Fixed light path five-station switching spectrum acquisition system

Abstract

The invention relates to a testing instrument, in particular to a fixed-light-path five-station switching spectrum acquisition system which comprises a light source, a spectrograph and a sampling unit. The station switching device comprises a light path frame, a first light splitting piece, a second light splitting piece, a switching frame and a motor, the light source and the spectrograph are arranged on the first side of the light path frame, the sampling unit is arranged on the second side of the light path frame, and the motor is used for driving the switching frame to move between the first light splitting piece and the sampling unit; the first light splitting sheet and the second light splitting sheet are arranged perpendicular to each other, so that light emitted from the light source can enter the sampling unit after being refracted by the first light splitting sheet and is input into the spectrograph through the sampling unit, or the light emitted from the light source can be input into the spectrograph after being reflected by the first light splitting sheet and the second light splitting sheet; the switching frame is provided with a plurality of stations, and a shielding piece is connected to the switching frame. The sampling unit used for being connected with the sample pool is separated from the station switching device, and corrosion is avoided.

Description

Technical Field

[0001] The invention relates to a testing instrument, in particular to a fixed optical path five-station switching spectrum acquisition system. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] Existing near-infrared spectrometers mostly adopt a layout method in which the spectrometer and the light source are arranged opposite each other, wherein the light emitted by the light source passes through the sample or the standard film and then enters the spectrometer; a movable part is arranged between the light source and the spectrometer, and the movable part has four positions including the sample position, the reference position, the standard film position, and the dark current position. By moving the movable part laterally, the spectrometer can realize the switching function of collecting sample spectrum, collecting reference, collecting dark current, and collecting standard samples.

[0004] In the above structure, the sample is directly collected in the switching component where the movable part is located. Therefore, for example, in an acidic environment, the switching component is easily corroded and cannot meet the working condition requirements.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0006] The purpose of the present invention is to provide a fixed optical path five-station switching spectrum acquisition system, which can separate the sampling unit used to connect the sample pool from the station switching device through the setting of the first splitter and the second splitter, thereby avoiding the possibility of corrosion of the station switching device.

[0007] In order to achieve the above object, the present invention discloses the following fixed optical path five-station switching spectrum acquisition system, the fixed optical path five-station switching spectrum acquisition system comprising:

[0008] light source;

[0009] A spectrometer, wherein the spectrometer and the light source are arranged in parallel;

[0010] A sampling unit, wherein the sampling unit and the light source are arranged opposite to each other, and the sampling unit and the spectrometer are arranged opposite to each other;

[0011] A station switching device, the station switching device comprises an optical path frame, a first beam splitter, a second beam splitter, a switching frame, and a motor, the optical path frame having a first side and a second side arranged opposite to each other, the light source and the spectrometer being arranged on the first side of the optical path frame, the sampling unit being arranged on the second side of the optical path frame, the first beam splitter being mounted on the first side of the optical path frame and connected to the light source, the second beam splitter being mounted on the first side of the optical path frame and connected to the spectrometer, the second side of the optical path frame being connected to the sampling unit, the switching frame being arranged inside the optical path frame, the output end of the motor being connected to the switching frame, and the motor being used to drive the switching frame to move between the first beam splitter and the sampling unit;

[0012] The first beam splitter and the second beam splitter are arranged perpendicular to each other, so that the light emitted from the light source can enter the sampling unit after being refracted by the first beam splitter, and be input into the spectrometer through the sampling unit, or the light emitted from the light source can be input into the spectrometer after being reflected by the first beam splitter and the second beam splitter;

[0013] The switching frame has a plurality of stations arranged at intervals along the moving direction of the switching frame, so that when the motor drives the switching frame to move, the light emitted from the light source to the sampling unit can pass through different stations or be blocked;

[0014] The switching frame is connected with a shielding sheet, and the shielding sheet is used to shield the light refracted from the first beam splitter to the second beam splitter under the drive of the motor;

[0015] Wherein, the sampling unit is arranged on a side of the station switching device away from the light source and the spectrometer, and the sampling unit is detachably connected to an external sample pool.

[0016] As a further description of the above technical solution, the switching frame includes an external optical path position. When the motor drives the switching frame to move to the external optical path position, the light refracted by the light source through the first beam splitter completely passes through the switching frame and is input into the spectrometer via the sampling unit, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding plate.

[0017] As a further description of the above technical solution, the switching frame includes a standard sample station. When the motor drives the switching frame to move to the standard sample station, the light refracted by the light source through the first beam splitter passes through the standard sample station and is input into the spectrometer via the sampling unit, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding plate.

[0018] As a further description of the above technical solution, the switching frame includes a dark current position. When the motor drives the switching frame to move to the dark current position, the light refracted by the light source through the first beam splitter is completely blocked by the switching plate, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding plate.

[0019] As a further description of the above technical solution, the switching frame includes a standard film station. When the motor drives the switching frame to move to the standard film station, the light refracted by the light source through the first beam splitter passes through the standard film station and is input into the spectrometer via the sampling unit, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding film.

[0020] As a further description of the above technical solution, the switching frame includes an internal reference station. When the motor drives the switching frame to move to the internal reference station, the light refracted by the light source through the first beam splitter is completely blocked by the switching plate, and the reflected light between the first beam splitter and the second beam splitter is connected and input into the spectrometer.

[0021] As a further description of the above technical solution, a first trigger piece is installed on one side of the switching frame, and a first sensor is installed on one side of the motor. The first trigger piece is arranged opposite to the first sensor. When the motor drives the switching frame to move to the completely suspended external optical path position, the first trigger piece just triggers the first sensor, and the motor stops running.

[0022] As a further description of the above technical solution, a second trigger piece is installed on one side of the switching frame, and a second sensor is installed on one side of the motor. The second trigger piece is arranged opposite to the second sensor. When the motor drives the switching frame to move to the internal reference position that completely blocks the sampling light source, the second trigger piece just triggers the second sensor, and the motor stops running.

[0023] As a further description of the above technical solution, the workstation switching device also includes a guide rail, a slider, a coupling, a screw, and a screw nut. The slider is installed on the guide rail, the switching frame is installed on the slider, and the screw nut is connected to the switching frame. The output end of the motor drives the screw to rotate through the coupling, so that the screw drives the screw nut to drive the switching frame to reciprocate along the direction of the guide rail.

[0024] As a further description of the above technical solution, the first surface of the optical path frame is connected to the light source and the spectrometer respectively through two short optical fibers.

[0025] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0026] The fixed optical path five-station switching spectrum acquisition system of the present invention can, through the arrangement of the first beam splitter and the second beam splitter, allow the light emitted from one side of the light source to be refracted by the first beam splitter and input into the sampling unit on the second side of the optical path frame, and also to be reflected and directly input into the spectrometer. In combination with a switching frame for shielding the first beam splitter and the sampling unit, and a shielding sheet for shielding the reflection between the first beam splitter and the second beam splitter, the sampling unit is separated from the main body of the station switching device, thereby realizing the switching of multiple stations, avoiding the possibility of corrosion of the station switching device, and having a simple structure and stable operation.

[0027] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a cross-sectional optical path schematic diagram of a fixed optical path five-station switching spectrum acquisition system provided in an embodiment of this specification;

[0030] Figure 2 This is a top view of a fixed optical path five-station switching spectrum acquisition system provided in an embodiment of this specification;

[0031] Figure 3 It is a schematic diagram of a fixed optical path five-station switching spectrum acquisition system provided in an embodiment of this specification;

[0032] Figure 4 It is a top view of the motor part of a fixed optical path five-station switching spectrum acquisition system provided in an embodiment of this specification;

[0033] Figure 5 It is a side view of the motor part of a fixed optical path five-station switching spectrum acquisition system provided in an embodiment of this specification;

[0034] In the figure: 1. light source; 2. spectrometer; 3. sampling unit; 4. station switching device; 41. optical path frame; 42. first beam splitter; 43. second beam splitter; 44. switching frame; 441. shielding plate; 45. motor; 451. coupling; 452. lead screw; 453. lead screw nut; 46. guide rail; 47. slider; 5. first trigger plate; 6. first sensor; 7. second trigger plate; 8. second sensor; 9. short optical fiber. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0036] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual sizes. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0037] It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0038] See also Figure 1-5 , is a fixed optical path five-station switching spectrum acquisition system of this embodiment, wherein the fixed optical path five-station switching spectrum acquisition system includes:

[0039] Light source 1;

[0040] A spectrometer 2, wherein the spectrometer 2 and the light source 1 are arranged in parallel;

[0041] A sampling unit 3, wherein the sampling unit 3 and the light source 1 are arranged opposite to each other, and the sampling unit 3 and the spectrometer 2 are arranged opposite to each other;

[0042] The workstation switching device 4 comprises an optical path frame 41, a first beam splitter 42, a second beam splitter 43, a switching frame 44, and a motor 45. The optical path frame 41 has a first side and a second side that are arranged opposite to each other. The light source 1 and the spectrometer 2 are arranged on the first side of the optical path frame 41, and the sampling unit 3 is arranged on the second side of the optical path frame 41. The first beam splitter 42 is installed on the first side of the optical path frame 41 and is connected to the light source 1. The second beam splitter 43 is installed on the first side of the optical path frame 41 and is connected to the spectrometer 2. The second side of the optical path frame 41 is connected to the sampling unit 3. The switching frame 44 is arranged inside the optical path frame 41. The output end of the motor 45 is connected to the switching frame 44. The motor 45 is used to drive the switching frame 44 to move between the first beam splitter 42 and the sampling unit 3.

[0043] The first beam splitter 42 and the second beam splitter 43 are arranged perpendicular to each other, so that the light emitted from the light source 1 can enter the sampling unit 3 after being refracted by the first beam splitter 42, and be input into the spectrometer 2 through the sampling unit 3, or the light emitted from the light source 1 can be input into the spectrometer 2 after being reflected by the first beam splitter 42 and the second beam splitter 43;

[0044] The switching frame 44 has a plurality of stations arranged at intervals along the moving direction of the switching frame 44, so that when the motor 45 drives the switching frame 44 to move, the light emitted from the light source 1 to the sampling unit 3 can pass through different stations or be blocked;

[0045] A shielding sheet 441 is connected to the switching frame 44, and the shielding sheet 441 is used to shield the light refracted from the first beam splitter 42 to the second beam splitter 43 under the drive of the motor 45;

[0046] The sampling unit 3 is arranged on a side of the station switching device 4 away from the light source 1 and the spectrometer 2 , and the sampling unit 3 is detachably connected to the external sample pool.

[0047] Through the above structure, when in use, the operator only needs to start the motor 45 of the station switching device 4 according to the needs of the current detection station, so that the output end of the motor 45 drives the switching frame 44 and the shielding plate 441 connected to the switching frame 44 to move, so that the switching frame 44 moves between the first beam splitter 42 and the sampling unit 3, and the corresponding station is placed at the optical path position between the first beam splitter 42 and the sampling unit 3 to meet whether the light output by the light source 1 passes through the corresponding station position of the switching frame 44, or is blocked by the switching frame 44. At the same time, the shielding plate 441 is placed or moved away from the position between the first beam splitter 42 and the second beam splitter 43 to meet whether the light output by the light source 1 can be emitted from the first beam splitter 42 to the second beam splitter 43, or is blocked by the shielding plate 441 after being reflected by the first beam splitter 42 and cannot be emitted to the second beam splitter 43. Therefore, based on the above-mentioned control of the optical path of the light, it can be flexibly used in conjunction with multiple stations. Under the switching of the motor, the fixed optical path five-station switching spectrum acquisition system of this embodiment can be switched among different corresponding stations.

[0048] In the above-mentioned use process, the entire switching of the output optical path of the light source 1 occurs in the station switching device 4. Specifically, the sampling unit 3 for placing the sample, such as the corrosive acid solution, is arranged on the second side of the optical path frame 41 in the station switching device 4 and can be connected by a pipeline. That is to say, in this embodiment, the sampling unit 3 is an independent individual compared to the station switching device 4. The station switching device 4 will not be affected by the corrosive sample arranged on one side of the sampling unit 3, which reduces the risk of corrosion of the station switching device 4 and further reduces the maintenance cost of the multi-station device. At the same time, in this embodiment, the switching of the optical path can be achieved by only moving the switching frame 44 and the shielding sheet 441 by a single motor 45, which has better stability and is no more complicated to operate than the spectrometer in the prior art.

[0049] At the same time, the sampling unit 3 is detachably arranged from the external sample pool for placing corrosive samples. The sampling unit 3 acts as an intermediate medium, further isolating the risk that the sample pool may penetrate the core detection structure on the left side through the sampling unit 3, and making the sample pool relatively independent and easy to disassemble and replace.

[0050] Based on the above system structure, the present invention provides the following five usage scenario embodiments, which can be completed in a fixed optical path five-station switching spectrum acquisition system with the same structure.

[0051] External optical path station:

[0052] The switching frame 44 includes an external optical path position. When the motor 45 drives the switching frame 44 to move to the external optical path position, the light refracted by the light source 1 through the first beam splitter 42 completely passes through the switching frame 44 and is input into the spectrometer 2 through the sampling unit 3, and the reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the shielding sheet 441. Based on the above-mentioned movement position of the switching frame 44 and the corresponding position, the system can perform an optical path test at the external optical path position, and the light enters the sampling unit 3 after being refracted by the first beam splitter 42, and is then refracted again from the second beam splitter 43 and input into the spectrometer 2 for analysis.

[0053] Standard sample station:

[0054] The switching frame 44 includes a standard sample station. When the motor 45 drives the switching frame 44 to move to the standard sample station, the light refracted by the light source 1 through the first beam splitter 42 passes through the standard sample station and is input into the spectrometer 2 through the sampling unit 3, and the reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the shielding sheet 441. Based on the above-mentioned movement position of the switching frame 44 and the corresponding station, the system can perform an optical path test at the standard sample position. The light refracts through the first beam splitter 42, penetrates the standard sample, enters the sampling unit 3, and then is refracted from the second beam splitter 43 again and input into the spectrometer 2 for analysis.

[0055] Dark current station:

[0056] The switching frame 44 includes a dark current position. When the motor 45 drives the switching frame 44 to move to the dark current position, the light refracted by the light source 1 through the first beam splitter 42 is completely blocked by the switching plate 44, and the reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the shielding plate 441. Based on the above-mentioned movement position of the switching frame 44 and the corresponding position, no light enters the spectrometer 2.

[0057] Standard sheet station:

[0058] The switching frame 44 includes a standard film position. When the motor 45 drives the switching frame 44 to move to the standard film position, the light refracted by the light source 1 through the first beam splitter 42 passes through the standard film position and is input into the spectrometer 2 through the sampling unit 3, and the reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the shielding sheet 441. Based on the above-mentioned movement position of the switching frame 44 and the corresponding position, the system can perform an optical path test at the standard film position. The light refracted by the first beam splitter 42, penetrated the standard film, entered the sampling unit 3, and then refracted from the second beam splitter 43 again and was input into the spectrometer 2 for analysis.

[0059] Internal reference station:

[0060] The switching frame 44 includes an internal reference station. When the motor 45 drives the switching frame 44 to move to the internal reference station, the light refracted by the light source 1 through the first beam splitter 42 is completely blocked by the switching plate 44, and the reflected light between the first beam splitter 42 and the second beam splitter 43 is connected and input into the spectrometer. Based on the above-mentioned movement position of the switching frame 44 and the corresponding station, the system can perform an optical path test at the internal reference position, and the light is reflected from the first beam splitter 42 to the second beam splitter 43 and then reflected and input into the spectrometer 2 for analysis.

[0061] For further information, see Figure 3 or Figure 4 , a first trigger piece 5 is installed on one side of the switching frame 44, and a first sensor 6 is installed on one side of the motor 45. The first trigger piece 5 and the first sensor 6 are arranged opposite to each other. When the motor 45 drives the switching frame 44 to move to the completely suspended external optical path station, the first trigger piece 5 just triggers the first sensor 6, and the motor 45 stops running. Specifically, with the help of the combination of the first trigger piece 5 and the first sensor 6, at the above-mentioned completely suspended external optical path station, the position of the motor 45 is calibrated to achieve the accuracy of the station movement, and this station can be set to the zero point. When the standard sample station, dark current station, and standard film station need to be positioned in the subsequent process, the motor 45 can be accurately positioned to the zero point first, and then move the preset fixed number of steps, so that the positioning of the standard sample station, dark current station, and standard film station is more accurate.

[0062] For further information, see Figure 4 A second trigger piece 7 is installed on one side of the switching frame 44, and a second sensor 8 is installed on one side of the motor 45. The second trigger piece 7 and the second sensor 8 are arranged opposite to each other. When the motor 45 drives the switching frame to move to the internal reference position that completely blocks the sampling light source 3, the second trigger piece 7 just triggers the second sensor 8, and the motor 45 stops running. Similarly, with the combination of the second trigger piece 7 and the second sensor 8, when the internal reference position of the sampling light source 3 is completely blocked, the position of the motor 45 is calibrated to achieve the accuracy of the position movement.

[0063] It is worth noting that the above-mentioned external optical path station and internal reference station have higher requirements for positioning accuracy, so precise positioning can be achieved through the corresponding trigger sheet and sensor combination.

[0064] For further information, see Figure 3-5The station switching device further includes a guide rail 46, a slider 47, a coupling 451, a lead screw 452, and a lead screw nut 453. The slider 47 is mounted on the guide rail 46, the switching frame 44 is mounted on the slider 47, the lead screw nut 453 is connected to the switching frame 44, and the output end of the motor 45 drives the lead screw 452 to rotate through the coupling 451, so that the lead screw 452 drives the lead screw nut 453 to drive the switching frame 44 to reciprocate along the direction of the guide rail 46. Through the above structure, the switching frame 44 can be driven to perform a stable two-way return motion under the drive of the only motor 45 to achieve the switching of the station.

[0065] Furthermore, the first surface of the optical path frame 41 is respectively connected to the light source 1 and the spectrometer 3 through two short optical fibers 9. Specifically, one end of the short optical fiber 9 is also connected to the through hole at the corresponding position on the first side of the switching frame 44, so that the light output by the light source 1 can be projected at the first beam splitter 42 and the second beam splitter 43 without hindrance, and is refracted and reflected at the same time.

[0066] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the scope of the present invention.

[0067] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0068] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A fixed optical path five-station switching spectrum acquisition system, characterized in that: The fixed optical path five-station switching spectrum acquisition system comprises: light source; A spectrometer, wherein the spectrometer and the light source are arranged in parallel; A sampling unit, wherein the sampling unit and the light source are arranged opposite to each other, and the sampling unit and the spectrometer are arranged opposite to each other; A station switching device, the station switching device comprises an optical path frame, a first beam splitter, a second beam splitter, a switching frame, and a motor, the optical path frame having a first side and a second side arranged opposite to each other, the light source and the spectrometer being arranged on the first side of the optical path frame, the sampling unit being arranged on the second side of the optical path frame, the first beam splitter being mounted on the first side of the optical path frame and connected to the light source, the second beam splitter being mounted on the first side of the optical path frame and connected to the spectrometer, the second side of the optical path frame being connected to the sampling unit, the switching frame being arranged inside the optical path frame, the output end of the motor being connected to the switching frame, and the motor being used to drive the switching frame to move between the first beam splitter and the sampling unit; The first beam splitter and the second beam splitter are arranged perpendicular to each other, so that the light emitted from the light source can enter the sampling unit after being refracted by the first beam splitter, and be input into the spectrometer through the sampling unit, or the light emitted from the light source can be input into the spectrometer after being reflected by the first beam splitter and the second beam splitter; The switching frame has a plurality of stations arranged at intervals along the moving direction of the switching frame, so that when the motor drives the switching frame to move, the light emitted from the light source to the sampling unit can pass through different stations or be blocked; The switching frame is connected with a shielding sheet, and the shielding sheet is used to shield the light refracted from the first beam splitter to the second beam splitter under the drive of the motor; Wherein, the sampling unit is arranged on a side of the station switching device away from the light source and the spectrometer, and the sampling unit is detachably connected to an external sample pool.

2. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The switching frame includes an external optical path position. When the motor drives the switching frame to move to the external optical path position, the light refracted by the light source through the first beam splitter completely passes through the switching frame and is input into the spectrometer via the sampling unit, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding plate.

3. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The switching frame includes a standard sample station. When the motor drives the switching frame to move to the standard sample station, the light refracted by the light source through the first beam splitter passes through the standard sample station and is input into the spectrometer through the sampling unit, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding sheet.

4. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The switching frame includes a dark current position. When the motor drives the switching frame to move to the dark current position, the light refracted by the light source through the first beam splitter is completely blocked by the switching plate, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding plate.

5. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The switching frame includes a standard film station. When the motor drives the switching frame to move to the standard film station, the light refracted by the light source through the first beam splitter passes through the standard film station and is input into the spectrometer through the sampling unit, and the reflected light between the first beam splitter and the second beam splitter is blocked by the shielding sheet.

6. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The switching frame includes an internal reference station. When the motor drives the switching frame to move to the internal reference station, the light refracted by the light source through the first beam splitter is completely blocked by the switching plate, and the reflected light between the first beam splitter and the second beam splitter is connected and input into the spectrometer.

7. The fixed optical path five-station switching spectrum acquisition system according to claim 2, characterized in that: A first trigger piece is installed on one side of the switching frame, and a first sensor is installed on one side of the motor. The first trigger piece is arranged opposite to the first sensor. When the motor drives the switching frame to move to the completely suspended external optical path position, the first trigger piece just triggers the first sensor, and the motor stops running.

8. The fixed optical path five-station switching spectrum acquisition system according to claim 6, characterized in that: A second trigger piece is installed on one side of the switching frame, and a second sensor is installed on one side of the motor. The second trigger piece is arranged opposite to the second sensor. When the motor drives the switching frame to move to the internal reference position that completely blocks the sampling light source, the second trigger piece just triggers the second sensor, and the motor stops running.

9. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The workstation switching device also includes a guide rail, a slider, a coupling, a lead screw, and a lead screw nut. The slider is installed on the guide rail, the switching frame is installed on the slider, and the lead screw nut is connected to the switching frame. The output end of the motor drives the lead screw to rotate through the coupling, and the lead screw drives the lead screw nut to drive the switching frame to reciprocate along the direction of the guide rail.

10. The fixed optical path five-station switching spectrum acquisition system according to claim 1, characterized in that: The first surface of the optical path frame is connected to the light source and the spectrometer respectively through two short optical fibers.

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