Spatial light excitation acquisition device for handheld Raman spectrometer

Abstract

The utility model discloses a space light excitation acquisition device for a hand-held Raman spectrometer, which comprises a laser acquisition module, a laser module and a Raman signal enhancement module, the laser acquisition module comprises a laser acquisition support, and a transverse light path channel and a longitudinal light path channel which are vertically crossed are arranged in the laser acquisition support. A dichroscope is mounted at the crossed position, and a narrow-band filter and an extinction cone are mounted in the transverse light path channel; a sample detection head is in threaded connection with one end of the longitudinal light path channel, a laser focusing lens is mounted in the end part, far away from the longitudinal light path channel, of the sample detection head, and a long-wave-pass optical filter and a Raman light acquisition lens are sequentially mounted in the other end of the longitudinal light path channel. According to the utility model, the Raman light acquisition lens is adopted to replace optical fiber coupling, so that the device is compact and reasonable; the laser passing through the sample bottle and the Raman scattering light scattering backwards can be collected and converged again, so that the finally measured Raman signal is multiplied; and the problem of fluorescence interference can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of spatial light excitation collection devices for handheld Raman spectrometer, belong 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 substance in sample bottle, most light will be reflected in the original direction, and a small part of light will have inelastic collision with molecule in substance, resulting in the frequency change of scattered light, and this phenomenon is Raman scattering.Instrument can obtain vibration, rotation and other information of substance molecule by collecting and analyzing the frequency change of these scattered light, and then deduce the composition and structure of substance.

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

[0004] 1. Optical fiber coupling is generally used, and the volume of optical fiber and optical fiber coupling component is large, resulting in low internal space utilization rate of spectrometer;

[0005] 2. Laser passing through sample bottle and Raman scattered light scattered backward cannot be effectively utilized, resulting in weak Raman signal collected finally;

[0006] 3. There is the problem of fluorescence interference in signal intensity when measuring liquid sample.

[0007] As can be seen from the above, the prior art obviously has inconvenience and defects in actual use, so it is necessary to improve. UTILITY MODEL CONTENT

[0008] The utility model provides a kind of spatial light excitation collection devices for handheld Raman spectrometer to the deficiency in background art, can use Raman light collection lens, instead of optical fiber coupling, so that device is more compact and reasonable;Laser passing through sample bottle and Raman scattered light scattered backward can be collected and converged again, so that Raman signal measured finally is multiplied;Fluorescence interference problem can also be effectively solved.

[0009] To solve the above technical problems, the utility model adopts the following technical solutions:

[0010] A kind of spatial light excitation collection device for handheld Raman spectrometer, including laser collection module, laser module and Raman signal enhancement module;Laser collection module includes laser collection support, laser collection support inside has the transverse and longitudinal light path channel of vertical intersection arrangement, is equipped with dichroic mirror at intersection position, is equipped with narrowband filter and light extinction cone in transverse light path channel;One end of longitudinal light path channel is connected with sample detection head inside screw thread, is equipped with laser focusing lens in the end of sample detection head away from longitudinal light path channel, long wave pass filter and Raman light collection lens are sequentially installed in the other end of longitudinal light path channel.

[0011] Further, laser module and Raman signal enhancement module are vertically arranged on the two sides of laser collection module.

[0012] Further, the laser module includes a spatial light butterfly laser and a laser driver board, and an exit end of the spatial light butterfly laser is connected with the laser collection module.

[0013] Further, the narrowband filter and the light extinction cone are located on the two sides of the dichroic mirror, and the narrowband filter is arranged on the side close to the laser module.

[0014] Further, the sample detection head and the long wave pass filter are located on the two sides of the dichroic mirror.

[0015] Further, the Raman signal enhancement module includes a signal enhancement support, the signal enhancement support is sleeved on the end of the sample detection head, and a rubber fixing member is arranged at the connection between the signal enhancement support and the sample detection head.

[0016] Further, the signal enhancement support is internally provided with a light path channel, an upper surface of the signal enhancement support is internally provided with a placing groove in communication with the light path channel, and the placing groove is used for placing a sample bottle.

[0017] Further, the signal enhancement support is internally provided with a light path channel, an upper surface of the signal enhancement support is internally provided with a placing groove in communication with the light path channel, and the placing groove is used for placing a sample bottle.

[0018] Further, the Raman enhancement mirror and the laser focusing lens are located on the two sides of the placing groove, and the focal length of the Raman enhancement mirror is equal to the focal length of the laser focusing lens and the Raman light collection lens.

[0019] Compared with the prior art, the above technical scheme has the following advantages:

[0020] The Raman light collection lens is used to replace the optical fiber coupling, reduce the light intensity loss caused by secondary optical fiber coupling, and because the optical fiber and the optical fiber coupling component are replaced, the Raman scattering light excitation collection device is more compact, and the volume is greatly reduced, which is of great significance for handheld Raman equipment with very tight internal space.

[0021] The utility model discloses adopt raman enhancement mirror, and the laser that has passed sample bottle and the raman scattering light scattering back are collected and converge again, make sample secondary excite raman signal and utilize the raman scattering light that goes back, make the raman signal that finally measures is multiplied;

[0022] The utility model discloses adopt confocal design, and raman signal excitation point, raman light focus point are in optical conjugate position, only raman scattering light from sample focal plane can enter spectral analysis module, and the stray light of defocus is blocked, realize the effect of optical sectioning, greatly improve the stability and consistency of detection point signal.

[0023] The utility model discloses in the following combined with the drawings and examples carries out detailed description. DRAWINGS

[0024] Figure 1 It is the structure schematic diagram of the utility model;

[0025] Figure 2 It is the structure sectional view of the utility model;

[0026] Figure 3 It is the use state diagram of the utility model;

[0027] Figure 4 It is the optical path schematic diagram of the utility model.

[0028] In the drawing, 1-laser acquisition module, 11-laser acquisition support, 12-dichroic mirror, 13-narrowband filter, 14-extinction cone, 15-sample detection head, 16-laser focusing lens, 17-long wave pass filter, 18-raman light acquisition lens;2-laser module, 21-space light butterfly laser, 22-laser driver board;3-raman signal enhancement module, 31-signal enhancement support, 32-putting groove, 33-raman enhancement mirror;4-rubber fixing piece, 5-sample bottle, 6-spectral analysis module. DETAILED DESCRIPTION

[0029] In order to have more clear understanding to the technical features, object and effect of the utility model, now to the drawing explanation specific implementation mode of the utility model.

[0030] As Figures 1-4 The utility model discloses a kind of spatial light excitation acquisition devices for handheld raman spectrometer, including laser acquisition module 1, laser module 2 and raman signal enhancement module 3, laser module 2 and raman signal enhancement module 3 are vertically arranged in the both sides of laser acquisition module 1.

[0031] The laser module 2 includes space light butterfly laser 21 and laser driver board 22, and the exit end of the space light butterfly laser 21 is connected with the laser acquisition module 1.

[0032] The laser acquisition module 1 comprises a laser acquisition support 11, the inside of the laser acquisition support 11 is provided with a transverse light path channel and a longitudinal light path channel which are arranged perpendicularly, and a dichroic mirror 12 is arranged at the intersection position of the transverse light path channel and the longitudinal light path channel.

[0033] The transverse light path channel is provided with a narrowband filter 13 and an extinction cone 14, the narrowband filter 13 and the extinction cone 14 are arranged on the two sides of the dichroic mirror 12, and the narrowband filter 13 is arranged on the side close to the laser module 2. Since the spatial optical butterfly laser 21 has high laser energy, part of the laser can pass through the dichroic mirror 12, and the stray light passing through the dichroic mirror 12 can be dissipated by the extinction cone 14.

[0034] One end of the longitudinal light path channel is provided with a sample detection head 15 which is connected in a threaded mode, the sample detection head 15 is provided with a laser focusing lens 16 at the end away from the longitudinal light path channel, the other end of the longitudinal light path channel is sequentially provided with a long-wave pass filter 17 and a Raman light acquisition lens 18, and the sample detection head 15 and the long-wave pass filter 17 are arranged on the two sides of the dichroic mirror 12.

[0035] The Raman signal enhancement module 3 comprises a signal enhancement support 31, the signal enhancement support 31 is arranged on the end of the sample detection head 15, and the connecting position of the signal enhancement support 31 and the sample detection head 15 is provided with a rubber fixing piece 4.

[0036] The signal enhancement support 31 is internally provided with a light path channel, and the upper surface of the signal enhancement support 31 is provided with a placing groove 32 which is connected with the light path channel, and the placing groove 32 is used for placing a sample bottle 5.

[0037] The light path channel of the signal enhancement support 31 is further provided with a Raman enhancement mirror 33, the Raman enhancement mirror 33 and the laser focusing lens 16 are arranged on the two sides of the placing groove 32, the focal length of the Raman enhancement mirror 33 is equal to the focal length of the laser focusing lens 16 and the Raman light acquisition lens 18, the focal point of the Raman enhancement mirror 33 is coincident with the focal point of the laser focusing lens 16 and is conjugate with the focal point (the position of a slit piece of a spectrometer) of the Raman light acquisition lens 18, and the focusing condition is met.

[0038] The specific working principle of the utility model is as follows:

[0039] The spatial light butterfly laser 21 emits collimated light through the 785nm narrowband filter 13, and the dichroic mirror 12 reflects the 785nm light to the sample detection head 15, and focuses on a center point of the sample bottle 5 through the laser focusing lens 16. Meanwhile, since the spatial light butterfly laser 21 emits high laser energy, part of the 785nm laser can pass through the dichroic mirror 12, and the stray light passing through the dichroic mirror 12 can be dissipated by the light extinction cone 14. The sample at the center of the sample bottle 5 generates Raman scattering light after excitation, and the collimated Raman scattering light (785~1100nm) can pass through the dichroic mirror 12, and then pass through the Raman special long-wave filter 17 for filtering, so as to filter out the high-energy 785nm excitation light reflected from the sample. The Raman scattering light filtered by the Raman special long-wave filter 17 is focused on the slit position by the Raman light collection lens 18, so that the Raman signal is received by the spectral analysis module 6.

[0040] The utility model discloses a Raman light collection lens, instead of fiber coupling, reduces the light intensity loss brought by secondary fiber coupling, and simultaneously, because of replacing the fiber and the fiber coupling part, the Raman scattering light excitation and collection device is more compact, and the volume is greatly reduced, which is of great significance for the handheld Raman equipment with very nervous internal space.

[0041] The utility model discloses a Raman enhancement mirror, which collects and converges the 785nm laser passing through the sample bottle and the Raman scattering light scattered backward, so that the sample excites the Raman signal twice and utilizes the backward Raman scattering light, and the Raman signal measured finally is doubled.

[0042] The utility model discloses a confocal design, and the Raman signal excitation point (sample detection point) and the Raman light focusing point (spectrometer slit position) are in optical conjugate position, only the Raman scattering light from the sample focal plane (laser focal point) can enter the spectral analysis module, and the defocused stray light (such as fluorescence) is blocked, the effect of optical sectioning is realized, and the stability and consistency of the detection point signal are greatly improved.

[0043] The above is an example of the best implementation of the utility model, wherein the parts not described in detail are the common knowledge of ordinary technical personnel in the art. The protection scope of the utility model is subject to the content of the claims, 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 spatially light excited collection device for a handheld Raman spectrometer, characterized in that: It comprises a laser acquisition module (1), a laser module (2) and a Raman signal enhancement module (3); the laser acquisition module (1) comprises a laser acquisition support (11), the laser acquisition support (11) is internally provided with a transverse and longitudinal light path channel arranged perpendicularly and crossly, a dichroic mirror (12) is installed at the cross position, a narrow-band filter (13) and an extinction cone (14) are installed in the transverse light path channel; a sample detection head (15) is threadedly connected to one end of the longitudinal light path channel, a laser focusing lens (16) is installed in the end of the sample detection head (15) far away from the longitudinal light path channel, a long-wave pass filter (17) and a Raman light acquisition lens (18) are sequentially installed in the other end of the longitudinal light path channel.

2. A spatially focused collection device for a handheld Raman spectrometer as recited in claim 1, wherein: The laser module (2) and the Raman signal enhancement module (3) are arranged perpendicularly on the two sides of the laser acquisition module (1).

3. A spatially focused collection device for a handheld Raman spectrometer as defined in claim 1, wherein: The laser module (2) comprises a spatial light butterfly laser (21) and a laser driver board (22), and the exit end of the spatial light butterfly laser (21) is connected with the laser acquisition module (1).

4. A spatially focused collection device for a handheld Raman spectrometer as defined in claim 1, wherein: The narrow-band filter (13) and the extinction cone (14) are located on the two sides of the dichroic mirror (12), and the narrow-band filter (13) is arranged on the side close to the laser module (2).

5. A spatially focused collection device for a handheld Raman spectrometer as defined in claim 1, wherein: The sample detection head (15) and the long-wave pass filter (17) are located on the two sides of the dichroic mirror (12).

6. A spatially focused collection device for a handheld Raman spectrometer as defined in claim 1, wherein: The Raman signal enhancement module (3) comprises a signal enhancement support (31), the signal enhancement support (31) is sleeved on the end of the sample detection head (15), and a rubber fixing piece (4) is arranged at the connection position of the signal enhancement support (31) and the sample detection head (15).

7. A spatially focused collection device for a handheld Raman spectrometer according to claim 6, wherein: An optical path channel is arranged in the signal enhancement support (31), and a placing groove (32) in communication with the optical path channel is arranged on the upper surface of the signal enhancement support (31), and the placing groove (32) is used for placing a sample bottle (5).

8. A spatially focused collection device for a handheld Raman spectrometer according to claim 7, wherein: A Raman enhancement mirror (33) is further installed in the optical path channel of the signal enhancement support (31).

9. A spatially focused collection device for a handheld Raman spectrometer according to claim 8, wherein: The Raman enhancement mirror (33) and the laser focusing lens (16) are located on the two sides of the placing groove (32), and the focal length of the Raman enhancement mirror (33) is equal to the focal length of the laser focusing lens (16) and the Raman light acquisition lens (18).

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