CN105352514A - Aligning correction device and method for space navigation detector ground calibration - Google Patents
Aligning correction device and method for space navigation detector ground calibration Download PDFInfo
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- CN105352514A CN105352514A CN201510757854.9A CN201510757854A CN105352514A CN 105352514 A CN105352514 A CN 105352514A CN 201510757854 A CN201510757854 A CN 201510757854A CN 105352514 A CN105352514 A CN 105352514A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/24—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for cosmonautical navigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
Abstract
The invention discloses an aligning correction device and method for space navigation detector ground calibration. Accuracy aligning of an X radiation source and a detector can be achieved through the device, and the parallel aligning error is less than 0.02 degree and the central aligning error is less than 1mm. The device comprises a front-vehicle optical measuring platform and a rear-vehicle optical measuring platform. A detector is fixedly installed on the front-vehicle optical measuring platform. An X radiation source is fixedly installed on the rear-vehicle optical measuring platform. The front-vehicle and rear-vehicle optical measuring platforms are located at front and rear ends of a vacuum beam line channel respectively. Firstly, parallelism aligning is carried out, the posture of the front-vehicle or rear-vehicle optical measuring platform is adjusted, and thus an image of a laser light spot is located at an imaging center of a parallelism measuring CCD camera; then height and horizontal displacement aligning is carried out, the posture of the front-vehicle or rear-vehicle optical measuring platform is adjusted, thus the image of the laser light spot is located at the imaging center of the displacement measuring CCD camera, and finally aligning of the X radiation source and the detector is achieved.
Description
Technical field
The present invention relates to space probe technical field, be specifically related to aligning deviation correcting device and the method for the demarcation of a kind of space navigation seeker ground.
Background technology
Space navigation detector generally all needs first to complete demarcation on ground, but domestic also not for space navigation detector does the specialized agency and test unit of demarcating at present, is still in the exploratory stage.
513 rely on general assembly two generation to navigate key special subjects problem " pulsar navigation ground test system ", development completes largest domestic, function is the most complete, posture adjustment precision is the highest large-scale vacuum testing equipment---vacuum bunch passage.Vacuum bunch outside diameter of passage reaches 2.1 meters, total length 17 meters, for the ground high precision alignment correction realizing detector provides vacuum working environment.
Current detector and laser alignment method or device calibration accuracy lower, be not suitable for the calibration correction of space navigation detector.
Summary of the invention
In view of this, the invention provides the aligning deviation correcting device that a kind of space navigation seeker ground is demarcated, the accurate aligning between x-ray source and detector can be realized, realize that parallel alignment error is less than 0.02 °, center alignment error is less than 1mm, be particularly suitable for the demarcation of the space navigation detector that field range is little, alignment precision is high.
The aligning deviation correcting device that space navigation seeker ground of the present invention is demarcated, comprising: front truck optical measurement platform and rear car optical measurement platform, peripherals is x-ray source, detector and vacuum bunch passage;
Wherein, forward and backward car optical measurement platform lays respectively at the forward and backward two ends of vacuum bunch passage, and detector is fixedly mounted on front truck optical measurement platform, and x-ray source is fixedly mounted on rear car optical measurement platform; Forward and backward car optical measurement platform is all provided with servo control mechanism;
Wherein, front truck optical measurement platform is also installed with following surveying instrument: displacement measurement CCD camera, the first half-reflection and half-transmission level crossing and the first imaging screen frosted glass plate; Wherein, the imaging plane of displacement measurement CCD camera and the imaging plane of detector are positioned at same plane, and central point is equal relative to the height of measuring table; First imaging screen frosted glass plate is positioned on the focal plane of displacement measurement CCD camera; First half-reflection and half-transmission level crossing and displacement measurement CCD camera lay respectively at the both sides of the first imaging screen frosted glass plate; First half-reflection and half-transmission level crossing minute surface is parallel with the first imaging screen frosted glass plate minute surface;
Rear car optical measurement platform is also installed with following surveying instrument: laser instrument, the second half-reflection and half-transmission level crossing, the second imaging screen frosted glass plate and measurement of paralleism CCD camera; Wherein, the exit facet of laser instrument and the exit facet of x-ray source are positioned at same plane, and central point is equal relative to the height of measuring table; Distance between laser instrument with x-ray source is equal with the distance between detector with displacement measurement CCD camera; Second half-reflection and half-transmission level crossing is positioned in the light path of laser instrument, and angle at 45 ° with the light path of laser instrument; Measurement of paralleism CCD camera is positioned at laser and is radiated on the reverse extending line of the primary event light on the second half-reflection and half-transmission level crossing; Second imaging screen frosted glass plate is positioned on the focal plane of measurement of paralleism CCD camera.
Further, front truck optical measurement platform is also installed with the first auxiliary lamp, first auxiliary lamp, between displacement measurement CCD camera and the first imaging screen frosted glass plate, avoids the imaging optical path of displacement measurement CCD camera, is radiated on the first imaging screen frosted glass plate; Rear car optical measurement platform is also installed with the second auxiliary lamp, second auxiliary lamp is between measurement of paralleism CCD camera and the second imaging screen frosted glass plate, avoid the imaging optical path of measurement of paralleism CCD camera, be radiated on the second imaging screen frosted glass plate.
The aligning method for correcting error that space navigation seeker ground of the present invention is demarcated, comprises the steps:
Step 1, opens the hatch door of vacuum bunch passage, opens laser instrument, measurement of paralleism CCD camera and displacement measurement CCD camera; The laser beam that laser instrument is launched arrives the first half-reflection and half-transmission level crossing through the second half-reflection and half-transmission level crossing, wherein, the intersection point of laser beam and the second half-reflection and half-transmission level crossing is defined as B point, the intersection point of laser beam and the first half-reflection and half-transmission level crossing is defined as C point, on a part of Transmission light to the first imaging screen frosted glass plate of C point, to be taken pictures imaging by displacement measurement CCD camera, another part reflexes on the second half-reflection and half-transmission level crossing, and through the second half-reflection and half-transmission flat mirror reflects on the second imaging screen frosted glass plate, to be taken pictures imaging by measurement of paralleism CCD camera; Wherein, the intersection point of laser reflection light and the second half-reflection and half-transmission level crossing is defined as D point, the intersection point of laser reflection light and the second imaging screen frosted glass plate is defined as E point;
Step 2, coarse adjustment:
Step 2.1, is adjusted displacement and the attitude of front truck optical measurement platform or rear car optical measurement platform, the luminous point D on the second half-reflection and half-transmission level crossing is estimated with luminous point B and overlaps by servo control mechanism;
Step 2.2, carry out depth of parallelism correction: observe the imaging center whether imaging of E point in measurement of paralleism CCD camera is positioned at measurement of paralleism CCD camera, if, then the depth of parallelism is aimed at, and proceeds to step 2.3, otherwise, by servo control mechanism adjustment front truck or rear car optical measurement platform, make the imaging of E point in measurement of paralleism CCD camera be positioned at the imaging center of measurement of paralleism CCD camera, complete the depth of parallelism and correct, proceed to step 2.3;
Step 2.3, carry out height and horizontal shift correction: whether the imaging of hot spot in displacement measurement CCD camera observed on the first imaging screen frosted glass plate is positioned at the imaging center of displacement measurement CCD camera, if, then height and horizontal shift are aimed at, proceed to step 3, otherwise, by servo control mechanism adjustment front truck or rear car optical measurement platform, the imaging of hot spot in displacement measurement CCD camera on the first imaging screen frosted glass plate is made to be positioned at the imaging center of displacement measurement CCD camera, complete height and horizontal shift aligning, proceed to step 3;
Step 3, close the hatch door of vacuum bunch passage, vacuumize, after the vacuum tightness of vacuum bunch passage reaches vacuum level requirements, first carry out depth of parallelism correction, the laser facula that measurement of paralleism CCD camera is taken is positioned at its imaging center; Then carry out height and horizontal shift correction, the laser facula that displacement measurement CCD camera is taken is positioned at its imaging center, completes aiming between detector with x-ray source.
Beneficial effect:
(1) this device can realize the accurate aligning of detector and x-ray source, and depth of parallelism alignment error is less than 0.02 °, height alignment error is less than 1mm, and demand demarcated by meeting spatial navigation detector;
(2) this device flexible operation, even if detector and x-ray source occur deviation because of change in location, also can correct by automatic or manual;
(3) this device can also provide visual field alignment function accurately for the demarcation of focus type detector, astronomical sight Satellite Payloads.
Accompanying drawing explanation
Fig. 1 is the optical schematic diagram that the present invention aims at deviation correcting device.
Fig. 2 is that the depth of parallelism aims at correction schematic diagram.
Fig. 3 is that correction schematic diagram is aimed in height and horizontal shift.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The invention provides the aligning deviation correcting device that a kind of space navigation seeker ground is demarcated, as shown in Figure 1, comprise front truck optical measurement platform and rear car optical measurement platform, wherein, detector is fixedly mounted on front truck optical measurement platform, x-ray source is fixedly mounted on rear car optical measurement platform, forward and backward car optical measurement platform lays respectively at the forward and backward two ends of vacuum bunch passage, displacement, attitude servo control mechanism measuring table be equipped with, the horizontal translation of measuring table, lift in height can be realized, and can realize along its 3 dimension coordinate axle all rotatable.Forward and backward car optical measurement platform is structured in respective rigid base respectively, and these two rigid base form be rigidly connected with the benchmark flat board of forward and backward car (not only the installation of detector and x-ray source is dull and stereotyped) respectively.Therefore, the change of the relative position of forward and backward car benchmark flat board, just can through with their rigidly connected forward and backward car optical measurement platforms on observe out, and then reflect the alignment case of detector and x-ray source.
Wherein, front truck optical measurement platform fixedly mounts following surveying instrument: displacement measurement CCD camera, first half-reflection and half-transmission level crossing 60mm × 60mm × 2mm, the first imaging screen frosted glass plate 60mm × 60mm × 2mm and the first auxiliary lamp.Wherein, at grade, and central point is equal relative to the height of front truck optical measurement platform for the imaging plane of displacement measurement CCD camera and the imaging plane of detector.First imaging screen frosted glass plate be centrally located in the one-tenth image focus of displacement measurement CCD camera, the central axis of minute surface and displacement measurement CCD camera is perpendicular.First half-reflection and half-transmission level crossing and displacement measurement CCD camera lay respectively at the both sides of the first imaging screen frosted glass plate; First half-reflection and half-transmission level crossing minute surface is parallel with the first imaging screen frosted glass plate minute surface, and two minute surface centre-heights are equal; First half-reflection and half-transmission level crossing can be attached on the first imaging screen frosted glass plate, adopts frosted glass plate can make the brightness uniformity of laser facula, avoids the measuring error that spot intensity inequality is brought.First auxiliary lamp is between displacement measurement CCD camera and the first imaging screen frosted glass plate, avoid the imaging optical path of displacement measurement CCD camera, be radiated on the first imaging screen frosted glass plate, for providing fill-in light, avoid light to cross and secretly shining into displacement measurement CCD camera image blur.
Rear car optical measurement platform fixedly mounts following surveying instrument: high precision laser (emergent light diameter 20mm), second half-reflection and half-transmission level crossing 100mm × 100mm × 2mm, second imaging screen frosted glass plate 110mm × 100mm × 2mm, measurement of paralleism CCD camera and the second auxiliary lamp.Wherein, the exit facet of high precision laser and the exit facet of x-ray source are at grade, and central point is equal relative to the height of rear car optical measurement platform, and, distance between high precision laser with x-ray source is equal with the distance between detector with displacement measurement CCD camera, therefore, alignment case between x-ray source and detector is equal to the alignment case between high precision laser and displacement measurement CCD camera, can by regulating high precision laser and aiming between displacement measurement CCD camera, realize aiming at of x-ray source and detector.
Wherein, select high precision laser can realize laser facula little as much as possible, reduce because hot spot spreads the systematic error brought.
Wherein, the second half-reflection and half-transmission level crossing is positioned in the light path of high precision laser, and angle at 45 ° with the light path of high precision laser; Measurement of paralleism CCD camera is positioned at high precision laser laser and is radiated on the reverse extending line of the primary event light on the second half-reflection and half-transmission level crossing; Second imaging screen frosted glass plate is between the second half-reflection and half-transmission level crossing and measurement of paralleism CCD camera, and in the focus being centrally located at measurement of paralleism CCD camera of the second imaging screen frosted glass plate, the central axis of minute surface and measurement of paralleism CCD camera is perpendicular.Second auxiliary lamp is between measurement of paralleism CCD camera and the second imaging screen frosted glass plate, avoid the imaging optical path of measurement of paralleism CCD camera, be radiated on the second imaging screen frosted glass plate, for providing fill-in light, avoid light to cross and secretly shining into measurement of paralleism CCD camera image blur.
Optical measurement principle is as follows: if x-ray source and detector are in alignment, then the light path of aligning deviation correcting device of the present invention as shown in Figure 1, high precision laser Emission Lasers bundle penetrates from A point, through the C point of the B point arrival first half-reflection and half-transmission level crossing of the second half-reflection and half-transmission level crossing, on a part of Transmission light to the first imaging screen frosted glass plate of C point, to be taken pictures imaging by displacement measurement CCD camera, another part reflexes to the D point of the second half-reflection and half-transmission level crossing (now, B point and D point overlap), and through the E point of the second half-reflection and half-transmission flat mirror reflects to the second imaging screen frosted glass plate, to be taken pictures imaging by measurement of paralleism CCD camera.Now, height between high precision laser and displacement measurement CCD camera, horizontal shift alignment case (height namely between x-ray source and detector, horizontal shift alignment case) are taken by displacement measurement CCD camera, and the hot spot on the first imaging screen frosted glass plate is positioned at the imaging center of displacement measurement CCD camera; Depth of parallelism alignment case (depth of parallelism alignment case namely between x-ray source and detector) between high precision laser and displacement measurement CCD camera is taken by measurement of paralleism CCD camera, and the hot spot E point on the second imaging screen frosted glass plate is positioned at the imaging center of measurement of paralleism CCD camera.The hot spot of two CCD camera shootings, through spot center real time implementation process and Image binarizing algorithm process, imaging on the computer screen.
If there is deviation between x-ray source and detector, then carry out aligning correction to it, process is as follows:
1) depth of parallelism aims at correction process:
As shown in Figure 2, if only there is parallel misalignment between x-ray source and detector, then the laser beam that sends of high precision laser is after A point, B point arrive C point, through the D point place of the first half-reflection and half-transmission flat mirror reflects to the second half-reflection and half-transmission level crossing (now, D point and B point do not overlap), again through the E point of the second half-reflection and half-transmission flat mirror reflects to the second imaging screen frosted glass plate, taken pictures by measurement of paralleism CCD camera and be sent on computing machine.Owing to there is parallel misalignment between x-ray source and detector, E point imaging meeting parallel deviate degree measures the imaging center of CCD camera, as shown in the figure (d) in Fig. 2, the hot spot that measurement of paralleism CCD camera collects can depart from its imaging cross curve center.Now, in forward and backward car optical measurement platform, one of them maintenance is motionless, adjusts another attitude, makes E point be positioned at the cross curve center of measurement of paralleism CCD camera imaging.Consider that detector volume, weight are larger, front truck optical measurement platform can be made to keep motionless, adjustment rear car optical measurement platform, makes it along vertical axis revolving until the cross curve center of measurement of paralleism CCD camera imaging is got back in the imaging of E point, completes the depth of parallelism and aim at correction.
2) highly, correction process is aimed in horizontal shift:
As shown in Figure 3, if only there is height and horizontal shift deviation between x-ray source and detector, then the laser beam that sends of high precision laser is after A point, B point arrive C point, be transmitted through on the first imaging screen frosted glass plate through the first half-reflection and half-transmission level crossing, taken pictures by displacement measurement CCD camera and be sent to computing machine.When x-ray source and detector height and horizontal shift misalignment, hot spot meeting Departure displacement on first imaging screen frosted glass plate measures the imaging center of CCD camera, as shown in the figure (e) in Fig. 3, the hot spot that displacement measurement CCD camera collects can depart from its imaging cross curve center.Now, in forward and backward car optical measurement platform, one of them maintenance is motionless, adjusts another height and horizontal shift, makes the hot spot on the first imaging screen frosted glass plate be positioned at the imaging center of displacement measurement CCD camera.Such as, rear car optical measurement platform can be made to keep motionless, adjustment front truck optical measurement platform, makes it move up and down along Z-axis or level moves left and right until cross curve center is got back in imaging, completes height alignment correction.
3) height and the correction of horizontal shift, depth of parallelism composition error
Generally, there is parallelism error and height and horizontal shift error between x-ray source and detector simultaneously, consider that opposing parallel degree between forward and backward car optical measurement platform and relative translation motion all can cause the movement of hot spot in displacement measurement CCD camera, therefore, first parallel misalignment correction is carried out, have modified in the uneven situation between forward and backward car optical measurement platform, in the imaging of displacement measurement CCD camera the position relative to groove center of hot spot just directly reflection be the pure height of front and back car optical measurement platform and the deviation of horizontal shift.And then corrected altitude and horizontal shift deviation, x-ray source is aimed at detector.
Carry out concrete x-ray source to aim at seeker ground rectify a deviation operate time, can carry out in accordance with the following steps:
Step one, open the hatch door of vacuum bunch passage, detector will be installed, before the front truck optical measurement platform of x-ray source and each surveying instrument and rear car optical measurement platform are positioned over vacuum bunch passage respectively, rear two ends, adjustment front truck optical measurement platform and rear car optical measurement platform, the laser beam that high precision laser is sent to be estimated with luminous point B through luminous point D on the second half-reflection and half-transmission level crossing of the reflected light of C point and is overlapped, complete detector, the coarse adjustment of the depth of parallelism between x-ray source, then adjustment front truck or rear car optical measurement platform is continued, the hot spot E point on the second imaging screen frosted glass plate is made to be positioned at the imaging center of measurement of paralleism CCD camera, then adjustment front truck or rear car optical measurement platform is continued, the hot spot on the first imaging screen frosted glass plate is made to be positioned at the imaging center of displacement measurement CCD camera.
Step 2, close the hatch door of vacuum bunch passage, vacuumize, after vacuum bunch passage reaches vacuum level requirements, observe its laser facula taken separately by measurement of paralleism CCD camera and displacement measurement CCD camera and whether be positioned at its imaging center, if laser facula departs from its imaging center, then adjust front truck or rear car optical measurement platform, by the mode of first carrying out parallel misalignment correction, laggard line height and horizontal shift drift correction, complete the aligning of detector, x-ray source.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. an aligning deviation correcting device for space navigation seeker ground demarcation, it is characterized in that, comprising: front truck optical measurement platform and rear car optical measurement platform, peripherals is x-ray source, detector and vacuum bunch passage;
Wherein, forward and backward car optical measurement platform lays respectively at the forward and backward two ends of vacuum bunch passage, and detector is fixedly mounted on front truck optical measurement platform, and x-ray source is fixedly mounted on rear car optical measurement platform; Forward and backward car optical measurement platform is all provided with servo control mechanism;
Wherein, front truck optical measurement platform is also installed with following surveying instrument: displacement measurement CCD camera, the first half-reflection and half-transmission level crossing and the first imaging screen frosted glass plate; Wherein, the imaging plane of displacement measurement CCD camera and the imaging plane of detector are positioned at same plane, and central point is equal relative to the height of measuring table; First imaging screen frosted glass plate is positioned on the focal plane of displacement measurement CCD camera; First half-reflection and half-transmission level crossing and displacement measurement CCD camera lay respectively at the both sides of the first imaging screen frosted glass plate; First half-reflection and half-transmission level crossing minute surface is parallel with the first imaging screen frosted glass plate minute surface;
Rear car optical measurement platform is also installed with following surveying instrument: laser instrument, the second half-reflection and half-transmission level crossing, the second imaging screen frosted glass plate and measurement of paralleism CCD camera; Wherein, the exit facet of laser instrument and the exit facet of x-ray source are positioned at same plane, and central point is equal relative to the height of measuring table; Distance between laser instrument with x-ray source is equal with the distance between detector with displacement measurement CCD camera; Second half-reflection and half-transmission level crossing is positioned in the light path of laser instrument, and angle at 45 ° with the light path of laser instrument; Measurement of paralleism CCD camera is positioned at laser and is radiated on the reverse extending line of the primary event light on the second half-reflection and half-transmission level crossing; Second imaging screen frosted glass plate is positioned on the focal plane of measurement of paralleism CCD camera.
2. the aligning deviation correcting device of space navigation seeker ground demarcation as claimed in claim 1, it is characterized in that, front truck optical measurement platform is also installed with the first auxiliary lamp, first auxiliary lamp is between displacement measurement CCD camera and the first imaging screen frosted glass plate, avoid the imaging optical path of displacement measurement CCD camera, be radiated on the first imaging screen frosted glass plate; Rear car optical measurement platform is also installed with the second auxiliary lamp, second auxiliary lamp is between measurement of paralleism CCD camera and the second imaging screen frosted glass plate, avoid the imaging optical path of measurement of paralleism CCD camera, be radiated on the second imaging screen frosted glass plate.
3. an aligning method for correcting error for the aligning deviation correcting device adopting space navigation seeker ground as claimed in claim 1 or 2 to demarcate, is characterized in that, comprise the steps:
Step 1, opens the hatch door of vacuum bunch passage, opens laser instrument, measurement of paralleism CCD camera and displacement measurement CCD camera; The laser beam that laser instrument is launched arrives the first half-reflection and half-transmission level crossing through the second half-reflection and half-transmission level crossing, wherein, the intersection point of laser beam and the second half-reflection and half-transmission level crossing is defined as B point, the intersection point of laser beam and the first half-reflection and half-transmission level crossing is defined as C point, on a part of Transmission light to the first imaging screen frosted glass plate of C point, to be taken pictures imaging by displacement measurement CCD camera, another part reflexes on the second half-reflection and half-transmission level crossing, and through the second half-reflection and half-transmission flat mirror reflects on the second imaging screen frosted glass plate, to be taken pictures imaging by measurement of paralleism CCD camera; Wherein, the intersection point of laser reflection light and the second half-reflection and half-transmission level crossing is defined as D point, the intersection point of laser reflection light and the second imaging screen frosted glass plate is defined as E point;
Step 2, coarse adjustment:
Step 2.1, is adjusted displacement and the attitude of front truck optical measurement platform or rear car optical measurement platform, the luminous point D on the second half-reflection and half-transmission level crossing is estimated with luminous point B and overlaps by servo control mechanism;
Step 2.2, carry out depth of parallelism correction: observe the imaging center whether imaging of E point in measurement of paralleism CCD camera is positioned at measurement of paralleism CCD camera, if, then the depth of parallelism is aimed at, and proceeds to step 2.3, otherwise, by servo control mechanism adjustment front truck or rear car optical measurement platform, make the imaging of E point in measurement of paralleism CCD camera be positioned at the imaging center of measurement of paralleism CCD camera, complete the depth of parallelism and correct, proceed to step 2.3;
Step 2.3, carry out height and horizontal shift correction: whether the imaging of hot spot in displacement measurement CCD camera observed on the first imaging screen frosted glass plate is positioned at the imaging center of displacement measurement CCD camera, if, then height and horizontal shift are aimed at, proceed to step 3, otherwise, by servo control mechanism adjustment front truck or rear car optical measurement platform, the imaging of hot spot in displacement measurement CCD camera on the first imaging screen frosted glass plate is made to be positioned at the imaging center of displacement measurement CCD camera, complete height and horizontal shift aligning, proceed to step 3;
Step 3, close the hatch door of vacuum bunch passage, vacuumize, after the vacuum tightness of vacuum bunch passage reaches vacuum level requirements, first carry out depth of parallelism correction, the laser facula that measurement of paralleism CCD camera is taken is positioned at its imaging center; Then carry out height and horizontal shift correction, the laser facula that displacement measurement CCD camera is taken is positioned at its imaging center, completes aiming between detector with x-ray source.
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