CN104964964A - Portable laser raman spectrometer based on prismatic decomposition - Google Patents
Portable laser raman spectrometer based on prismatic decomposition Download PDFInfo
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- CN104964964A CN104964964A CN201510445153.1A CN201510445153A CN104964964A CN 104964964 A CN104964964 A CN 104964964A CN 201510445153 A CN201510445153 A CN 201510445153A CN 104964964 A CN104964964 A CN 104964964A
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Abstract
The invention relates to a portable laser raman spectrometer based on prismatic decomposition. The portable laser raman spectrometer comprises a laser, an optical filter, a prismatic decomposition system, a converging lens group, an area array CCD, an electrical control module, a computer, a power supply and a shell, wherein the laser emitted by the laser irradiates a substance to be tested, the scattered light in the horizontal direction passes through the optical filter to enter the prismatic decomposition system to be subjected to chromatic dispersion, the scattered light subjected to chromatic dispersion is converged on the light sensitive surface of the area array CCD, the area array CCD records a spectrum image, the spectrum image is input into the computer through the electrical control module to be processed into a one-dimensional raman spectrum. According to the spectrometer, the raman scattering light excitation efficiency is improved by adopting 405nm laser, meanwhile, the sensitivity and the signal to noise ratio of the laser raman spectrometer are effectively enhanced by utilizing the characteristics of high utilization rate of prismatic decomposition light, high resolution at a short wave section, and the parallel analysis capability of the area array CCD.
Description
Technical field
The present invention relates to a kind of raman spectroscopy measurement instrument, particularly relate to a kind of portable laser Raman spectrometer based on prismatic decomposition.
Background technology
Raman scattering be medium molecule to the inelastically scattered one of incident photon, nineteen twenty-eight C.V. Raman Late Cambrian.Because raman spectral characteristics is direct and medium molecule vibrates or rotational energy level is relevant, therefore Raman spectrum analysis technology has become the effective means of the qualification of research material molecular structure and material.The method does not need to carry out pre-service to sample, measure for undamaged qualitative and quantitative analysis, have simple to operate, measuring speed is fast, the advantages such as sensitivity is low, have been widely used in the fields such as material, chemical industry, oil, macromolecule, biology, environmental protection, geology at present.
Raman spectrometer is used for the high-acruracy survey of the Raman spectrum of material, is the basis of Raman spectrum analysis technology.Typical case's Raman spectrometer structure comprises laser instrument, entrance slit, collimation lens, dispersion system, focusing system, exit slit, photodetector and signal processing system composition.Because general Raman signal is very weak, accurate complicated optical devices are needed to measure.Current existing Raman spectrometer adopts grating to carry out light splitting mostly, and photomultiplier or single photon counter, as photodetector, record complete spectrum figure by long length scanning, as patent CN201247201Y laser raman fluorescence spectrophotometer.As a kind of beam splitter, it is high that grating has resolution, and form the advantage that normal spectrum is convenient to calibrate and correct, but to there is optical energy loss large simultaneously, spectral order overlaps, and easily occurs the shortcomings such as false spectral line.Meanwhile, this kind of Raman spectrometer also has bulky, complex structure and the shortcoming such as to involve great expense.
Summary of the invention
Technical matters to be solved by this invention overcomes above-mentioned the deficiencies in the prior art, there is provided a kind of structure rationally, volume is little, operation is convenient, system cost is low, faint raman spectral signal can be realized detect fast, detection sensitivity and the high portable laser Raman spectrometer based on prismatic decomposition of signal to noise ratio (S/N ratio).
The technical scheme that the present invention solves the problems of the technologies described above employing is, a kind of portable laser Raman spectrometer based on prismatic decomposition, comprise laser instrument, optical filter, prism splitter system, convergent lens group, area array CCD, electronic control module, computing machine, power supply and housing, described laser instrument is arranged on front side of housing by fixed mount, described optical filter, prism splitter system, convergent lens group and area array CCD are all placed in the housing of sealing, electronic control module is fixed on housing rear end panel, it is characterized in that: described prism splitter system comprises slit, collimation lens and Amici prism, laser instrument Emission Lasers irradiates solid-state or liquid test substance, scattered light signal to be measured is by entering the slit of prism splitter system after optical filter filtering Mie scattering and Rayleigh scattering light, parallel lines light source is formed through collimation lens, through Amici prism dispersion, the corresponding different refractive direction of different wave length monochromatic light, focus on area array CCD photosurface through convergent lens group, area array CCD spectra re-recorded image, carry out process through electronic control module input computing machine and generate one dimension Raman spectrum.
The present invention adopts 405nm laser instrument to improve Raman diffused light launching efficiency, take full advantage of prism splitter system in the high resolving power characteristic of skip band and high-light-energy utilization factor simultaneously, and the parallel parsing ability of area array CCD, effectively enhance sensitivity and the signal to noise ratio (S/N ratio) of laser Raman spectrometer, the faint raman spectral signal of water, white wine etc. can be measured in real time.Against existing technologies, described laser Raman spectrometer, not by external light influence, directly can be measured under normal indoor illumination, and transparent wrapper test substance is without the need to sampling, can direct nondestructive measurement.Structure of the present invention is simple, and be easy to processing and debug, production cost is low, and volume is little, easy to carry, and operation is convenient.
Accompanying drawing explanation
Fig. 1 is that the present invention forms structural principle schematic diagram.
Fig. 2 is the Raman spectrogram of the commercially available white wine that the present invention measures under normal indoor photoenvironment.
Label in figure is: 1. laser instrument, 2. test substance, 3. optical filter, 4. prism splitter system, 5. convergent lens group, 6. area array CCD, 7. electronic control module, 8. computing machine, 9. power supply, 10. housing, 11. laser holders, 12. laser power supply lines.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of portable laser Raman spectrometer based on prismatic decomposition, by laser instrument (1), optical filter (3), the compositions such as prism splitter system (4), convergent lens group (5), area array CCD (6), electronic control module (7), computing machine (8), power supply (9) and housing (10).
The effect of the housing (10) of sealing of the present invention is the relative position of fixed laser (1), optical filter (3), prism splitter system (4), focus lens group (5) and area array CCD (6), reduces the interference of external stray light simultaneously.Its front console there is clear aperature, embedded optical filter (3), its rear end panel is fixed electronic control module (7), the power switch key of corresponding electronic control module, power light, 12V power interface, laser power supply interface and USB interface; Facilitate external control or connect with computing machine (8), 12V power supply (9).
Laser power supply line (12) of the present invention is drawn by the laser power supply interface of electronic control module (7), and its effect is laser instrument (1) power supply.
Laser instrument of the present invention (1) Emission Lasers wavelength 405nm, power 100mW, having continuous, pulse two kinds of working methods, is common commercial product.
Optical filter of the present invention (3) is that 405nm with hinders optical filter, is common commercial product, and its effect is Mie scattering in filtering scattered light signal and Rayleigh scattering light.
Convergent lens group (5) of the present invention is common commercial camera lens, is no longer described in further detail at this.
Area array CCD of the present invention (6) is the digital area array CCD carrying analog-digital conversion function, is general-purpose device.
Electronic control module of the present invention (7) is embedded with power switch key, power light, 12V power interface, laser power supply interface and USB interface.
Computing machine of the present invention (8) is provided with exclusive data process software, for the process of Raman spectrum, display and storage.
Prism splitter system of the present invention (4) comprises slit, collimation lens and Amici prism, and its effect is the monochromatic light of different wave length by the Raman scattering signal chromatic dispersion to be measured of incidence.Scattered light signal to be measured is by entering prism splitter system slit after optical filter filtering Mie scattering and Rayleigh scattering light, parallel lines light source is formed by collimation lens, through Amici prism dispersion, the corresponding different refractive direction of different wave length monochromatic light, focus on area array CCD (6) photosurface through convergent lens group (5), described area array CCD (6) spectra re-recorded image, through USB interface input computing machine (8) of electronic control module (7), carries out process and generates one dimension Raman spectrum.Prism splitter system of the present invention (4), its main beam splitter---Amici prism can be single prism or polygon prism group.
Prismatic decomposition has that spectrum is bright, light intensity utilization factor is high, the advantages such as spectral order is not overlapping.Meanwhile, although prismatic decomposition spectrum exists nonlinear problem, it has good wavelength resolution in skip band.Raman scattering coefficient and excitation laser wavelength are inversely proportional to, and therefore adopt skip band laser excitation test substance Raman diffused light can obtain higher efficiency.The present invention adopts compared with the laser of short-wave band as exciting light, and prism carries out light splitting and can make full use of the high advantage of prismatic decomposition capacity usage ratio and in the higher wavelength resolution characteristic of short-wave band, make it be specially adapted to the detection of faint raman spectral signal.In addition, the laser Raman spectrometer based on prismatic decomposition also has aberration correction ratio and is easier to, and structure is simple, be easy to manufacture, easy to maintenance, low cost and other advantages.
Detailed process of the present invention is: laser instrument (1) is launched the solid-state or liquid test substance (2) of 405nm laser direct irradiation and excited generation Mie scattering, Rayleigh scattering and Raman scattering light signal, light hole receive horizontal direction scattered light signal and through optical filter (3) filtering Mie scattering wherein and Rayleigh scattering light, allow the low-loss of Raman scattering light signal through, incide prism splitter system (4) dispersion, the corresponding different refractive direction of different wave length monochromatic light, area array CCD (6) photosurface is focused on through convergent lens group (5), area array CCD (6) spectra re-recorded image, through USB interface input computing machine (8) of electronic control module (7), carry out process and generate one dimension Raman spectrum, and show, store, it measures Raman spectrum scope 300-3000cm
-1, spectral resolution 10cm
-1.
Fig. 2 is the Raman spectrogram of the commercially available white wine using the present invention directly to measure under normal indoor photoenvironment, and visible described a kind of portable laser Raman spectrometer based on prismatic decomposition has good resolution.
The present invention adopts 405nm laser instrument to improve Raman light launching efficiency, make use of the high-light-energy utilization factor of prismatic decomposition and the high resolving power characteristic in skip band thereof simultaneously, and the parallel parsing ability of area array CCD, effectively enhance sensitivity and the signal to noise ratio (S/N ratio) of laser Raman spectrometer, and adopt background deduction algorithm to make it not affect by external stray light, directly can measure under normal indoor illumination, transparent wrapper test substance, can direct nondestructive measurement without the need to sampling.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (1)
1. the portable laser Raman spectrometer based on prismatic decomposition, comprise laser instrument, optical filter, prism splitter system, convergent lens group, area array CCD, electronic control module, computing machine, power supply and housing, described laser instrument is arranged on front side of housing by fixed mount, described optical filter, prism splitter system, convergent lens group and area array CCD are all placed in the housing of sealing, electronic control module is fixed on housing rear end panel, it is characterized in that: described prism splitter system comprises slit, collimation lens and Amici prism; Laser instrument Emission Lasers irradiates solid-state or liquid test substance, scattered light signal to be measured is by entering the slit of prism splitter system after optical filter filtering Mie scattering and Rayleigh scattering light, parallel lines light source is formed through collimation lens, through Amici prism dispersion, the corresponding different refractive direction of different wave length monochromatic light, focus on area array CCD photosurface through convergent lens group, area array CCD spectra re-recorded image, carry out process through electronic control module input computing machine and generate one dimension Raman spectrum.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770139A (en) * | 2017-02-15 | 2017-05-31 | 哈尔滨工业大学（威海） | A kind of miniature Ultraluminescence LED light spectrum torch |
| CN107064084A (en) * | 2017-03-13 | 2017-08-18 | 哈尔滨工业大学（威海） | Microminiature laser fluorescence spectrum instrument and spectral method of detection |
| CN107831155A (en) * | 2017-12-05 | 2018-03-23 | 威海职业学院 | Multi-wavelength timesharing excites the remote sensing device and detection method of fluorescent material in water |
| CN108956580A (en) * | 2016-03-21 | 2018-12-07 | 重庆邮电大学 | A kind of Portable element analyzer can be used for field exploration |
| CN109580581A (en) * | 2018-12-12 | 2019-04-05 | 哈尔滨工业大学（威海） | A kind of laser Raman spectrometer based on composite grating |
| CN109580582A (en) * | 2018-12-12 | 2019-04-05 | 哈尔滨工业大学（威海） | A kind of laser Raman spectrometer based on compound Amici Prism group |
| CN114660037A (en) * | 2022-05-23 | 2022-06-24 | 山东交通学院 | Oil film measuring device and method based on differential Raman composite fluorescence spectrum |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108956580A (en) * | 2016-03-21 | 2018-12-07 | 重庆邮电大学 | A kind of Portable element analyzer can be used for field exploration |
| CN108956580B (en) * | 2016-03-21 | 2020-09-22 | 重庆邮电大学 | Portable element analyzer for field survey |
| CN106770139A (en) * | 2017-02-15 | 2017-05-31 | 哈尔滨工业大学（威海） | A kind of miniature Ultraluminescence LED light spectrum torch |
| CN106770139B (en) * | 2017-02-15 | 2023-10-13 | 哈尔滨工业大学（威海） | Miniature ultraviolet fluorescence LED spectrum flashlight |
| CN107064084A (en) * | 2017-03-13 | 2017-08-18 | 哈尔滨工业大学（威海） | Microminiature laser fluorescence spectrum instrument and spectral method of detection |
| CN107064084B (en) * | 2017-03-13 | 2023-10-17 | 哈尔滨工业大学（威海） | Microminiature laser fluorescence spectrometer and spectrum detection method |
| CN107831155A (en) * | 2017-12-05 | 2018-03-23 | 威海职业学院 | Multi-wavelength timesharing excites the remote sensing device and detection method of fluorescent material in water |
| CN109580581A (en) * | 2018-12-12 | 2019-04-05 | 哈尔滨工业大学（威海） | A kind of laser Raman spectrometer based on composite grating |
| CN109580582A (en) * | 2018-12-12 | 2019-04-05 | 哈尔滨工业大学（威海） | A kind of laser Raman spectrometer based on compound Amici Prism group |
| CN109580582B (en) * | 2018-12-12 | 2021-06-22 | 哈尔滨工业大学（威海） | Laser Raman spectrometer based on composite Amisy prism group |
| CN114660037A (en) * | 2022-05-23 | 2022-06-24 | 山东交通学院 | Oil film measuring device and method based on differential Raman composite fluorescence spectrum |
| CN114660037B (en) * | 2022-05-23 | 2022-08-26 | 山东交通学院 | Oil film measuring device and method based on differential Raman composite fluorescence spectrum |
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Application publication date: 20151007 |