Optical filter switching device for spectrograph and spectrograph

Abstract

The invention discloses an optical filter switching device for a spectrograph, and belongs to the technical field of spectrographs. An optical filter seat and a flange connecting seat in the switching device are both in threaded transmission connection with a lead screw shaft, namely, the back-and-forth movement positioning precision is improved by adopting a double-nut clearance elimination means, and the value and the competition of products are further improved. In addition, the gap eliminating mechanism is in transmission connection with the flange connecting seat and the optical filter seat to drive the optical filter seat and the flange connecting seat to move oppositely, so that the screw-thread fit gap between the optical filter seat and the flange connecting seat and the screw rod shaft is gradually reduced. Therefore, the axial clearance generated by long-term working abrasion of the lead screw nut pair can be eliminated, and the requirements for eliminating the clearance and improving the transmission precision are met. The device also has the advantages of compact structure, easiness in operation, long service life, low cost and the like, has a good market application prospect, can be flexibly integrated in different spectrometers, and has a wide application range for the spectrometers.

Description

Technical Field

[0001] This application relates to the field of spectrometer technology, and in particular to a filter switching device for a spectrometer. Background Technology

[0002] In ultra-wide-range infrared grating spectrometers, filters must be precisely aligned with the center of the optical path to avoid signal attenuation or errors caused by optical axis misalignment. Filter switching devices can significantly improve the measurement accuracy and flexibility of ultra-wide-range infrared spectrometers. Their function is to dynamically select filters of different wavelengths to adapt to the needs of wide-spectrum measurements, while optimizing signal-to-noise ratio, resolution, and detection efficiency.

[0003] However, the use of lead screw motors as drive devices in current filter switching devices typically presents at least one of the following problems:

[0004] (1) The mechanical backlash of the lead screw and nut assembly (usually 0.01 to 0.1 mm) can cause a mismatch between the actual displacement of the stepper motor and the number of command pulses. For example, if the filter needs to be moved precisely within ±0.05 mm, the gap may introduce errors, causing the filter to deviate from the center of the optical path, reducing the spectral resolution or signal-to-noise ratio.

[0005] (2) Poor repeatability, the switching device needs to move back and forth frequently (possibly thousands of times a day). When the gap exists, the starting point of the forward and reverse movements is different, causing the filter position to shift each time, which cannot be repeated and requires repeated calibration.

[0006] (3) The gap will cause mechanical shock (especially during high-speed switching), accelerate the wear of the lead screw and nut, shorten the life, and the vibration may interfere with the sensitive optical components of the spectrometer. Summary of the Invention

[0007] This application provides a filter switching device for a spectrometer and a spectrometer. It solves the problem of unstable transmission caused by lead screw shaft backlash in existing filter switching devices. The technical solution is as follows:

[0008] On one hand, a filter switching device for a spectrometer is provided, the filter switching device for a spectrometer comprising:

[0009] Drive motor, filter holder, flange connection seat and gap elimination mechanism;

[0010] The drive motor has a lead screw shaft extending along a first direction;

[0011] The filter holder is sleeved on the lead screw shaft and is connected to the lead screw shaft for transmission. The filter has a plurality of filter holes arranged along the first direction.

[0012] The flange connector is located on the side of the filter holder away from the drive motor, and the flange connector is sleeved on the lead screw shaft and is connected to the lead screw shaft in a transmission manner.

[0013] At least a portion of the gap elimination mechanism is located on the side of the flange connector opposite to the filter holder and is kinetically connected to both the flange connector and the filter holder. The gap elimination mechanism is configured to drive the filter holder and the flange connector to move in opposite directions to eliminate the threaded fit gap between the filter holder and the flange connector and the lead screw shaft.

[0014] Optionally, the filter holder has a locking hole on the side away from the drive motor, and the flange connecting seat has a through hole communicating with the locking hole; the gap elimination mechanism includes: a locking member and an elastic pre-tightening member, the first end of the locking member passes through the through hole and is locked to the locking hole, and the second end of the locking member abuts against the side of the flange connecting seat away from the filter holder;

[0015] The elastic pretensioner is sleeved on the locking member and located between the flange connecting seat and the filter seat on the side away from the drive motor, and the two sides of the elastic pretensioner abut against the flange connecting seat and the filter seat respectively.

[0016] Optionally, the flange connecting seat has a transmission locking hole; the gap elimination mechanism includes: a transmission abutment and a fixing member that are threadedly engaged with the transmission locking hole, the first end of the transmission abutment passes through the transmission locking hole and abuts against the side of the filter seat away from the drive motor, and the second end of the transmission abutment is located on the side of the flange connecting seat away from the filter seat.

[0017] Wherein, after the first end of the transmission abutment abuts against the side of the filter seat away from the drive motor, the fixing member is fastened to the flange connecting seat and the transmission abutment respectively.

[0018] Optionally, the fastener includes: an adhesive that is bonded to the bore wall of the flange connecting seat and the outer wall of the transmission abutment respectively, and / or an auxiliary elastic pre-tightening member that is sleeved on the transmission abutment and fixed to the second end of the transmission abutment and the side of the flange connecting seat away from the filter seat.

[0019] Optionally, the filter holder has a positioning hole; the flange connection seat includes: a flange and a positioning sleeve connected to each other, the positioning sleeve is located in the positioning hole and coaxially arranged with the positioning hole and is connected to the lead screw shaft for transmission, and the flange is located on the side of the filter holder away from the drive motor.

[0020] Optionally, the filter switching device for the spectrometer further includes: a photoelectric sensor, an origin sensing element, and a controller. The photoelectric sensor is located on one side of the end of the lead screw shaft, and the origin sensing element is fixed to the end of the filter holder near the photoelectric sensor and cooperates with the photoelectric sensor. The photoelectric sensor and the drive motor are both electrically connected to the controller.

[0021] The controller is used to control the drive motor to move the filter holder to the origin point, where the sensing sheet cooperates with the photoelectric sensor and records the actual number of pulses of the drive motor. The controller is also used to compare the actual number of pulses with the preset number of pulses to obtain a pulse compensation value for pulse compensation of the drive motor.

[0022] Optionally, the filter switching device for the spectrometer further includes a housing, wherein the drive motor and the filter holder are both located within the housing.

[0023] Optionally, the bottom of the housing has a strip-shaped slide rail extending along the first direction, and the bottom of the filter holder has a sliding groove that slides in cooperation with the strip-shaped slide rail.

[0024] On the other hand, a spectrometer is provided, the spectrometer comprising: a laser and a filter switching device for the spectrometer, wherein a beam emitted by the laser is guided to filters within a plurality of filter apertures, and the filter switching device for the spectrometer is any of the spectrometer filter switching devices given above.

[0025] Optionally, the spectrometer may include a Raman spectrometer or a micro spectrometer.

[0026] The beneficial effects of the technical solutions provided in this application include at least the following:

[0027] The filter holder and flange connector in the switching device are both threadedly connected to the lead screw shaft, employing a double-nut backlash elimination method to improve the positioning accuracy of the reciprocating movement, thus enhancing the product's value and competitiveness. Furthermore, the backlash elimination mechanism is also connected to both the flange connector and the filter holder, causing them to move in opposite directions, gradually reducing the backlash between the filter holder / flange connector and the lead screw shaft thread. This eliminates the axial backlash caused by long-term wear of the lead screw and nut pair, achieving the requirement of backlash elimination and improved transmission accuracy. This device also boasts advantages such as compact structure, ease of operation, long lifespan, and low cost, offering excellent market application prospects. It can be flexibly integrated into different spectrometers, making it suitable for a wide range of spectrometer applications. During filter switching, it ensures the alignment of the filter's optical path center and effectively guarantees a relatively accurate target stopping position of the filter after multiple reciprocating movements, eliminating the need for repeated calibration. Attached Figure Description

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

[0029] Figure 1 This is a top view of a filter switching device for a spectrometer provided in an embodiment of this application;

[0030] Figure 2 yes Figure 1 A partial structural schematic diagram of a filter switching device for a spectrometer is shown.

[0031] Figure 3 yes Figure 1 Sectional view at A-A';

[0032] Figure 4 This is a partial structural schematic diagram of another filter switching device for a spectrometer provided in an embodiment of this application;

[0033] Figure 5 yes Figure 4 An exploded schematic diagram of the switching device is shown.

[0034] Figure 6 This is a partial structural schematic diagram of another switching device provided in the embodiments of this application;

[0035] Figure 7 This is a cross-sectional view of a switching device provided in an embodiment of this application;

[0036] Figure 8 This is an exploded view of a switching device provided in an embodiment of this application.

[0037] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0041] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a top view of a filter switching device for a spectrometer provided in an embodiment of this application. Figure 2 yes Figure 1 The diagram shown is a partial structural schematic of the filter switching device for a spectrometer. Figure 3 yes Figure 1 A cross-sectional view at A-A'. The filter switching device for the spectrometer may include: a drive motor 100, a filter holder 200, a flange connection seat 300, and a gap elimination mechanism 400.

[0042] The drive motor 100 may have a lead screw shaft 101 extending along a first direction f. The drive motor 100 may be a lead screw linear stepper motor.

[0043] The filter holder 200 is sleeved on the lead screw shaft 101 of the drive motor 100 and is drively connected to the lead screw shaft 101. The filter holder 200 has a plurality of filter holes 201 arranged along a first direction f. Here, the plurality of filter holes 201 can be used to install filters.

[0044] The flange connector 300 is located on the side of the filter holder 200 away from the drive motor 100. The flange connector 300 is sleeved on the lead screw shaft 101 of the drive motor 100 and is connected to the lead screw shaft 101 for transmission.

[0045] At least a portion of the gap elimination mechanism 400 is located on the side of the flange connection seat 300 away from the filter seat 200, and is kinetically connected to the flange connection seat 300 and the filter seat 200 respectively. The gap elimination mechanism 400 is configured to drive the filter seat 200 and the flange connection seat 300 to move in opposite directions to eliminate the threaded fit gap between the filter seat 200 and the flange connection seat 300 and the lead screw shaft 101.

[0046] In this embodiment, both the filter holder 200 and the flange connecting seat 300 in the switching device are threadedly connected to the lead screw shaft 101. This employs a double-nut backlash elimination method to improve the positioning accuracy of the reciprocating movement, further enhancing the product's value and competitiveness. Furthermore, the backlash elimination mechanism 400 is threadedly connected to both the flange connecting seat 300 and the filter holder 200, causing them to move in opposite directions. This gradually reduces the gap between the filter holder 200 and the flange connecting seat 300 and the threaded engagement with the lead screw shaft 101. This eliminates the axial backlash caused by long-term wear of the lead screw and nut pair, achieving the requirement of backlash elimination and improved transmission accuracy. This device also boasts advantages such as compact structure, ease of operation, long lifespan, and low cost, offering excellent market application prospects. It can be flexibly integrated into different spectrometers, making it applicable to a wide range of spectrometers. During filter switching, it ensures the alignment of the filter's optical path center and effectively guarantees a relatively accurate target stopping position of the filter after multiple reciprocating movements, eliminating the need for repeated calibration.

[0047] In summary, this application provides a filter switching device for a spectrometer, which may include: a drive motor 100, a filter holder 200, a flange connecting seat 300, and a gap elimination mechanism 400. Both the filter holder 200 and the flange connecting seat 300 in the switching device are threadedly connected to the lead screw shaft 101, meaning that a double-nut backlash elimination method is used to improve the positioning accuracy of the back-and-forth movement, further enhancing the product's value and competitiveness. Furthermore, the gap elimination mechanism 400 is driven by both the flange connecting seat 300 and the filter holder 200, causing the filter holder 200 and the flange connecting seat 300 to move synchronously in opposite directions, gradually reducing the gap between the threaded fit between the filter holder 200 and the flange connecting seat 300 and the lead screw shaft 101. This eliminates the axial backlash caused by long-term wear of the lead screw and nut pair, achieving the requirement of backlash elimination and improved transmission accuracy. This device also boasts advantages such as compact structure, ease of operation, long lifespan, and low cost, making it a promising candidate for market applications. It can be flexibly integrated into various spectrometers, thus having a wide range of applicability. During filter switching, it ensures the alignment of the filter's optical path center and effectively guarantees a relatively accurate target stopping position of the filter after multiple reciprocating movements, eliminating the need for repeated calibration.

[0048] Optionally, there are multiple possible implementations of the gap elimination mechanism 400 in this application embodiment. The following is an illustrative description of two possible implementations:

[0049] For the first optional implementation method, please refer to... Figure 4 and Figure 5 , Figure 4This is a partial structural schematic diagram of another filter switching device for a spectrometer provided in an embodiment of this application. Figure 5 yes Figure 4 An exploded view of the switching device is shown. The filter holder 200 has a locking hole 202 on the side opposite to the drive motor 100, and the flange connection seat 300 has a through hole 301 communicating with the locking hole 202; the gap elimination mechanism 400 includes a locking member 401 and an elastic pre-tightening member 402. The first end of the locking member 401 passes through the through hole 301 and is locked to the locking hole 202, and the second end of the locking member 401 abuts against the side of the flange connection seat 300 opposite to the filter holder 200.

[0050] The elastic preload 402 is sleeved on the locking member 401 and located between the flange connecting seat 300 and the filter seat 200 on the side away from the drive motor 100, with both sides of the elastic preload 402 abutting against the flange connecting seat 300 and the filter seat 200 respectively. In this case, the locking member 401 is locked with the locking hole 202 of the filter seat 200, and its first end is screwed into the filter seat 200 through a thread, causing the gap between the thread of the filter seat 200 and the thread of the lead screw shaft 101 to gradually decrease. At the same time, the tightness of the locking member 401 is controlled to control the elastic force and deformation displacement of the elastic preload 402, thereby controlling and adjusting the preload and axial displacement of the flange connecting seat 300, achieving the purpose of eliminating the gap of the lead screw and nut pair. Here, the elastic preload 402 may include: spring washers, O-rings, and butterfly washers, etc.

[0051] For example, there can be multiple locking holes 202, which are distributed around the filter holder 200 along its axial direction. There can also be multiple through holes 301, which are connected to the multiple locking holes 202 in a one-to-one correspondence.

[0052] For the second optional implementation method, please refer to... Figure 6 and Figure 7 , Figure 6 This is a partial structural schematic diagram of another switching device provided in an embodiment of this application. Figure 7 This is a cross-sectional view of a switching device provided in an embodiment of this application. The flange connecting seat 300 has a transmission locking hole 302; the gap elimination mechanism 400 includes: a transmission abutment 403 and a fixing member 404 that are threadedly engaged with the transmission locking hole 302. The first end of the transmission abutment 403 passes through the transmission locking hole 302 and abuts against the side of the filter holder 200 away from the drive motor 100, and the second end of the transmission abutment 403 is located on the side of the flange connecting seat 300 away from the filter holder 200;

[0053] In this configuration, after the first end of the transmission abutment 403 abuts against the side of the filter holder 200 away from the drive motor 100, the fixing member 404 is securely connected to both the flange connecting seat 300 and the transmission abutment 403. In this situation, tightening the transmission abutment 403 causes its first end to abut against the filter holder 200, gradually reducing the gap between the threads of the filter holder 200 and the lead screw shaft 101. Simultaneously, during the rotation of the transmission abutment 403, it engages with the transmission locking hole 302 of the flange connecting seat 300, causing the flange connecting seat 300 to move away from the filter holder 200, further reducing the gap between the threads of the flange connecting seat 300 and the lead screw shaft 101.

[0054] In this application, the fastener 404 may include: an adhesive that is bonded to the bore wall of the flange connecting seat 300 and the outer wall of the transmission abutment 403 respectively, and / or an auxiliary elastic preload that is sleeved on the transmission abutment 403 and fixed to the second end of the transmission abutment 403 and the side of the flange connecting seat 300 opposite to the filter holder 200. This auxiliary elastic preload may be a coil spring.

[0055] Optional, such as Figure 7 As shown, the filter holder 200 has a positioning hole, and the flange connection seat 300 includes a flange 310 and a positioning sleeve 320 connected to each other. The positioning sleeve 320 is located within the positioning hole, coaxially arranged with the positioning hole, and is drively connected to the lead screw shaft 101. The flange 310 is located on the side of the filter holder 200 opposite to the drive motor 100. The flange connection seat 300, through the cooperation between the positioning sleeve 320 and the positioning hole in the filter, ensures the installation accuracy of both, thereby improving the transmission accuracy of the lead screw shaft 101 to the filter holder 200.

[0056] Here, the flange 310 may be provided with a through hole 301, or a transmission locking hole 302.

[0057] In the embodiments of this application, such as Figure 7 As shown, the filter switching device for the spectrometer may further include: a photoelectric sensor 500, a origin sensing element 600, and a controller (not shown in the figure). The photoelectric sensor 500 is located on one side of the end of the lead screw shaft 101, and the origin sensing element 600 is fixed to the end of the filter holder 200 near the photoelectric sensor 500 and cooperates with the photoelectric sensor 500. The photoelectric sensor 500 and the drive motor 100 are both electrically connected to the controller.

[0058] The controller is used to control the drive motor 100 to move the filter holder 200 to the origin, where the sensing sheet 600 cooperates with the photoelectric sensor 500 and records the actual number of pulses of the drive motor 100. The controller is also used to compare the actual number of pulses with the preset number of pulses to obtain a pulse compensation value for pulse compensation of the drive motor 100.

[0059] For example, such as Figure 7 As shown, assuming the photoelectric sensor 500 is at position 0, the right end of the lead screw shaft 101 of the drive motor 100 is at position 1 (start / end position). Each power-on self-test moves from position 1 to position 0. The controller compares the actual pulse count with the preset pulse count. If the pulse count changes, this change can be set as a compensation value. For example, the first filter hole 201 on the left side of the filter holder 200 is at pulse count 300, the second at pulse count 1000, and the fifth at pulse count 3000. If mechanical wear, pre-tightening, or other issues cause problems, the controller adds a certain compensation value to the pulse count of the drive motor 100 to move the filter holder 200 left or right.

[0060] Optional, such as Figure 7 As shown, the filter switching device for the spectrometer may also include: a sensor bracket 800, on which the photoelectric sensor 500 can be fixed.

[0061] In the embodiments of this application, such as Figure 7 The filter switching device for the spectrometer shown may further include: a housing 700, a drive motor 100, and a filter holder 200, all located within the housing 700. In this way, the housing 700 supports and protects multiple components. Here, the sensor bracket can also be housed within the housing 700.

[0062] Please refer to the following in this application: Figure 7 and Figure 8 , Figure 8 This is an exploded view of a switching device provided in an embodiment of this application. The bottom of the housing 700 has a strip-shaped slide rail 701 extending along a first direction f, and the bottom of the filter holder 200 has a sliding groove C that slides in cooperation with the strip-shaped slide rail 701. In this way, the cooperation between the strip-shaped slide rail 701 and the sliding groove further ensures the stability and accuracy of the movement of the filter holder 200.

[0063] In summary, this application provides a filter switching device for a spectrometer, which may include: a drive motor 100, a filter holder 200, a flange connecting seat 300, and a gap elimination mechanism 400. Both the filter holder 200 and the flange connecting seat 300 in the switching device are threadedly connected to the lead screw shaft 101, meaning that a double-nut backlash elimination method is used to improve the positioning accuracy of the back-and-forth movement, further enhancing the product's value and competitiveness. Furthermore, the gap elimination mechanism 400 is driven by both the flange connecting seat 300 and the filter holder 200, causing the filter holder 200 and the flange connecting seat 300 to move in opposite directions, gradually reducing the gap between the threaded engagement of the filter holder 200 and the flange connecting seat 300 and the lead screw shaft 101. This eliminates the axial backlash caused by long-term wear of the lead screw and nut pair, achieving the requirement of backlash elimination and improved transmission accuracy. This device also boasts advantages such as compact structure, ease of operation, long lifespan, and low cost, making it a promising candidate for market applications. It can be flexibly integrated into various spectrometers, thus having a wide range of applicability. During filter switching, it ensures the alignment of the filter's optical path center and effectively guarantees a relatively accurate target stopping position of the filter after multiple reciprocating movements, eliminating the need for repeated calibration.

[0064] This application embodiment also provides a spectrometer, which may include: a laser (not shown in the figure) and a filter switching device for the spectrometer, wherein the light beam emitted by the laser can be guided to filters in a plurality of filter holes 201.

[0065] For example, the spectrometer may include a Raman spectrometer or a miniature spectrometer.

[0066] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0067] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A filter switching device for a spectrometer, characterized in that, include: Drive motor, filter holder, flange connection seat and gap elimination mechanism; The drive motor has a lead screw shaft extending along a first direction; The filter holder is sleeved on the lead screw shaft and is connected to the lead screw shaft for transmission. The filter has a plurality of filter holes arranged along the first direction. The flange connector is located on the side of the filter holder away from the drive motor, and the flange connector is sleeved on the lead screw shaft and is connected to the lead screw shaft in a transmission manner. At least a portion of the gap elimination mechanism is located on the side of the flange connector opposite to the filter holder and is kinetically connected to both the flange connector and the filter holder. The gap elimination mechanism is configured to drive the filter holder and the flange connector to move in opposite directions to eliminate the threaded fit gap between the filter holder and the flange connector and the lead screw shaft.

2. The filter switching device for a spectrometer according to claim 1, characterized in that, The filter holder has a locking hole on the side away from the drive motor, and the flange connecting seat has a through hole communicating with the locking hole; the gap elimination mechanism includes a locking member and an elastic pre-tightening member, the first end of the locking member passes through the through hole and is locked to the locking hole, and the second end of the locking member abuts against the side of the flange connecting seat away from the filter holder; The elastic pretensioner is sleeved on the locking member and located between the flange connecting seat and the filter seat on the side away from the drive motor, and the two sides of the elastic pretensioner abut against the flange connecting seat and the filter seat respectively.

3. The filter switching device for a spectrometer according to claim 1, characterized in that, The flange connecting seat has a transmission locking hole; the gap elimination mechanism includes: a transmission abutment and a fixing member that are threadedly engaged with the transmission locking hole, the first end of the transmission abutment passes through the transmission locking hole and abuts against the side of the filter seat away from the drive motor, and the second end of the transmission abutment is located on the side of the flange connecting seat away from the filter seat. Wherein, after the first end of the transmission abutment abuts against the side of the filter seat away from the drive motor, the fixing member is fastened to the flange connecting seat and the transmission abutment respectively.

4. The filter switching device for a spectrometer according to claim 3, characterized in that, The fasteners include: adhesives that are bonded and fixed to the bore wall of the flange connecting seat and the outer side wall of the transmission abutment respectively, and / or auxiliary elastic pre-tightening members that are sleeved on the transmission abutment and fixed to the second end of the transmission abutment and the side of the flange connecting seat away from the filter seat.

5. The filter switching device for a spectrometer according to any one of claims 1-4, characterized in that, The filter holder has a positioning hole; the flange connection seat includes a flange and a positioning sleeve connected to each other, the positioning sleeve is located in the positioning hole and is coaxially arranged with the positioning hole and is connected to the lead screw shaft for transmission, and the flange is located on the side of the filter holder away from the drive motor.

6. The filter switching device for a spectrometer according to claim 5, characterized in that, The filter switching device for the spectrometer further includes: a photoelectric sensor, an origin sensing element, and a controller. The photoelectric sensor is located on one side of the end of the lead screw shaft, and the origin sensing element is fixed to the end of the filter holder near the photoelectric sensor and cooperates with the photoelectric sensor. The photoelectric sensor and the drive motor are both electrically connected to the controller. The controller is used to control the drive motor to move the filter holder to the origin point, where the sensing sheet cooperates with the photoelectric sensor and records the actual number of pulses of the drive motor. The controller is also used to compare the actual number of pulses with the preset number of pulses to obtain a pulse compensation value for pulse compensation of the drive motor.

7. The filter switching device for a spectrometer according to claim 5, characterized in that, The filter switching device for the spectrometer further includes a housing, in which the drive motor and the filter holder are both located.

8. The filter switching device for a spectrometer according to claim 7, characterized in that, The bottom of the housing has a strip-shaped slide rail extending along the first direction, and the bottom of the filter holder has a sliding groove that slides in conjunction with the strip-shaped slide rail.

9. A spectrometer, characterized in that, include: A laser and a filter switching device for a spectrometer according to any one of claims 1-8, wherein the laser beam is directed to filters within a plurality of filter apertures.

10. The spectrometer according to claim 9, characterized in that, The spectrometer includes a Raman spectrometer or a miniature spectrometer.

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