Signal collection optical fiber device and microscopic Raman system adopting optical fiber to collect signals

Abstract

The utility model discloses a signal collection optical fiber device and a microscopic Raman system adopting an optical fiber to collect signals. The signal collecting optical fiber device comprises m collecting optical fiber bundles, one ends of the m collecting optical fiber bundles are arranged in a beam splitting mode and form m independent signal collecting ends, the other ends of the m collecting optical fiber bundles are arranged in a beam combining mode and form a signal output end, each collecting optical fiber bundle comprises n optical fibers, and at the signal collecting ends, n is larger than or equal to 1. At the signal output end, the n optical fibers contained in each collection optical fiber bundle are arranged in a two-dimensional surface-shaped structure, at the signal output end, the m * n optical fibers contained in the m collection optical fiber bundles are arranged in a one-dimensional linear structure, and m and n are positive integers. The utility model provides a microscopic Raman system adopting optical fibers to collect signals, which is simple, convenient and feasible, does not need to be switched, can improve the signal strength on the premise of not reducing the Raman spectrum resolution, and can improve the portability of a Raman spectrum system and reduce the requirements on site space due to the flexibility of the optical fibers.

Description

Technical Field

[0001] The utility model particularly relates to a signal collection optical fiber device and a microscopic Raman system using the optical fiber to collect signals, belonging to the technical field of optical measurement. Background Art

[0002] Raman spectroscopy is a non-destructive method for detecting the composition of materials. It uses laser-induced nonlinear Raman signals to reveal molecular structure. Due to its non-contact and non-destructive nature, it is widely used in composition analysis, material identification, and in-situ analysis.

[0003] When performing Raman spectroscopy, varying sample conditions place diverse demands on the excitation laser wavelength. Samples vary in absorption windows and fluorescence characteristics, necessitating the use of excitation lasers with varying wavelengths. Equipping a single Raman microscope with switchable multi-wavelength excitation lasers is a widespread requirement in Raman spectroscopy.

[0004] In the prior art, multi-wavelength Raman microscopic spectrometers that use optical fiber to collect signals typically employ the following solutions to ensure that the signals from multiple optical fibers are fed into the spectrometer's input: First, a mechanical switching device switches the positions of multiple optical fibers, positioning the signal-collecting fiber corresponding to the laser wavelength to be measured at the spectrometer's input. However, this approach is complex and cumbersome to operate, and frequent switching can affect spectral calibration accuracy. Second, fiber fusion splicing is used to fuse the ends of multiple optical fibers into a single, thicker fiber. However, this approach can reduce spectral resolution and signal strength. For example, the conditions required for spectral measurement are: the width of the spectrometer's entrance slit is 100μm, three optical fibers all have a core diameter of 100μm, and are combined into a fiber with a core diameter of 200 μm to ensure low loss. The signal light is concentrated in the fiber with a core diameter of 200μm. If the width of the spectrometer's entrance slit is maintained at 100μm, part of the signal light will be blocked by the slit, resulting in a decrease in signal intensity. If the spectrometer's entrance slit is adjusted to 200μm, the resolution of the spectral measurement will be reduced. Utility Model Content

[0005] The main purpose of the utility model is to provide a signal collection optical fiber device and a micro-Raman system using optical fiber to collect signals, thereby overcoming the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose of the utility model, the technical solutions adopted by the utility model include:

[0007] An embodiment of the present utility model provides a signal collection optical fiber device, which includes m collection optical fiber bundles, one end of the m collection optical fiber bundles is split and arranged to form m independent signal collection ends, and the other end is combined and arranged to form a signal output end, wherein each of the collection optical fiber bundles includes n optical fibers, and at the signal collection end, the n optical fibers contained in each collection optical fiber bundle are arranged in a two-dimensional surface structure, and at the signal output end, the m*n optical fibers contained in the m collection optical fiber bundles are arranged in a one-dimensional linear structure, and m and n are both positive integers.

[0008] A second aspect of an embodiment of the present utility model provides a microscopic Raman system that uses optical fiber to collect signals, including 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 includes the signal collection optical fiber device.

[0009] Compared with the existing technology, the advantages of the present invention include: the embodiment of the present invention provides a microscopic Raman system that uses optical fiber to collect signals, which is simple and easy to use, does not require switching, and can improve signal strength without reducing the resolution of the Raman spectrum. In addition, the microscopic Raman system that uses optical fiber to collect signals provided by the present invention can improve the portability of the Raman spectroscopy system due to the flexibility of optical fiber and reduce the requirements for site space. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 This is a schematic structural diagram of a micro-Raman system using optical fiber to collect signals provided in a typical embodiment of the present invention;

[0012] Figure 2 It is a structural schematic diagram of a signal collection optical fiber device provided in a typical implementation case of the utility model. DETAILED DESCRIPTION

[0013] In view of the shortcomings of the existing technology, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of this utility model. The following will further explain this technical solution, its implementation process and principles.

[0014] An embodiment of the present utility model provides a signal collection optical fiber device, which includes m collection optical fiber bundles, one end of the m collection optical fiber bundles is split and arranged to form m independent signal collection ends, and the other end is combined and arranged to form a signal output end, wherein each of the collection optical fiber bundles includes n optical fibers, and at the signal collection end, the n optical fibers contained in each collection optical fiber bundle are arranged in a two-dimensional surface structure, and at the signal output end, the m*n optical fibers contained in the m collection optical fiber bundles are arranged in a one-dimensional linear structure, and m and n are both positive integers.

[0015] Furthermore, at the signal collection end, the n optical fibers contained in each of the collection optical fiber bundles are arranged in a circular structure. It can be understood that one end of the n optical fibers is distributed in a circular area.

[0016] Furthermore, at the signal output end, m collection optical fiber bundles are sequentially arranged along the one-dimensional extension direction of the one-dimensional linear structure.

[0017] For example, m can be 2, 3, 4, etc., and n can be 2, 3, 4, 5, etc.

[0018] Furthermore, the number of optical fibers contained in the m collection optical fiber bundles is the same or different.

[0019] Furthermore, each of the collection optical fiber bundles is used to collect and transmit a Raman signal with a specific wavelength.

[0020] Furthermore, the wavelengths of the Raman signals collected and transmitted by any two of the collection optical fiber bundles are different.

[0021] A second aspect of an embodiment of the present utility model provides a microscopic Raman system that uses optical fiber to collect signals, including 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 includes the signal collection optical fiber device.

[0022] Furthermore, the Raman excitation collection optical path module includes m Raman excitation collection optical paths, and each of the Raman excitation collection optical paths corresponds to and is coupled with a signal collection end of the signal collection optical fiber device.

[0023] Furthermore, the signal output end of the signal collection optical fiber device is directly coupled to the spectrometer, or the signal output end of the signal collection optical fiber device is fixed at the entrance slit of the spectrometer.

[0024] Furthermore, a shading device is fixed on the spectrometer, and the shading device covers the entrance slit, and a portion of the signal collection optical fiber device close to the signal output end is arranged inside the shading device.

[0025] In a more specific embodiment, the micro-Raman system using optical fiber to collect signals further includes: a sample carrying device, which is at least used to carry the sample and drive the sample to move.

[0026] The following will further explain the technical solution, its implementation process and principles, etc. with reference to the accompanying drawings and specific implementation cases. Unless otherwise specified, the Raman excitation collection optical path module, microscopic optical path module, focusing module and spectrometer in the embodiments of the present invention are all known in the art, and their specific structures and product models are not limited here.

[0027] See also Figure 1 A microscopic Raman system that uses optical fiber to collect signals includes a Raman excitation and 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 carrying device 60. The sample carrying device 60 is mainly used to carry samples and drive the samples to move. The microscopic optical path module 20 is arranged between the Raman excitation and collection optical path module 10 and the focusing module 30. The Raman signal collection module 40 is arranged between the Raman excitation and collection optical path module 10 and the spectrometer 50. The incident laser is transmitted through the Raman excitation and collection optical path module 10 and the focusing module 30 in sequence and focused on the sample located on the sample carrying device 60, thereby exciting and obtaining a Raman signal. The Raman signal is transmitted back to the Raman excitation and 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 2The Raman excitation collection optical path module 10 includes an independently configured first Raman excitation collection optical path 11, a second Raman excitation collection optical path 12 and a third Raman excitation collection optical path 13. 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 are respectively used to transmit three lasers with different wavelengths. Correspondingly, the Raman signal collection module 40 includes a first collection optical fiber bundle 41, a second collection optical fiber bundle 42 and a third collection optical fiber bundle 43. The first collection optical fiber bundle 41, the second collection optical fiber bundle 42 and the third collection optical fiber bundle 43 are close to one end of the Raman excitation collection optical path module 10 for splitting and forming three independent signal collection ends, and the other end is combined and formed into a The signal output ends of the first collection fiber optic bundle 41, the second collection fiber optic bundle 42, and the third collection fiber optic bundle 43 are coupled to 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 respectively. The signal output end formed by the first collection fiber optic bundle 41, the second collection fiber optic bundle 42, and the third collection fiber optic bundle 43 is connected to the spectrometer 50; the Raman signals with different wavelengths formed by the excitation are coupled to the first collection fiber optic bundle 41, the second collection fiber optic bundle 42, and the third collection fiber optic bundle 43 via 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, and then input into the spectrometer 50.

[0029] In this embodiment, please refer to Figure 2 The first collection fiber bundle 41, the second collection fiber bundle 42, and the third collection fiber bundle 43 each include three optical fibers, and at the signal collection end, the three optical fibers contained in each collection fiber bundle are arranged in a two-dimensional circular structure, that is, one end of the three optical fibers are distributed in a circular area. At the signal output end, the nine optical fibers contained in the first collection fiber bundle 41, the second collection fiber bundle 42, and the third collection fiber bundle 43 are arranged in a one-dimensional linear structure, wherein the optical fibers contained in the first collection fiber bundle 41, the second collection fiber bundle 42, and the third collection fiber bundle 43 are arranged in sequence along the one-dimensional extension direction of the one-dimensional linear structure. At the signal collection end, the multiple optical fibers are arranged in a circular shape, which can improve the signal collection efficiency. The optical fibers are arranged in a one-dimensional linear structure at the signal output end, so that the multi-channel signal of the multi-wavelength micro-Raman spectrometer can be efficiently collected and detected without complex devices and switching, and without reducing the signal intensity or spectral resolution.

[0030] It should be noted that the number of Raman excitation collection optical paths included in the Raman excitation collection optical path module 10 and the number of collection optical fiber bundles included in the Raman signal collection module 40 are the same and correspond one to one. In this embodiment, a case is given in which the Raman signal collection module 40 includes three collection optical fiber bundles, and each collection optical fiber bundle includes three optical fibers. It can be understood that the Raman signal collection module 40 can of course be set with other numbers of collection optical fiber bundles according to specific needs, and each collection optical fiber bundle can also be set with other numbers of optical fibers.

[0031] In this embodiment, Raman signals 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 collection optical fiber bundle 41, the second collection optical fiber bundle 42, and the third collection optical fiber bundle 43 via coupling devices or other coupling structures known in the art. Extensive description of the known technologies in the art is omitted herein. The focusing module 30 may include an objective lens disk and an objective lens. The objective lens disk can realize the switching and fixing of the focusing element. The objective lens can be replaced with other optical elements with focusing functions, such as a focusing lens, a concave reflector, etc.

[0032] In this embodiment, the spectrometer 50 can be directly coupled / connected to the Raman signal collection module 40 without providing an entrance slit, and an optical fiber bundle can be used to replace the function of the entrance slit. For example, if the spectral test requires the entrance slit of the spectrometer to be 100 μm, then the optical fiber bundle can use an optical fiber with a core diameter of 100 μm, and the signal light is emitted from a single row of optical fibers with a core diameter of 100 μm and enters the spectrometer. The spectral resolution is the same as the 100 μm entrance slit of the spectrometer. Of course, the spectrometer 50 can also retain the entrance slit, and a light shielding device is provided at the entrance slit of the spectrometer 50. The function of the 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, thereby avoiding the entrance slit from being opened too wide and introducing too much stray light. Specifically, the light shielding device is box-shaped and is installed on the outside of the entrance slit of the spectrometer. A small hole is provided on the light shielding device for the signal output end of the Raman signal collection module 40 to pass through.

[0033] The specific working method of a micro-Raman system using optical fiber to collect signals provided in this embodiment is as follows:

[0034] When performing Raman spectroscopy testing, a laser with a specific wavelength is selected. If the first Raman excitation and collection optical path 11 is used for testing, the Raman signal enters the signal collection end of the first collection optical fiber bundle 41 and is output at the upper portion of the signal output end. If the second Raman excitation and collection optical path 12 is used for testing, the Raman signal enters the signal collection end of the second collection optical fiber bundle 42 and is output in the middle region of the signal output end. If the third Raman excitation and collection optical path 13 is used for testing, the Raman signal enters the signal collection end of the third collection optical fiber bundle 43 and is output at the lower portion of the signal output end. The signal output end of the optical fiber bundle can be connected to the entrance slit of a spectrometer. The entrance slit of the spectrometer is the same width and aligned with the core diameter of the optical fiber, allowing light from the optical fiber to enter the spectrometer.

[0035] The present invention provides a Raman microscope system that uses optical fiber to collect signals. The system is simple and easy to use, does not require switching, and can improve signal strength without reducing the resolution of the Raman spectrum. In addition, the present invention provides a Raman microscope system that uses optical fiber to collect signals. Due to the flexibility of the optical fiber, the system can improve the portability of the Raman spectrum system and reduce the space requirements.

[0036] It should be understood that the above embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A signal collection optical fiber device, characterized in that: include: m collection fiber bundles, one end of the m collection fiber bundles is split and arranged to form m independent signal collection ends, and the other end is combined and arranged to form a signal output end, wherein each of the collection fiber bundles includes n optical fibers, and at the signal collection end, the n optical fibers contained in each collection fiber bundle are arranged in a two-dimensional surface structure, and at the signal output end, the m*n optical fibers contained in the m collection fiber bundles are arranged in a one-dimensional linear structure, and m and n are both positive integers.

2. The signal collection optical fiber device according to claim 1, characterized in that: At the signal collecting end, the n optical fibers contained in each collecting optical fiber bundle are arranged in a circular structure.

3. The signal collection optical fiber device according to claim 1, characterized in that: At the signal output end, m collection optical fiber bundles are sequentially arranged along the one-dimensional extension direction of the one-dimensional linear structure.

4. The signal collection optical fiber device according to claim 1 or 3, characterized in that: The m collection fiber bundles may contain the same or different numbers of optical fibers.

5. The signal collection optical fiber device according to claim 1 or 3, characterized in that: Each of the 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 collection optical fiber bundles are different.

6. A Raman microscope system using optical fiber to collect signals, 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 according to any one of claims 1 to 5.

7. The micro-Raman system for collecting signals using optical fiber according to claim 6, characterized in that: The Raman excitation collection optical path module includes m Raman excitation collection optical paths, and each of the Raman excitation collection optical paths corresponds to and is coupled with a signal collection end of the signal collection optical fiber device.

8. The micro-Raman system using optical fiber to collect signals according to claim 6, characterized in that: The signal output end of the signal collection optical fiber device is directly coupled to the spectrometer, or the signal output end of the signal collection optical fiber device is fixed at the entrance slit of the spectrometer.

9. The micro-Raman system using optical fiber to collect signals according to claim 8, 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 end is arranged inside the light shielding device.

10. The micro-Raman system for collecting signals using optical fiber according to claim 6, characterized in that: Also includes: The sample carrying device is at least used for carrying the sample and driving the sample to move.

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