CN116068609B - Space position calibration method and device for flexural spectrometer in vacuum environment - Google Patents
Space position calibration method and device for flexural spectrometer in vacuum environment Download PDFInfo
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- CN116068609B CN116068609B CN202310220776.3A CN202310220776A CN116068609B CN 116068609 B CN116068609 B CN 116068609B CN 202310220776 A CN202310220776 A CN 202310220776A CN 116068609 B CN116068609 B CN 116068609B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
Abstract
The invention relates to the technical field of bent crystal spectrometers, and discloses a method and a device for calibrating the space position of a bent crystal spectrometer in a vacuum environment, wherein the method comprises the steps of pumping the vacuum degree of a vacuum chamber to 10 ‑5 Pa magnitude; at least five helium-neon laser tubes with adjustable space positions are preset in the detector chamber; acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes, and controlling the opening of the at least five helium-neon laser tubes so as to enable laser beams of the at least five helium-neon laser tubes to be imaged after passing through spherical curved crystals; acquiring three-dimensional coordinates of an imaging point of the laser beam; and obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the flexural spectrometer in a vacuum environment. The invention can finish the accurate space position calibration of the bent crystal spectrometer in the vacuum environment and can solve the problem of in-situ space position calibration.
Description
Technical Field
The invention relates to the technical field of bent crystal spectrometers, in particular to a method and a device for calibrating the space position of a bent crystal spectrometer in a vacuum environment.
Background
An X-ray spherical bending crystal spectrometer (bent crystal spectrometer) is one of the main diagnoses for measuring plasma ion temperature profile and rotational velocity profile on tokamak nuclear fusion Experimental Apparatus (EAST). The measurement principle is mainly based on Doppler broadening and translation of the identification spectrum line. For profile measurements of ion temperature and rotational speed, accurate spatial position calibration is extremely important.
Currently, the method for calibrating the spatial position of a flexural spectrometer worldwide is mainly carried out under the atmospheric environment (1 atm). The method comprises the following specific steps: under the atmospheric environment, the laser is used for corresponding the space position on the detector and the position inside the tokamak one by one, so that the fitting relation between the position of the detector and the position inside the tokamak is obtained, and the space position calibration of the flexural crystal spectrometer under the atmospheric environment is completed. Then, the spatial position calibration relationship between the atmospheric environment and the vacuum environment is assumed to be the same, so that the spatial position calibration of the flexural crystal spectrometer in the vacuum environment is completed.
However, since the spatial position calibration method assumes that the spatial position calibration relationship in the atmospheric environment is the same as that in the vacuum environment, it is not possible to determine whether the spatial position calibration relationship in the atmospheric environment is the same as that in the vacuum environment or not and how much difference exists in the current experiment, so that errors exist in the spatial position calibration method and the result. For example, after the space position calibration is completed in the atmospheric environment, the diagnosis of the tokamak device and the flexural spectrometer is to be vacuumized to 10 < -5 > Pa and 10 < -3 > Pa >, and the large radius of the outer vacuum chamber of the tokamak device is shortened by about 1cm in the vacuumization process; meanwhile, the bent crystal spectrometer diagnosis can also move along with the Tokamak device, and at the moment, the space position calibration relation between the atmospheric environment and the vacuum environment is determined to have a gap.
In summary, the existing calibration method for the spatial position of the bent spectrometer has errors in the calibration relationship between the spatial position in the atmospheric environment and the spatial position in the vacuum environment, so that the calibration accuracy of the spatial position of the bent spectrometer in the vacuum environment is not high.
Disclosure of Invention
The invention provides a method and a device for calibrating the space position of a bent crystal spectrometer in a vacuum environment, which are used for solving the technical problem that the precision of the space position calibration of the bent crystal spectrometer in the vacuum environment is low due to the fact that errors exist in the space position calibration relation between the existing space position calibration method of the bent crystal spectrometer in the atmospheric environment and the vacuum environment.
In order to solve the above technical problems, the present invention provides a method for calibrating a spatial position of a flexural spectrometer in a vacuum environment, including:
pumping the vacuum degree of the vacuum chamber to 10 -5 Pa magnitude; at least five helium-neon laser tubes with adjustable space positions are preset in the detector chamber;
acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes, and controlling the opening of the at least five helium-neon laser tubes so as to enable laser beams of the at least five helium-neon laser tubes to be imaged after passing through spherical curved crystals;
acquiring three-dimensional coordinates of an imaging point of the laser beam;
and obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the flexural spectrometer in a vacuum environment.
Preferably, the linear relationship comprises:
y’= -3.47y-0.14
where y' represents the imaging point three-dimensional coordinates and y represents the initial three-dimensional coordinates.
Preferably, at least five helium-neon laser tubes are vertically aligned in the vacuum chamber in a manner perpendicular to the detector plane.
Preferably, the helium-neon laser tube is provided with five initial three-dimensional coordinates of y1 (0 mm,0mm, 60 mm), y2 (0 mm,0mm, 30 mm), y3 (0 mm,0mm, 0 mm), y4 (0 mm,0mm, -30 mm), y5 (0 mm,0mm, -60 mm), respectively.
Preferably, the vertical coordinates of the imaging points of the five laser beams are respectively-210 mm, -102mm, 0mm, +104mm and +207mm.
Preferably, after obtaining the linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to the unitary linear regression analysis to complete the calibration of the spatial position of the flexural spectrometer in the vacuum environment, the method further comprises:
obtaining a linear fitting relation between the detector position and the EAST vacuum chamber position according to the linear relation;
and (3) corresponding the detector position coordinates in the linear fitting relation to the pixel values of the detector so as to perform experiments.
In a second aspect, the present invention provides a device for calibrating a spatial position of a bending spectrometer in a vacuum environment, including:
the vacuum chamber is communicated with a detector chamber, a spherical bending crystal is arranged in the vacuum chamber, and at least five helium-neon laser tubes with adjustable space positions are arranged in the detector chamber;
the position calibration module comprises a laser tracker and a linear regression analysis module; the laser tracker is used for acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes and three-dimensional coordinates of imaging points of the laser beams; the linear regression analysis module is used for obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the bent spectrometer in a vacuum environment.
Preferably, at least five helium-neon laser tubes are vertically aligned in the vacuum chamber in a manner perpendicular to the detector plane.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for calibrating the space position of a bent spectrometer in a vacuum environment, which comprises the following steps: pumping the vacuum degree of the vacuum chamber to the order of 10-5 Pa; at least five helium-neon laser tubes with adjustable space positions are preset in the detector chamber; acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes, and controlling the opening of the at least five helium-neon laser tubes so as to enable laser beams of the at least five helium-neon laser tubes to be imaged after passing through spherical curved crystals; acquiring three-dimensional coordinates of an imaging point of the laser beam; and obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the flexural spectrometer in a vacuum environment. The invention can finish the accurate space position calibration of the bent crystal spectrometer in the vacuum environment, and can solve the problem of in-situ space position calibration; meanwhile, the ion temperature and the rotation speed profile are measured more accurately.
Drawings
FIG. 1 is a schematic diagram of a spatial position calibration device of a bent spectrometer in a vacuum environment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a local enlarged structure of a calibration device for a space position of a bent spectrometer in a vacuum environment according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a calibration method for the spatial position of a bent spectrometer in a vacuum environment according to an embodiment of the present invention;
wherein, the reference numerals are as follows: 1. a vacuum chamber; 2. a detector chamber; 3. a spherically curved crystal; 4. helium neon laser tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides a calibration device for a spatial position of a bending spectrometer in a vacuum environment, including:
the vacuum chamber is communicated with a detector chamber, a spherical bending crystal is arranged in the vacuum chamber, and at least five helium-neon laser tubes with adjustable space positions are arranged in the detector chamber;
the position calibration module comprises a laser tracker and a linear regression analysis module; the laser tracker is used for acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes and three-dimensional coordinates of imaging points of the laser beams; the linear regression analysis module is used for obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the bent spectrometer in a vacuum environment.
The helium-neon laser tube is a vacuum adaptive laser tube, and the position of the helium-neon laser tube is precisely fixed. Illustratively, they are arranged vertically in a manner perpendicular to the plane of the PILATUS900K detector with coordinates of y1 (0 mm,0mm, 60 mm), y2 (0 mm,0mm, 30 mm), y3 (0 mm ), y4 (0 mm,0mm, -30 mm), y5 (0 mm,0mm, -60 mm) in that order; wherein the coordinates of y1, y2, y3, y4, y5 are determined by means of a vacuum-adapted laser tracker.
Fig. 1 is a polar cross-sectional view of the vacuum chamber in EAST, and the dashed line AB is an axial symmetry line in the vertical direction. The spherical curved crystal is a spectroscopic and focusing element, and is typically a spherical curved crystal such as Quartz (110), quartz (102), or Ge (113). The detector chamber is used to mount a pilates 900K detector.
Referring to fig. 3, an embodiment of the invention provides a method for calibrating a space position of a bent spectrometer in a vacuum environment, which comprises the following steps:
s11, pumping the vacuum degree of the vacuum chamber to 10 -5 Pa magnitude; at least five helium-neon laser tubes with adjustable space positions are preset in the detector chamber;
s12, acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes, and controlling the at least five helium-neon laser tubes to be opened so as to enable laser beams of the at least five helium-neon laser tubes to be imaged after passing through spherical curved crystals;
s13, acquiring three-dimensional coordinates of an imaging point of the laser beam;
s14, obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the flexural spectrometer in a vacuum environment.
Wherein at least five helium-neon laser tubes are vertically aligned in the vacuum chamber in a manner perpendicular to the detector plane.
To facilitate an understanding of the present invention, five helium-neon laser tubes are described further below as examples.
In this embodiment, five of the helium-neon laser tubes are provided, and initial three-dimensional coordinates of the five helium-neon laser tubes are y1 (0 mm,0mm, 60 mm), y2 (0 mm,0mm, 30 mm), y3 (0 mm,0mm, 0 mm), y4 (0 mm,0mm, -30 mm), and y5 (0 mm,0mm, -60 mm), respectively. The three-dimensional coordinates of the imaging points of the five laser beams are respectively-210 mm, -102mm, 0mm, +104mm and +207mm in vertical direction.
Further, the linear relationship includes:
y’= -3.47y-0.14
where y' represents the imaging point three-dimensional coordinates and y represents the initial three-dimensional coordinates.
Preferably, after obtaining the linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to the unitary linear regression analysis to complete the calibration of the spatial position of the flexural spectrometer in the vacuum environment, the method further comprises:
obtaining a linear fitting relation between the detector position and the EAST vacuum chamber position according to the linear relation;
and (3) corresponding the detector position coordinates in the linear fitting relation to the pixel values of the detector so as to perform experiments.
It should be noted that the invention is used for realizing the accurate spatial position calibration of the bent spectrometer in the vacuum environment. Under a vacuum environment, the laser is used for corresponding the space position on the detector and the position inside the tokamak one by one, so that the fitting relation between the position of the detector and the position inside the tokamak is obtained, and the space position calibration of the bent crystal spectrometer under the atmospheric environment is completed. Wherein the linear fit relationship with respect to the detector position and the EAST vacuum chamber position is the same as the linear relationship with respect to the initial three-dimensional coordinates and the imaging point three-dimensional coordinates. After calibration by a helium-neon laser tube, the calibration relation between the detector position y and the EAST vacuum chamber position y' is equivalent to that of the detector, and the experiment can be performed by using the detector.
In the implementation, the accurate spatial position calibration steps of the flexural crystal spectrometer in a vacuum environment are as follows:
the first step: vacuum-adapted helium-neon laser tubes (1), (2), (3), (4) and (5) with adjustable spatial positions are precisely arranged in a vacuum chamber and vertically arranged in a mode of being perpendicular to the middle plane of a PILATUS900K detector, and the coordinates of the vacuum-adapted helium-neon laser tubes are as follows in sequence: y1 (0 mm,0mm, 60 mm), y2 (0 mm,0mm, 30 mm), y3 (0 mm,0mm, 0 mm), y4 (0 mm,0mm, -30 mm), y5 (0 mm,0mm, -60 mm);
and a second step of: evacuating the whole system to 10 -5 Pa, the whole system comprising: diagnosing by a bent crystal spectrometer, 5 sets of helium-neon laser tubes, spherical bent crystals and EAST devices;
and a third step of: starting five sets of vacuum-adapted helium-neon laser tubes, forming images on y1', y2', y3', y4', y5 'after 5 laser beams pass through spherical curved crystals, and finally accurately measuring three-dimensional coordinates of the 5 points y1', y2', y3', y4', y5' by using a vacuum-adapted laser tracker, wherein the three-dimensional coordinates are as follows: y1' (-, -, -210 mm), y2' (-, -102 mm), y3' (-, -0 mm), y4' (-, +104 mm), y5' (-, +207 mm);
fourth step: and (3) obtaining linear relations between y1', y2', y3', y4', y5' and y1, y2, y3, y4 and y5 by using unitary linear regression analysis, namely completing the space position calibration of the flexural spectrometer in a vacuum environment.
It should be noted that, the calibration of the spatial position of the flexural spectrometer in the vacuum environment only needs to consider the spatial position calibration relation in the z direction (vertical direction). Position data under the following vacuum conditions were obtained at this time:
according to the detector position y and the EAST vacuum chamber position y ', linear fitting relation y ' = -3.47y-0.14 can be obtained by applying unitary linear regression analysis, so that calibration relation of the detector position y and the EAST vacuum chamber position y ' is completed, namely, space position calibration of the crystal bending spectrometer in a vacuum environment is completed.
After the space position calibration of the bent spectrometer under the vacuum environment is completed, the position coordinate y of the detector in the linear relation is corresponding to the pixel value (the size of each pixel is 0.172mm multiplied by 0.172 mm) of the PILATUS900K detector, and the bent spectrometer can be applied to experiments.
Compared with the prior art, the invention has the advantages that: (1) The accurate space position calibration of the bent crystal spectrometer can be completed in a vacuum environment, the difficulty of in-situ space position calibration can be solved, and the accuracy of the space position calibration of the bent crystal spectrometer in the vacuum environment is improved to be within 2 mm; (2) The measurement of ion temperature and rotational velocity profile is more accurate.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The method for calibrating the space position of the bent spectrometer in the vacuum environment is characterized by comprising the following steps of:
pumping the vacuum degree of the vacuum chamber to 10 -5 Pa magnitude; at least five helium-neon laser tubes with adjustable space positions are preset in the detector chamber;
acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes, and controlling the opening of the at least five helium-neon laser tubes so as to enable laser beams of the at least five helium-neon laser tubes to be imaged after passing through spherical curved crystals;
acquiring three-dimensional coordinates of an imaging point of the laser beam;
and obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the flexural spectrometer in a vacuum environment.
2. The method for calibrating the spatial position of a bent spectrometer under a vacuum environment according to claim 1, wherein the linear relation comprises:
y’= -3.47y-0.14
where y' represents the imaging point three-dimensional coordinates and y represents the initial three-dimensional coordinates.
3. The method of calibrating a spatial position of a flexural spectrometer under vacuum environment of claim 1 in which at least five helium-neon laser tubes are vertically aligned in the vacuum chamber in a manner perpendicular to a detector plane.
4. The method for calibrating the spatial position of the bent spectrometer under the vacuum environment according to claim 2, wherein five helium-neon laser tubes are arranged, and initial three-dimensional coordinates of the five helium-neon laser tubes are y1 (0 mm,0mm, 60 mm), y2 (0 mm,0mm, 30 mm), y3 (0 mm,0mm, 0 mm), y4 (0 mm,0mm, -30 mm) and y5 (0 mm,0mm, -60 mm) respectively.
5. The method for calibrating the spatial position of a bent spectrometer under a vacuum environment according to claim 4, wherein the vertical coordinates of the imaging points of the five laser beams are respectively-210 mm, -102mm, 0mm, +104mm and +207mm.
6. The method for calibrating the spatial position of a bent spectrometer under a vacuum environment according to claim 1, wherein after obtaining the linear relation between the initial three-dimensional coordinates and the three-dimensional coordinates of the imaging points according to unitary linear regression analysis to complete the calibration of the spatial position of the bent spectrometer under the vacuum environment, the method further comprises:
obtaining a linear fitting relation between the detector position and the EAST vacuum chamber position according to the linear relation;
and (3) corresponding the detector position coordinates in the linear fitting relation to the pixel values of the detector so as to perform experiments.
7. The utility model provides a bent crystal spectrometer spatial position calibration device under vacuum environment which characterized in that includes:
the vacuum chamber is communicated with a detector chamber, a spherical bending crystal is arranged in the vacuum chamber, and at least five helium-neon laser tubes with adjustable space positions are arranged in the detector chamber;
the position calibration module comprises a laser tracker and a linear regression analysis module; the laser tracker is used for acquiring initial three-dimensional coordinates of at least five helium-neon laser tubes and three-dimensional coordinates of imaging points of laser beams; the linear regression analysis module is used for obtaining a linear relation between the initial three-dimensional coordinate and the three-dimensional coordinate of the imaging point according to unitary linear regression analysis so as to complete the space position calibration of the bent spectrometer in a vacuum environment.
8. The vacuum environment flexural spectrometer spatial position calibration device of claim 7 in which at least five helium-neon laser tubes are vertically aligned in the vacuum chamber in a manner perpendicular to the detector plane.
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