A fixed optical path five-position switching spectral acquisition system

Abstract

This invention relates to a testing instrument, and more particularly to a fixed optical path five-position switching spectral acquisition system, comprising: a light source, a spectrometer, and a sampling unit; a position switching device, which includes an optical path frame, a first beam splitter, a second beam splitter, a switching frame, and a motor. The light source and spectrometer are disposed on the first side of the optical path frame, and the sampling unit is disposed on the second side of the optical path frame. The motor drives the switching frame to move between the first beam splitter and the sampling unit. The first and second beam splitters are arranged perpendicularly to each other, so that light emitted from the light source can enter the sampling unit after refraction by the first beam splitter and be input to the spectrometer through the sampling unit, or light emitted from the light source can be input to the spectrometer after reflection by the first and second beam splitters. The switching frame has multiple positions, and a shielding plate is connected to the switching frame. This invention separates the sampling unit used to connect the sample cell from the position switching device, avoiding corrosion.

Description

Technical Field

[0001] This invention relates to a testing instrument, and more particularly to a fixed optical path five-position switching spectral acquisition system. Background Technology

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

[0003] Most existing near-infrared spectrometers adopt a layout where the spectrometer and the light source face each other. In this layout, the light emitted by the light source passes through the sample or standard sheet and then enters the spectrometer. A movable component is set between the light source and the spectrometer. The movable component has four positions: sample position, reference position, standard sheet position, and dark current position. By moving the movable component laterally, the spectrometer can switch between acquiring the sample spectrum, acquiring the reference spectrum, acquiring the dark current, and acquiring the standard sample.

[0004] In the above structure, the sample is directly collected within the switching assembly where the moving parts are located. Therefore, in acidic environments, for example, the switching assembly is easily corroded and cannot meet the operating requirements.

[0005] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0006] The purpose of this invention is to provide a fixed optical path five-position switching spectral acquisition system, which, through the setting of the first and second beam splitters, allows the sampling unit used to connect the sample cell to be separated from the position switching device, thus avoiding the possibility of corrosion of the position switching device.

[0007] To achieve the above objectives, the present invention discloses a fixed optical path five-position switching spectral acquisition system, the fixed optical path five-position switching spectral acquisition system comprising:

[0008] light source;

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

[0010] A sampling unit is provided, which is disposed opposite to the light source and opposite to the spectrometer;

[0011] A workstation switching device includes an optical path frame, a first beam splitter, a second beam splitter, a switching frame, and a motor. The optical path frame has a first side and a second side arranged opposite to each other. The light source and the spectrometer are disposed on the first side of the optical path frame, and the sampling unit is disposed on the second side of the optical path frame. The first beam splitter is mounted on the first side of the optical path frame and connected to the light source. The second beam splitter is mounted on the first side of the optical path frame and connected to the spectrometer. The second side of the optical path frame is connected to the sampling unit. The switching frame is disposed inside the optical path frame. The output end of the motor is connected to the switching frame, and the motor is 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 perpendicularly 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 then 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 multiple workstations spaced apart 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 workstations or be blocked.

[0014] A blocking plate is connected to the switching frame. The blocking plate is used to block the light that will be refracted from the first beam splitter to the second beam splitter under the drive of the motor.

[0015] The sampling unit is located on the side of the workstation switching device away from the light source and the spectrometer, and the sampling unit is detachably connected to the external sample cell.

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

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

[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. 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 plate is installed on one side of the switching frame, and a first sensor is installed on the side of the motor. The first trigger plate and the first sensor are arranged opposite to each other. When the motor drives the switching frame to move to the completely suspended external optical path station, the first trigger plate just triggers the first sensor, and the motor stops running.

[0022] As a further description of the above technical solution, a second trigger plate is installed on one side of the switching frame, and a second sensor is installed on the side of the motor. The second trigger plate and the second sensor are arranged opposite to each other. When the motor drives the switching frame to move to the internal reference station that completely blocks the sampling light source, the second trigger plate 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 lead screw, and a lead screw nut. The slider is mounted on the guide rail, the switching frame is mounted 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, so that the lead screw drives the lead 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 via two short optical fibers.

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

[0026] The fixed optical path five-position switching spectral acquisition system of the present invention, through the setting of the first beam splitter and the second beam splitter, allows 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, or reflected and directly input into the spectrometer. Combined with the switching frame used to shield the first beam splitter and the sampling unit, and the shielding plate used to shield the reflection between the first beam splitter and the second beam splitter, multiple positions can be switched while the sampling unit is separated from the main body of the position switching device. This avoids the possibility of corrosion of the position switching device, and the structure is simple and the operation is stable.

[0027] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional optical path schematic diagram of a fixed optical path five-position switching spectral acquisition system provided in the embodiments of this specification;

[0030] Figure 2 This is a top view of a fixed optical path five-position switching spectral acquisition system provided in the embodiments of this specification;

[0031] Figure 3 This is a cross-sectional schematic diagram of a fixed optical path five-position switching spectral acquisition system provided in the embodiments of this specification;

[0032] Figure 4 This is a top view of the motor portion of a fixed optical path five-position switching spectral acquisition system provided in the embodiments of this specification;

[0033] Figure 5 This is a side view of the motor portion of a fixed optical path five-position switching spectral acquisition system provided in the embodiments of this specification;

[0034] In the diagram: 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 Implementation

[0035] 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 with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0036] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0037] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0038] Please see Figure 1-5 This embodiment provides a fixed optical path five-position switching spectral acquisition system, which includes:

[0039] Light source 1;

[0040] Spectrometer 2 is arranged in parallel with light source 1;

[0041] Sampling unit 3 is arranged opposite to light source 1, and sampling unit 3 is arranged opposite to spectrometer 2;

[0042] The workstation switching device 4 includes 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 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 connected to the light source 1. The second beam splitter 43 is installed on the first side of the optical path frame 41 and 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 perpendicularly 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 then 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 multiple workstations spaced apart 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 workstations or be blocked.

[0045] A blocking plate 441 is connected to the switching frame 44. The blocking plate 441 is used to block the light that will be 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 located on the side of the workstation 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 cell.

[0047] With the above structure, during use, the operator only needs to start the motor 45 of the station switching device 4 according to the current testing station requirements. This causes the output end of the motor 45 to drive 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. This satisfies whether the light output from 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, so that the light output from the light source 1 can be emitted from the first beam splitter 42 to the second beam splitter 43, or after being reflected by the first beam splitter 42, it is blocked by the shielding plate 441 and cannot be emitted to the second beam splitter 43. Therefore, based on the above-mentioned optical path control of light, it can be used flexibly with multiple workstations. With the switching of motors, the fixed optical path five-workstation switching spectral acquisition system of this embodiment can switch between different corresponding workstations.

[0048] In the above-described process, the entire switching of the output optical path of the light source 1 takes place in the station switching device 4. Specifically, the sampling unit 3, used to place the sample to be sampled, such as corrosive acid, is located 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 entity compared to the station switching device 4. The station switching device 4 is not affected by the corrosive sample to be sampled placed on one side of the sampling unit 3, reducing the risk of corrosion of the station switching device 4 and further reducing the maintenance cost of the multi-station device. At the same time, in this embodiment, the switching of the optical path only requires a single motor 45 to move the switching frame 44 and the shielding plate 441, which has better stability and is no more cumbersome to operate compared with existing spectrometers.

[0049] Meanwhile, the sampling unit 3 is detachably connected to the external sample cell for placing corrosive samples. As an intermediate medium, the sampling unit 3 further isolates the risk of the sample cell potentially penetrating into the core detection structure on the left through the sampling unit 3, and makes the sample cell more independent, easy to disassemble and replace.

[0050] Based on the above system structure, the present invention provides the following five application scenarios, which can be completed in a fixed optical path five-position switching spectral acquisition system with the same structure.

[0051] External optical path station:

[0052] The switching frame 44 includes an external optical path station. When the motor 45 drives the switching frame 44 to move to the external optical path station, 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 via the sampling unit 3. The reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the blocking plate 441. Based on the aforementioned movement position of the switching frame 44 and the corresponding station, the system can perform optical path tests at the external optical path position. The light enters the sampling unit 3 after being refracted by the first beam splitter 42, and is then refracted again by the second beam splitter 43 before being 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 via the sampling unit 3. The reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the blocking plate 441. Based on the aforementioned movement position of the switching frame 44 and the corresponding station, the system can perform optical path tests at the standard sample position. The light is refracted by the first beam splitter 42, passes through the standard sample, enters the sampling unit 3, and is then refracted again by the second beam splitter 43 before being input into the spectrometer 2 for analysis.

[0055] Dark current station:

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

[0057] Standard film workstation:

[0058] The switching frame 44 includes a standard plate station. When the motor 45 drives the switching frame 44 to move to the standard plate station, the light refracted by the light source 1 through the first beam splitter 42 passes through the standard plate station and is input into the spectrometer 2 via the sampling unit 3. The reflected light between the first beam splitter 42 and the second beam splitter 43 is blocked by the blocking plate 441. Based on the above-mentioned movement position of the switching frame 44 and the corresponding station, the system can perform optical path tests on the standard plate position. The light is refracted by the first beam splitter 42, passes through the standard plate, enters the sampling unit 3, and is then refracted again by the second beam splitter 43 before being input into the spectrometer 2 for analysis.

[0059] Internal reference workstations:

[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 frame 44. 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 aforementioned movement position of the switching frame 44 and the corresponding station, the system can perform optical path tests at the internal reference position. The light is reflected by the first beam splitter 42 to the second beam splitter 43 and then reflected again before being input into the spectrometer 2 for analysis.

[0061] Further, please see Figure 3 or Figure 4 A first trigger plate 5 is installed on one side of the switching frame 44, and a first sensor 6 is installed on the other side of the motor 45. The first trigger plate 5 and the first sensor 6 are positioned opposite each other. When the motor 45 drives the switching frame 44 to move to the completely suspended external optical path station, the first trigger plate 5 triggers the first sensor 6, and the motor 45 stops running. Specifically, by using the combination of the first trigger plate 5 and the first sensor 6, the position of the motor 45 is calibrated at the completely suspended external optical path station, achieving accuracy in station movement. This station can be set as the zero point. When it is necessary to position the standard sample station, dark current station, and standard sheet station in the future, the motor 45 can first accurately position itself to the zero point, and then move a preset fixed number of steps, making the positioning of the standard sample station, dark current station, and standard sheet station more accurate.

[0062] Further, please see Figure 4 A second trigger plate 7 is installed on one side of the switching frame 44, and a second sensor 8 is installed on the other side of the motor 45. The second trigger plate 7 and the second sensor 8 are positioned opposite 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 plate 7 triggers the second sensor 8, and the motor 45 stops running. Similarly, by using the combination of the second trigger plate 7 and the second sensor 8, the position of the motor 45 is calibrated when the sampling light source 3 is completely blocked, thus achieving accurate position movement.

[0063] It is worth noting that the external optical path station and the internal reference station mentioned above have higher requirements for positioning accuracy. Therefore, precise positioning can be achieved by using corresponding trigger plates and sensor combinations.

[0064] Further, please see Figure 3-5The workstation switching device also 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, and the switching frame 44 is mounted on the slider 47. The lead screw nut 453 is connected to the switching frame 44. The output end of the motor 45 drives the lead screw 452 to rotate through the coupling 451, which in turn drives the lead screw nut 453 to drive the switching frame 44 to reciprocate along the direction of the guide rail 46. With the above structure, the switching frame 44 can be driven by a single motor 45 to perform a stable bidirectional reciprocating motion, thereby realizing the switching of workstations.

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

[0066] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention.

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

[0068] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A fixed optical path five-position switching spectral acquisition system, characterized in that, The fixed optical path five-position switching spectral acquisition system includes: light source; A spectrometer, wherein the spectrometer and the light source are arranged in parallel; A sampling unit is provided, which is disposed opposite to the light source and opposite to the spectrometer; A workstation switching device includes an optical path frame, a first beam splitter, a second beam splitter, a switching frame, and a motor. The optical path frame has a first side and a second side arranged opposite to each other. The light source and the spectrometer are disposed on the first side of the optical path frame, and the sampling unit is disposed on the second side of the optical path frame. The first beam splitter is mounted on the first side of the optical path frame and connected to the light source. The second beam splitter is mounted on the first side of the optical path frame and connected to the spectrometer. The second side of the optical path frame is connected to the sampling unit. The switching frame is disposed inside the optical path frame. The output end of the motor is connected to the switching frame, and the motor is 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 perpendicularly 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 then 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 multiple workstations spaced apart 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 workstations or be blocked. A blocking plate is connected to the switching frame. The blocking plate is used to block the light reflected from the first beam splitter to the second beam splitter under the drive of the motor. The sampling unit is located on the side of the workstation switching device away from the light source and the spectrometer, and the sampling unit is detachably connected to the external sample cell.

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

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

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

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

9. The fixed optical path five-position switching spectral 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 mounted on the guide rail, the switching frame is mounted 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, so that 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-position switching spectral 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 via two short optical fibers, respectively.

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