CN214408698U - Raman spectrum and ion mobility spectrum combined detection device - Google Patents
Raman spectrum and ion mobility spectrum combined detection device Download PDFInfo
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- CN214408698U CN214408698U CN202120232185.4U CN202120232185U CN214408698U CN 214408698 U CN214408698 U CN 214408698U CN 202120232185 U CN202120232185 U CN 202120232185U CN 214408698 U CN214408698 U CN 214408698U
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Abstract
The utility model provides a Raman spectrum and ion mobility spectrum combined detection device, a sampler is used for collecting gas volatilized by a sample to be detected, and an ionization area is used for migrating ion clusters to an ion collector; the ion collector is used for collecting ion charges of the ion clusters and generating ion migration data; the laser collimation and focusing device is used for carrying out laser irradiation on a sample to be detected to obtain Raman scattering light; the spectrometer is used for generating spectral data; the support circuit is used for obtaining the name of the sample to be detected. The device is small and portable, has high detection speed, does not need sample pretreatment, has high sensitivity of signals, does not have consumables or consumables with long service life, improves the detection efficiency and accuracy, has great application potential in the application of detecting liquid and solid volatile toxic and harmful substances, and has the specific application fields of reconnaissance detection and treatment for chemical weapons, reconnaissance and treatment of emergency incident sites, environmental protection inspection and the like.
Description
Technical Field
The utility model belongs to the detection area especially relates to a detection device is united with ion mobility spectrometry to raman spectroscopy.
Background
The ion mobility spectrometry adopts radioactive substance rays (alpha or beta rays) or a passive ionization method (ultraviolet ionization, high-voltage discharge ionization and the like) to ionize under the action of water molecules and oxygen and form ion clusters with gaseous detected molecules. Under the action of the electric field, these product ions enter the migration zone through the periodically opened ion gates. In the migration region, ions obtain energy from an electric field for directional drift, and on the other hand, the ions continuously collide with neutral migration gas molecules flowing reversely to lose energy. The composition of the object to be detected can be qualitatively and semi-quantitatively determined based on the difference in specific mobility of the specific substance.
On the other hand, raman spectroscopy, raman of indian physicist found in 1928, a sample can generate a scattering spectrum with a frequency different from that of incident light, the raman scattering spectrum is independent of incident light wavelength, the spectrum is generated by vibration, rotation and the like of chemical bonds of substances, has very strong correlation with chemical composition structures of measured substances and can reflect the characteristics of molecular structures, and therefore the raman spectrum is a molecular vibration spectrum. The equipment based on Raman spectrum detection is convenient to miniaturize, can detect a large number of substances, can detect tens of thousands of substances under the condition of existence of standard substance spectrums, and is particularly suitable for rapid screening detection. Through the analysis to Raman spectrum and the analysis of ion mobility spectrometry, can detect easily volatile substance and the difficult volatile substance in the sample, the aassessment is detected the mixture composition of material, realizes the accurate detection to the material tested, improves the accuracy of matching.
The existing gas chromatography-mass spectrometry combined equipment adopts a collection mode that liquid and solid volatile toxic and harmful substances are adsorbed and enriched in a gas form, all the substances enter a chromatographic column through instantaneous heating desorption, each component is separated and purified through the programmed temperature rise process of the chromatographic column, and each component independently enters mass spectrometry equipment to generate sample fragments, and the sample fragments are compared through an existing substance library to obtain the name of each substance. The device has larger volume, the weight is generally close to or more than 20kg, the length and the width are both more than 40 cm, each detection time is about 3-5 minutes, a large amount of high-purity helium consumables are consumed, the energy consumption is larger due to the need of heating the chromatographic column, and the heating speed and the target temperature need to be adjusted according to different measured substances.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a detection device is united with ion mobility spectrometry to prior art's defect and not enough to raman spectroscopy.
The utility model provides a pair of detection device is united with ion mobility spectrometry to raman spectroscopy, include: sampler, ionization region, ion collector, laser collimation and focuser, spectrometer and support circuit, wherein:
the sampler is used for collecting gas volatilized by a sample to be detected and diluting the gas according to a preset proportion to obtain second gas;
the ionization region is connected with the sampler and is used for ionizing the second gas to obtain ion clusters and transferring the ion clusters to an ion collector through an ion gate under the action of an electric field and a transfer gas flow;
the ion collector is connected with the ionization region and used for collecting the ion charges of the ion clusters, generating ion migration data according to the ion charges and outputting the ion migration data to a support circuit;
the laser collimation and focusing device is connected with the sampler and is used for carrying out laser irradiation on the sample to be detected to obtain Raman scattering light;
the spectrometer is connected with the laser collimation and focalizer and used for acting on the Raman scattering light to generate spectral data and outputting the spectral data to the supporting circuit;
the support circuit is connected with the ion collector and the spectrometer and is used for obtaining the name of the sample to be detected. According to the technical scheme, the utility model has the advantages of it is following: the utility model provides a detection device is united with ion mobility spectrometry to raman spectrum, treats simultaneously through the structure of integration and detects the sample and carry out raman detection and ion mobility spectrometry and detect, detects and need not use the consumptive material, need not send out miscellaneous preliminary treatment step, can detect the measured object of multiple physical state, does not need the program control temperature, and energy consumption is low, has improved detection speed, does not have the parameter of predetermineeing, easy operation, and small, portable.
Drawings
Fig. 1 is a schematic structural framework diagram of a raman spectroscopy and ion mobility spectroscopy combined detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another raman spectrum and ion mobility spectrum combined detection apparatus according to an embodiment of the present invention.
Detailed Description
The embodiment of the utility model provides a detection device is united with ion mobility spectrometry to raman spectrum, has solved current gas chromatography mass spectrum combination equipment and need consume a large amount of high-purity helium consumptive materials, owing to need heat the chromatographic column, energy consumption is also great to need adjust the speed of intensification and the problem of target temperature according to the difference of measured object matter.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Please refer to fig. 1, which is a schematic structural diagram of a raman spectroscopy and ion mobility spectroscopy combined detection apparatus provided by the present invention.
As shown in fig. 1, there is provided a schematic structural framework diagram of a combined raman spectroscopy and ion mobility spectroscopy detection apparatus, including: sampler 100, ionization region 200, ion collector 300, laser collimation and focuser 400, spectrometer 500 and support circuitry 600, wherein:
the sampler 100 is used for collecting gas volatilized by a sample to be detected and diluting the gas according to a preset proportion to obtain a second gas;
the ionization region 200 is connected to the sampler 100, and is configured to ionize the second gas to obtain ion clusters, and to migrate the ion clusters to the ion collector 300 through the ion gate under the action of the electric field and the migration gas flow;
the ion collector 300 is connected to the ionization region 200, and is configured to collect ion charges of the ion clusters, generate ion migration data according to the ion charges, and output the ion migration data to the support circuit 600;
the laser collimation and focalizer 400 is connected with the sampler 100 and is used for carrying out laser irradiation on a sample to be detected to obtain Raman scattering light;
the spectrometer 500 is connected to the laser collimating and focusing device 400, and is configured to act on the raman scattered light, generate spectral data, and output the spectral data to the support circuit 600;
the support circuit 600 connects the ion accumulator 300 and the spectrometer 500 for obtaining the name of the sample to be tested.
The function of the support circuit 600 may be implemented by an existing structure, for example, a chip of model STM32F405 may implement obtaining the composition of a substance according to ion mobility data and spectral data.
The detection device is united with ion mobility spectrometry to raman spectrum that this embodiment provided treats simultaneously through the structure of integration and detects the sample and carry out raman detection and ion mobility spectrometry, detects and need not use the consumptive material, need not send out miscellaneous preliminary treatment step, can detect the measured object of multiple physical state, does not need program temperature control, and energy consumption is low, has improved detection speed, does not have the preset parameter, easy operation, and small, portable.
As shown in fig. 2, a more specific structural schematic diagram of the raman spectrum and ion mobility spectrum combined detection apparatus is provided, in which a dotted line is an air path, a dotted line is an optical path, and a direction pointed by an arrow is a direction in which the air path flows, which is further described below with reference to fig. 2.
Optionally, in some possible embodiments, the sampler comprises an air inlet 1, a volatile substance sampler 2, a volatile substance and air mixer 3 and a sample loader 12 to be tested;
the air inlet 1 and the volatile substance sampler 2 are respectively communicated with a volatile substance and air mixer 3, the volatile substance and air mixer 3 is communicated with an ionization region, the volatile substance sampler 2 is also communicated with a tested sample loader 12, and the tested sample loader 12 is also communicated with a laser collimation and focusing device 13.
Optionally, in some possible embodiments, a filter is also provided in the air intake 1.
Optionally, in some possible embodiments, the ionization region comprises: an ionization source 4, an ionization chamber 5, an ion gate 6, and an ion transfer chamber 7, wherein:
the ionization source 4 is arranged inside the ionization chamber 5 and is used for ionizing the second gas to obtain an ion cluster;
the ionization chamber 5 is respectively communicated with the volatile substance and air mixer 3 and the ion migration chamber 7 and is used for isolating external gas and environment and providing an electric field effect to separate ion clusters with different electric properties;
an ion gate 6 is arranged between the ionization chamber 5 and the ion migration chamber 7, and by periodically switching the direction of a gate electric field, the collected ion clusters enter the ion migration chamber 7 at the same time, and neutral molecules and migration gas are discharged from the ionization chamber 5;
the ion migration chamber 7 is disposed at the rear side of the ion gate 6, and is configured to accelerate ion clusters to the ion collector by using a constant electric field and provide a gas flow channel for migration gas flow, and to introduce the migration gas so that neutral molecules are discharged from the ion gate 6.
Optionally, in some possible embodiments, the ion collector comprises: faraday disk 8, faraday disk connector 9 and current amplification circuit 10, wherein:
the Faraday disk 8 is arranged at the rear part of the ion migration chamber 7 and is used for collecting ion charges of ion clusters to obtain an electric signal;
the Faraday disc connector 9 is connected with the Faraday disc 8 and used for outputting the electric signal to the current amplifying circuit 10;
the current amplification circuit 10 is connected to the faraday disk connector 9, and amplifies the electrical signal to obtain ion mobility data, and outputs the ion mobility data to the support circuit 27.
Optionally, in some possible embodiments, the laser collimating and focusing device 13 comprises: a laser light source 17, a reflecting mirror 18, a dichroic mirror 15, a first lens 14, a second lens 16, and an aperture 19;
the laser light source 17 is used for generating laser light;
the reflecting mirror 18 is arranged on the light path of the laser light source 17 and used for reflecting the laser light to reflect the laser light to the dichroic mirror;
the dichromatic mirror 15 is arranged on a light path of the laser light source 17 and is used for reflecting laser so that the laser is emitted into the tested sample loader 12 through the first lens 14 and a Raman signal generated after the laser irradiates a sample to be tested is transmitted and passed;
the first lens 14 is arranged between the dichromatic mirror 15 and the to-be-detected sample loader 12, and is used for focusing laser to irradiate a to-be-detected sample to generate Raman scattering light and acting the Raman scattering light to form parallel light;
the second lens 16 is disposed between the dichroic mirror 15 and the pinhole 19, and focuses the parallel light;
an aperture 19 is disposed between the second lens 16 and the spectrometer 20 for transmitting the focused parallel light to the spectrometer 20.
Optionally, in some possible embodiments, the spectrometer 20 comprises: a first spherical mirror 23, a grating 22, a second spherical mirror 21, a charge coupler 24, a signal line 25, and a spectral signal processor 26;
the first spherical mirror 23 is arranged between the small hole 19 and the grating 22 and used for reflecting the focused parallel light and leading the parallel light to be emitted to the grating 22;
the grating 22 is arranged between the first spherical mirror 23 and the second spherical mirror 21, and is used for spatially resolving the wavelength of the parallel light reflected by the first spherical mirror 23, so that the parallel light after the wavelength resolution is emitted to the second spherical mirror 21;
the second spherical mirror 21 is disposed between the grating 22 and the charge coupler 24, and is used for reflecting the light refracted by the grating 22 to the charge coupler 24;
the charge coupler 24 is used for generating a charge coupled signal according to the received emitted light;
the signal line 25 connects the charge-coupled device 24 and the spectral signal processor 26 for converting the charge-coupled signal into spectral data and transmitting the spectral data to the support circuit 27.
Optionally, in some possible embodiments, molecular sieves 11;
the molecular sieve 11 is arranged outside the ionization region, and is used for purifying the migration gas flow in the ionization region and forming a closed-cycle gas path with the ionization region.
It is to be understood that some or all of the various embodiments described above may be included in some embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. A Raman spectrum and ion mobility spectrum combined detection device is characterized by comprising: sampler, ionization region, ion collector, laser collimation and focuser, spectrometer and support circuit, wherein:
the sampler is used for collecting gas volatilized by a sample to be detected and diluting the gas according to a preset proportion to obtain second gas;
the ionization region is connected with the sampler and is used for ionizing the second gas to obtain ion clusters and transferring the ion clusters to an ion collector through an ion gate under the action of an electric field and a transfer gas flow;
the ion collector is connected with the ionization region and used for collecting the ion charges of the ion clusters, generating ion migration data according to the ion charges and outputting the ion migration data to a support circuit;
the laser collimation and focusing device is connected with the sampler and is used for carrying out laser irradiation on the sample to be detected to obtain Raman scattering light;
the spectrometer is connected with the laser collimation and focalizer and used for acting on the Raman scattering light to generate spectral data and outputting the spectral data to the supporting circuit;
the support circuit is connected with the ion collector and the spectrometer and is used for obtaining the name of the sample to be detected.
2. The apparatus of claim 1, wherein the sampler comprises an air inlet, a volatile substance sampler, a volatile substance and air mixer, and a sample loader to be tested;
the air inlet and the volatile substance sampler are respectively communicated with the volatile substance and air mixer, the volatile substance and air mixer is communicated with the ionization region, the volatile substance sampler is also communicated with the tested sample loader, and the tested sample loader is also communicated with the laser collimation and focusing device.
3. The device for detecting Raman spectrum and ion mobility spectrum according to claim 2,
a filter is also arranged in the air inlet.
4. The raman spectroscopy and ion mobility spectroscopy combined detection device of claim 2, wherein the ionization region comprises: an ionization source, an ionization chamber, an ion gate, and an ion transfer chamber, wherein:
the ionization source is arranged in the ionization chamber and is used for ionizing the second gas to obtain an ion cluster;
the ionization chamber is respectively communicated with the volatile substance and air mixer and the ion migration chamber and is used for isolating external gas and environment and providing an electric field effect to separate ion clusters with different electric properties;
the ion gate is arranged between the ionization chamber and the ion migration chamber, and enables the collected ion clusters to enter the ion migration chamber at the same time by periodically switching the direction of the gate electric field, and neutral molecules and migration gas are discharged from the ionization chamber;
the ion migration chamber is arranged at the rear side of the ion gate and used for accelerating the ion clusters to the ion collector by using a constant electric field, providing an air flow channel for migration air flow and introducing the migration air to enable neutral molecules to be discharged from the ion gate.
5. The apparatus of claim 4, wherein the ion accumulator comprises: faraday, faraday connector and current amplification circuit, wherein:
the Faraday disc is arranged at the rear part of the ion migration chamber and is used for collecting the ion charges of the ion clusters to obtain an electric signal;
the Faraday disc connector is connected with the Faraday disc and used for outputting the electric signal to the current amplification circuit;
the current amplification circuit is connected with the Faraday disc connector and used for amplifying the electric signal to obtain ion migration data and outputting the ion migration data to the supporting circuit.
6. The apparatus of claim 2, wherein the laser alignment and focusing device comprises: the device comprises a laser light source, a reflector, a dichromatic mirror, a first lens, a second lens and a small hole;
the laser light source is used for generating laser;
the reflecting mirror is arranged on a light path of the laser light source and used for reflecting the laser light so that the laser light is reflected to the dichroic mirror;
the dichroscope is arranged on a light path of the laser light source and is used for reflecting the laser to enable the laser to enter the tested sample loader through the first lens and enable a Raman signal generated after the laser irradiates the sample to be tested to be transmitted;
the first lens is arranged between the dichroscope and the to-be-detected sample loader and is used for enabling the laser to be focused and irradiate the to-be-detected sample to generate Raman scattering light and acting the Raman scattering light to form parallel light;
the second lens is arranged between the dichroscope and the small hole and is used for focusing the parallel light;
the small hole is arranged between the second lens and the spectrometer and used for transmitting the focused parallel light to the spectrometer.
7. The apparatus of claim 6, wherein the spectrometer comprises: the system comprises a first spherical mirror, a grating, a second spherical mirror, a charge coupler, a signal line and a spectrum signal processor;
the first spherical mirror is arranged between the small hole and the grating and used for reflecting the focused parallel light so that the parallel light is emitted to the grating;
the grating is arranged between the first spherical mirror and the second spherical mirror and is used for spatially resolving the wavelength of the parallel light reflected by the first spherical mirror and enabling the parallel light after the wavelength resolution to be emitted to the second spherical mirror;
the second spherical mirror is arranged between the grating and the charge coupler and used for reflecting the light refracted by the grating to the charge coupler;
the charge coupler is used for generating a charge coupling signal according to the received emitted light;
the signal line is connected with the charge coupler and the spectrum signal processor and used for converting the charge coupled signal into spectrum data and transmitting the spectrum data to the supporting circuit.
8. The apparatus for combined Raman spectroscopy and ion mobility spectroscopy of any one of claims 1-7, further comprising a molecular sieve;
the molecular sieve is arranged outside the ionization region, is used for purifying the migration gas flow in the ionization region and forms a closed-cycle gas path with the ionization region.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116577317A (en) * | 2023-06-09 | 2023-08-11 | 上海凯来仪器有限公司 | Combined detection device and combined detection method for Raman-laser ablation-mass spectrum |
| GB2622190A (en) * | 2022-08-19 | 2024-03-13 | Smiths Detection Watford Ltd | Sampling system, detection apparatus, and methods of use thereof |
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2021
- 2021-01-27 CN CN202120232185.4U patent/CN214408698U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2622190A (en) * | 2022-08-19 | 2024-03-13 | Smiths Detection Watford Ltd | Sampling system, detection apparatus, and methods of use thereof |
| CN116577317A (en) * | 2023-06-09 | 2023-08-11 | 上海凯来仪器有限公司 | Combined detection device and combined detection method for Raman-laser ablation-mass spectrum |
| CN116577317B (en) * | 2023-06-09 | 2024-02-02 | 上海凯来仪器有限公司 | Combined detection device and combined detection method for Raman-laser ablation-mass spectrum |
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