Computational imaging

 

(57) Abstract:

Usage: the invention relates to measuring technique and is intended to assess the quality of parts in the manufacture and repair, specifically to flaw detection using computational topography. Essence: computer tomograph includes a radiation source with the fan beam scanner, engaged workers move the control object and a matrix of detectors located in the fan beam at the object of control. The detectors of the matrix is used micrometric detectors with single detectors, the size of which is along the direction of the scan is to the second part of the width of the detector matrix, where K is the desired zoom scale local tomography. 1 Il.

The invention relates to measuring technique and is intended to assess the quality of parts in the manufacture and repair, and specifically to testing using computer tomography.

Known circuits computing scanners used for inspection of parts and products, which is receiving radiation, their registration and subsequent processing of information received from the detectors /1/.

However, this device has the disadvantage that it is impossible to obtain a tomogram of the local zone in the testing object.

The aim of the invention is to increase the resolution of the device in a selected local area of the test object.

The goal is achieved by computing the scanner containing the radiation source with the fan beam scanner which move the test object, a matrix of detectors located in the fan beam at the object of control, and the control unit and the control unit and information processing, the input of which is connected to the outputs of the detectors, the detectors of the matrix of detectors are used for more chips detectors with a single detector whose size along the scanning direction is 1/K of the width of the detector main matrix, where K is the desired zoom scale local tomography.

In Fig. 1 given the proposed mouth of the scanner 3, engaged workers moving object 4 control matrix 5 of the detectors 6, located in the fan beam for the object 4 control and block 7 of the control and information processing, the input of which is connected to the outputs of the detectors 6 and the scanner 3.

The proposed device operates as follows.

Radiation from a point source 1 passes through the object 4 control moved by the scanner 3, carrying out the reciprocating movement and discrete rotation of the inspection object, and falls to multi-channel matrix 5 detector 6. After the implementation of the yoke, i.e., the passage of the object in one direction, we have the number of projections N on the number of detectors in a matrix, each angular projection differs from adjacent to the angle between the directions of the focus of the source centre neighboring detectors. Thus, in one traverse collected projection data in aN angle Because all you need to collect data in angle 180othe number of traverses is equal to 180/ N and after each traverse the object is rotated around its axis by the angle N While the full data set is based tomography of the entire cross-section of the object.

When constructing a tomogram not the entire cross-section, and the local C is, the eat normal imaging.

For example, the format of the reconstructed cross-section in the normal imaging 512512. Then the size of the item (Pixela) will be D/512, where D is the diameter of the object. If the size of the local CT D/K, the element size in the same image format (512512) must be D/512 K.

For the implementation of local tomography should automatically replace the original matrix of detectors with the same number of detectors and with the same arc of a circle, but the size of a single detector must be reduced To time. But then the angle of vision of the matrix and tolerance decreases in time. Thus it is necessary to consider two cases: when the local area is located in the center section and being offset from the center.

If the zone is located asymmetrically in the center section, it is sufficient to determine the radius of the local area and scan be made as follows: table object moves rapidly up until extreme ray of the radiation beam in the corner of N / K is not suitable to the edge of the local zone. Then enter a reduced speed, such that the time to traverse the local zone is equal to the time traverse the entire cross-section in the normal mode. Next is the turn of the zone neosesimmetrichnom, the control computer must for each traverse to calculate the position of the point at which to begin slow motion scanner, and receipt point at which to begin slow motion scanner and obtaining projection data, because for each traverse the position of this point is different.

After dialing the full data packet at an angle 180oreconstruction of the tomogram of the local zone is the same as for normal mode.

The proposed device was tested in a model, and showed an increase in the geometric resolution is proportional to the number of detectors in micrometric replacing each of the detectors of the main matrix.

Computational imaging, which contains the radiation source with the fan beam scanner, engaged workers moving object control, the matrix of detectors located in the fan beam at the object of control, and the control unit and information processing, the input of which is connected to the outputs of the detectors and of the scanner, wherein the detectors of the matrix of detectors is used micrometric detectors with single detectors, the size of which is along the direction of the scan is To the second part of the width

 

Same patents:

The invention relates to accelerator technology, particularly to a technique of measuring the parameters of charged particle beams

The invention relates to the field of computer technology and, in particular, to techniques for the study of mechanical robots with automatic recording of three-dimensional displacements of the actuators of the robot and can be used both in the home and in industrial process lines wide profile, for example, in metal processing, microelectronics, as well as in surgery and microsurgery

The invention relates to the field of materials research radiation methods and can be applied in the field of peaceful use of monitoring compliance with international agreements

The invention relates to the field of experimental nuclear physics, more specifically to the field of dosimetry of gamma radiation, and can be used to search and identify the location of point and distributed sources of gamma radiation in the conditions of the contaminated area while determining the intensity of the gamma radiation source and the intensity of the background gamma radiation

The invention relates to high energy physics and can be used in nuclear physics and cosmic rays for particle identification by ionization loss and transition radiation

The detection unit // 2056060
The invention relates to radiation measurements, in particular to the structures of the detecting unit, for example, charged particles

The invention relates to a technique of physical experiment, in particular to accelerator technology, and can be used at accelerators of various types to stabilize the beam position on the target

The invention relates to transducers of the parameters of the electron beam of low energy (10 MeV) and can be used in accelerator technology, radiation technology, Metrology electron radiation

The invention relates to radiation testing, and more specifically to devices computing x-ray tomography of objects, for example, cast cooled blades for gas turbine engines

FIELD: test and measuring technique.

SUBSTANCE: device can be used for measuring thickness of layers of bimetal band, which band is used in thermometers, thermal controllers. Method can be used in mechanical engineering, power engineering and other branches of industry. Device has digital calculator. Sizes of slots of collimators in radiator and in the second chamber are made in cross-sectional cut within 2-4 mm and in longitudinal cut of (1.1-1.2)d, where d is width of band in cross-sectional cut. Slots are oriented in parallel to each other and they focused with their apertures to the same cross-section of band. Ability of scanning within sector of sign-polar angle of +-α is provided for the second chamber inside plane being formed by normal line of direct radiation flux, which normal line is brought into coincidence with longitudinal axis of symmetry of direct flux, and of longitudinal axis of band, which axis crosses between its layers and which axis crosses longitudinal axis of symmetry of direct flux within angle which closes width of aperture of direct X-ray flux at cross-sectional cut of band, which cross-sectional cut is radiated by direct flux. Output of second chamber is connected with input of digital calculator which has output connected with input of processor.

EFFECT: high geometric resolution of material of bimetal band's layers with different structure and density of materials.

2 dwg

FIELD: petrochemical industry, particularly to increase reservoir recovery, oil reserve calculation and effective oil field development control.

SUBSTANCE: method involves performing joint filtration of mineralized water and oil through core sample; measuring intermediate intensity of X-radiation passed via the sample; measuring X-radiation intensity change as sample has 100% water saturation; measuring X-radiation passed through dry sample and calculating water saturation from the following formula: where α is ratio between mass X-radiation absorption factors in oil and mineralized water; β is coefficient characterizing sample water saturation change as temperature changes.

EFFECT: increased reliability and measurement accuracy.

1 dwg, 1 tbl

FIELD: physics, measurement.

SUBSTANCE: multispectral X-ray scanner that contains source of ionising radiation, collimator in the form of longitudinal circuit intended for creation of flat radiation beam and device for registration of radiation beam, which includes electronics for data reading and processing, luminescent screen and one bar of photoreceiving modules that contain photodiodes that are optically conjugated with luminescent screen, which differs by the fact that device of radiation beam registration contains at least two luminescent screens that are located in radiation beam and separated from each other with complementary filter in the form of two plates made of light metal foil and plate made of heavy metal foil installed between them, and at least two bars of photoreceiving modules, which are installed outside flat radiation beam, every of which is optically conjugated with one luminescent screen.

EFFECT: expansion of X-ray device operation spectral range and division of this range into several spectral zones.

3 dwg

FIELD: physics.

SUBSTANCE: interaction of multienergy radiation is carried out with the checked object, measuring and recording the measured quantities after interaction of multienergy radiation with the checked object, substitution of a part of the measured values in preliminary determined calibration function for obtaining of the information containing major importance of the performance of object and more exact determination of the performance of material of object by application of a set of functions, suitable for energy line corresponding to the gained information.

EFFECT: possibility of identification of various materials in a wide range of atomic numbers.

32 cl, 8 dwg

FIELD: physics, radiography.

SUBSTANCE: seeds are installed between source of X-ray radiation and image receiver, focus spot of X-ray radiation source is formed with size that does not exceed 0.01 mm (microfocus tube). Inherent blurriness of image receiver does not exceed 0.2 mm. It makes it possible to reduce effect at quality of X-ray image of screen component of image blurriness. Distance between seed and image receiver is defined as result of product of linear size of receiver sensitive area and distance from focus spot to seed divided into seed size.

EFFECT: provision of possibility to detect criteria of low quality grain, image specific sizes of which do not exceed 0,1 mm.

6 dwg

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field and can be used for manufacturing of tanks of liquefied gas, low-temperature and cryogenic equipment, facilities for receiving of liquefied gas, rocket envelopes and tanks for keeping of propellant from steel 01X18H9T. Steel sheet is subject to effect of penetrating radiation. Integral width X-ray line 111, measured on characteristic radiation CoKα with overlapping probability 2.18·10-5, is 0.204±0.003 angular degree.

EFFECT: increasing of steel yield point.

8 tbl, 1 ex

FIELD: mining.

SUBSTANCE: method consists in preparing of investigated sample form core of oil-water-bearing rock, in modeling reservoir condition in sample, in determination of intensiveness of Roentgen radiation at scanning of dry investigated sample of rock, in saturating it with model of reservoir water and in determination of intensiveness of Roentgen radiation at scanning of investigated sample at 100% water saturation, in evaluation of residual water saturation, in filtration of oil and agent, in scanning investigated sample of rock with Roentgen radiation, also when filtrating oil, gas is used as agent, further method consists in additional determination of intensiveness of Roentgen radiation at scanning sample of rock saturated with three phases, that is with residual water saturation, and with intermediate oil and gas saturation; after that oil saturation is evaluated from corresponding mathematic formula.

EFFECT: increased reliability and accuracy of evaluation of oil saturation of rock.

2 cl, 1 tbl, 2 dwg

FIELD: veterinary.

SUBSTANCE: method includes determination of value of bone tissue mineral density. Computer processing of scanned roentgenogram of examined part of bone system is carried out at standard roentgenogram of healthy animal and at roentgenogram of examined animal, on each of which zones of interest are singled out: "growth zone part", "cortical layer part", "spongy substance part". In each of zones of interest optic density is determined, which is used to calculate coefficient of mineralisation of bone tissue of examined animal, which, in its turn, is used to calculate coefficient of ossification of examined animal. If values of ossification coefficient are 0.95 and higher complete mineralisation is determined, if values are 0.95 - 0.75 - middle degree of mineralisation, if it is 0.75 and lower - low degree of mineralisation.

EFFECT: method is simple and efficient in implementation.

1 ex, 4 dwg

FIELD: printing industry.

SUBSTANCE: method for detection of differential criteria in documents produced by methods of electrophotographic printing with application of magnetic toners consists in performance of documents research by detection of magnetite X-ray maximum broadening on X-ray pictures and in further comparative analysis of results.

EFFECT: improved efficiency in identification of documents manufactured by methods of electrophotographic printing with application of magnetic toners.

1 tbl, 1 ex

FIELD: measuring engineering.

SUBSTANCE: invention refers to X-ray equipment. The method consists in the following: by calculation and before an experiment there is selected an optimal value of θ angle between velocity of fast electrons and direction of quantum escape whereat spectre of slowing-down radiation is concentrated in the region of low frequencies. Also position of maximum of coherent spike is measured experimentally. Additionally, position of this maximum as function of dimension and shape of grain is calculated theoretically. Notably, values of theoretical parametres are chosen to achieve the best concurrence of spectres of calculated and measured spikes.

EFFECT: evaluation of grain dimension in ultra-fine-dispersed medium (nano material).

2 dwg

Up!