Dual-wavelength Raman probe and Raman spectrometer

Abstract

The invention relates to a Raman spectrum technology, and particularly discloses a dual-wavelength Raman probe and a Raman spectrograph, the dual-wavelength Raman probe comprises a first laser module, a second laser module, a dual-wavelength acquisition module and a Raman filtering module, the first laser module comprises a first dichroscope, the second laser module comprises a second dichroscope, the dual-wavelength acquisition module comprises a first wavelength, and the Raman filtering module comprises a second wavelength. The dual-wavelength acquisition module comprises a third dichroscope and a third lens; and the Raman filtering module comprises a fourth dichroscope and a fourth lens. The dual-wavelength laser beam passes through the first laser module, the second laser module and the dual-wavelength acquisition module, and two Raman signals scattered after irradiating a sample are finally focused to the same external spectrometer through the Raman filtering module for Raman signal analysis. Raman channels can be integrated to form a single spectrum channel, and dual-wavelength Raman signals can be collected through the single spectrum channel without arranging two spectrometers.

Description

Technical Field

[0001] The present application relates to Raman spectroscopy technology, and in particular to a dual-wavelength Raman probe and a Raman spectrometer. Background Art

[0002] The dual-wavelength Raman probe is a spectral detection device that combines two different excitation wavelengths. Its core design uses the Raman scattering effect to obtain the molecular vibration information of the sample by synchronously or alternately exciting the sample. The working principle of the dual-wavelength Raman probe involves two different laser wavelengths, usually two different lasers emitting laser beams of two wavelengths. The common wavelength combination is the visible light wavelength of 532nm and the near-infrared wavelength of 785nm. The laser beam is introduced into the probe through an optical fiber and focused on the sample. The molecules in the sample will interact with the laser and Raman scattering will occur. The dual-wavelength Raman signals will be collected separately and analyzed by a spectrometer.

[0003] The prior art uses dual excitation wavelengths and dual Raman signal acquisition channels, so two spectrometers corresponding to the excitation wavelengths are required, which is costly and the equipment is complex. For example, the prior art discloses a dual-wavelength laser confocal Raman probe and a Raman spectrometer, the Raman spectrometer comprising: a dual-wavelength laser confocal Raman probe; a laser module, the laser module comprising a first laser connected to the first laser module through a first laser transmission optical fiber and a second laser connected to the second laser module through a second laser transmission optical fiber; and a spectrum analysis module, the spectrum analysis module comprising a first spectrometer connected to the first laser module through a first Raman transmission optical fiber and a second spectrometer connected to the second laser module through a second Raman transmission optical fiber.

[0004] The above-mentioned Raman probe and Raman spectrometer can use two wavelengths of laser to perform confocal Raman excitation on the sample under test, and collect and spectrally analyze the two bands of Raman scattered light emitted by the sample. However, the equipment is still provided with a first spectrometer and a second spectrometer that match the first laser and the second laser, that is, the technical solution still uses two Raman channels, and the cost of the detector still needs to be further reduced; in addition, it needs to control the two spectrometers at the same time and splice the collected data of the two spectrometers, and the equipment operation requirements are more. Therefore, there is a need for further reducing the cost of equipment and simplifying equipment and operation. Summary of the invention

[0005] In order to solve the problem of high cost caused by using two Raman channels, the present application provides a dual-wavelength Raman probe, which integrates two Raman channels into one Raman channel. Based on the dual-wavelength Raman probe, the present application also provides a Raman spectrometer.

[0006] The present application provides a dual-wavelength Raman probe, which adopts the following technical solution: A dual-wavelength Raman probe comprises a first laser module, a second laser module, a dual-wavelength acquisition module and a Raman filter module, wherein the first laser module comprises a first dichroic mirror, the first dichroic mirror is used to reflect a laser beam of a first preset wavelength and transmit a Raman signal of a first preset wavelength; the second laser module comprises a second dichroic mirror, the second dichroic mirror is used to reflect a laser beam of a second preset wavelength and transmit a Raman signal of a second preset wavelength; The dual-wavelength acquisition module includes a third dichroic mirror and a third lens. The third dichroic mirror is located on one side of the first dichroic mirror and on one side of the second dichroic mirror. The third dichroic mirror is used to transmit the first preset wavelength laser beam and the first preset wavelength Raman signal respectively and reflect the second preset wavelength laser beam and the second preset wavelength Raman signal respectively. The third lens is located on the side of the third dichroic mirror away from the first dichroic mirror or the second dichroic mirror and focuses the first preset wavelength laser beam and the second preset wavelength laser beam respectively. The third lens collimates the first preset wavelength Raman signal and the second preset wavelength Raman signal respectively. The Raman filter module includes a fourth dichroic mirror and a fourth lens. The fourth dichroic mirror is located on the other side of the first dichroic mirror and on the other side of the second dichroic mirror. The fourth dichroic mirror is used to reflect the first preset wavelength Raman signal and transmit the second preset wavelength Raman signal. The fourth lens is located on the side of the fourth dichroic mirror away from the first dichroic mirror or the second dichroic mirror and focuses the first preset wavelength Raman signal and the second preset wavelength Raman signal respectively.

[0007] By adopting the above technical solution, its working principle is as follows: the first preset wavelength laser beam and the second preset wavelength laser beam are output by two external laser light sources respectively, the first dichroic mirror is arranged on the emission light path of the first preset wavelength laser beam, the first preset wavelength laser beam is reflected to the third dichroic mirror via the first dichroic mirror, and then transmitted to the third lens via the third dichroic mirror, and then irradiated to the sample to be tested after being focused by the third lens, thereby forming a complete emission light path channel of the first preset wavelength laser beam, similarly, the second dichroic mirror is arranged on the emission light path of the second preset wavelength laser beam, the second preset wavelength laser beam is reflected to the third dichroic mirror via the second dichroic mirror, and then reflected to the third lens via the third dichroic mirror, and then irradiated to the sample to be tested after being focused by the third lens, thereby forming a complete emission light path channel of the second preset wavelength laser beam.

[0008] The above-mentioned first preset wavelength laser beam is focused and irradiated onto the surface of the sample to be tested. The first preset wavelength Raman signal scattered by the molecular interaction between the laser and the sample is collimated by the third lens. The collimated first preset wavelength Raman signal is transmitted through the third dichroic mirror and the first dichroic mirror in sequence, and then irradiated onto the fourth dichroic mirror. After being focused by the fourth lens, it is connected to the external spectrometer signal, thereby forming a complete Raman signal collection channel for the first preset wavelength laser beam.

[0009] The above-mentioned second preset wavelength laser beam is focused and irradiated onto the surface of the sample to be tested. The second preset wavelength Raman signal scattered by the molecular interaction between the laser and the sample is collimated by the third lens. The collimated second preset wavelength Raman signal is reflected by the third dichroic mirror and transmitted by the second dichroic mirror in sequence, and then irradiated onto the fourth dichroic mirror. It is then focused by the fourth lens and connected to the external spectrometer signal, thereby forming a complete Raman signal collection channel for the second preset wavelength laser beam.

[0010] According to the above principle, under the dual-wavelength laser excitation of the first preset wavelength laser beam and the second preset wavelength laser beam, the first preset wavelength laser beam passes through the first laser module and the dual-wavelength acquisition module, and the Raman signal (i.e., the first preset wavelength Raman signal) scattered after irradiating the sample is finally focused to the external spectrometer through the Raman filter module for Raman signal analysis. At the same time, the second preset wavelength laser beam passes through the second laser module and the dual-wavelength acquisition module, and the other Raman signal (i.e., the second preset wavelength Raman signal) scattered after irradiating the sample is finally focused to the same external spectrometer through the Raman filter module for Raman signal analysis. Therefore, the present application can integrate the Raman channels into a single spectral channel, and the collection of dual-wavelength Raman signals can be realized through the single spectral channel.

[0011] Preferably, the first laser module further includes a first lens, and the second laser module further includes a second lens, and the first lens and the second lens are collimating lenses respectively, and the first preset wavelength laser beam is emitted to one side of the first dichroic mirror via the first lens, and the second preset wavelength laser beam is emitted to one side of the second dichroic mirror via the second lens.

[0012] By adopting the above technical solution, as a specific structural example, by setting the above first lens and the second lens, the first preset wavelength laser beam and the second preset wavelength laser beam are collimated respectively.

[0013] Preferably, the first laser module further includes a first reflector, and the first reflector is used to reflect the first preset wavelength laser beam so that the first preset wavelength laser beam is emitted toward one side of the first dichroic mirror.

[0014] By adopting the above technical solution, as a structural example, the direction of the laser light is changed by the above first reflector. More specifically, the first reflector is a plane reflector, and the angle of the first reflector can be adjusted according to actual needs.

[0015] Preferably, the first laser module further comprises a first filter having a transmission wavelength consistent with the first preset wavelength laser beam, and the first preset wavelength laser beam is emitted to one side of the first dichroic mirror via the first filter.

[0016] By adopting the above technical solution, as a structural example, a first filter having a transmission wavelength consistent with the first preset wavelength laser beam is set. After the light beam passes through the first filter, the laser light having a wavelength the same as the wavelength of the first preset wavelength laser beam is selected to filter out the unnecessary wavelength. More specifically, the angle of the first filter is preferably perpendicular or close to perpendicular to the direction of light beam emission, for example, 180° to the above first lens, to ensure a better filtering effect. The first filter can be a laser line filter.

[0017] Preferably, the second laser module also includes a second reflector and / or a third reflector, the second reflector is used to reflect the second preset wavelength laser beam so that the second preset wavelength laser beam is emitted toward one side of the second dichroic mirror; the third reflector is used to respectively reflect the second preset wavelength laser beam and the second preset wavelength Raman signal so that the second preset wavelength laser beam is emitted toward the other side of the third dichroic mirror, and the second preset wavelength Raman signal is emitted toward one side of the second dichroic mirror.

[0018] By adopting the above technical solution, as a structural example, the direction of the laser light is changed by the second reflector and the third reflector. More specifically, the second reflector and the third reflector are both plane reflectors, and the angles of the second reflector and the third reflector can be adjusted according to actual needs.

[0019] Preferably, the second laser module further comprises a second filter having a transmission wavelength consistent with the second preset wavelength laser beam, and the second preset wavelength laser beam is emitted to one side of the second dichroic mirror via the second filter.

[0020] By adopting the above technical solution, as a structural example, a second filter having a transmission wavelength consistent with the second preset wavelength laser beam is set. After the light beam passes through the second filter, the laser light having a wavelength the same as the wavelength of the second preset wavelength laser beam is selected to filter out the unnecessary wavelength. More specifically, the angle of the second filter is preferably perpendicular or close to perpendicular to the direction of light beam emission, for example, 180° to the second lens, to ensure a better filtering effect. The second filter can be a laser line filter.

[0021] Preferably, the Raman filter module also includes a fourth reflector, a third filter whose cutoff wavelength is consistent with the first preset wavelength Raman signal, and a fourth filter whose cutoff wavelength is consistent with the second preset wavelength Raman signal. The fourth reflector is located on the other side of the first dichroic mirror. The fourth reflector is used to reflect the first preset wavelength Raman signal so that the first preset wavelength Raman signal is emitted toward the side of the fourth dichroic mirror away from the first dichroic mirror or the second dichroic mirror; the third filter and the fourth filter are long-pass filters respectively, the first preset wavelength Raman signal is emitted to one side of the fourth dichroic mirror via the third filter, and the second preset wavelength Raman signal is emitted to the other side of the fourth dichroic mirror via the fourth filter.

[0022] By adopting the above technical solution, as a structural example, the emission direction of the Raman signal is changed by the above fourth reflector. More specifically, the fourth reflector is a plane reflector, and the angle of the fourth reflector can be adjusted according to actual needs.

[0023] A third filter having a cutoff wavelength consistent with the first preset wavelength Raman signal and a fourth filter having a cutoff wavelength consistent with the second preset wavelength Raman signal are set. After the light beam passes through the third filter, the laser signal in the first preset wavelength Raman signal is filtered and the Raman signal is retained. Similarly, after the light beam passes through the fourth filter, the laser signal in the second preset wavelength Raman signal is filtered and the Raman signal is retained. More specifically, the angles of the third filter and the fourth filter can be adjusted according to actual needs, preferably perpendicular or nearly perpendicular to the direction of light beam emission.

[0024] The present application also provides a Raman spectrometer, comprising the above-mentioned dual-wavelength Raman probe.

[0025] By adopting the above technical solution and applying the above dual-wavelength Raman probe to a Raman spectrometer, the equipment cost can be reduced and the operation is convenient.

[0026] Preferably, it further comprises a first laser light source and a second laser light source, wherein the first laser light source is connected to the first laser module signal via a transmission optical fiber, and the second laser light source is connected to the second laser module signal via a transmission optical fiber.

[0027] By adopting the above technical solution, as a structural example, the first laser light source provides a laser beam of a first preset wavelength, for example, the first laser light source uses an existing 532nm laser; the second laser light source provides the above-mentioned laser beam of the first preset wavelength and the laser beam of the second preset wavelength, for example, the second laser light source uses an existing 785nm laser. The first laser light source and the second laser light source are respectively connected to the first laser module and the second laser module in sequence through transmission optical fibers.

[0028] Preferably, it also includes a spectrometer, and the spectrometer is connected to the fourth lens signal via a transmission optical fiber.

[0029] By adopting the above technical solution, as a structural example, a spectrometer is set up and connected to the fourth lens signal through a transmission optical fiber. The Raman signal in the fifth reflected light beam and the fifth transmitted light beam focused by the fourth lens is input into the spectrometer through the transmission optical fiber, thereby completing the spectral analysis.

[0030] In summary, this application has at least the following beneficial effects: The dual-wavelength Raman probe of the present application can integrate the Raman channels into a single spectral channel, and the dual-wavelength Raman signal can be collected through the single spectral channel; the Raman spectrometer of the present application only needs one spectrometer to analyze the dual-wavelength Raman signal. Therefore, the present application has the advantages of reducing costs, simplifying the overall equipment size, and simplifying equipment operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of a Raman spectrometer according to an embodiment of the present application; Figure 2 It is a schematic diagram of the structure of a dual-wavelength Raman probe according to an embodiment of the present application.

[0032] Description of labels: 11. a first dichroic mirror; 12. a first lens; 13. a first reflector; 14. a first filter; 21. second dichroic mirror; 22. second reflector; 23. third reflector; 24. second filter; 25. second lens; 31. a third dichroic mirror; 32. a third lens; 41. a fourth dichroic mirror; 42. a fourth lens; 43. a fourth reflector; 44. a third filter; 45. a fourth filter; 5. First laser light source; 6. Second laser light source; 7. Spectrometer; 8. Transmission optical fiber. DETAILED DESCRIPTION

[0033] Although the present application can be easily presented as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present application and is not intended to limit the present application to that described herein.

[0034] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the application, rather than implying that each embodiment of the application must have the described features. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used for other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0035] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the present application are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0036] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0037] Example 1 According to an implementation shown in this embodiment, the structure can be seen in Figure 1-2 , wherein the same reference numerals throughout the figure represent corresponding components. It should be understood that the dual-wavelength Raman probe and Raman spectrometer according to the present application can be applied to the collection and analysis of all dual-wavelength Raman signals, as well as the collection and analysis equipment of multi-wavelength Raman signals conceived under the present application.

[0038] For the convenience of description, in view of the fact that the dichroic mirror has two sides in opposite directions, one side of the first dichroic mirror, one side of the second dichroic mirror, one side of the third dichroic mirror, one side of the fourth dichroic mirror, and the other side of the first dichroic mirror, the other side of the second dichroic mirror, the other side of the third dichroic mirror, and the other side of the fourth dichroic mirror are used to describe the two relative directions of the first dichroic mirror, the second dichroic mirror, the third dichroic mirror, and the fourth dichroic mirror, respectively.

[0039] like Figure 1-2 As shown, the dual-wavelength Raman probe of this embodiment includes: a first laser module, a second laser module, a dual-wavelength acquisition module and a Raman filter module.

[0040] In this embodiment, as a specific example, the first preset wavelength laser beam is selected as a laser with a wavelength of 532nm, and the second preset wavelength laser beam is selected as a laser with a wavelength of 785nm. The first preset wavelength Raman signal corresponds to a 532nm Raman signal, and the second preset wavelength Raman signal corresponds to a 785nm Raman signal.

[0041] See also Figure 1 and Figure 2, the first laser module includes a first dichroic mirror 11, a first lens 12, a first reflector 13 and a first filter 14; the first lens 12, the first filter 14, the first reflector 13 and the first dichroic mirror 11 are respectively distributed in the direction of light beam transmission, and the first lens 12, the first filter 14 and the first reflector 13 are coaxially arranged. The external laser outputs 532nm laser to the first lens 12 through the transmission optical fiber. The first lens 12 is a collimating lens for collimating the laser. The first filter 14 is a 532nm laser line filter, which is 180° with the first lens 12 and is used to select laser light with a wavelength of 532nm and filter out unnecessary wavelengths. The first reflector 13 is a plane reflector, which is 45° with the first filter 14 and is used to reflect the laser so that the laser is emitted toward one side of the first dichroic mirror 11 (i.e., corresponding to the right side of the first dichroic mirror 11 in the figure). The first dichroic mirror 11 is 180° away from the first reflector 13 and is used to reflect 532nm laser and transmit 532nm Raman signal.

[0042] The second laser module includes a second dichroic mirror 21, a second lens 25, a second reflector 22, a third reflector 23, and a second filter 24. The second lens 25, the second filter 24, the second reflector 22, the second dichroic mirror 21, and the third reflector 23 are respectively distributed along the light beam transmission direction in sequence, and the second lens 25, the second filter 24, and the second reflector 22 are coaxially arranged. The external laser outputs 785nm laser to the second lens 25 through the transmission optical fiber, and the second lens 25 is a collimating lens for collimating the laser. The second filter 24 is a 785nm laser line filter, which is 180° with the first lens 12 and is used to select the laser light with a wavelength of 785nm and filter out unnecessary wavelengths. The second reflector 22 is a plane reflector, which is 45° with the second filter and is used to reflect the laser light so that the laser light is emitted toward one side of the second dichroic mirror 21 (i.e., corresponding to the right side of the second dichroic mirror in the figure). The second dichroic mirror 21 is 180° with the second reflector 22 and is used to reflect the 785nm laser light. The third reflector 23 is a plane reflector which is 180° away from the third dichroic mirror 31 and is used to reflect the 785nm laser and the 785nm Raman signal, so that the 785nm laser is emitted toward the other side of the third dichroic mirror 31 (i.e., the right side of the third dichroic mirror 31 in the figure), and the 785nm Raman signal is emitted toward one side of the second dichroic mirror 21 (i.e., the right side of the second dichroic mirror 21 in the figure).

[0043] The dual-wavelength acquisition module includes a coaxially arranged third dichroic mirror 31 and a third lens 32; the third dichroic mirror 31 is located on one side of the first dichroic mirror 11 (the right side of the first dichroic mirror 11 in the figure) and is also located on one side of the second dichroic mirror 21 (the right side of the second dichroic mirror 21 in the figure), and the third dichroic mirror 31 is 90° with the first dichroic mirror 11, and is used to transmit 532nm laser and 532nm Raman signal respectively and reflect 785nm laser and 785nm Raman signal respectively. The third lens 32 is located on the side of the third dichroic mirror 31 away from the first dichroic mirror 11 or the second dichroic mirror 21 (that is, the right side of the third dichroic mirror in the figure) and focuses the laser light respectively. The laser light is focused to the sample surface through the third lens 32, and the Raman signal scattered by the molecular interaction between the laser light and the sample is collimated through the third lens 32.

[0044] The Raman filter module includes a fourth dichroic mirror 41, a fourth lens 42, a fourth reflector 43, a third filter 44, and a fourth filter 45. The fourth dichroic mirror 41 and the fourth lens 42 are coaxially arranged. The third filter 44 is a 532nm long-wave pass filter, which is 45° with the fourth reflector 43, and is used to filter the 532nm laser signal and retain the Raman signal; the fourth filter 45 is a 785nm long-wave pass filter, which is 45° with the second dichroic mirror 21, and is used to filter the 785nm laser signal and retain the Raman signal. The fourth dichroic mirror 41 is located on the other side of the first dichroic mirror 11 (the left side of the first dichroic mirror 11 in the figure) and is also located on the other side of the second dichroic mirror 21 (the left side of the second dichroic mirror 21 in the figure), and is 45° with the third filter 44, and is used to reflect the 532nm Raman signal and transmit the 785nm Raman signal. The fourth lens 42 is located on a side of the fourth dichroic mirror 41 away from the first dichroic mirror or the second dichroic mirror (the left side of the fourth dichroic mirror 41 in the figure) and focuses the 532nm Raman signal and the 785nm Raman signal, that is, focuses the 532nm and 785nm Raman signals to the end face of the transmission optical fiber, and then inputs the Raman signals to an external spectrometer through the transmission optical fiber.

[0045] In this embodiment, as a specific example, the first lens 12, the second lens 25, the third lens 32, and the fourth lens 42 are all aspherical lenses. The first reflector 13, the second reflector 22, the third reflector 23, and the fourth reflector 43 are all silver-coated reflectors.

[0046] The specific parameters of the first filter 14 are: bandwidth 4nm, absorbance OD6, AOI: 0 degree; the specific parameters of the second filter 24 are: bandwidth 6nm, absorbance OD6, AOI: 0 degree; the specific parameters of the third filter 44 are: T%≥90%@535nm-724nm, OD6@530nm-532.5nm, AOI: 0 degree; the specific parameters of the fourth filter 45 are: T%≥90%@794nm-1050nmnm, OD6@784nm-786nm, AOI: 0 degree.

[0047] The specific parameters of the first dichroic mirror 11 are: AOI: 45 degrees, T% ≥ 90% @ 535nm-724nm, R% ≥ 95% @ 530nm-532.5nm; the specific parameters of the second dichroic mirror 21 are: AOI: 45 degrees, T% ≥ 90% @ 794nm-1050nm, R% ≥ 95% @ 784nm-786nm; the specific parameters of the third dichroic mirror 31 are: AOI: 45 degrees, R% ≥ 97% @ 760-1000nm, T% ≥ 98% @ 400-700nm; the specific parameters of the fourth dichroic mirror 41 are: AOI: 45 degrees, R% ≥ 95% @ 530-615nm, T% ≥ 97% @ 680-1100nm.

[0048] See also Figure 1 The Raman spectrometer of this embodiment includes: a dual-wavelength Raman probe, a first laser light source 5, a second laser light source 6 and a spectrometer 7. The first laser light source 5 uses a commercially available 532nm laser, which has an FC interface, which is coupled to a transmission optical fiber, and is connected to the first lens 12 by signal through a transmission optical fiber 8; the second laser light source 6 uses a commercially available 785nm laser, which has an FC interface, which is coupled to a transmission optical fiber 8, and is connected to the second lens 25 by signal through the transmission optical fiber 8; the spectrometer 7 can use any common commercial spectrometer, which is coupled to the transmission optical fiber 8 and the SMA interface, and then connected to the fourth lens 42 by signal, so as to input the first preset wavelength Raman signal and the second preset wavelength Raman signal into the spectrometer for signal analysis.

[0049] Based on the above structural description, the working principle of this embodiment is specifically described as follows: 532nm laser and 785nm laser are outputted by the first laser light source 5 and the second laser light source 6 in sequence respectively, and the first dichroic mirror 11 is arranged on the emission light path of the 532nm laser. The 532nm laser is reflected by the first dichroic mirror 11 (one side of the first dichroic mirror 11 receives the first preset wavelength laser beam and forms a reflected beam on one side of the first dichroic mirror 11, which is named as the first reflected beam for the convenience of description, the same below) to the third dichroic mirror 31, and then transmitted by the third dichroic mirror 31 (one side of the third dichroic mirror 31 receives the first reflected beam and forms the first transmitted beam on the other side of the third dichroic mirror 31) to the third lens 32. After being focused by the third lens 32, it is irradiated onto the sample to be tested, thereby forming a complete emission light path channel of the 532nm laser. Similarly, the second dichroic mirror 21 is arranged on the emission light path of the 785nm laser. The 785nm laser is reflected by the second dichroic mirror 21 (one side of the second dichroic mirror 21 receives the 785nm laser and forms a second reflected light beam on one side of the second dichroic mirror 21) to the third dichroic mirror 31, and then reflected by the third dichroic mirror 31 (the other side of the third dichroic mirror 31 receives the second reflected light beam and forms a third reflected light beam on the other side of the third dichroic mirror 31) to the third lens 32. After being focused by the third lens 32, it is irradiated onto the sample to be tested, thereby forming a complete emission light path channel of the 785nm laser.

[0050] On this basis, the first transmitted light beam is focused and irradiated onto the surface of the sample to be tested, and the 532nm Raman signal scattered by the molecular interaction between the laser and the sample is collimated by the third lens 32. The collimated 532nm Raman signal is sequentially transmitted through the third dichroic mirror 31 (the other side of the third dichroic mirror 31 receives the collimated 532nm Raman signal and forms a first transmission signal on one side of the third dichroic mirror 31), and then transmitted through the first dichroic mirror 11 (one side of the first dichroic mirror 11 receives the first transmission signal and forms a second transmission signal on the other side of the first dichroic mirror 11), and then irradiated onto the fourth dichroic mirror 41 (one side of the fourth dichroic mirror 41 receives the second transmission signal and forms a first reflection signal on one side of the fourth dichroic mirror 41), and then focused by the fourth lens 42 and connected to the spectrometer 7 signal, thereby forming a complete 532nm Raman signal collection channel.

[0051] Similarly, the third reflected light beam is focused and irradiated onto the sample to be tested, and the 785nm Raman signal scattered by the molecular interaction between the laser and the sample is collimated by the third lens 32. The collimated 785nm Raman signal is reflected by the third dichroic mirror 31 in sequence (the other side of the third dichroic mirror 31 receives the collimated 785nm Raman signal and forms a second reflected signal on the other side of the third dichroic mirror 31), and then transmitted through the second dichroic mirror 21 (one side of the second dichroic mirror 21 receives the second reflected signal and forms a third transmitted signal on the other side of the second dichroic mirror 21), and then irradiated onto the fourth dichroic mirror 41 (the other side of the fourth dichroic mirror 41 receives the third transmitted signal and forms a fourth transmitted signal on one side of the fourth dichroic mirror 41), and then focused by the fourth lens 42 and connected to the spectrometer 7 signal, thereby forming a complete 785nm Raman signal collection channel.

[0052] According to the above principle, under the excitation of dual-wavelength lasers of 532nm and 785nm, the 532nm laser passes through the first laser module and the dual-wavelength acquisition module, and the 532nm Raman signal scattered after irradiating the sample is finally focused to the external spectrometer through the Raman filter module for Raman signal analysis. At the same time, the 785nm laser passes through the second laser module and the dual-wavelength acquisition module, and another Raman signal (i.e., the second preset wavelength Raman signal) scattered after irradiating the sample is finally focused to the same external spectrometer through the Raman filter module for Raman signal analysis. Therefore, this embodiment can integrate the Raman channels into a single spectral channel, and the dual-wavelength Raman signal can be collected through the single spectral channel, and the dual-wavelength Raman signal analysis can be realized with only one spectrometer. It has the advantages of reducing costs, simplifying the overall equipment size, and simplifying equipment operation requirements.

[0053] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A dual-wavelength Raman probe, characterized in that: The system comprises a first laser module, a second laser module, a dual-wavelength acquisition module and a Raman filter module, wherein the first laser module comprises a first dichroic mirror, which is used to reflect a laser beam of a first preset wavelength and transmit a Raman signal of a first preset wavelength; the second laser module comprises a second dichroic mirror, which is used to reflect a laser beam of a second preset wavelength and transmit a Raman signal of a second preset wavelength; The dual-wavelength acquisition module includes a third dichroic mirror and a third lens. The third dichroic mirror is located on one side of the first dichroic mirror and on one side of the second dichroic mirror. The third dichroic mirror is used to transmit the first preset wavelength laser beam and the first preset wavelength Raman signal respectively and reflect the second preset wavelength laser beam and the second preset wavelength Raman signal respectively. The third lens is located on the side of the third dichroic mirror away from the first dichroic mirror and focuses the first preset wavelength laser beam and the second preset wavelength laser beam respectively. The third lens collimates the first preset wavelength Raman signal and the second preset wavelength Raman signal respectively. The Raman filter module includes a fourth dichroic mirror and a fourth lens. The fourth dichroic mirror is located on the other side of the first dichroic mirror and on the other side of the second dichroic mirror. The fourth dichroic mirror is used to reflect the first preset wavelength Raman signal and transmit the second preset wavelength Raman signal. The fourth lens is located on the side of the fourth dichroic mirror away from the first dichroic mirror and focuses the first preset wavelength Raman signal and the second preset wavelength Raman signal respectively.

2. The dual-wavelength Raman probe according to claim 1, characterized in that: The first laser module also includes a first lens, and the second laser module also includes a second lens. The first lens and the second lens are collimating lenses respectively. The first preset wavelength laser beam is emitted to one side of the first dichroic mirror via the first lens, and the second preset wavelength laser beam is emitted to one side of the second dichroic mirror via the second lens.

3. The dual-wavelength Raman probe according to claim 1 or 2, characterized in that: The first laser module further includes a first reflector, and the first reflector is used to reflect the first preset wavelength laser beam so that the first preset wavelength laser beam is emitted toward one side of the first dichroic mirror.

4. The dual-wavelength Raman probe according to claim 3, characterized in that: The first laser module further includes a first filter having a transmission wavelength consistent with the first preset wavelength laser beam, and the first preset wavelength laser beam is emitted to one side of the first dichroic mirror via the first filter.

5. The dual-wavelength Raman probe according to claim 1 or 2, characterized in that: The second laser module also includes a second reflector and / or a third reflector, the second reflector is used to reflect the second preset wavelength laser beam so that the second preset wavelength laser beam is emitted toward one side of the second dichroic mirror; the third reflector is used to respectively reflect the second preset wavelength laser beam and the second preset wavelength Raman signal so that the second preset wavelength laser beam is emitted toward the other side of the third dichroic mirror, and the second preset wavelength Raman signal is emitted toward one side of the second dichroic mirror.

6. The dual-wavelength Raman probe according to claim 5, characterized in that: The second laser module further includes a second filter having a transmission wavelength consistent with the second preset wavelength laser beam, and the second preset wavelength laser beam is emitted to one side of the second dichroic mirror via the second filter.

7. The dual-wavelength Raman probe according to claim 1 or 2, characterized in that: The Raman filter module also includes a fourth reflector, a third filter having a cutoff wavelength consistent with the first preset wavelength Raman signal, and a fourth filter having a cutoff wavelength consistent with the second preset wavelength Raman signal. The fourth reflector is located on the other side of the first dichroic mirror. The fourth reflector is used to reflect the first preset wavelength Raman signal so that the first preset wavelength Raman signal is emitted toward a side of the fourth dichroic mirror away from the first dichroic mirror; the third filter and the fourth filter are long-pass filters respectively, the first preset wavelength Raman signal is emitted to one side of the fourth dichroic mirror via the third filter, and the second preset wavelength Raman signal is emitted to the other side of the fourth dichroic mirror via the fourth filter.

8. A Raman spectrometer, characterized in that: The invention comprises the dual-wavelength Raman probe as described in any one of claims 1 to 7.

9. The Raman spectrometer according to claim 8, characterized in that: It also includes a first laser light source and a second laser light source. The first laser light source is connected to the first laser module signal through a transmission optical fiber, and the second laser light source is connected to the second laser module signal through a transmission optical fiber.

10. The Raman spectrometer according to claim 8 or 9, characterized in that: It also includes a spectrometer, which is connected to the fourth lens signal through a transmission optical fiber.

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