-27 2010-03-03 北京固鸿科技有限公司 Collimating slit module, manufacturing method thereof, collimator and radiation imaging check system
US7949095B2 (en) 2009-03-02 2011-05-24 University Of Rochester Methods and apparatus for differential phase-contrast fan beam CT, cone-beam CT and hybrid cone-beam CT

Also Published As

Publication number Publication date
CN102768219A (en) 2012-11-07

Similar Documents

Publication Publication Date Title
Wang et al. Material separation in x‐ray CT with energy resolved photon‐counting detectors
US6563906B2 (en) X-ray compton scattering density measurement at a point within an object
US6965661B2 (en) Radiological imaging apparatus and radiological imaging method
EP1579245B1 (en) Radiation scanning units including a movable platform
RU2444723C2 (en) Apparatus and method of inspecting objects
US4384209A (en) Method of and device for determining the contour of a body by means of radiation scattered by the body
US6049586A (en) Non-destructive inspection apparatus and inspection system using it
AU2007252161B2 (en) Detector array and device thereof
BE1017033A3 (en) Method and equipment for distincting materials by using quick neutrons and continually spectral x-rays.
JP2006105982A (en) Linear array detector system and inspection method
US6873682B2 (en) Exposure control in scanning-based detection of ionizing radiation
EP1893984A2 (en) Radiation scanning units with reduced detector requirements
US20020018543A1 (en) Device and method related to X-ray imaging
US20030031295A1 (en) Arrangement for measuring the pulse transmission spectrum of x-ray quanta elastically scattered in a scanning area for containers
CN1886093A (en) Tomographic apparatus and method
JP2008514965A (en) Semiconductor crystal high-resolution imaging device
CN102460133B (en) Computer tomographic workpiece measuring device
US20090323889A1 (en) Xrd-based false alarm resolution in megavoltage computed tomography systems
JP2008501463A (en) Coherent scattering computed tomography apparatus and method
CN101569530B (en) X- ray detector and x- ray apparatus ct
CN1112583C (en) Digital radiation imaging detector for large quest materials
KR20090052904A (en) Neutron moderator, neutron irradiation method, and hazardous substance detector
Skarsgard et al. Spectral flux density of scattered and primary radiation generated at 250 kv
EP0705420B1 (en) Online tomographic gauging of sheet metal
US4821304A (en) Detection methods and apparatus for non-destructive inspection of materials with radiation

Legal Events

Date Code Title Description
C06 Publication
C10 Request of examination as to substance
C14 Granted