CN204374087U - A kind of Raman spectrum test macro based on liquid core waveguide - Google Patents
A kind of Raman spectrum test macro based on liquid core waveguide Download PDFInfo
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- CN204374087U CN204374087U CN201520063766.4U CN201520063766U CN204374087U CN 204374087 U CN204374087 U CN 204374087U CN 201520063766 U CN201520063766 U CN 201520063766U CN 204374087 U CN204374087 U CN 204374087U
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Abstract
Based on a Raman spectrum test macro for liquid core waveguide, relate to technical field of spectral detection, what solve is the technical matters improving detection sensitivity.This system comprises grating spectrograph, LASER Light Source, light transmitting-receiving probe, liquid core waveguide sample cell; Described light transmitting-receiving probe comprises raman excitation light optical fiber head, light source side collimation lens, the first condenser lens, the second condenser lens, narrow band pass filter, the first long pass filter, the second long pass filter, the 3rd long pass filter, completely reflecting mirror, Raman reception optical fiber head; Described liquid core waveguide sample cell comprises closed chamber, and is built in the liquid core waveguide pipe in closed chamber, closed chamber has a detection window just right with one end mouth of pipe of liquid core waveguide pipe.The system that the utility model provides, can be used for detecting humble concentration samples.
Description
Technical field
The utility model relates to spectrum detection technique, particularly relates to a kind of technology of the Raman spectrum test macro based on liquid core waveguide.
Background technology
Incident photon excites electronic to the virtual stake (virtual state) of a high energy, and electronics immediately de excitation is dealt into a low-energy state, sends scattered photon.If the initial state of electronics is identical with the energy level of final states, so scattered photon is equal with incident photon energy, is called Rayleigh scattering; And electronics initial state is different from final states energy level, so scattered photon and incident photon energy different, be called Raman scattering.When final states energy level is higher than initial level, it is Stokes Raman scattering; When final states energy level is lower than initial level, it is anti Stokes scattering.The volume efficiency of Stokes and anti Stokes scattering depends on the molecular amounts being in ground state or excited vibrational state, and available Bolzmann equation calculates.Electronics is within the scope of typical temperature, and most probable is in its minimum energy state, and thus stokes scattering is more common than anti Stokes scattering, and Raman spectrometer generally only measures Stokes Raman scattering.Raman spectrum is a kind of vibrational spectra form, and namely energy jump results from the vibration of molecule.Because vibrate relevant to functional group (functional group), when transition energy depicts spectrogram as, can be used to identify molecule.
Existing Raman spectrum measurement system generally comprises LASER Light Source, light transmitting-receiving probe, spectrometer, LASER Light Source is wherein as the excitation source of Raman signal, sample surface is irradiated to by after the lens focus of light transmitting-receiving probe, light transmitting-receiving probe carries out filtering, focusing to exciting light, and Raman signal light is collected, filtering, then be transferred to spectrometer, spectrometer is used for dispersive Raman flashlight, the Raman signal intensity at detection different wave length place.
In existing Raman spectrum measurement system, exciting light is irradiated to sample after focusing on, 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, and exciting light is focused into and is a little irradiated to sample surfaces, the Raman signal light produced centered by exciting light point of irradiation to surrounding radiation, and the Raman light collection system of probe is limited to NA and the operating distance restriction of its lens, the raman radiation signal in a very little scope angle can only be collected, therefore make this just fainter Raman signal fainter, be difficult to detection, therefore, the operating distance of exciting light and sample is shorter, and the output efficiency of Raman signal and collection efficiency are all lower, makes systems axiol-ogy sensitivity poor, is difficult to detect humble concentration samples.
Summary of the invention
For the defect existed in above-mentioned prior art, technical problem to be solved in the utility model be to provide a kind of output efficiency of Raman signal and collection efficiency high, thus systems axiol-ogy is highly sensitive, can be used for the Raman spectrum test macro based on liquid core waveguide detecting humble concentration samples.
In order to solve the problems of the technologies described above, a kind of Raman spectrum test macro based on liquid core waveguide provided by the utility model, comprises grating spectrograph, LASER Light Source, light transmitting-receiving probe;
Described light transmitting-receiving probe comprises raman excitation light optical fiber head, light source side collimation lens, the first condenser lens, the second condenser lens, narrow band pass filter, the first long pass filter, the second long pass filter, the 3rd long pass filter, completely reflecting mirror, Raman reception optical fiber head;
It is characterized in that: also comprise liquid core waveguide sample cell;
Described liquid core waveguide sample cell comprises closed chamber, and is built in the liquid core waveguide pipe in closed chamber, closed chamber has a detection window just right with one end mouth of pipe of liquid core waveguide pipe, and liquid core waveguide pipe is being just the test side of liquid core waveguide pipe to one end of detection window;
This system has two light paths, and a light path is wherein excitation light path, and another light path is for detecting light path;
The light channel structure of excitation light path is wherein: from LASER Light Source, successively through the detection window of raman excitation light optical fiber head, light source side collimation lens, narrow band pass filter, the first long pass filter, the first condenser lens, closed chamber, arrive the test side of liquid core waveguide pipe;
The light channel structure of detection light path is wherein: from the test side of liquid core waveguide pipe, successively through detection window, the first condenser lens, the first long pass filter, the second long pass filter, completely reflecting mirror, the 3rd long pass filter, the second condenser lens, the Raman reception optical fiber head of closed chamber, arrive grating spectrograph.
Further, described closed chamber offers the liquid injection port, liquid outlet, the bleeding point that are communicated with liquid core waveguide pipe tube chamber.
Further, described light transmitting-receiving probe is built with the exciting light absorbing sheet of raman excitation light more than absorption of residual.
The Raman spectrum test macro based on liquid core waveguide that the utility model provides, liquid core waveguide pipe is utilized to improve the operating distance of exciting light and sample, exciting light is continued and sample effect in optical waveguide, improve the utilization ratio of exciting light, effectively improve the output efficiency of Raman signal, the Raman signal excited superposes enhancing in liquid core waveguide pipe, and exported by liquid core waveguide pipe, significantly improve the collection efficiency of Raman emission, effectively improve the sensitivity of systems axiol-ogy, the Raman signal of more difficult detection is in the past made to be easy to detect, can be used for detecting humble concentration samples.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Raman spectrum test macro based on liquid core waveguide of the utility model embodiment;
Fig. 2 is the structural representation based on the light transmitting-receiving probe in the Raman spectrum test macro of liquid core waveguide of the utility model embodiment;
Fig. 3 is the structural representation based on the liquid core waveguide sample cell in the Raman spectrum test macro of liquid core waveguide of the utility model embodiment.
Embodiment
Illustrate below in conjunction with accompanying drawing and be described in further detail embodiment of the present utility model, but the present embodiment is not limited to the 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 shown in Figure 1-Figure 3, a kind of Raman spectrum test macro based on liquid core waveguide that the utility model embodiment provides, comprises grating spectrograph 1, LASER Light Source 4, light transmitting-receiving probe 2;
Described light transmitting-receiving probe 2 comprises raman excitation light optical fiber head 221, light source side collimation lens 210, first condenser lens 211, second condenser lens 212, the long pass filter 232 of narrow band pass filter the 240, first long pass filter 231, second, the 3rd long pass filter 233, completely reflecting mirror 250, Raman reception optical fiber head 222;
It is characterized in that: also comprise liquid core waveguide sample cell 3;
Described liquid core waveguide sample cell comprises closed chamber 36, and the liquid core waveguide pipe 33 be built in closed chamber, closed chamber 36 has a detection window 31 just right with one end mouth of pipe of liquid core waveguide pipe 33, and on closed chamber, offering the liquid injection port 32, liquid outlet 34, the bleeding point 35 that are communicated with liquid core waveguide pipe tube chamber, liquid core waveguide pipe 33 is being just the test side of liquid core waveguide pipe 33 to one end of detection window 31;
This system has two light paths, and a light path is wherein excitation light path, and another light path is for detecting light path;
The light channel structure of excitation light path is wherein: from LASER Light Source 4s, successively through the detection window 31 of raman excitation light optical fiber head 221, light source side collimation lens 210, long pass filter 231, first condenser lens 211 of narrow band pass filter 240, first, closed chamber, arrive the test side of liquid core waveguide pipe 33;
The light channel structure of detection light path is wherein: from the test side of liquid core waveguide pipe 33, successively through the long pass filter 232 of detection window 31, first condenser lens the 211, first long pass filter 231, second, completely reflecting mirror 250, the 3rd long pass filter 233, second condenser lens 212, the Raman reception optical fiber head 222 of closed chamber, arrive grating spectrograph 1.
In the utility model embodiment, described light receives and dispatches the exciting light absorbing sheet 260 of probe 2 built with raman excitation light more than absorption of residual, to reduce the parasitic light of system.
In the utility model embodiment, described detection window 31 is the sapphire eyeglasses that can pass for exciting light and Raman signal light.
In the utility model embodiment, described grating spectrograph 1, LASER Light Source 4, liquid core waveguide pipe 33 are prior art; Grating spectrograph is a kind of spectral analysis apparatus, the Raman signal light inputted can be carried out intensive analysis according to wavelength, provide the spectral data of Raman signal light by optical fiber; Liquid core waveguide pipe is made up of Teflon material, its refractive index is extremely low, only have 1.29, when liquid (such as water, refractive index is 1.33) when being full of liquid core waveguide pipe, refractive index due to liquid is greater than the refractive index of liquid core waveguide pipe, can be totally reflected after light enters liquid core waveguide pipe, liquid core waveguide pipe forms optical waveguide, make light can in liquid core waveguide pipe onwards transmission, liquid core waveguide pipe also has a large characteristic simultaneously, and it can make nitrogen, oxygen, carbon dioxide, hydrogen etc. through tube wall, and can not through liquid; LASER Light Source is a kind of narrow linewidth laser, it can launch the laser (laser as 532nm and 785nm) of specific wavelength, this laser as Raman signal exciting light by Optical Fiber Transmission to light transmitting-receiving probe, light transmitting-receiving probe in after filtering, reflection, focus on liquid core waveguide pipe.
The principle of work of the utility model embodiment is as follows:
Aspiration pump is connected at the bleeding point 35 of closed chamber, sample is sent into the liquid injection port 32 of closed chamber, and utilize aspiration pump to take air in liquid core waveguide 33 away, make sample enter liquid core waveguide pipe via liquid injection port 32, be full of liquid core waveguide pipe and and detection window 31 between space;
The laser that LASER Light Source is launched enters light transmitting-receiving probe by optical fiber, after laser enters light transmitting-receiving probe, the parallel beam of collimation is first calibrated to by light source side collimation lens 210, again by narrow band pass filter 240 filtering limit mould and the parasitic light after fibre-optical dispersion, after being reflected by the first long pass filter 231 again, light path turnover 90 degree is along the direction being parallel to the first condenser lens 211 optical axis, successively through the first condenser lens 211, after the detection window 31 of closed chamber, exciting light focuses on the test side of liquid core waveguide pipe 33, be incorporated to and inject liquid core waveguide pipe 33, transmit along liquid core waveguide pipe 33 towards the other end of liquid core waveguide pipe 33 again, constantly Raman signal light is produced in the process that exciting light transmits in liquid core waveguide pipe 33, Raman signal light also transmits towards the two ends of liquid core waveguide pipe 33 simultaneously, with the reverse Raman signal light of exciting light successively through the detection window 31 of closed chamber, after first condenser lens 211, the parallel beam of collimation is calibrated to by the first condenser lens 211, then successively through the first long pass filter 231, second long pass filter 232, remaining exciting light is by the first long pass filter 231, absorbed by exciting light absorbing sheet 260 after second long pass filter 232 reflects turnover 90 degree, and Raman signal light can cut across the first long pass filter 231, second long pass filter 232 arrives completely reflecting mirror 250, transferred after 90 degree successively first through the 3rd long pass filter 233 by completely reflecting mirror 250 again, enter to inject Raman after being focused on by the second condenser lens 212 again and receive optical fiber head 222, then grating spectrograph 1 is entered through Optical Fiber Transmission, obtain raman spectral signal spectrogram.
Claims (3)
1., based on a Raman spectrum test macro for liquid core waveguide, comprise grating spectrograph, LASER Light Source, light transmitting-receiving probe;
Described light transmitting-receiving probe comprises raman excitation light optical fiber head, light source side collimation lens, the first condenser lens, the second condenser lens, narrow band pass filter, the first long pass filter, the second long pass filter, the 3rd long pass filter, completely reflecting mirror, Raman reception optical fiber head;
It is characterized in that: also comprise liquid core waveguide sample cell;
Described liquid core waveguide sample cell comprises closed chamber, and is built in the liquid core waveguide pipe in closed chamber, closed chamber has a detection window just right with one end mouth of pipe of liquid core waveguide pipe, and liquid core waveguide pipe is being just the test side of liquid core waveguide pipe to one end of detection window;
This system has two light paths, and a light path is wherein excitation light path, and another light path is for detecting light path;
The light channel structure of excitation light path is wherein: from LASER Light Source, successively through the detection window of raman excitation light optical fiber head, light source side collimation lens, narrow band pass filter, the first long pass filter, the first condenser lens, closed chamber, arrive the test side of liquid core waveguide pipe;
The light channel structure of detection light path is wherein: from the test side of liquid core waveguide pipe, successively through detection window, the first condenser lens, the first long pass filter, the second long pass filter, completely reflecting mirror, the 3rd long pass filter, the second condenser lens, the Raman reception optical fiber head of closed chamber, arrive grating spectrograph.
2. the Raman spectrum test macro based on liquid core waveguide according to claim 1, is characterized in that: described closed chamber offers the liquid injection port, liquid outlet, the bleeding point that are communicated with liquid core waveguide pipe tube chamber.
3. the Raman spectrum test macro based on liquid core waveguide according to claim 1, is characterized in that: described light transmitting-receiving probe is built with the exciting light absorbing sheet of raman excitation light more than absorption of residual.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614363A (en) * | 2015-01-29 | 2015-05-13 | 上海如海光电科技有限公司 | Raman spectrum testing system based on liquid core waveguide |
| CN109358034A (en) * | 2018-10-29 | 2019-02-19 | 中国科学院上海技术物理研究所 | Spacefarer's urine detection method based on liquid core waveguide combined spectral |
| CN113418609A (en) * | 2021-07-15 | 2021-09-21 | 中国科学院半导体研究所 | Raman spectrum testing system |
-
2015
- 2015-01-29 CN CN201520063766.4U patent/CN204374087U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614363A (en) * | 2015-01-29 | 2015-05-13 | 上海如海光电科技有限公司 | Raman spectrum testing system based on liquid core waveguide |
| CN109358034A (en) * | 2018-10-29 | 2019-02-19 | 中国科学院上海技术物理研究所 | Spacefarer's urine detection method based on liquid core waveguide combined spectral |
| CN113418609A (en) * | 2021-07-15 | 2021-09-21 | 中国科学院半导体研究所 | Raman spectrum testing system |
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