Improved high-frequency monochromator and light splitting method

Abstract

The invention provides an improved high-frequency monochromator and a light splitting method thereof, and the method is characterized in that polychromatic light enters an entrance slit, is split by a spectrometer, and then is emitted through a spectrum scanning slit at a field diaphragm, a linear scanning module and an emergent optical fiber; a linear scanning module is also arranged at the position of the field diaphragm, namely the spectral imaging position, and the linear scanning module is arranged perpendicular to an imaging optical axis, linearly moves along the spectral arrangement direction after spectral splitting and scans one by one; gradually coupling the monochromatic light into the input end of the receiving optical fiber, and sequentially obtaining monochromatic light output at the output end; and the control module is used for controlling the exposure imaging sequence according to a one-frame one-color mode, namely controlling the linear scanning spectrum emergent sequence. The light path is simple in structure, and can meet the requirement of high-speed exposure in combination with a special exposure mode.

Description

Technical Field

[0001] This invention belongs to the field of spectroscopic instrument technology, particularly the field of monochromator technology, and specifically relates to an improved high-frequency monochromator and its spectroscopic method. Background Technology

[0002] In existing technologies, monochromators are generally used as light sources to provide standard monochromatic light sources for tasks such as spectral calibration of optical systems.

[0003] Existing monochromators typically employ a dual-CT structure to create a symmetrical configuration, maintaining good monochromaticity while providing excellent residual aberration correction. Their optical principle generally involves white light (polychromatic light) entering the collimating system through an entrance slit. The collimating system transforms the incident light into a collimated parallel beam, which then enters a plane grating. The plane grating disperses the incident white light into monochromatic beams, which then exit. These monochromatic beams from the plane grating enter a converging optical system, which converges the exit beams near the exit slit, forming a monochromatic slit image arranged sequentially (color bands). The monochromatic beams dispersed by the grating are then arranged according to the dispersion rules and appear near the exit slit. By rotating the plane grating, the angle of incidence of the incident white light relative to the grating changes, thereby altering the position of the dispersed monochromatic light at the exit slit. Through selective transmission through the slit, the monochromatic light exits and is used for measuring or calibrating the spectral characteristics of the optical system.

[0004] However, the problem is that the existing optical path structure combined with the exposure method cannot meet the needs of high-speed exposure (the operation is slow). Summary of the Invention

[0005] In view of the above problems, this application proposes a high-frequency monochromator with a simple exposure structure and a spectral dispersion method to address the technical problems of existing monochromators.

[0006] This application provides an improved high-frequency monochromator, including an entrance slit, a spectrometer, and a scanning and emission mechanism; an emission fiber assembly is loaded after the emission beam from the spectrometer, characterized in that: the emission fiber assembly consists of an emission fiber, a linear scanning module, and a control module.

[0007] Polychromatic light is incident through the entrance slit and then dispersed by a spectrometer. A spectral scanning slit, matching the image width of the entrance slit, is provided at the field stop. The spectral scanning slit is then connected to an output optical fiber that matches the slit.

[0008] A linear scanning module is also provided at the field stop position. The linear scanning module is set perpendicular to the imaging optical axis and moves in a straight line along the direction of the spectral arrangement after beam splitting, scanning one by one. Monochromatic light is coupled into the input end of the receiving optical fiber one by one, and monochromatic light is output sequentially at the output end.

[0009] The control module controls the exposure imaging sequence in a one-frame-one-color manner, that is, controls the linear scanning spectral emission sequence.

[0010] Furthermore, the spectral scanning slit is used to connect the output fiber, and the output fiber also has a coupling optical system.

[0011] Furthermore, the coupling lens group is a lens or a mirror, and the resolution of the optical component is adapted to the resolution of the spectrum and the position of the motor.

[0012] Furthermore, at the entrance slit, the incident light can be guided into the entrance slit using optical fibers, lenses, and various lighting devices.

[0013] This application also provides a method for spectroscopic observation using a monochromator, characterized by the following steps when using the aforementioned high-frequency monochromator:

[0014] Polychromatic light is incident through the entrance slit, and after being dispersed by the spectrometer, it exits through the spectral scanning slit at the field stop, the linear scanning module, and the output fiber.

[0015] The field stop position is the beam splitting imaging position. A linear scanning module is also set here. The linear scanning module is set perpendicular to the imaging optical axis and moves in a straight line along the direction of the spectral arrangement after beam splitting, scanning one by one. Monochromatic light is coupled into the input end of the receiving optical fiber one by one, and monochromatic light is output sequentially at the output end.

[0016] The control module controls the exposure imaging sequence in a one-frame-one-color manner, that is, controls the linear scanning spectral emission sequence.

[0017] Compared with the prior art, this application has the following advantages: the optical path structure is simple, and on the one hand, it can be connected to lighting equipment for monochrome lighting; on the other hand, it can adopt a one-frame-one-color exposure method, which is suitable for the needs of high-speed exposure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the working principle of the improved high-frequency monochromator of the present invention.

[0019] Figure 2 This is a schematic diagram of the control module of the improved high-frequency monochromator of the present invention.

[0020] Figure 3 This is a schematic diagram of the preferred spectrometer in the improved high-frequency monochromator of the present invention.

[0021] Explanation of markings in the diagram:

[0022] 1. Incident fiber, 2. Spectrometer, 3. Linear scanning module, 4. Outgoing fiber, 5. Spectral scanning slit, 6. Control module, 7. Image processing module, 8. Hyperspectral cube data, 9. Hyperspectral cube image.

[0023] 21. Entrance slit, 22. Convex grating, 11. Field stop. Detailed Implementation

[0024] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It is believed that those skilled in the art will be able to fully understand the technical solution of this case.

[0025] Example 1

[0026] like Figure 1-2 As shown, this embodiment provides an improved high-frequency monochromator, including an entrance slit, a spectrometer, and a scanning and exiting mechanism; its characteristic is that it further includes an exiting optical fiber, a linear scanning module, and a control module.

[0027] Polychromatic light is incident through the entrance slit and then dispersed by a spectrometer. A spectral scanning slit, matching the image width of the entrance slit, is provided at the field stop. The spectral scanning slit is then connected to an output optical fiber that matches the slit.

[0028] A linear scanning module is also provided at the field stop position. The linear scanning module is set perpendicular to the imaging optical axis and moves in a straight line along the direction of the spectral arrangement after beam splitting, scanning one by one. Monochromatic light is coupled into the input end of the receiving optical fiber one by one, and monochromatic light is output sequentially at the output end.

[0029] The control module controls the exposure imaging sequence in a one-frame-one-color manner, controlling the linear scanning spectral emission sequence. In this embodiment, for example, the control module controls the exposure imaging sequence by sequentially collecting monochromatic light images of various wavelengths and arranging them according to the spectral sequence.

[0030] In this embodiment, the spectral scanning slit adapter fiber and the outgoing fiber also have a coupling optical system.

[0031] In this embodiment, the coupling lens group is a lens or a mirror, and the resolution of the collimating optical component is adapted to the resolution of the spectrum and the position of the motor.

[0032] In this embodiment, at the entrance slit, the incident light can be guided into the entrance slit using optical fibers, lenses, and various lighting devices.

[0033] In this embodiment, the selected spectrometer can be any conventional spectrometer.

[0034] In this embodiment, the linewidth of the slit affects the spectral resolution and energy of the spectrometer; the slit (the furthest one in the figure) has a linewidth that affects both the spectral resolution and energy of the spectrometer. It can be adjusted as needed.

[0035] This embodiment provides a spectroscopic method using a monochromator, characterized by the following steps when using the aforementioned high-frequency monochromator:

[0036] Polychromatic light is incident through the entrance slit, and after being dispersed by the spectrometer, it exits through the spectral scanning slit at the field stop, the linear scanning module, and the output fiber.

[0037] A linear scanning module is also provided at the field stop position, which is the beam splitting imaging position. The linear scanning module is set perpendicular to the imaging optical axis and moves linearly along the direction of the spectrum arrangement after beam splitting, scanning one by one; the monochromatic light is coupled into the input end of the receiving optical fiber one by one, and monochromatic light is output sequentially at the output end;

[0038] The control module controls the exposure imaging sequence and the linear scanning spectral emission sequence in a one-frame-one-color manner.

[0039] Furthermore, the outgoing optical fiber can also be connected to lighting equipment for monochromatic lighting.

[0040] Furthermore, the feature is that a rotating mirror or a rotating mirror with grating beam splitting function is set at the entrance pupil and exit pupil of the collimating optical component and the converging imaging component, which facilitates efficient utilization of the input and output beam energy.

[0041] Example 2

[0042] like Figure 3 As shown in the figure, based on the first embodiment, the spectrometer is preferably a spectrometer with a convex grating. The structure of the spectrometer is shown in the schematic diagram, including an entrance slit 21, a mirror, a convex grating 22, an exit slit 23 or a field stop 11, and the entrance slit 21, the exit slit 23 or the field stop 11, the mirror, the convex grating 22, the exit slit 23 or the field stop 11, the mirror, the convex grating 22, the exit slit 23 or the field stop 11 are arranged sequentially along the optical path.

[0043] In this embodiment, a convex grating is used as the beam-splitting element. The convex grating does not need to rotate during the beam splitting process, thus ensuring that the position of the emitted monochromatic light is relatively fixed. A scanning optical system is then loaded after the emitted beam. The scanning mirror in the scanning optical system scans the monochromatic light into the emitted optical system, and the monochromatic light is emitted after the fixed emitted slit 3.

[0044] Of course, the beam splitter can also be a planar grating. The scanning optical system is loaded after the diffraction spectrum exit position. The scanning mirror in the scanning optical system scans the monochromatic light to the exit optical system and exits the monochromatic light after the fixed exit slit 3.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An improved high-frequency monochromator, comprising an entrance slit, a spectrometer, and a scanning emission mechanism, wherein an emission fiber assembly is loaded after the emission beam from the spectrometer, characterized in that: The outgoing fiber assembly consists of an outgoing fiber, a linear scanning module, and a control module. Polychromatic light is incident through the entrance slit and then dispersed by a spectrometer. A spectral scanning slit, matching the image width of the entrance slit, is provided at the field stop. The spectral scanning slit is then connected to an output optical fiber that matches the slit. A linear scanning module is also provided at the field stop position. The linear scanning module is set perpendicular to the imaging optical axis and moves in a straight line along the direction of the spectral arrangement after beam splitting, scanning one by one. Monochromatic light is coupled into the input end of the receiving optical fiber one by one, and monochromatic light is output sequentially at the output end. The control module controls the exposure imaging sequence in a one-frame-one-color manner, that is, controls the linear scanning spectral emission sequence.

2. The improved high-frequency monochromator according to claim 1, characterized in that, The spectral scanning slit is used to connect the output fiber, and the output fiber also has a coupling optical system.

3. An improved high-frequency monochromator according to claim 2, characterized in that, The coupled optical system is a lens or a mirror, and the resolution of the optical component is adapted to the resolution of the spectrum and the position of the motor.

4. An improved high-frequency monochromator according to claim 1, characterized in that, At the entrance slit, incident light can be guided into the slit using optical fibers, lenses, and various lighting devices.

5. A method for spectroscopic observation using a monochromator, characterized in that, Using the high-frequency monochromator as described in claim 1 includes the following steps: Polychromatic light is incident through the entrance slit, and after being dispersed by the spectrometer, it exits through the spectral scanning slit at the field stop, the linear scanning module, and the output fiber. The field stop position is the beam splitting imaging position. A linear scanning module is also set here. The linear scanning module is set perpendicular to the imaging optical axis and moves in a straight line along the direction of the spectral arrangement after beam splitting, scanning one by one. Monochromatic light is coupled into the input end of the receiving optical fiber one by one, and monochromatic light is output sequentially at the output end. The control module controls the exposure imaging sequence in a one-frame-one-color manner, that is, controls the linear scanning spectral emission sequence.

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