Moving grating monochromator

Abstract

The utility model relates to a moving grating monochromator, and belongs to the technical field of monochromators. The monochromator comprises a shell, an inlet slit, a collimating lens, a grating, a chassis, a focus lens, an outlet slit, a driving motor, a worm and a worm gear, the inlet slit, the collimating lens, the grating, the focus lens and the outlet slit are arranged in the shell according to a light path propagation path, the chassis is arranged on the bottom side of the grating, the bottom side of the chassis is slidably mounted on the shell through a rotating shaft and a gear, and the worm gear is arranged on the worm. A driving motor is arranged on the shell, an output shaft of the driving motor is connected with a worm through a coupler, two ends of the worm are fixed inside the shell through bearing seats, the worm is connected with a worm gear, a transmission shaft is arranged in the worm gear, the bottom of the transmission shaft is mounted on the shell through a bearing, and the top of the transmission shaft is meshed with a chassis. According to the utility model, the position of the grating can be accurately adjusted, the accurate control of light splitting is ensured, and meanwhile, the driving element is externally connected by utilizing the structural design, so that the impurity influence on the light path propagation in the monochromator is avoided.

Description

Technical Field

[0001] The utility model relates to a moving grating monochromator, belonging to the technical field of monochromators. Background Art

[0002] A spectrometer is a scientific instrument that decomposes polychromatic light into a series of monochromatic lights. The spectrometer can analyze the characteristics or composition of substances by detecting the characteristic spectral lines of active or passive luminescent substances within a certain wavelength range. Therefore, it can be widely applied in fields such as food and drug inspection, environmental monitoring, chemical analysis, etc.

[0003] A monochromator is a component in a spectral instrument that produces monochromatic light. Most existing monochromators are composed of an entrance slit, a collimating mirror, a grating, a focusing mirror, an exit slit, etc. Its working principle is that the composite light is incident on the collimating mirror through the slit, is converted into parallel light by the collimating mirror and then incident on the grating, the composite light is decomposed into monochromatic light by the grating, the decomposed monochromatic light is focused into a tiny spot by the focusing mirror, and exits through the exit slit. The gratings of existing monochromators are basically fixed, and it is very difficult to perform spectroscopic adjustment control. Chinese patent document CN211978680U discloses a multi-dimensional adjustable micro spectrometer. Although this spectrometer can adjust the position of the grating, it directly uses a turntable for adjustment, and the adjustment accuracy is relatively low, making it difficult to achieve precise spectroscopic control. Moreover, the turntable and the optical path components are integrally integrated in the housing, and it is easy to generate impurities during the driving operation of the turntable, affecting the optical path propagation. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a moving grating monochromator, which can precisely adjust the position of the grating to ensure precise spectroscopic control. At the same time, through structural design, the driving element is externally connected to avoid the influence of impurities on the optical path propagation inside the monochromator.

[0005] The technical solution of the utility model is as follows:

[0006] A moving grating monochromator includes a housing, an entrance slit, a collimating mirror, a grating, a chassis, a focusing mirror, an exit slit, a driving motor, a worm, and a worm gear. Among them,

[0007] The entrance slit, the collimating mirror, the grating, the focusing mirror, and the exit slit are arranged in the housing according to the optical path propagation path. A chassis is arranged on the bottom side of the grating. The bottom side of the chassis is installed on the housing through a rotating shaft and a bearing. A driving motor is arranged on the housing. The output shaft of the driving motor is connected with a worm through a coupling. Both ends of the worm are fixed to the inside of the housing through bearing seats. The worm is connected with a worm gear. A transmission shaft is arranged inside the worm gear. The bottom of the transmission shaft is installed on the housing through a bearing. The top of the transmission shaft is meshed with the chassis. Meshing teeth are arranged on both the top of the chassis and the transmission shaft to facilitate meshing transmission.

[0008] Preferably according to the present utility model, the drive motor is arranged outside the housing, and the output shaft of the drive motor extends into the housing. By placing the drive motor outside, it is possible to avoid the impurities generated during the operation of the drive motor from contaminating the internal environment of the housing.

[0009] Preferably according to the present utility model, the diameter of the transmission shaft is smaller than the diameter of the worm gear, and the diameter of the worm gear is smaller than the diameter of the chassis. By adjusting the overall transmission ratio, the rotation accuracy of the chassis can be improved, thereby achieving precise adjustment of the grating.

[0010] During use, the exit slit is externally connected to a CCD camera, and the CCD camera is connected to a computer through an A / D converter. The composite light is incident from the entrance slit onto the collimating mirror, passes through the grating, the focusing mirror, and the exit slit, and then exits to the CCD camera. The light spot collected by the CCD camera is transmitted to the computer through the A / D converter for spectral analysis. If spectroscopic adjustment is required, the drive motor is controlled to rotate to adjust the direction of the grating, thereby adjusting the spectroscopy.

[0011] The beneficial effects of the present utility model are as follows:

[0012] The present utility model provides a moving grating monochromator, which uses a worm and worm gear structure in cooperation with a chassis to precisely adjust the position of the grating, ensuring precise control of spectroscopy. At the same time, through structural design, the driving element is externally connected to avoid the influence of impurities on the optical path propagation inside the monochromator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is a schematic structural diagram of the chassis of the present utility model;

[0015] Wherein: 1, entrance slit; 2, collimating mirror; 3, grating; 4, focusing mirror; 5, exit slit; 6, drive motor; 7, coupling; 8, worm; 9, worm gear; 10, chassis; 11, housing; 12, transmission shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following is further described by way of examples in conjunction with the drawings, but not limited thereto.

[0017] Example 1:

[0018] As Figure 1-2 shown, this example provides a moving grating monochromator, including a housing 11, an entrance slit 1, a collimating mirror 2, a grating 3, a chassis 10, a focusing mirror 4, an exit slit 5, a drive motor 6, a worm 8, and a worm gear 9. Among them,

[0019] Inside the housing 11, an entrance slit 1, a collimating mirror 2, a grating 3, a focusing mirror 4, and an exit slit 5 are arranged according to the optical path propagation path. A chassis 10 is provided on the bottom side of the grating 3. The bottom side of the chassis 10 is installed in the housing 11 through a rotating shaft and bearings. A driving motor 6 is provided on the housing 11. The output shaft of the driving motor 6 is connected to a worm 8 through a coupling 7. Both ends of the worm 8 are fixed inside the housing 11 through bearing seats. The worm 8 is connected to a worm gear 9. A transmission shaft 12 is fixedly arranged inside the worm gear 9. The bottom of the transmission shaft is installed in the housing 11 through a bearing. The top of the transmission shaft 12 is meshed with the chassis 10. Meshing teeth are provided on both the top of the chassis and the transmission shaft to facilitate meshing transmission.

[0020] The driving motor 6 is arranged outside the housing 11, and the output shaft of the driving motor 6 extends into the housing 11. By placing the driving motor outside, impurities generated during the operation of the driving motor are prevented from contaminating the internal environment of the housing.

[0021] The diameter of the transmission shaft 12 is smaller than the diameter of the worm gear 9, and the diameter of the worm gear 9 is smaller than the diameter of the chassis 10. By adjusting the overall transmission ratio, the rotation accuracy of the chassis is improved, and precise adjustment of the grating is achieved.

[0022] During use, the exit slit is externally connected to a CCD camera. The CCD camera is connected to a computer through an A / D converter. The composite light is incident from the entrance slit to the collimating mirror, passes through the grating, the focusing mirror, and the exit slit, and then exits to the CCD camera. The light spot collected by the CCD camera is transmitted to the computer through the A / D converter for spectral analysis. If spectroscopic adjustment is required, the driving motor is controlled to rotate to adjust the direction of the grating, thereby adjusting the spectroscopy.

[0023] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A moving grating monochromator, characterized in that, It includes a housing, an entrance slit, a collimating mirror, a grating, a chassis, a focusing mirror, an exit slit, a drive motor, a worm, and a worm gear. Among them, inside the housing, an entrance slit, a collimating mirror, a grating, a focusing mirror, and an exit slit are arranged according to the optical path propagation path. A chassis is provided on the bottom side of the grating. The bottom side of the chassis is installed on the housing through a rotating shaft and a bearing. A drive motor is provided on the housing. The output shaft of the drive motor is connected with a worm through a coupling. Both ends of the worm are fixed inside the housing through bearing seats. The worm is connected with a worm gear. A transmission shaft is arranged inside the worm gear. The bottom of the transmission shaft is installed on the housing through a bearing. The top of the transmission shaft is meshed and connected with the chassis.

2. The moving grating monochromator according to claim 1, wherein, The drive motor is arranged outside the housing, and the output shaft of the drive motor extends into the housing.

3. The moving grating monochromator according to claim 1, wherein The diameter of the transmission shaft is smaller than the diameter of the worm gear, and the diameter of the worm gear is smaller than the diameter of the chassis.

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