CN205449805U - Surface reinforcing raman spectroscopy test system - Google Patents
Surface reinforcing raman spectroscopy test system Download PDFInfo
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- CN205449805U CN205449805U CN201620230706.1U CN201620230706U CN205449805U CN 205449805 U CN205449805 U CN 205449805U CN 201620230706 U CN201620230706 U CN 201620230706U CN 205449805 U CN205449805 U CN 205449805U
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Abstract
The utility model provides a surface reinforcing raman spectroscopy test system, relates to the spectrum detection technique field, and that solve is the technical problem who improves detectivity. This system includes grating spectrometer, laser lamp -house, detection probe, surface reinforcing sampling module, it swashs luminous optical fiber head, light source side collimating lens, shortwave including the raman and leads to light filter, narrow band pass filter, 45 degrees holophote, 45 degrees double -colored light filters, long wave pass filter, focusing lens, raman receipt optical fiber head to survey the probe, surface reinforcing sampling module includes coupling lens, laser entry optical fiber head, laser emitting optical fiber head, surface reinforcing metal level. The system provided by the utility model, can be used for detecting humble concentration sample.
Description
Technical field
This utility model relates to spectrum detection technique, particularly relates to the technology of a kind of surface enhanced formula Raman light spectrum testing system.
Background technology
The photon of exciting light is by test substance electron excitation a to upper state, and upper state electronics transits to a lower state immediately, is simultaneously emitted by scattered photon.If the initial state of electronics is identical with the energy level of final states, according to preservation of energy, then scattered photon is equal with incident photon energy, this phenomenon is referred to as Rayleigh scattering；If electronics initial state is different from final states energy level, then scattered photon is different from incident photon energy, this phenomenon is referred to as Raman scattering.Raman spectrum is the vibration that a kind of vibrational spectra form, i.e. energy jump result from molecule.Because vibrating relevant to functional group, when transition energy depicts spectrogram as, i.e. can be used to identify molecule.
Existing Raman spectrum measurement system generally comprises LASER Light Source, detection probe, spectrogrph, wherein LASER Light Source is as the excitation source of Raman signal, exciting light is irradiated to sample surface after being detected the lens focus of probe, detection probe is to be filtered exciting light, focus on；Raman signal light being collected, filtered, is then communicated to spectrogrph, spectrogrph is used for dispersive Raman flashlight, Raman signal intensity at detection different wave length.
The defect of existing Raman spectrum measurement system is: exciting light be focus on after be irradiated to sample, it it is single-point Raman emission, the exciting light of the overwhelming majority is all fallen by sharp keen scattering, do not make full use of, exciting light is focused into and is a little irradiated to sample surfaces, produced Raman signal light radiates to surrounding centered by excitation light irradiation point, and the Raman light collection system popped one's head in is limited to NA and the operating distance restriction of its lens, the raman radiation signal in a least range angle can only be collected, therefore make this faintest Raman signal fainter, it is difficult to detect.Therefore, exciting light is shorter with the operating distance of sample, and output efficiency and the collection efficiency of Raman signal are the most relatively low, makes system detection sensitivity poor, it is difficult to detect humble concentration samples.
Summary of the invention
For defect present in above-mentioned prior art, technical problem to be solved in the utility model is to provide output efficiency and the collection efficiency height of a kind of Raman signal, thus system detection sensitivity is high, can be used for detecting the surface enhanced formula Raman test system of humble concentration samples.
In order to solve above-mentioned technical problem, a kind of surface enhanced formula Raman light spectrum testing system provided by the utility model, including grating spectrograph, LASER Light Source, detection probe, surface enhanced sampling module；
Described detection probe includes that raman excitation light optical fiber head, light source side collimating lens, short wave pass filter, narrow band pass filter, 45 degree of completely reflecting mirrors, 45 degree of dichroic filter, long wave pass filter, condenser lens, Ramans receive optical fiber head；
It is characterized in that: also include that surface enhanced sampling module, described surface enhanced sampling module include coupled lens, laser light incident optical fiber head, laser emitting optical fiber head, surface enhanced metal level；
This system has two light paths, and a light path therein is excitation light path, and another light path is detection light path；
The light channel structure of described excitation light path is: from LASER Light Source, first pass through raman excitation light optical fiber head, light source side collimating lens is entered through again from the diverging light plane of incidence of light source side collimating lens, the most successively through short wave pass filter, narrow band pass filter, 45 degree of completely reflecting mirrors, 45 degree of dichroic filter, coupled lens, laser light incident optical fiber head, laser emitting optical fiber heads, arrive surface enhanced metal level；
The light channel structure of described detection light path is: from surface enhanced metal level, receive optical fiber head through laser emitting optical fiber head, laser light incident optical fiber head, coupled lens, 45 degree of dichroic filter, long wave pass filter, condenser lens, Ramans successively, arrive grating spectrograph.
The surface enhanced formula Raman test system that this utility model provides, introduces surface enhanced effect, significantly improves output efficiency and the collection efficiency of Raman signal light, thus system detection sensitivity is high, can be used for detecting humble concentration samples.
Accompanying drawing explanation
Fig. 1 is the structural representation of the surface enhanced formula Raman test system of this utility model embodiment；
Fig. 2 is the structural representation of the detection probe in the surface enhanced formula Raman test system of this utility model embodiment.
Detailed description of the invention
Illustrate embodiment of the present utility model is described in further detail below in conjunction with accompanying drawing, but the present embodiment is not limited to this utility model, every employing analog structure of the present utility model and similar change thereof, all should list protection domain of the present utility model in.
As Figure 1-Figure 2, a kind of surface enhanced formula Raman test system that this utility model embodiment is provided, including grating spectrograph 1, LASER Light Source 4, detection probe 2；
Described detection probe 2 includes that raman excitation light optical fiber head 20, light source side collimating lens 21, short wave pass filter 22, narrow band pass filter 24,45 degree of dichroic filter 25 of 23,45 degree of completely reflecting mirrors, long wave pass filter 26, condenser lens 27, Raman receive optical fiber head 28；
It is characterized in that: also include that surface enhanced sampling module, described surface enhanced sampling module include coupled lens 30, laser light incident optical fiber head 31, laser emitting optical fiber head 32, surface enhanced metal level 34；
This system has two light paths, and a light path therein is excitation light path, and another light path is detection light path；
The light channel structure of described excitation light path is: from LASER Light Source 4s, first pass through raman excitation light optical fiber head 20, light source side collimating lens 21 is entered through again from the diverging light plane of incidence of light source side collimating lens 21, the most successively through short wave pass filter 22, narrow band pass filter 24,45 degree of dichroic filter 25 of 23,45 degree of completely reflecting mirrors, coupled lens 30, laser light incident optical fiber head 31, laser emitting optical fiber head 32, arrive surface enhanced metal level 34；
The light channel structure of described detection light path is: from surface enhanced metal level 34s, receive optical fiber head 28 through laser emitting optical fiber head 32, laser light incident optical fiber head 31,30,45 degree of dichroic filter 25 of coupled lens, long wave pass filter 26, condenser lens 27, Raman successively, arrive grating spectrograph 1.
In this utility model embodiment, described grating spectrograph 1, LASER Light Source 4 are prior art；Grating spectrograph is a kind of spectral analysis apparatus, according to wavelength, the Raman signal light inputted by optical fiber can be carried out intensity analysis, provide the spectral data of Raman signal light；LASER Light Source is a kind of narrow linewidth laser, it can launch the laser (such as the laser of 532nm and 785nm) of specific wavelength, this laser is popped one's head in detection by fiber-optic transfer as the exciting light of Raman signal, in detection probe after filtering, focus on coupled lens, then in fiber-optic transfer to the testing sample drop 33 between laser emitting optical fiber head 32 and surface enhanced metal level 34 after reflection.
In this utility model embodiment, described short wave pass filter 22 is for absorbing the useless long wavelength components veiling glare of lasing light emitter, to reduce the interference of wave detection signal long to system；Described narrow band pass filter 23 can purify the laser output of excitation source further, filters the limit mould of exciting light；Described 45 degree of completely reflecting mirrors 24 can reflect 45 degree of incident raman excitation lights, makes the laser through narrow band pass filter 23 transfer 90 degree, incides 45 degree of dichroic filter 25；Described 45 degree of dichroic filter 25 can reflect the raman excitation light that turnover 45 degree is incident, allows 45 degree of incident Raman signal light to pass through simultaneously；Described long wave pass filter 26 can effectively filter out the exciting light of remnants, makes exciting light will not affect the detector response to Raman signal light；Described condenser lens 27 can will be focused by the Raman signal light of long wave pass filter 26, is coupled into Raman and receives optical fiber head 28；Described coupled lens 30, for the exciting light of detection probe outgoing is coupled into laser light incident optical fiber head 31, can also will be collimated by the Raman signal light of laser light incident optical fiber head 31 outgoing simultaneously；Described laser light incident optical fiber head 31 and laser emitting optical fiber head 32 are optical fiber contact pins structure, and end face optical polish, laser emitting optical fiber head 32 can adsorb sample drop 33 to be measured, sample drop 33 has certain focussing force to the exciting light from laser emitting optical fiber head 32 outgoing, can focus on the Raman signal excited again simultaneously and be coupled into laser emitting optical fiber head 32；Described surface enhanced metal level 34 is to have the gold plate of certain roughness, silvering, copper coating or metal needle, and it can be obviously enhanced the output capacity of Raman signal light, generally can improve more than 3 magnitudes.
The operation principle of this utility model embodiment is as follows:
LASER Light Source 4 launch laser through fiber-optic transfer to raman excitation light optical fiber head 20, light source side collimating lens 21 is entered through again from the diverging light plane of incidence of light source side collimating lens 21, after being collimated by light source side collimating lens 21, initially pass through short wave pass filter 22 the most successively and filter long wave veiling glare, limit mould is filtered again through narrow band pass filter 23, again after 45 degree of completely reflecting mirror 24 reflections, light path is transferred 90 degree, incide 45 degree of dichroic filter 25, after being totally reflected by 45 degree of dichroic filter 25, incide coupled lens 30, it is coupled into laser light incident optical fiber head 31 again by coupled lens 30, after fiber-optic transfer, from laser emitting optical fiber head 32 outgoing, incide on testing sample drop 33, under the potentiation of surface enhanced metal level 34, produce the Raman light signal strengthened；
The Raman signal light strengthened is coupled into laser emitting optical fiber head 32 after sample drop 33 focusing collector, laser light incident optical fiber head 31 outgoing is passed through again after fiber-optic transfer, again after coupled lens 30 couples, first filtered part exciting light residual by 45 degree of dichroic filter 25 successively, the exciting light residual being mingled with in flashlight is further filtered out again through long wave pass filter 26, line focus lens 27 are coupled into Raman and receive optical fiber head 28 again, enter grating spectrograph 1 through fiber-optic transfer, obtain raman spectral signal spectrogram.
Claims (1)
1. a surface enhanced raman spectroscopy test system, including grating spectrograph, LASER Light Source, detection probe；
Described detection probe includes that raman excitation light optical fiber head, light source side collimating lens, short wave pass filter, narrow band pass filter, 45 degree of completely reflecting mirrors, 45 degree of dichroic filter, long wave pass filter, condenser lens, Ramans receive optical fiber head；
It is characterized in that: also include that surface enhanced sampling module, described surface enhanced sampling module include coupled lens, laser light incident optical fiber head, laser emitting optical fiber head, surface enhanced metal level；
This system has two light paths, and a light path therein is excitation light path, and another light path is detection light path；
The light channel structure of described excitation light path is: from LASER Light Source, first pass through raman excitation light optical fiber head, light source side collimating lens is entered through again from the diverging light plane of incidence of light source side collimating lens, the most successively through short wave pass filter, narrow band pass filter, 45 degree of completely reflecting mirrors, 45 degree of dichroic filter, coupled lens, laser light incident optical fiber head, laser emitting optical fiber heads, arrive surface enhanced metal level；
The light channel structure of described detection light path is: from surface enhanced metal level, receive optical fiber head through laser emitting optical fiber head, laser light incident optical fiber head, coupled lens, 45 degree of dichroic filter, long wave pass filter, condenser lens, Ramans successively, arrive grating spectrograph.
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| CN201620230706.1U CN205449805U (en) | 2016-03-24 | 2016-03-24 | Surface reinforcing raman spectroscopy test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105651759A (en) * | 2016-03-24 | 2016-06-08 | 上海如海光电科技有限公司 | Surface-enhanced type Raman spectrum testing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105651759A (en) * | 2016-03-24 | 2016-06-08 | 上海如海光电科技有限公司 | Surface-enhanced type Raman spectrum testing system |
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