Device and method for correcting concentricity of lamp wick of hollow cathode lamp

Abstract

The invention discloses a hollow cathode lamp wick concentricity correction device and method.The hollow cathode lamp wick concentricity correction device comprises a hollow cathode lamp power source, a lamp holder fixing seat, a two-degree-of-freedom displacement table, an optical imaging unit, an image acquisition unit and an image processing unit, and the hollow cathode lamp power source is electrically connected with a to-be-corrected hollow cathode lamp to supply power to the to-be-corrected hollow cathode lamp; the lamp holder fixing seat is used for fixing the lamp holder, the two-degree-of-freedom displacement table is connected with the lamp shell and then used for adjusting the relative position of the lamp shell and the lamp holder, the optical axis of the optical imaging unit is arranged on the center axis of the lamp holder and used for obtaining light spots of light emitted by the hollow cathode lamp to be corrected, and the image collecting unit collects light spot images and transmits the light spot images to the image processing unit. And the image processing unit identifies the central position of a light spot in the image and determines the eccentricity of the lamp shell to control the two-degree-of-freedom displacement table to adjust the relative position of the lamp shell and the lamp holder. The assembling concentricity error of the lamp holder and the lamp shell of the hollow cathode lamp is controlled and corrected by utilizing the microscopic optical imaging technology, and the accuracy and the stability of the hollow cathode lamp are improved.

Description

Technical Field

[0001] The present invention relates to the field of analytical instruments, and in particular to a concentricity correction device and method for the lamp core of a hollow cathode lamp. Background Art

[0002] Analytical instruments are of great significance in many fields such as scientific research, industrial production, environmental protection, and medical diagnosis. As an important analytical instrument, atomic absorption spectrometers provide us with a new perspective to observe and understand the microscopic world, and provide strong support for scientific research and technological progress in various fields. Hollow cathode lamps play roles such as providing sharp line spectra and improving the accuracy and sensitivity of measurements in atomic spectroscopy analysis. It works by applying a voltage between two electrodes, causing electrons to shoot from the cathode at high speed towards the anode, colliding and ionizing with inert gases. Positive ions bombard the cathode surface, sputtering out metal atoms and exciting them, thereby emitting characteristic spectral lines. The manufacturing process of hollow cathode lamps directly affects their performance. Among them, the concentricity of the lamp core of the hollow cathode lamp affects the collimation of the sharp line spectrum, and further affects indicators such as the signal-to-noise ratio and sensitivity of the instrument. Therefore, manufacturers at home and abroad have tried to control the concentricity error of the lamp core of the hollow cathode lamp by using methods such as precise structural design and mechanical tooling. However, these methods have large errors and poor repeatability, and cannot achieve precise control. These problems limit the further improvement of instrument performance and pose obstacles to related technical research. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies of the existing technology. By using microscopic optical imaging technology, the cathode spot of the lamp core of the hollow cathode lamp light source is microscopically magnified, and then the eccentricity and tilt angle of the lamp core of the hollow cathode lamp are adjusted through a precise adjustment mechanism to reduce the deviation, achieve precise control and correction of the error of the lamp core of the hollow cathode lamp light source, confine the actual assembly error within a reasonable range, and improve the stability and repeatability of the hollow cathode lamp.

[0004] The present invention provides the following technical solutions:

[0005] A concentricity correction device for the wick of a hollow cathode lamp, comprising a hollow cathode lamp power supply, a lamp holder fixing base, a two-degree-of-freedom displacement stage, an optical imaging unit, an image acquisition unit, and an image processing unit. The hollow cathode lamp power supply is electrically connected to the hollow cathode lamp to be corrected to supply power to the hollow cathode lamp to be corrected. The lamp holder fixing base is used to fix the lamp holder. After the two-degree-of-freedom displacement stage is connected to the lamp housing, it is used to adjust the relative position of the lamp housing and the lamp holder. The optical axis of the optical imaging unit is set on the central axis of the lamp holder to obtain the light spot of the light emitted by the hollow cathode lamp to be corrected. The image acquisition unit acquires the light spot image and transmits it to the image processing unit. The image processing unit identifies the central position of the light spot in the image, determines the eccentricity of the lamp housing, and controls the two-degree-of-freedom displacement stage to adjust the relative position of the lamp housing and the lamp holder. The wick is located inside the lamp housing, the lamp housing is assembled with the lamp holder, and the position of the wick and the lamp housing is fixed. At the same time, the lamp holder fixing base and the lamp holder are coaxial. The problem of wick concentricity that this application needs to solve is the problem caused by the assembly offset of the lamp housing and the lamp holder. By analyzing the light spot image of the light emitted by the hollow cathode lamp, the eccentricity of the wick can be obtained, so as to adjust the assembly offset of the lamp housing and the lamp holder, with high correction accuracy and automatic correction. The two-degree-of-freedom displacement stage drives the lamp housing or the lamp holder to move in the xz axis, and after the concentricity of the lamp housing and the lamp holder reaches the standard, the connection between the lamp housing and the lamp holder is glued and cured.

[0006] The optical imaging unit includes a lens group, a right-angle prism, and a high-precision graticule. The light emitted by the hollow cathode lamp to be corrected passes through the lens group and is reflected by the right-angle prism onto the high-precision graticule to form an enlarged light spot image. The lens group diffuses and shapes the light beam, and through the reflection of the right-angle prism, an enlarged light spot is formed without chromatic aberration.

[0007] The correction device further includes a laser and another two-degree-of-freedom displacement stage. After the lamp holder fixing base is set on the other two-degree-of-freedom displacement stage, the laser is used as a light source to first adjust the centers of the lamp holder fixing base and the optical imaging unit to be coaxial.

[0008] There are size scales on the high-precision graticule.

[0009] The image acquisition unit includes a microscope and a CCD camera. The microscope is arranged facing the high-precision graticule, and the microscope is connected to the CCD camera. The microscope magnifies the light spot image on the high-precision graticule and the magnified image is acquired by the CCD camera. The magnification of the microscope is set according to the accuracy requirement of the offset. For example, if the requirement for the offset is in millimeters, then the microscope must be able to clearly distinguish the scale of 0.1 millimeter.

[0010] The hollow cathode lamp power supply includes a lamp driver board, a switching power supply, a power frequency transformer, a core board, a potentiometer, and an ammeter head. The switching power supply, the power frequency transformer, the core board, the potentiometer, and the ammeter head are respectively connected to the lamp driver board. The lamp driver board is connected to the hollow cathode lamp socket. The 220V AC mains is converted into low-voltage DC power by the switching power supply to supply power to the lamp driver board. The 220V AC mains is converted into 300V AC by the power frequency transformer and then becomes about 480V DC after being rectified by the lamp driver board, which is used as the starting voltage of the hollow cathode lamp. The potentiometer provides a DC voltage to the lamp driver board. The core board provides a pulse signal to the lamp driver board. The lamp driver board converts the DC voltage provided by the potentiometer into a pulse voltage through the pulse signal to provide a stable pulse current for the lamp core of the hollow cathode lamp. An ammeter head is connected in series in the connection line between the lamp driver board and the hollow cathode lamp socket, and the ammeter head real-time displays the filament current value of the hollow cathode lamp.

[0011] The image processing unit includes a display.

[0012] The present invention also provides a method for correcting the concentricity of the hollow cathode lamp core, including the following steps:

[0013] 1) Fix the socket of the hollow cathode lamp to be corrected on the socket fixing seat, clamp the lamp shell on a two-degree-of-freedom displacement stage, supply power to the hollow cathode lamp to be corrected by the hollow cathode lamp power supply, and the hollow cathode lamp is lit;

[0014] 2) The light emitted by the hollow cathode lamp forms a light spot on the optical imaging unit;

[0015] 3) The image acquisition unit acquires the light spot image on the optical imaging unit;

[0016] 4) The image acquisition unit transmits the light spot image to the image processing unit, and the image processing unit identifies the center position of the light spot in the image to determine the eccentricity of the lamp shell;

[0017] 5) The image processing unit controls the two-degree-of-freedom displacement stage to adjust the relative position between the lamp shell and the socket according to the eccentricity of the lamp core so that the lamp shell and the socket are coaxial.

[0018] The optical imaging unit includes a lens group, a right-angle prism, and a high-precision graticule. The light emitted by the hollow cathode lamp to be corrected passes through the object and is reflected by the right-angle prism to the high-precision graticule through the lens group to form an enlarged light spot image.

[0019] Before the lamp housing is clamped on the two - degree - of - freedom displacement stage, set the lamp socket fixing base on another two - degree - of - freedom displacement stage. Use the laser as the light source and adjust the centers of the lamp socket fixing base and the optical imaging unit to be coaxial. Specifically, the lamp socket fixing base can be set on another two - degree - of - freedom displacement stage. Use the laser as the light source to emit light passing through the lamp socket fixing base to form a light spot on the optical imaging unit; the image acquisition unit acquires the light spot image on the optical imaging unit; the image processing unit controls the two - degree - of - freedom displacement stage to adjust the coaxiality of the center of the lamp socket fixing base and the center of the optical imaging unit according to the offset between the center position of the light spot image and the center position of the high - precision graticule.

[0020] There are size scale lines on the high - precision graticule.

[0021] The image acquisition unit includes a microscope and a CCD camera. The microscope magnifies the cathode light spot image with size scale lines, and then the CCD camera acquires the magnified cathode light spot image data and transmits it to the image processing unit.

[0022] After the image processing unit identifies the edge contour of the light spot in the light spot image, it determines the geometric center of the light spot and further determines the eccentricity of the lamp housing of the hollow cathode lamp.

[0023] The image processing unit calculates the eccentricity Δy of the lamp housing according to the distance Δx between the geometric center of the light spot and the center position of the high - precision graticule, and the optical magnification coefficient K of the optical imaging unit. The calculation formula is: Δy = K×Δx. This distance Δx can be the distance on the x - axis or the z - axis.

[0024] The present invention uses optical imaging technology to control and correct the assembly concentricity error between the lamp socket and the lamp housing of the hollow cathode lamp by directly receiving and analyzing the light spot image formed by the light emitted by the hollow cathode lamp, improving the accuracy and stability performance of the hollow cathode lamp. The light source of the present invention is the luminous point of the lamp core. Through the adjustment of the two - degree - of - freedom displacement stage, it is made concentric with the lamp socket that has already been concentric with the optical system, so as to ensure that the lamp core located in the lamp housing is concentric with the lamp socket when they are cured and connected with quick - drying glue, thus improving the overall concentricity level of the hollow cathode lamp.

[0025] The positive effects brought by the present invention are as follows: First, using microscopic optical imaging technology to solve the problems of low precision, large error and uncontrollable error in the production and manufacturing methods of existing hollow cathode lamps, improving the accuracy and stability of the hollow cathode lamp light source. Second, using the method of optical visual measurement and intelligent image software processing to replace the traditional manual operation for the assembly and debugging of hollow cathode lamps, not only improving the production and manufacturing efficiency, but also ensuring the quality and repeatability of hollow cathode lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the concentricity correction device for the lamp core of the hollow cathode lamp of the present invention;

[0027] Figure 2 Another structural schematic diagram (with a laser) of the concentricity correction device for the lamp core of the hollow cathode lamp of the present invention;

[0028] Figure 3 Structural schematic diagram of the power supply of the hollow cathode lamp of the present invention;

[0029] Figure 4 Schematic diagram of the light spot of the present invention. Detailed implementation manners

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0031] As Figure 1-2 shown, a concentricity correction device for the lamp core of a hollow cathode lamp includes a hollow cathode lamp power supply 9, a lamp socket fixing seat 11, a two-degree-of-freedom displacement stage 2, an optical imaging unit 3, an image acquisition unit, and an image processing unit. The hollow cathode lamp power supply 9 is electrically connected to the hollow cathode lamp 1 to be corrected to supply power to the hollow cathode lamp 1 to be corrected. The lamp socket fixing seat 11 is used to fix the lamp socket 103. The two-degree-of-freedom displacement stage 2 is connected to the lamp housing 102 of the hollow cathode lamp 1 to be corrected to adjust the relative position between the lamp housing 102 and the lamp socket 103. The lamp core 101 is fixed in the lamp housing 102. The optical imaging unit 3 is arranged on the central axis ( Figure 1 the dotted line in, the lamp socket 103 is coaxial with the lamp socket fixing seat 11) of the lamp socket fixing seat 11 to obtain the light spot of the light emitted by the hollow cathode lamp to be corrected. The image acquisition unit acquires the light spot diagram and transmits it to the image processing unit. The image processing unit identifies the central position of the light spot in the image, determines the eccentricity of the lamp housing, and controls the two-degree-of-freedom displacement stage 2 of the lamp housing 102 to adjust the relative position between the lamp housing and the lamp socket of the hollow cathode lamp to be corrected.

[0032] The optical imaging unit 3 includes a lens group 301, a right-angle prism 302, and a high-precision graticule 303. The light emitted by the hollow cathode lamp 1 to be corrected is diffused and shaped by the lens group 301 and then reflected by the right-angle prism 302 onto the high-precision graticule 303 to form an enlarged light spot diagram.

[0033] The high-precision graticule 303 is engraved with high-precision dimension lines to characterize the eccentricity of the lamp core (or lamp housing) of the hollow cathode lamp. The minimum dimension line on the high-precision graticule 303 can reach 0.1 mm.

[0034] In order to further ensure the concentricity adjustment of the lamp housing and the lamp socket, as Figure 2As shown in the figure, the calibration device further includes a laser 12 and another two-degree-of-freedom displacement stage 10. The laser 12 is arranged behind the lamp holder fixing seat 11 as a light source. The light passes through the lamp holder fixing seat and forms a light spot on the optical imaging unit 3. The two-degree-of-freedom displacement stage 10 is used to adjust the lamp holder fixing seat 11 and the center of the optical imaging unit 3 to be coaxial.

[0035] The image acquisition unit includes a microscope 5 and a CCD camera 6. The microscope 5 is arranged opposite to the high-precision graticule 303. The microscope 5 is connected to the CCD camera 6. The microscope 5 magnifies the cathode light spot image on the high-precision graticule 303 and the CCD camera 6 acquires the magnified image. The microscope 5 and the CCD camera 6 perform microscopic magnification and acquisition on the images of the lamp wick 102 and the graticule, and transmit them to the image processing unit in real time through the HDMI data transmission line 8, such as the monitor 7 of a computer. The image processing unit identifies the edge contour of the light spot, determines the center position of the light spot, and then determines the deviation amount of the center position of the light spot from the center point of the size scale line on the high-precision graticule 303 according to the size scale line on the high-precision graticule 303. Finally, by adjusting the two-degree-of-freedom displacement stage 2, the relative positions of the lamp housing 102 and the lamp holder 103 are changed to make the two center points coincide, so as to realize the correction of the eccentricity error of the lamp wick.

[0036] The image acquisition unit may further include an LED lamp ring 4. The LED lamp ring 4 is fixed between the microscope and the high-precision graticule 303 and can illuminate the high-precision graticule 303.

[0037] Among them, the technical principle of the hollow cathode lamp power supply 9 is as Figure 3As shown in the figure. The 220V AC mains power is input from the power socket 901 and reaches the switching power supply 902 and the power frequency transformer 903 respectively. The 220V AC mains power is converted by the switching power supply 902 into several low-voltage direct currents to provide system power for the lamp driver board 905. The 220V AC mains power is converted by the power frequency transformer 903 into an alternating current of about 300V and reaches the lamp driver board 905. After being rectified by the lamp driver board 905, it becomes a direct current of about 480V and is used as the starting voltage of the hollow cathode lamp. The switching power supply 902 and the power frequency transformer 903 supply power to the lamp driver board 905. The core board 906 provides a pulse signal to the lamp driver board 905. The pulse signal controls the switching device on the lamp driver board 905 to convert the DC voltage provided by the potentiometer 904 into a pulse voltage. Then, combined with the constant current circuit on the lamp driver board 905, it provides a stable pulse current for the filament of the hollow cathode lamp. The direct current of about 480V after being rectified by the lamp driver board 905 provides the starting voltage for the anode of the hollow cathode lamp. An ammeter head 907 is connected in series in the connection line between the lamp driver board 905 and the hollow cathode lamp socket 103, and the current value of the hollow cathode lamp 103 at this time can be seen in real time. Since the current of the hollow cathode lamp core is pulsed, the value seen through the ammeter head 907 represents the average value of the filament current of the hollow cathode lamp. By adjusting the resistance value of the potentiometer 904, the filament current of the hollow cathode lamp can be adjusted, and the size of the filament current can be obtained by observing the indication of the ammeter head 907. The lamp driver board 905 connects the two signals of the starting voltage and the pulse current to the hollow cathode lamp socket 103 through the connection line. Among them, the starting voltage is connected to the anode of the hollow cathode lamp, and the pulse current is connected to the core of the hollow cathode lamp. After power-on, by adjusting the size of the potentiometer 904, the current of the hollow cathode lamp is changed from 0 to a suitable value, and then the hollow cathode lamp is lit.

[0038] The method of calibration using the concentricity correction device for the core of the hollow cathode lamp of the present invention is as follows:

[0039] First, clamp the lamp socket fixing base 11 on the two-degree-of-freedom displacement stage 10, turn on the laser 12, the light emitted by the laser 12 passes through the lamp socket fixing base 11, and adjust the center of the lamp socket fixing base 11 to be coaxial with the center of the optical imaging unit 3.

[0040] Then, the lamp holder 103 of the hollow cathode lamp is clamped onto the lamp holder fixing base 11, and the lamp shell 102 of the hollow cathode lamp is clamped on the two-degree-of-freedom displacement stage 2. The hollow cathode lamp power supply 9 supplies power to the hollow cathode lamp, and the hollow cathode lamp is lit. The LED lamp ring 4 is turned on. The LED lamp ring 4 can provide uniform and shadowless illumination for the high-precision graticule 303. The light spot of the lamp core 101 is imaged on the high-precision graticule 303 through the lens group 301 and the right-angle prism 302 of the optical imaging unit 3. High-precision dimension lines are engraved on the high-precision graticule 303 to characterize the eccentricity of the lamp core of the hollow cathode lamp. The microscope 5 magnifies the image formed by the light spot emitted by the lamp core 101 through the optical imaging center on the high-precision graticule 303 by microscopic imaging. The CCD camera 6 captures the magnified image in real time and uploads it to the display 7. The light spot image is as Figure 4 shown. The image processing unit is responsible for processing the acquired image, identifying the edge contour of the light spot and determining the center position of the light spot, and further determining the eccentricity of the lamp core of the hollow cathode lamp. After determining the eccentricity of the lamp core of the hollow cathode lamp, the correction of the lamp core eccentricity is realized through the two-degree-of-freedom displacement stage 2.

[0041] The image processing unit identifies and processes the images of the lamp core of the hollow cathode lamp and the lines on the high-precision graticule displayed on the display 7, and identifies the edge contour of the light spot to determine the geometric center position of the light spot (this can also be considered as the geometric center of the lamp core). The distance between the geometric center position of the light spot on the display and the center position of the high-precision graticule is Δx. Δx is not the actual eccentricity of the hollow cathode lamp. It is necessary to calculate Δy according to the optical magnification coefficient K of the imaging system composed of the lens group 301 and the right-angle prism 302. Δy is the actual eccentricity of the lamp core. The calculation formula is: Δy = K × Δx.

[0042] In the description of this specification, the reference terms "front" and "rear" are based on the optical path direction, and the forward direction of light is the front.

[0043] In the description of this specification, the descriptions of reference terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hollow cathode lamp wick concentricity correction device, characterized in that: The invention comprises a hollow cathode lamp power supply, a lamp holder fixing seat, a two-degree-of-freedom translation stage, an optical imaging unit, an image acquisition unit and an image processing unit. The hollow cathode lamp power supply is electrically connected to the hollow cathode lamp to be corrected to supply power to the hollow cathode lamp to be corrected. The lamp holder fixing seat is used to fix the lamp holder. The two-degree-of-freedom translation stage is used to adjust the relative position of the lamp housing and the lamp holder after being connected to the lamp housing. The optical axis of the optical imaging unit is arranged on the central axis of the lamp holder to obtain the light spot emitted by the hollow cathode lamp to be corrected. The image acquisition unit acquires the light spot image and transmits it to the image processing unit. The image processing unit identifies the center position of the light spot in the image, determines the eccentricity of the lamp housing, and controls the relative position of the lamp housing and the lamp holder adjusted by the two-degree-of-freedom translation stage.

2. The hollow cathode lamp wick concentricity correction device according to claim 1, characterized in that: The optical imaging unit includes a lens group, a right-angle prism and a high-precision graticule. The light emitted by the hollow cathode lamp to be corrected passes through the lens group and is reflected by the right-angle prism onto the high-precision graticule to form an enlarged light spot pattern.

3. The hollow cathode lamp wick concentricity correction device according to claim 2, characterized in that: The calibration device also includes a laser and another two free displacement platforms, on which the lamp holder fixing seat is arranged. The laser is used as a light source to first adjust the center of the lamp holder fixing seat and the center of the optical imaging unit to be coaxial.

4. The hollow cathode lamp wick concentricity correction device according to claim 1, characterized in that: The image acquisition unit includes a microscope and a CCD camera. The microscope is arranged opposite to the high-precision graticule plate and connected to the CCD camera. The microscope enlarges the spot image on the high-precision graticule plate and the CCD camera acquires the enlarged image.

5. The hollow cathode lamp wick concentricity correction device according to claim 1, characterized in that: The hollow cathode lamp power supply includes a lamp driver board, a switching power supply, an industrial frequency transformer, a core board, a potentiometer and an ammeter. The switching power supply, the industrial frequency transformer, the core board, the potentiometer and the ammeter are respectively connected to the lamp driver board, and the lamp driver board is connected to the hollow cathode lamp holder. The 220V AC mains is converted into low-voltage DC power by the switching power supply to power the lamp driver board. The 220V AC mains is converted into 300V AC power by the industrial frequency transformer, and is rectified by the lamp driver board to become DC power of about 480V, which is used as the starting voltage of the hollow cathode lamp. The potentiometer provides a DC voltage to the lamp driver board, and the core board provides a pulse signal to the lamp driver board. The lamp driver board converts the DC voltage provided by the potentiometer into a pulse voltage through the pulse signal to provide a stable pulse current for the filament of the hollow cathode lamp. An ammeter is connected in series in the connecting line between the lamp driver board and the hollow cathode lamp holder, and the ammeter displays the filament current value of the hollow cathode lamp in real time.

6. A method for calibrating the concentricity of a hollow cathode lamp wick, characterized in that: The steps include: 1) Fix the lamp holder of the hollow cathode lamp to be calibrated on the lamp holder fixing seat, clamp the lamp housing on a one-two degree-of-freedom displacement platform, and power the hollow cathode lamp to be calibrated with the hollow cathode lamp power supply, so that the hollow cathode lamp is lit; 2) The light emitted by the hollow cathode lamp forms a light spot on the optical imaging unit; 3) The image acquisition unit acquires the spot image on the optical imaging unit; 4) The image acquisition unit transmits the light spot image to the image processing unit, and the image processing unit identifies the center position of the light spot in the image and determines the eccentricity of the lamp housing; 5) The image processing unit controls the two-degree-of-freedom translation stage to adjust the relative position of the lamp housing and the lamp holder according to the eccentricity of the lamp housing so that the lamp housing and the lamp holder are coaxial.

7. The method for calibrating the concentricity of a hollow cathode lamp wick according to claim 6, characterized in that: The optical imaging unit includes a lens group, a right-angle prism and a high-precision graticule. The light emitted by the hollow cathode lamp to be corrected passes through the lens group and is reflected by the right-angle prism onto the high-precision graticule to form an amplified light spot pattern.

8. The method for calibrating the concentricity of a hollow cathode lamp wick according to claim 7, characterized in that: Before the lamp housing is clamped on the two-degree-of-freedom translation platform, the lamp holder is set on another two-degree-of-freedom translation platform, the laser is used as the light source, and the center of the lamp holder and the center of the optical imaging unit are adjusted to be coaxial.

9. The method for calibrating the concentricity of a hollow cathode lamp wick according to claim 8, characterized in that: The image processing unit identifies the edge contour of the light spot in the light spot image and determines the geometric center of the light spot, and further determines the eccentricity of the lamp shell of the hollow cathode lamp.

10. The hollow cathode lamp wick concentricity correction method according to claim 9, characterized in that: The image processing unit calculates the lamp housing eccentricity Δy according to the distance Δx between the geometric center of the light spot and the center position of the high-precision graticule, and the optical magnification coefficient K of the optical imaging unit. The calculation formula is: Δy=K×Δx.

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