Probe for enhancing Raman signal and handheld Raman spectrometer
By incorporating an optical path focusing unit and a confocal concave reflector within the probe, the problems of low signal collection efficiency and insufficient detection sensitivity of traditional probes are solved, enabling efficient detection of samples with low concentrations or weak signals.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional handheld Raman spectrometers have low probe signal collection efficiency and insufficient detection sensitivity, making it difficult to effectively detect samples with low concentrations or weak Raman signals.
An optical path focusing unit and a concave reflector are set inside the probe. The focal point of the concave reflector is confocal with the focal point of the optical path focusing unit, which is used to collect and focus scattered light to enhance signal strength.
It significantly improves signal collection efficiency and detection sensitivity, and enhances the ability to detect samples with low concentrations or weak signals.
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Figure CN224095695U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of spectrum analysis technique more particularly, relate to a kind of probe and hand-held raman spectrometer of enhanced raman signal. BACKGROUND
[0002] Hand-held raman spectrometer is widely used in rapid detection in situ due to its portability and easy operation. However, the probe of traditional hand-held raman spectrometer usually has the following shortcomings:
[0003] Low signal collection efficiency: Raman scattered light is weak and divergent, and it is difficult to efficiently collect signals.
[0004] Insufficient detection sensitivity: For low-concentration samples or samples with weak Raman signals, the detection sensitivity of the traditional probe is limited, and it is difficult to obtain clear Raman spectrum.
[0005] Therefore, there is an urgent need for a probe to enhance Raman signals to solve the problem of low collection efficiency and weak detection sensitivity of the probe of the current hand-held raman spectrometer. SUMMARY
[0006] In view of the above problems, the utility model provides a probe to enhance Raman signals and a hand-held raman spectrometer, which can solve the above problems.
[0007] In order to achieve the above purpose, the utility model provides a probe to enhance Raman signals, comprising:
[0008] A housing is provided with an opening on one side for placing a sample;
[0009] An optical path focusing unit is provided in the housing for receiving excitation light and focusing the excitation light onto the sample surface;
[0010] A concave mirror is provided in the housing for collecting scattered light generated by focusing excitation light onto the sample surface, and the concave mirror focuses the scattered light onto the optical path focusing unit;
[0011] The focal point of the concave mirror is confocal with the focal point of the optical path focusing unit;
[0012] The optical path focusing unit and the concave mirror are oppositely arranged relative to the opening.
[0013] As a further scheme of the utility model: the concave mirror collects the scattered light to form a signal collection optical path for improving signal strength.
[0014] As a further scheme of the utility model: the concave mirror focuses the scattered light to the focus point of the light path focusing unit, forms the excitation light path for improving the excitation light intensity of focus point position.
[0015] As a further scheme of the utility model: the light path focusing unit is provided with a lens, the concave mirror is vertically arranged in the shell, and the reflecting surface of the concave mirror is oppositely arranged with the lens relative to the sample, for collecting and focusing the scattered light.
[0016] As a further scheme of the utility model: the shell comprises:
[0017] The light path channel, the focusing chamber and the mounting groove are sequentially communicated, the lens is vertically arranged at the communication place of the focusing chamber and the light path channel, the excitation light is transmitted to the lens through the light path channel, and the excitation light is focused in the focusing chamber through the lens, and the light path inlet and outlet are arranged on the side wall of the focusing chamber for emitting the excitation light.
[0018] As a further scheme of the utility model: the concave mirror is vertically arranged at the communication place of the mounting groove and the focusing chamber, for collecting and focusing the scattered light.
[0019] As a further scheme of the utility model: further comprising a fixing part, the fixing part is connected and fixed with the top end of the mounting groove, for fixing the concave mirror.
[0020] As a further scheme of the utility model: the diameter of the concave mirror is 10-18mm, and the curvature radius is 20-50mm, the diameter of the lens is 6.5-18mm, and the focal length is 5-25mm.
[0021] As a further scheme of the utility model: the diameter of the shell is 12-20mm, and the length is 50-100mm.
[0022] As another improved scheme of the utility model: a handheld Raman spectrometer is used for coupling with the probe for enhancing Raman signal.
[0023] The technical effect of the utility model:
[0024] 1, the application is through setting up the light path focusing unit in the shell, and additionally setting up the concave mirror, the concave mirror can collect greater angle Raman scattered light, and has focusing characteristic, can reflect and focus the scattered Raman signal to the sample, significantly enhances signal intensity, and then reaches the effect of improving the detection sensitivity of low concentration or weak signal sample.
[0025] 2, the application focuses the focal point of the concave mirror and the focal point of the optical path focusing unit, the excitation light is focused to the sample surface through the focusing lens, and the focusing characteristics of the concave mirror can be used to re-converge the scattered laser to the focal point of the optical path focusing unit, enhance the laser intensity at the focal point position, and improve the collection efficiency of the Raman signal.
[0026] 3, the lens and the concave mirror are installed in the shell and coupled with the handheld Raman spectrometer, meet the ergonomic design, and are convenient for handheld operation. BRIEF DESCRIPTION OF DRAWINGS
[0027] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:
[0028] Figure 1 is a sectional view of the probe for enhancing the Raman signal in the present application.
[0029] Figure 2 is a schematic view of the focal point of the concave mirror and the focal point of the optical path focusing unit in the present application.
[0030] Figure 3 is a schematic view of the optical path principle of the probe for enhancing the Raman signal in the present application.
[0031] Figure 4 is a comparison diagram of the intensity of the Raman signal tested by the probe for enhancing the Raman signal and the conventional probe in the present application.
[0032] Figure 5 is a schematic view of the overall structure of the probe for enhancing the Raman signal coupled with the handheld Raman spectrometer in the present application.
[0033] In the drawings, the reference signs are:
[0034] 1, the shell; 11, the optical path channel; 12, the focusing chamber; 121, the optical path inlet and outlet; 13, the mounting groove; 2, the optical path focusing unit; 21, the lens; 3, the concave mirror; 4, the fixed part; F, the focal point; 10, the probe; 20, the sample. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.
[0036] In the description of the utility model, it needs to explain, the term "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the limitation of the utility model.
[0037] In the description of the utility model, it needs to explain, unless otherwise explicitly provided and limited, the term "installation", "connection", "connect" should be broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected;Can be mechanical connection, can be electrical connection;Can be directly connected, can be indirectly connected through the intermediate medium。For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.
[0038] Below, referring to Figures 1 to 4 , the structure of a kind of probe for enhancing raman signal and handheld raman spectrometer in some embodiments of the utility model is described in detail, wherein, Figure 1 It is the sectional view of a kind of probe for enhancing raman signal in the utility model; Figure 2 It is the schematic diagram that the focal point of the concave mirror and the focal point of optical path focusing unit are confocal in the utility model; Figure 3 It is the schematic diagram of optical path principle of the probe for enhancing raman signal of the utility model; Figure 4 It is the intensity comparison diagram of raman signal tested by the probe for enhancing raman signal of the utility model and conventional probe. Figure 5 It is the overall structure schematic diagram of the probe for enhancing raman signal and handheld raman spectrometer coupling in the utility model.
[0039] Please refer to Figure 1 A specific embodiment of a kind of probe for enhancing raman signal, the probe for enhancing raman signal is used to solve the deficiency of the probe of traditional handheld raman spectrometer, traditional probe is usually weak and divergent because of raman scattering light, leading to low signal collection efficiency, traditional probe for low concentration sample or raman signal weak sample, detection sensitivity is limited, it is difficult to obtain clear raman spectrum, the probe for enhancing raman signal of the application solves the above-mentioned problem.
[0040] As Figure 1As shown, a probe for enhancing Raman signals includes a housing 1 with a sample opening on one side, and an optical focusing unit 2 disposed within the housing 1. The optical focusing unit 2 is used to receive excitation light and focus the excitation light onto the sample surface. At this time, the sample surface will diffusely reflect the excitation light to generate scattered light. A concave mirror 3 is disposed within the housing 1. The concave mirror 3 is used to collect the scattered light generated by focusing the excitation light onto the sample surface. The concave mirror 3 focuses the scattered light onto the optical focusing unit 2, and the focal point F of the concave mirror 3 is confocal with the focal point F of the optical focusing unit 2.
[0041] Specifically, such as Figure 2 As shown, the concave reflector 3 can effectively collect scattered light from a larger angle, fully collect the scattered light, and utilize the focusing characteristics of the concave reflector 3 to refocus the scattered light on the sample surface and reflect it onto the optical path focusing unit 2 to improve the signal intensity.
[0042] It should be noted that the excitation light in this application is a laser emitted by a laser (not shown in the figure) as the light source. Preferably, the laser is placed in a handheld Raman spectrometer. The laser can also be a small semiconductor laser. This application does not impose specific restrictions on the laser and the light source emitted by the laser, as long as it can achieve the effect of irradiating the sample surface with excitation light and generating Raman scattered light.
[0043] Specifically, such as Figure 2 and Figure 3 As shown, the concave mirror 3 collects the Raman light scattered by the sample and focuses it to the focal point F of the optical path focusing unit 2, forming a signal collection optical path to improve the signal intensity. After the excitation light shines on the surface of the sample 20 through the optical path focusing unit 2, it generates scattered light (scattered light is divided into elastic scattering and inelastic scattering, of which Raman light is inelastic scattering). The Raman light diverges in all directions, and the concave mirror 3 collects the Raman light at a larger angle and in more directions through the concave curved surface. By utilizing the focusing characteristics of the concave mirror 3, the Raman light is concentrated on the focal point F of the optical path focusing unit 2, thereby improving the signal intensity.
[0044] Specifically, such as Figure 2 and Figure 3 As shown, the concave mirror 3 focuses the scattered excitation light to the focal point F of the optical path focusing unit 2, forming an excitation optical path to increase the excitation light intensity at the focal point F; the concave mirror 3 re-converges the scattered excitation light to the focal point F of the optical path focusing unit 2, and the excitation light is focused onto the surface of the sample 20 by the optical path focusing unit 2, thereby increasing the excitation light intensity at the focal point of the optical path focusing unit 2.
[0045] It is understandable that the optical path focusing unit 2 is set as lens 21, and the concave mirror 3 is vertically set inside the housing 1, with the reflecting surface of the concave mirror 3 facing the lens 21. It is used to collect and focus the scattered excitation light / Raman light. By adjusting the curvature of the reflecting surface of the concave mirror 3, the excitation light / Raman light at a large angle is collected and the collected excitation light / Raman light is focused onto the focal point F of the lens 21.
[0046] It should be noted that, in addition to lens 21, the optical path focusing unit 2 can also use aspherical lenses or other optical components that can achieve focusing function.
[0047] like Figure 1 As shown, the housing 1 includes an optical path channel 11, a focusing chamber 12, and a mounting groove 13 connected in sequence. The lens 21 is vertically mounted at the connection between the focusing chamber 12 and the optical path channel 11. The excitation light is transmitted to the lens 21 through the optical path channel 11 and focused into the focusing chamber 12 by the lens 21. The focusing chamber 12 has an optical path inlet and outlet 121 on its side wall for emitting the excitation light.
[0048] Specifically, the housing 1 is configured as the probe shell of the probe for enhancing the Raman signal. The housing 1 has a hollow cylindrical structure. Inside the housing 1, there are sequentially connected optical path channel 11, focusing chamber 12 and mounting groove 13. The optical path channel 11 inside the housing 1 is used to focus the excitation light emitted by the external laser into the focusing chamber 12 through the lens 21.
[0049] Preferably, the opening on the circumferential wall of the focusing chamber 12 is the optical path inlet / outlet 121. The optical path inlet / outlet 121 can be opened radially along the focusing chamber 12 or axially along the focusing chamber 12. Both the excitation light and the diffusely reflected Raman light enter and exit the focusing chamber 12 through the optical path inlet / outlet 121.
[0050] like Figure 1 As shown, the concave reflector 3 is vertically arranged at the connection between the mounting groove 13 and the focusing chamber 12, and is used to collect and focus Raman light. The probe that enhances the Raman signal also includes a fixing part 4, which is connected and fixed to the top of the mounting groove 13, and is used to fix the concave reflector 3 in the mounting groove 13.
[0051] It is understandable that the fixing part 4 is set as a cylindrical geometric structure that matches the mounting groove 13. The outer circumference of the fixing part 4 may be provided with a threaded structure, and the mounting groove 13 is also provided with a threaded structure that engages with the fixing part 4. The fixing part 4 and the mounting groove 13 are fixed by the threaded connection to fix the concave reflector 3.
[0052] In one embodiment, the concave reflector 3 used in the probe for enhancing the Raman signal has a diameter of 10 mm and a radius of curvature of 25 mm, the lens 21 has a diameter of 8 mm and a focal length of 5.9 mm, and the housing 1 is made of aluminum alloy with a diameter of 12 mm and a length of 100 mm.
[0053] In one embodiment, such as Figure 4 and Figure 5 As shown, the probe 10 that enhances the Raman signal can be used as a probe for a handheld Raman spectrometer. The probe is coupled to the handheld Raman spectrometer, which integrates a micro laser, a spectral detector, and a data processing module, and supports real-time on-site detection.
[0054] This Raman signal enhancement probe uses a miniature laser from a handheld Raman spectrometer as the excitation source to generate excitation light, enabling rapid sample detection and significantly enhancing signal intensity. Specific effects include... Figure 4 The probe shown to enhance the Raman signal has more than twice the intensity of the Raman signal compared to existing conventional probes, thus solving the problems of low Raman signal collection efficiency and weak detection sensitivity of current handheld Raman spectrometer probes.
[0055] Although exemplary embodiments of the present invention have been shown in the foregoing disclosure, it should be noted that various changes and modifications can be made without departing from the scope defined by the claims. Furthermore, while the elements of the present invention may be described or claimed individually, it is also contemplated that multiple elements may be included, unless explicitly limited to a single element.
[0056] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A probe for enhancing Raman signals, characterized in that, include: A housing, wherein one side of the housing has an opening for placing a sample; An optical path focusing unit is disposed inside the housing and is used to receive excitation light and focus the excitation light onto the sample surface; A concave mirror is disposed inside the housing and is used to collect scattered light generated by the excitation light being focused onto the sample surface. The concave mirror focuses the scattered light onto the optical path focusing unit. The focal point of the concave mirror is confocal with the focal point of the optical path focusing unit; The optical path focusing unit and the concave reflector are arranged opposite to the opening.
2. The probe for enhancing Raman signals according to claim 1, characterized in that, The concave reflector collects the scattered light, forming a signal collection optical path to improve signal strength.
3. The probe for enhancing Raman signals according to claim 1, characterized in that, The concave reflector focuses the scattered light to the focal point of the optical path focusing unit, forming an excitation optical path to increase the excitation light intensity at the focal point.
4. The probe for enhancing Raman signals according to any one of claims 1 to 3, characterized in that, The optical path focusing unit is configured as a lens, and the concave reflector is vertically disposed inside the housing. The reflecting surface of the concave reflector is positioned opposite to the lens relative to the sample, and is used to collect and focus the scattered light.
5. The probe for enhancing Raman signals according to claim 4, characterized in that, The housing includes: The optical path channel, focusing chamber, and mounting slot are connected in sequence. The lens is vertically mounted at the connection between the focusing chamber and the optical path channel. The excitation light is transmitted to the lens through the optical path channel and focused into the focusing chamber by the lens. The focusing chamber has an optical path inlet and outlet on its side wall for emitting the excitation light.
6. The probe for enhancing Raman signals according to claim 5, characterized in that, The concave reflector is vertically positioned at the connection between the mounting groove and the focusing chamber, and is used to collect and focus the scattered light.
7. The probe for enhancing Raman signals according to claim 5, characterized in that, It also includes a fixing part, which is connected and fixed to the top of the mounting groove for fixing the concave reflector.
8. The probe for enhancing Raman signals according to claim 4, characterized in that, The concave reflector has a diameter of 10–18 mm and a radius of curvature of 20–50 mm, while the lens has a diameter of 6.5–18 mm and a focal length of 5–25 mm.
9. The probe for enhancing Raman signals according to claim 8, characterized in that, The diameter of the shell is set to 12-20 mm and the length is set to 50-100 mm.
10. A handheld Raman spectrometer, characterized in that, For coupling with the probe for enhancing Raman signals as described in any one of claims 1 to 9.