Liquid signal enhancement device for handheld Raman spectrometer

Abstract

The utility model discloses a liquid signal enhancement device for a handheld Raman spectrometer, which comprises a signal enhancement support, a light path channel is arranged in the signal enhancement support along the length direction of the signal enhancement support, and a placing groove communicated with the light path channel is arranged in the upper surface of the signal enhancement support; one end of the light path channel is communicated with the Raman probe mounting hole, a Raman probe is arranged in the Raman probe mounting hole in a penetrating manner, and a laser focusing lens is mounted in the end part of the Raman probe; the other end of the light path channel is communicated with the threaded mounting hole, a Raman enhanced reflecting mirror is arranged in the threaded mounting hole, the focal length of the Raman enhanced reflecting mirror is equal to that of the laser focusing lens, and the focal point of the Raman enhanced reflecting mirror coincides with the focal point of the laser focusing lens at the center of the placing groove. According to the liquid signal enhancement device provided by the utility model, when the Raman signal intensity of a liquid sample is measured, the intensity of a characteristic peak can be doubled, fluorescence interference can be inhibited, and the application scene of a Raman spectrometer is widened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a liquid signal enhancement device for handheld Raman spectrometer belongs to Raman spectrometer technical field. BACKGROUND

[0002] The technical principle of handheld Raman spectrometer is based on Raman scattering effect. When laser beam irradiates to the surface of the substance in sample bottle, most of light will be reflected in the original direction, and a small part of light will have inelastic collision with the molecules in the substance, and the frequency of scattered light changes, and this phenomenon is Raman scattering. The instrument can obtain the vibration, rotation and other information of the molecules of the substance by collecting and analyzing the frequency change of the scattered light, and then deduce the composition and structure of the substance.

[0003] The handheld Raman spectrometer in prior art has the following technical problems in practice:

[0004] The laser passing through the sample bottle and the Raman scattering light scattering backward cannot be effectively utilized, resulting in that the Raman signal intensity collected finally is weak. In addition, when measuring the Raman signal intensity of liquid sample, there is the problem of fluorescence interference, which limits the application scene of the portable Raman spectrometer.

[0005] Therefore, it is necessary to improve the prior art. CONTENT OF THE UTILITY MODEL

[0006] The utility model provides a liquid signal enhancement device for handheld Raman spectrometer in response to the deficiency in the background art, which can double the characteristic peak intensity and suppress the fluorescence interference when measuring the Raman signal intensity of liquid sample, and widen the application scene of the Raman spectrometer.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme:

[0008] A liquid signal enhancement device for handheld Raman spectrometer, comprising a signal enhancement support, an optical path channel is arranged inside the signal enhancement support along the length direction thereof, and a placing groove in communication with the optical path channel is arranged on the upper surface of the signal enhancement support;

[0009] One end of the optical path channel is in communication with a Raman probe mounting hole, a Raman probe is arranged in the Raman probe mounting hole, and a laser focusing lens is arranged at the end of the Raman probe;

[0010] The other end of the optical path channel is in communication with a threaded mounting hole, a Raman enhancement mirror is arranged in the threaded mounting hole, the focal length of the Raman enhancement mirror is equal to the focal length of the laser focusing lens, and the focal point of the Raman enhancement mirror coincides with the focal point of the laser focusing lens.

[0011] Further, the optical path channel is arranged in line with the center line of the Raman probe mounting hole and the threaded mounting hole.

[0012] Further, the optical path channel is arranged in line with the center line of the Raman probe mounting hole and the threaded mounting hole.

[0013] Further, the laser focusing lens is fixed in the end of the Raman probe in the Raman probe mounting hole.

[0014] Further, the threaded mounting hole is mounted with a mirror holder, and the Raman enhancement mirror is embedded in the end of the mirror holder close to the end of the optical path channel.

[0015] Further, the outer end surface of the mirror holder is provided with a screw groove.

[0016] Further, the threaded mounting hole is provided with a fastening hole in communication therewith, the center line of the fastening hole is arranged perpendicularly intersecting the center line of the threaded mounting hole, and a jackscrew for fixing the position of the mirror holder is mounted in the fastening hole.

[0017] The above technical scheme is adopted in the utility model, compared with the prior art, has the following advantages:

[0018] The laser focusing lens focuses the 785nm laser on the center position of the sample bottle, the first excited Raman signal is immediately collected, the 785nm laser is focused again by the Raman enhancement mirror after passing through the sample bottle, the sample in the sample bottle is secondarily excited by the laser reflected by the Raman enhancement mirror, the second excited Raman signal is collected again, and the backward Raman scattering signals generated by the two excitation are also collected by the Raman enhancement mirror, so that the Raman signal is doubled and enhanced;

[0019] In the utility model, the focal point of the Raman enhancement mirror coincides with the focal point of the laser focusing lens at the center of the sample bottle, and is conjugate with the focal point of the Raman light collection lens, the confocal condition is met, so that only the light passing through the focal point at the center of the sample bottle can enter the Raman spectrometer, only the effective Raman light signal enters the spectrometer, the fluorescence interference from the non-focal plane is reduced, and the application scene of the Raman spectrometer is widened.

[0020] The utility model will be explained in detail in connection with the drawings and examples. DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the utility model;

[0022] Figure 2 It is the structure schematic diagram of the utility model along another direction;

[0023] Figure 3 It is the structure sectional view of the utility model;

[0024] Figure 4 is a schematic view of the sample bottle;

[0025] Figure 5 is a schematic view of the utility model in use state;

[0026] Figure 6 is a schematic view of the light path of the utility model.

[0027] In the figure, 1 is a signal enhancement support, 2 is a light path channel, 3 is a placing groove, 4 is a Raman probe mounting hole, 5 is a threaded mounting hole, 6 is a mirror holder, 7 is a Raman enhancement mirror, 8 is a fastening hole, 9 is a sample bottle, 10 is a Raman probe, and 11 is a laser focusing lens. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation mode of the utility model will be described with reference to the drawings.

[0029] As Figures 1-6 The utility model provides a liquid signal enhancement device for handheld Raman spectrometer, including signal enhancement support 1, signal enhancement support 1 inside is equipped with light path channel 2 along its length direction, the upper surface of signal enhancement support 1 is equipped with the placing groove 3 with the light path channel intercommunication, and the placing groove 3 is used for the longitudinal placement of sample bottle 9.

[0030] One end of the light path channel 2 is in communication with the Raman probe mounting hole 4, and a step is provided at the communication position. The other end of the light path channel 2 is in communication with the threaded mounting hole 5, and a step is provided at the communication position. The center lines of the light path channel 2, the Raman probe mounting hole 4 and the threaded mounting hole 5 are arranged in a collinear manner.

[0031] The Raman probe 10 is arranged in the Raman probe mounting hole 4. The laser focusing lens 11 is fixedly arranged at the end of the Raman probe mounting hole 4.

[0032] The mirror holder 6 is arranged in the threaded mounting hole 5. The Raman enhancement mirror 7 is embedded in the end of the mirror holder 6 close to the light path channel 2. The Raman enhancement mirror 7 is arranged in the threaded mounting hole 5 through the mirror holder 6.

[0033] The focal length of the Raman enhancement mirror 7 is equal to the focal length of the laser focusing lens 11. The focal point of the Raman enhancement mirror 7 coincides with the focal point of the laser focusing lens 11.

[0034] A screw groove is arranged in the outer end surface of the mirror holder 6, so that the mirror holder 6 and the Raman enhancement mirror 7 can be conveniently installed in place.

[0035] The side of the threaded mounting hole 5 is provided with a fastening hole 8 communicated with the threaded mounting hole 5, the center line of the fastening hole 8 is perpendicularly crossed with the center line of the threaded mounting hole 5, and a top screw for fixing the position of the frame 6 is mounted in the fastening hole 8.

[0036] The specific working principle of the utility model is as follows:

[0037] The utility model needs to cooperate with the Raman space light collection device, the Raman space light collection device focuses the laser of 785nm on the center position of sample bottle 9 through the laser focusing lens 11 of Raman probe 10, the Raman signal of first excitation is immediately collected by Raman space light collection device at this time, and the laser of 785nm is focused again by Raman enhancement mirror 7 after passing through sample bottle 9, the focal point of Raman enhancement mirror 7 also is located at the center position of sample bottle 9, the sample in sample bottle 9 is secondarily excited by the laser reflected by Raman enhancement mirror 7 at this time, the Raman signal of second excitation is collected by Raman space light collection device again at this time, and the Raman scattering signal generated by twice excitation is also collected by Raman enhancement mirror 7, thereby realizing that Raman signal is doubled and enhanced.

[0038] The focal point of Raman enhancement mirror in the utility model is coincided with the focal point of laser focusing lens in the center of sample bottle, and is conjugate with the focal point of Raman light collection lens (spectrum analyzer slit piece position), satisfies the condition of common focusing, thereby make only the light that passes through the focal point of the center of sample bottle can enter Raman spectrometer, only make effective Raman light signal enter the spectrometer, reduce the fluorescence interference from non focal plane.

[0039] The above is the example of the best implementation of the utility model, wherein the part not described in detail is the common knowledge of the person skilled in the art. The protection scope of the utility model is accurate with the content of claim, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A liquid signal enhancement device for a handheld Raman spectrometer, characterized by: The signal enhancement support (1) is internally provided with an optical path channel (2) along the length direction thereof, and the upper surface of the signal enhancement support (1) is internally provided with a placing groove (3) in communication with the optical path channel; One end of the optical path channel (2) is in communication with a Raman probe mounting hole (4), the Raman probe mounting hole (4) is internally provided with a Raman probe (10), and the end portion of the Raman probe (10) is internally mounted with a laser focusing lens (11); The other end of the optical path channel (2) is in communication with a threaded mounting hole (5), the threaded mounting hole (5) is internally provided with a Raman enhancement mirror (7), the focal length of the Raman enhancement mirror (7) is equal to the focal length of the laser focusing lens (11), and the focal point of the Raman enhancement mirror (7) coincides with the focal point of the laser focusing lens (11) at the center of the placing groove (3).

2. A liquid signal enhancement device for a handheld Raman spectrometer according to claim 1, wherein: The center lines of the optical path channel (2), the Raman probe mounting hole (4) and the threaded mounting hole (5) are arranged in a same line.

3. A liquid signal enhancement device for a handheld Raman spectrometer as defined in claim 1, wherein: The communication positions of the optical path channel (2), the Raman probe mounting hole (4) and the threaded mounting hole (5) are all provided with steps.

4. A liquid signal enhancement device for a handheld Raman spectrometer as defined in claim 1, wherein: The laser focusing lens (11) is fixed to the end portion of the Raman probe (10) in the Raman probe mounting hole (4).

5. A liquid signal enhancement device for a handheld Raman spectrometer as defined in claim 1, wherein: The threaded mounting hole (5) is internally mounted with a mirror holder (6), and the end portion of the mirror holder (6) close to the optical path channel (2) is internally embedded with the Raman enhancement mirror (7).

6. A liquid signal enhancement device for a handheld Raman spectrometer as claimed in claim 5, wherein: The outer end surface of the mirror holder (6) is internally provided with a screw groove.

7. A liquid signal enhancement device for a handheld Raman spectrometer as claimed in claim 6, wherein: The side portion of the threaded mounting hole (5) is provided with a fastening hole (8) in communication therewith, the center line of the fastening hole (8) is arranged in perpendicular intersection with the center line of the threaded mounting hole (5), and the fastening hole (8) is internally mounted with a jackscrew for fixing the position of the mirror holder (6).

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