Signal collection optical fiber device and multi-wavelength microscopic Raman spectrometer
Through the design of the signal collection optical fiber device, the complexity and spectral resolution problems of multi-wavelength microscope Raman spectrometer are solved, the signal intensity is improved and the operation is simple, and the efficient collection and detection of multi-wavelength signals is achieved.
Patent Information
- Application Number
- CN202422164369.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-04
AI Technical Summary
The existing multi-wavelength micro Raman spectrometers have problems in the signal collection process, such as complex devices and troublesome operation, and switching can easily affect the accuracy of spectral calibration, signal intensity and spectral resolution.
A signal collection optical fiber device is adopted, including multiple Raman signal collection optical fiber bundles. Each optical fiber bundle is arranged in a two-dimensional surface-shaped structure at the signal collection end, and a one-dimensional linear structure at the signal output end, forming a two-dimensional rectangular array to achieve efficient collection and detection of multi-wavelength signals, avoiding the problems caused by mechanical switching and fiber fusion splicing.
It realizes the improvement of signal intensity without reducing spectral resolution, simplifies the operation process, improves signal collection efficiency, and avoids complex devices and signal losses.
Smart Images
Figure CN223192823U_ABST
Abstract
Description
Technical Field
[0001] The utility model particularly relates to a signal collection optical fiber device and a multi - wavelength micro - Raman spectrometer, belonging to the technical field of optical measurement. Background Technique
[0002] Raman spectroscopy technology is a non - destructive method for detecting the composition of substances. By using laser to excite the non - linear Raman signal of the sample, molecular structure information can be obtained. Due to its non - contact and non - destructive detection characteristics, it is widely used in scenarios such as component analysis, substance identification, and in - situ analysis.
[0003] When performing Raman spectroscopy detection, different sample conditions pose diverse requirements for the excitation laser wavelength. The absorption windows and fluorescence characteristics of samples are different, so excitation lasers of different wavelengths need to be selected. Equipping a micro - Raman spectrometer with switchable multi - wavelength excitation lasers is a widespread requirement for Raman spectroscopy analysis technology.
[0004] In the prior art, for a multi - wavelength micro - Raman spectrometer that uses optical fibers to collect signals, in order to input the signals of multiple optical fibers into the entrance of the spectrometer, the following solutions are usually adopted: First: A mechanical switching device is used to switch the positions of multiple optical fibers so that the signal collection optical fiber corresponding to the laser wavelength to be measured is located at the entrance of the spectrometer. However, the device for implementing this method is complex, the operation is troublesome, and frequent switching over a long time is likely to affect the accuracy of spectral calibration. Second: One end of multiple optical fibers is fused into a thicker optical fiber by means of optical fiber fusion. However, this method will cause a decrease in spectral resolution and signal intensity. For example, the conditions required for spectral measurement are: the width of the entrance slit of the spectrometer is 100μm, and all three optical fibers are optical fibers with a core diameter of 100μm. They are combined into an optical fiber with a core diameter of 200μm to ensure low loss. The signal light is concentrated in the optical fiber with a core diameter of 200μm. If the width of the entrance slit of the spectrometer remains 100μm, part of the signal light will be blocked by the slit, resulting in a decrease in signal intensity. If the entrance slit of the spectrometer is adjusted to 200μm, the spectral measurement resolution will be reduced. Content of the Utility Model
[0005] The main purpose of the utility model is to provide a signal collection optical fiber device and a multi - wavelength micro - Raman spectrometer, so as to overcome the deficiencies in the prior art.
[0006] To achieve the aforementioned utility model purpose, the technical solutions adopted by the utility model include:
[0007] An embodiment of the present utility model provides a signal collection optical fiber device for a multi-wavelength micro-Raman spectrometer, which includes: x Raman signal collection optical fiber bundles. Each of the Raman signal collection optical fiber bundles has a signal collection structure and a signal output structure. One ends of the x Raman signal collection optical fiber bundles are split and arranged to form x signal collection ends. Each of the signal collection ends has a signal collection structure. The other ends of the x Raman signal collection optical fiber bundles are combined and arranged to form a signal output end. The x signal output structures are arranged at the same signal output end. Wherein, each of the Raman signal collection optical fiber bundles includes y optical fibers. At the signal collection end, the y optical fibers included in each of the signal collection structures are arranged in a two-dimensional planar structure; at the signal output end, the y optical fibers included in each of the signal output structures are arranged in a one-dimensional linear structure. The x*y optical fibers included in the x signal output structures are arranged in a two-dimensional rectangular array structure. x≥2, y≥2, and both x and y are positive integers.
[0008] A second aspect of the embodiment of the present utility model provides a multi-wavelength micro-Raman spectrometer, which includes a Raman excitation and collection optical path module, a microscopic optical path module, a focusing module, a Raman signal collection module, and a spectrometer. The signal collection end of the Raman signal collection module is coupled to the Raman excitation and collection optical path module, and the signal output end is coupled to the spectrometer. Wherein, the Raman signal collection module is the signal collection optical fiber device of the multi-wavelength micro-Raman spectrometer.
[0009] Compared with the prior art, the advantages of the present utility model include: the present utility model proposes a multi-wavelength micro-Raman spectrometer, which is simple and easy to operate, without switching, can improve the signal intensity without reducing the Raman spectrum resolution. And, the multi-wavelength micro-Raman spectrometer provided by the present utility model can achieve high-efficiency collection and detection of multi-channel signals of the multi-wavelength micro-Raman spectrometer without complex devices and switching, and without reducing the signal intensity or spectrum resolution. Description of the Drawings
[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.
[0011] Figure 1 It is a schematic structural diagram of a multi-wavelength micro-Raman spectrometer provided in a typical embodiment of the present utility model;
[0012] Figure 2It is a schematic structural diagram of a signal collection optical fiber device provided in a typical embodiment of the present utility model. Detailed implementation manners
[0013] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present utility model through long-term research and a large number of practices. The following will further explain the technical solution, its implementation process, principles, etc.
[0014] The embodiment of the present utility model provides a signal collection optical fiber device for a multi-wavelength microscopic Raman spectrometer, which includes: x Raman signal collection optical fiber bundles. Each of the Raman signal collection optical fiber bundles has a signal collection structure and a signal output structure. One end parts of the x Raman signal collection optical fiber bundles are branched and arranged to form x signal collection ends. Each of the signal collection ends has a signal collection structure. The other end parts of the x Raman signal collection optical fiber bundles are combined and arranged to form a signal output end. The x signal output structures are arranged at the same signal output end. Among them, each of the Raman signal collection optical fiber bundles includes y optical fibers. At the signal collection end, the y optical fibers included in each of the signal collection structures are arranged in a two-dimensional planar structure; at the signal output end, the y optical fibers included in each of the signal output structures are arranged in a one-dimensional linear structure. The x*y optical fibers included in the x signal output structures are arranged in a two-dimensional rectangular array structure. x≥2, y≥2, and both x and y are positive integers.
[0015] For example, the value of x can be 2, 3, 4, 5, 6, 7, 8, 9…, and the value of y can be 2, 3, 4, 5, 6, 7, 8, 9….
[0016] Furthermore, at the signal collection end, the y optical fibers included in each of the signal collection structures are arranged in a circular structure.
[0017] Furthermore, at the signal output end, the x signal output structures are arranged in parallel. Preferably, in the one-dimensional extension direction of the signal output structure, at least two adjacent signal output structures are arranged in a staggered manner.
[0018] Furthermore, at the signal output end, the minimum center distance between two adjacent signal output structures is r, where r is the radius of a single optical fiber.
[0019] Furthermore, the number of optical fibers included in the x Raman signal collection optical fiber bundles can be the same or different.
[0020] Furthermore, each of the Raman signal collection optical fiber bundles is used to collect and transmit a Raman signal with a specific wavelength.
[0021] Further, the wavelengths of the Raman signals collected and transmitted by any two of the Raman signal collection fiber bundles are different.
[0022] The second aspect of the embodiment of the present invention provides a multi-wavelength microscopic Raman spectrometer, which includes a Raman excitation collection optical path module, a microscopic optical path module, a focusing module, a Raman signal collection module, and a spectrometer. The signal collection end of the Raman signal collection module is coupled to the Raman excitation collection optical path module, and the signal output end is coupled to the spectrometer. Among them, the Raman signal collection module includes a signal collection fiber device of the multi-wavelength microscopic Raman spectrometer.
[0023] Further, the Raman excitation collection optical path module includes x Raman excitation collection optical paths, and each Raman excitation collection optical path corresponds to and is coupled to a signal collection structure of the signal collection fiber device.
[0024] Further, the signal output structure of the signal collection fiber device is directly coupled to the spectrometer, or the signal output structure of the signal collection fiber device is fixed at the entrance slit of the spectrometer.
[0025] Further, a light shielding device is also fixed on the spectrometer. The light shielding device covers the entrance slit, and the part of the signal collection fiber device close to the signal output structure is arranged inside the light shielding device.
[0026] As follows, the technical solution, its implementation process and principle, etc. will be further explained in conjunction with the drawings and specific implementation cases. Unless otherwise specified, the Raman excitation collection optical path module, microscopic optical path module, focusing module, spectrometer, etc. in the embodiment of the present invention are all known in the art, and their specific structures and product models, etc. are not limited herein.
[0027] Please refer to Figure 1 , a multi-wavelength microscopic Raman spectrometer, which includes a Raman excitation collection optical path module 10, a microscopic optical path module 20, a focusing module 30, a Raman signal collection module 40, a spectrometer 50, and a sample carrier device 60. The sample carrier device 60 is mainly used to carry the sample and drive the sample to move. The microscopic optical path module 20 is arranged between the Raman excitation collection optical path module 10 and the focusing module 30. The Raman signal collection module 40 is arranged between the Raman excitation collection optical path module 10 and the spectrometer 50. The incident laser is sequentially transmitted through the Raman excitation collection optical path module 10 and the focusing module 30 and focused on the sample located on the sample carrier device 60 to obtain Raman signals by excitation. The Raman signals are transported back to the Raman excitation collection optical path module 10 through the focusing module 30, coupled to the Raman signal collection module 40 through a coupling device, and transmitted to the spectrometer 50 through the Raman signal collection module 40.
[0028] In this embodiment, please refer to Figure 1 and Figure 2 , the Raman excitation and collection optical path module 10 includes independently configured first, second, and third Raman excitation and collection optical paths 11, 12, and 13. The first, second, and third Raman excitation and collection optical paths 11, 12, and 13 are respectively used to transmit three lasers with different wavelengths. Correspondingly, the Raman signal collection module 40 includes a first Raman signal collection fiber bundle 41, a second Raman signal collection fiber bundle 42, and a third Raman signal collection fiber bundle 43. Each of the Raman signal collection fiber bundles has a signal collection structure and a signal output structure. The ends of the first, second, and third Raman signal collection fiber bundles 41, 42, and 43 close to the Raman excitation and collection optical path module 10 are split and arranged to form three independent signal collection structures, and the three signal collection structures respectively correspond to three signal collection ends. The other ends are combined and arranged to form a structure including three signal output structures, and the three signal output structures are located at the same signal output end. The first signal collection structure 411 of the first Raman signal collection fiber bundle 41, the second signal collection structure 421 of the second Raman signal collection fiber bundle 42, and the third signal collection structure 431 of the third Raman signal collection fiber bundle 43 are respectively coupled to the first, second, and third Raman excitation and collection optical paths 11, 12, and 13. The common signal output end of the first, second, and third Raman signal collection fiber bundles 41, 42, and 43 is connected to the spectrometer 50, that is, the first signal output structure 412 of the first Raman signal collection fiber bundle 41, the second signal output structure 422 of the second Raman signal collection fiber bundle 42, and the third signal output structure 432 of the third Raman signal collection fiber bundle 43 are connected to the spectrometer 50; Raman signals with different wavelengths formed by excitation are respectively coupled to the first, second, and third Raman signal collection fiber bundles 41, 42, and 43 through the first, second, and third Raman excitation and collection optical paths 11, 12, and 13, and then are input into the spectrometer 50.
[0029] In this embodiment, please further refer to Figure 2, the first Raman signal collection fiber bundle 41, the second Raman signal collection fiber bundle 42, and the third Raman signal collection fiber bundle 43 each include seven optical fibers. And at the signal collection end, the seven optical fibers included in the first signal collection structure 411, the second signal collection structure 421, and the third signal collection structure 431 are arranged in a two-dimensional circular structure. Specifically, one optical fiber is located in the central area, and the remaining six optical fibers surround this optical fiber. At the signal output end, the seven optical fibers included in each of the first signal output structure 412, the second signal output structure 422, and the third signal output structure 432 are arranged in a one-dimensional linear structure. The first signal output structure 412, the second signal output structure 422, and the third signal output structure 432 are arranged in parallel as a whole. That is, the twenty-one optical fibers included in the first signal output structure 412, the second signal output structure 422, and the third signal output structure 432 are arranged in a two-dimensional rectangular array structure.
[0030] In this embodiment, the first signal output structure 412, the second signal output structure 422, and the third signal output structure 432 are arranged in parallel along a direction perpendicular to the one-dimensional extension direction of the first signal output structure 412 itself. And in the one-dimensional extension direction of the first signal output structure 412, the first signal output structure 412, the second signal output structure 422, and the third signal output structure 432 are arranged in a staggered manner to reduce the spacing in the lateral direction (the direction perpendicular to the one-dimensional extension direction of the first signal output structure 412 itself). Specifically, at the signal output end, the minimum center distance between the first signal output structure 412, the second signal output structure 422, and the third signal output structure 432 is r, where r is the radius of a single optical fiber.
[0031] Specifically, the Raman signal collection module mainly formed by multiple Raman signal collection fiber bundles includes multiple separately arranged signal collection ends and one signal output end. Each signal collection end has a signal collection structure, and this one signal output end has multiple signal output structures. Specifically, at the signal collection end, the multiple optical fibers included in each signal collection structure are arranged in a circular shape, which can improve the signal collection efficiency. At the same time, the fiber bundles are arranged as multiple parallel linear structures at the signal output end and correspond to multiple signal output structures. Each signal output structure corresponds to the Raman signal of a laser wavelength. In this way, without a complex device and switching, without sacrificing the number of optical fibers and signal collection efficiency, and without reducing the signal intensity or spectral resolution, the multi-channel signal can be efficiently collected and detected by a multi-wavelength microscopic Raman spectrometer.
[0032] It should be noted that the number of Raman excitation collection optical paths included in the Raman excitation collection optical path module 10 is the same as the number of Raman signal collection optical fiber bundles included in the Raman signal collection module 40, and they are in one-to-one correspondence. In this embodiment, a case is given where the Raman signal collection module 40 includes three Raman signal collection optical fiber bundles, and each Raman signal collection optical fiber bundle includes seven optical fibers. It can be understood that the Raman signal collection module 40 can of course be set with other numbers of Raman signal collection optical fiber bundles according to specific requirements, and each Raman signal collection optical fiber bundle can also be set with other numbers of optical fibers.
[0033] In this embodiment, the Raman signal can be transmitted from the first Raman excitation collection optical path 11, the second Raman excitation collection optical path 12, and the third Raman excitation collection optical path 13 to the first Raman signal collection optical fiber bundle 41, the second Raman signal collection optical fiber bundle 42, and the third Raman signal collection optical fiber bundle 43 through a coupling device or other coupling structures known in the art. Here, not too much description is given to the technologies known in the art.
[0034] In this embodiment, the focusing module 30 may include an objective turret and an objective lens. The objective turret can realize the switching and fixation of the focusing elements. The objective lens can be replaced by other optical elements with focusing functions, such as focusing lenses, concave mirrors, etc. The sample carrier device 60 may include a sample stage and a sample to be measured, etc. The sample stage can be a manual displacement stage, an electric displacement stage, a cuvette, a gas cell, an in-situ cell, etc. of the sample carrier device. Its main function is to ensure the loading and movement of the sample, and its specific structure is not overly limited here.
[0035] In this embodiment, the spectrometer 50 may be directly coupled / connected to the Raman signal collection module 40 without setting an entrance slit, and use an optical fiber bundle to replace the function of the entrance slit. For example, if the entrance slit of the spectrometer for spectral testing needs to be 100 μm, then an optical fiber bundle with a core diameter of 100 μm can be used. The signal light exits from the single-row optical fiber with a core diameter of 100 μm and enters the spectrometer, and the spectral resolution is the same as that of the spectrometer entrance slit of 100 μm. Of course, the spectrometer 50 can also retain the entrance slit. There is a light-shielding device at the entrance slit of the spectrometer 50. The function of this light-shielding device is to only allow the signal light transmitted through the Raman signal collection module 40 to enter the spectrometer, while shielding other stray light, so as to avoid introducing too much stray light due to the opening of the entrance slit. Specifically, the light-shielding device is in a box shape and is installed outside the entrance slit of the spectrometer. There are small holes on the light-shielding device for the signal output structure of the Raman signal collection module 40 to penetrate. At the same time, since the signal output end has multiple rows of optical fibers, there is a lateral position offset of the Raman signals excited by different laser wavelengths at the spectrometer entrance, and they need to be calibrated separately.
[0036] The specific working mode of a multi-wavelength microscopic Raman spectrometer provided in this embodiment is as follows:
[0037] When performing Raman spectroscopy tests, a laser with a specific wavelength is selected. If the first Raman excitation collection optical path 11 is used for testing, the Raman signal enters the first signal collection structure 411 of the first Raman signal collection fiber bundle 41 and is output at the first signal output structure 412 at the signal output end; if the second Raman excitation collection optical path 12 is used for testing, the Raman signal enters the second signal collection structure 421 of the second Raman signal collection fiber bundle 42 and is output at the second signal output structure 422 at the signal output end; if the third Raman excitation collection optical path 13 is used for testing, the Raman signal enters the third signal collection structure 431 of the third Raman signal collection fiber bundle 43 and is output at the third signal output structure 432 at the signal output end. The signal output end of the fiber bundle can be connected to the entrance slit of the spectrometer. The entrance slit of the spectrometer is of the same width as and aligned with the core diameter of the fiber, enabling the light of the fiber to enter the spectrometer.
[0038] Specifically, since the signal collection fiber device of the present utility model uses a multi-row fiber arrangement at the signal output end instead of a single-row fiber, more fibers can be accommodated in the limited light collection area of the spectrometer. Correspondingly, each Raman signal collection fiber bundle can also include more fibers, thereby improving the collection efficiency of the signal collection end.
[0039] A multi-wavelength microscopic Raman spectrometer provided by an embodiment of the present utility model is simple and easy to operate, without the need for switching. It can enhance the signal intensity without reducing the Raman spectroscopy resolution. Moreover, the multi-wavelength microscopic Raman spectrometer provided by the embodiment of the present utility model can achieve high-efficiency collection and detection of multi-channel signals of the multi-wavelength microscopic Raman spectrometer without a complex device and switching, and without reducing the signal intensity or spectroscopy resolution.
[0040] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present utility model, and their purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. It cannot be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit of the present utility model should be covered within the protection scope of the present utility model.
Claims
1. A signal collection optical fiber device for a multi-wavelength micro-Raman spectrometer, characterized in that: include: x Raman signal collection fiber optic bundles, each of the Raman signal collection fiber optic bundles has a signal collection structure and a signal output structure, one end portion of the x Raman signal collection fiber optic bundles is bundled to form x signal collection ends, each of the signal collection ends has a signal collection structure, the other end portions of the x Raman signal collection fiber optic bundles are bundled to form a signal output end, and the x signal output structures are arranged at the same signal output end, wherein each Raman signal collection fiber optic bundle includes y optical fibers, and at the signal collection end, the y optical fibers contained in each of the signal collection structures are arranged in a two-dimensional planar structure; at the signal output end, the y optical fibers contained in each of the signal output structures are arranged in a one-dimensional linear structure, and the x*y optical fibers contained in the x signal output structures are arranged in a two-dimensional rectangular array structure, x≥2, y≥2, and x and y are both positive integers.
2. The signal collection optical fiber device for a multi-wavelength Raman micro-spectrometer according to claim 1, characterized in that: At the signal collecting end, the y optical fibers included in each signal collecting structure are arranged in a circular structure.
3. The signal collection optical fiber device for a multi-wavelength Raman micro-spectrometer according to claim 1, characterized in that: At the signal output end, x signal output structures are arranged in parallel; Preferably, in the one-dimensional extension direction of the signal output structure, at least two adjacent signal output structures are staggered.
4. The signal collection optical fiber device for a multi-wavelength micro-Raman spectrometer according to claim 1 or 3, characterized in that: At the signal output end, the minimum center distance between two adjacent signal output structures is r, r is the radius of a single optical fiber.
5. The signal collection optical fiber device for a multi-wavelength Raman micro-spectrometer according to claim 1, characterized in that: The x Raman signal collection optical fiber bundles may contain the same or different numbers of optical fibers.
6. The signal collection optical fiber device for a multi-wavelength Raman micro-spectrometer according to claim 1, characterized in that: Each of the Raman signal collection optical fiber bundles is used to collect and transmit a Raman signal with a specific wavelength; Preferably, the wavelengths of the Raman signals collected and transmitted by any two of the Raman signal collection optical fiber bundles are different.
7. A multi-wavelength micro-Raman spectrometer, comprising a Raman excitation and collection optical path module, a microscopic optical path module, a focusing module, a Raman signal collection module, and a spectrometer, wherein the signal collection end of the Raman signal collection module is coupled to the Raman excitation and collection optical path module, and the signal output end is coupled to the spectrometer, characterized in that: The Raman signal collection module includes the signal collection optical fiber device of the multi-wavelength micro-Raman spectrometer according to any one of claims 1 to 6.
8. The multi-wavelength Raman microscope according to claim 7, characterized in that: The Raman excitation collection optical path module includes x Raman excitation collection optical paths, and each of the Raman excitation collection optical paths corresponds to and is coupled with a signal collection structure of the signal collection optical fiber device.
9. The multi-wavelength Raman microscope according to claim 7, wherein: The signal output structure of the signal collection optical fiber device is directly coupled to the spectrometer, or the signal output structure of the signal collection optical fiber device is fixed at the entrance slit of the spectrometer.
10. The multi-wavelength Raman microscope according to claim 9, characterized in that: A light shielding device is also fixed on the spectrometer, and the light shielding device covers the entrance slit. The portion of the signal collection optical fiber device close to the signal output structure is arranged inside the light shielding device.