CN104932002A - X-ray detection system performance test system - Google Patents
X-ray detection system performance test system Download PDFInfo
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- CN104932002A CN104932002A CN201510158264.4A CN201510158264A CN104932002A CN 104932002 A CN104932002 A CN 104932002A CN 201510158264 A CN201510158264 A CN 201510158264A CN 104932002 A CN104932002 A CN 104932002A
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Abstract
An X-ray detection system performance test system of the present invention comprises a radiation source vacuum chamber, a to-be-tested product vacuum chamber, an X-ray transmission chamber, an X-ray source, an X-ray spectral calibration device, an X-ray spectrometer arrangement, an X-ray attenuation device and a vacuumizing device. X-rays are generated in the radiation source vacuum chamber, are approximatively parallel after the long-distance transmission in the X-ray transmission chamber, and can be used as an X-ray source of the to-be-tested product detection. In the radiation source vacuum chamber, the X-ray spectral calibration device can calibrate the X-ray radiation spectrum bands accurately, and the X-ray spectrometer arrangement can extract the multispectral X-rays, thereby guaranteeing the single to-be-tested product detection spectrum band. The X-ray attenuation device can carry out the attenuation of different grades on the X-rays. The X-ray detection system performance test system is a set of comprehensive detection system, and can carry out the comprehensive performance test on the X-ray detection products.
Description
Technical field
The invention belongs to X ray field, be specifically related to a kind of performance test methods, particularly X ray produces technology, X ray light splitting technology and X-ray attenuation technology.
Background technology
X ray extensively exists in space, and particularly when the active outburst of Astronomical Phenomena, X ray can produce in a large number, in astronomical sight, be often observed record.In x-ray imaging, the Qian De of the U.S. of launching for 1999 draws astronomical observatory and successful European newton astronomical observatory occurs for 2000 is the X ray astronomical telescope that performance is best in the world at present, and the work of more than ten years has helped the mankind to have recorded the X ray event of large quantity space.
Except imaging, also have a class X ray movable with the existence of x-ray photon form, X-ray detection is called to the record of this kind of chronometer phenomenon.International existing relevant aerospace unit has carried out the development work of space X X-ray detection X load, and corresponding load performance test job is synchronously carried out.
Britain Lai Chesi especially big space center, Dutch Cosine Research BV company, European Space Agency, French Photonis SAS company have developed MPO device, and this MPO device is arranged on ESA Mercury component detection instrument MIXS, for focal imaging.
Wherein, the especially big Xue Deng unit of Lai Chesi reports MPO relevant test method, and test job is at Britain Lai Chesite Implementation of College.Adopt parallel vacuum tube to carry out integer to the X ray that X-ray tube produces in test, the X ray light beam dispersed is become parallel X-ray light beam.Wherein vacuum tube is for reducing the energy loss of X ray in transmitting procedure.The x-ray source pin hole adopting X-ray tube to produce blocks, angle 2 ".Testing apparatus and parameter are parallel vacuum pipe range 20m, parallel vacuum tube vacuum-degree 1 × 10
-6mbar, X-ray tube illuminant characterization spectrum 1.59keV, aperture stop size 1mm.This test macro testable target spectral coverage is single, and the method for there is no meets the demand to the detection of different x-ray spectral coverage.
Cosine Research B.V company, ESA, Photonis SAS company, horse general etc. the X-ray detection system of unit consolidation research and development on synchrotron BESSY II Physikalisch-TechnischeBundesanstalt station, Berlin, carry out the test of X ray wave band.In testing apparatus, X-ray source spot size after diaphragm, monochromator crystal is 50 μm, and the X ray light beam after Shape correction is transferred to instrument room by vacuum tube, and wherein, vacuum tube has 3 and takes out pumping plant.Synchrotron radiation light spacing MPO exemplar 123.6m.The x-ray source of angle of divergence 0.8arcmin is irradiated to X-ray detection system after the vacuum tube of 123.6m.Testing apparatus and parameter are spot size: 50 μm, beam divergence angle 0.8arcmin, parallel vacuum pipe range 123.6m.The length of this test macro is large, and floor area is large, construction and maintenance cost intensive.
Beijing Normal University adopts multiple capillary collimating apparatus (capillary optical arrays) to carry out collimation integer to the X ray light beam dispersed.The light transmitting fiber being conveyed through radius-of-curvature different of X ray has come, and namely X ray produces multiple total reflection in light transmitting fiber inner wall surface, propagates into the other end from one end of optical fiber, and changes its direction of propagation with the bending of optical fiber.X ray light transmitting fiber and hollow capillary vessel, normally drawn by glass material, the reasonable combination of a large amount of X-ray kapillary just defines X ray lens.Due to process technology limit, the spot size about 5 ~ 6mm after the multiple capillary collimating device collimation of research group of Beijing Normal University, the angle of divergence is less than 10mrad.This mode can only collimate the X ray of small scale area, and the X ray larger to irradiated area cannot collimate, and does not possess detection performance.
Summary of the invention
Technical matters to be solved by this invention is: overcome the deficiencies in the prior art, provides a kind of X-ray detection system performance testing system, can realize multispectral section of X ray selection, spectrum calibration and X-ray intensity decay, and the characteristic of meeting spatial X-radiation.
Technical scheme of the present invention is: a kind of X-ray detection system performance testing system, comprises radiation source vacuum chamber, product vacuum chamber to be measured, X ray transmission cavity, x-ray source, X ray spectrum calibration device, x-ray spectrometry device, X-ray attenuation device, vacuum extractor;
Described radiation source vacuum chamber is placed with test platform and the cold screen of decontamination, and test platform is placed with x-ray spectrometry device, and the cold screen of decontamination is for keeping working temperature; Radiation source vacuum chamber has electrical interface flange, vacuum-pumping pipeline flange, X ray transmission cavity interface, caliberating device interface; Radiation source vacuum chamber is connected with external power source by electrical interface flange, and radiation source vacuum chamber is connected with vacuum extractor by vacuum-pumping pipeline flange; Radiation source vacuum chamber is connected with X ray spectrum calibration device by caliberating device interface, carries out Real-Time Monitoring and demarcation when X ray spectrum calibration device is used for work to X ray spectral coverage;
Described product vacuum chamber to be measured is placed with test platform and the cold screen of decontamination, and test platform is placed with X-ray detector, and the cold screen of decontamination is for keeping working temperature; Radiation source vacuum chamber has electrical interface flange, vacuum-pumping pipeline flange, X ray transmission cavity interface; Radiation source vacuum chamber is connected with external power source by electrical interface flange, and radiation source vacuum chamber is connected with vacuum extractor by vacuum-pumping pipeline flange;
Described X ray transmission cavity comprises 6 main pipelines and 2 corrugated tubes regulate pipeline, and putting in order from left to right is followed successively by supervisor, supervisor, corrugated tube adjustment pipeline, supervisor, supervisor, corrugated tube adjustment pipeline, supervisor, supervisor; Supervisor's material is stainless steel, and inwall carries out polishing; One end of X ray transmission cavity is connected with radiation source vacuum chamber, and the other end is connected with product vacuum chamber to be measured;
Before test starts, process is vacuumized to radiation source vacuum chamber, product vacuum chamber to be measured, X ray transmission cavity; Test starts the x-ray source be placed in radiation source vacuum chamber and produces X ray, x-ray spectrometry device in radiation source vacuum chamber on test platform extracts X ray target spectral coverage, carry out realizing less parallel after long range propagation through X ray transmission cavity again, finally by the X-ray detector on test platform in product vacuum chamber to be measured, X ray is detected.
Described X ray transmission cavity total length is 28m.
Described x-ray source is double anode X-ray tube.
Described X ray spectrum calibration device comprises x-ray spectrometer and X ray CCD.
Described x-ray spectrometry device chooses transmission-type X-ray grating, and screen periods is 500nm, area 10 × 0.1mm
2, golden thickness 500nm, dutycycle 0.4 ~ 0.6, grid line shape is rectangle, useful area 70%.
Described X-ray attenuation device is chosen at the laminated film that on Kapton, AM aluminum metallization film is formed.
The present invention's advantage is compared with prior art:
The invention provides a kind of X-ray detection system performance testing system, novel part embodies a concentrated reflection of can virtual space X-radiation characteristic, comprises X-ray radiation dosage level, the X-radiation depth of parallelism.Because X-ray wavelength is short, very easily by ABSORPTION AND SCATTERING, so be a difficult problem for the collimated probe of this spectral coverage photon.The present invention uses the mode of long range propagation to achieve the collimate in parallel of X ray, meets the depth of parallelism characteristic of space radiation.The X-ray detection in space is all single photon magnitude level usually, and how decaying to the strong X-radiation that x-ray source produces, reaching single photon level is another difficult problem.The present invention uses laminated film to realize controlling X-ray intensity, and realizes differential declines coefficient by careful design thicknesses of layers.The present invention can as the performance test general-purpose platform of such detection system, and the difference that can detect spectral coverage for load adjusts, and has good load pardon.
Accompanying drawing explanation
Fig. 1 test macro pie graph of the present invention.
Fig. 2 test macro schematic diagram.
Fig. 3 radiation source vacuum chamber schematic diagram.
Embodiment
A kind of X-ray detection system performance testing of the present invention system, comprises radiation source vacuum chamber, product vacuum chamber to be measured, X ray transmission cavity, x-ray source, X ray spectrum calibration device, x-ray spectrometry device, X-ray attenuation device, vacuum extractor.As shown in Figure 1, test macro is made up of three vacuum section, radiation source vacuum chamber, Devices to test vacuum chamber and X ray transmission cavity.Use vacuum extractor to vacuumize three cavitys after system connectivity, vacuum tightness enters 10
-4after Pa, performance test can be carried out.
Detection system performance test is all carried out in vacuum environment, Fig. 1 and Fig. 2 sets forth system test layout and equipment design sketch.
Step one: the generation of X ray point source
As shown in Figure 3, in radiation source vacuum chamber, X-ray tube, as x-ray source, after x-ray spectrometry device, obtains the most close to the x-ray source of space X x radiation x feature.
Step 2: X ray spectrum calibration
The x-ray source that X-ray tube produces, as the detected object of detection system, needs to demarcate radiation, determines radiation purity (ratio of radiation amount shared by feature spectral coverage), demarcates radiation spectrum segment information.
(1) X-ray tube, X ray spectrum calibration device is connected to respective flange-interface;
(2) vacuumize radiation source vacuum chamber, vacuum tightness reaches 5 × 10
-4pa, uses vacuum meter to detect;
(3) check X-ray tube powering apparatus working condition, make it be loaded on operating voltage;
(4) check X-ray tube water cooling plant working condition, make it normally work;
(5) open test computer, carry out the setting of X ray spectrum calibration device by software;
(6) by software, X-ray detector is lowered the temperature, make it be operated in optimum signal-noise ratio state;
(7) open X-ray tube electric supply installation, make it produce x-ray source;
(8) by the time shutter of software design patterns X ray CCD, x-ray photon is received;
(9) on test computer, result of detection is shown.
Step 3: X-ray attenuation and quantitatively exporting
The X-radiation intensity produced by X-ray tube by X-ray attenuation device is reduced to close to single photon level, can test the detectivity of X-ray detector to space low dose X-ray.
The X-ray intensity of space radiation is in single photon level, radiation intensity order magnitude range 10
-4 ~ 1ph/s/cm
2, therefore need to use damped system to reduce X-radiation intensity.
According to the principle of work of X-ray tube, when using target for Mg or Al, respectively when 300W and 400W operating power, the x-ray photon number of generation is about 10
9-11ph/s, consider that the angle of divergence of X-ray tube outgoing is about 140 °, the photon number in 1mad is about 30000, need use the X-ray attenuation device with per mille damping capacity.
(1) at radiation source vacuum chamber gate center flange, X-ray tube is installed;
(2) in product vacuum chamber to be measured, X-ray detector is installed;
(3) at X ray transmission cavity and product vacuum chamber junction to be measured, DN50 diaphragm is installed;
(4) in radiation source vacuum chamber, along X ray transmission vertical direction, X-ray attenuation device is installed;
(5) close radiation source vacuum chamber and product vacuum chamber gate to be measured, carry out vacuum pumping, target vacuum is 5 × 10
-4pa;
(6) after reaching target vacuum, open X-ray tube working power, produce X ray;
(7) X ray operating power is selected to be 300W (Mg) or 400W (Al);
(8), after X ray steady operation 5min, start detection, avoid the instability of X-ray tube;
(9) detection time is t (unit s), and X-ray detector detects the x-ray photon that transmission comes, record result of detection.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (6)
1. an X-ray detection system performance testing system, is characterized in that: comprise radiation source vacuum chamber, product vacuum chamber to be measured, X ray transmission cavity, x-ray source, X ray spectrum calibration device, x-ray spectrometry device, X-ray attenuation device, vacuum extractor;
Described radiation source vacuum chamber is placed with test platform and the cold screen of decontamination, and test platform is placed with x-ray spectrometry device, and the cold screen of decontamination is for keeping working temperature; Radiation source vacuum chamber has electrical interface flange, vacuum-pumping pipeline flange, X ray transmission cavity interface, caliberating device interface; Radiation source vacuum chamber is connected with external power source by electrical interface flange, and radiation source vacuum chamber is connected with vacuum extractor by vacuum-pumping pipeline flange; Radiation source vacuum chamber is connected with X ray spectrum calibration device by caliberating device interface, carries out Real-Time Monitoring and demarcation when X ray spectrum calibration device is used for work to X ray spectral coverage;
Described product vacuum chamber to be measured is placed with test platform and the cold screen of decontamination, and test platform is placed with X-ray detector, and the cold screen of decontamination is for keeping working temperature; Radiation source vacuum chamber has electrical interface flange, vacuum-pumping pipeline flange, X ray transmission cavity interface; Radiation source vacuum chamber is connected with external power source by electrical interface flange, and radiation source vacuum chamber is connected with vacuum extractor by vacuum-pumping pipeline flange;
Described X ray transmission cavity comprises 6 main pipelines and 2 corrugated tubes regulate pipeline, and putting in order from left to right is followed successively by supervisor, supervisor, corrugated tube adjustment pipeline, supervisor, supervisor, corrugated tube adjustment pipeline, supervisor, supervisor; Supervisor's material is stainless steel, and inwall carries out polishing; One end of X ray transmission cavity is connected with radiation source vacuum chamber, and the other end is connected with product vacuum chamber to be measured;
Before test starts, process is vacuumized to radiation source vacuum chamber, product vacuum chamber to be measured, X ray transmission cavity; Test starts the x-ray source be placed in radiation source vacuum chamber and produces X ray, x-ray spectrometry device in radiation source vacuum chamber on test platform extracts X ray target spectral coverage, carry out realizing less parallel after long range propagation through X ray transmission cavity again, finally by the X-ray detector on test platform in product vacuum chamber to be measured, X ray is detected.
2. a kind of X-ray detection system performance testing system according to claim 1, is characterized in that: described X ray transmission cavity total length is 28m.
3. a kind of X-ray detection system performance testing system according to claim 1, is characterized in that: described x-ray source is double anode X-ray tube.
4. a kind of X-ray detection system performance testing system according to claim 1, is characterized in that: described X ray spectrum calibration device comprises x-ray spectrometer and X ray CCD.
5. a kind of X-ray detection system performance testing system according to claim 1, it is characterized in that: described x-ray spectrometry device chooses transmission-type X-ray grating, screen periods is 500nm, area 10 × 0.1mm
2, golden thickness 500nm, dutycycle 0.4 ~ 0.6, grid line shape is rectangle, useful area 70%.
6. a kind of X-ray detection system performance testing system according to claim 1, is characterized in that: described X-ray attenuation device is chosen at the laminated film that on Kapton, AM aluminum metallization film is formed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106768874A (en) * | 2016-11-18 | 2017-05-31 | 中国科学院西安光学精密机械研究所 | X-ray focusing optical focusing performance measuring device |
| CN110501362A (en) * | 2019-07-31 | 2019-11-26 | 中国科学院合肥物质科学研究院 | The transmitting device of X-ray under a kind of high-intensity magnetic field |
| CN113109374A (en) * | 2021-03-30 | 2021-07-13 | 中国科学院合肥物质科学研究院 | Long optical path energy dispersion X-ray diffraction device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768874A (en) * | 2016-11-18 | 2017-05-31 | 中国科学院西安光学精密机械研究所 | X-ray focusing optical focusing performance measuring device |
| CN110501362A (en) * | 2019-07-31 | 2019-11-26 | 中国科学院合肥物质科学研究院 | The transmitting device of X-ray under a kind of high-intensity magnetic field |
| CN113109374A (en) * | 2021-03-30 | 2021-07-13 | 中国科学院合肥物质科学研究院 | Long optical path energy dispersion X-ray diffraction device |
| CN113109374B (en) * | 2021-03-30 | 2022-08-26 | 中国科学院合肥物质科学研究院 | Long optical path energy dispersion X-ray diffraction device |
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Application publication date: 20150923 |