CN104390952A - Linear focus Raman scattering probe - Google Patents
Linear focus Raman scattering probe Download PDFInfo
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- CN104390952A CN104390952A CN201410776558.9A CN201410776558A CN104390952A CN 104390952 A CN104390952 A CN 104390952A CN 201410776558 A CN201410776558 A CN 201410776558A CN 104390952 A CN104390952 A CN 104390952A
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Abstract
The invention discloses a linear focus Raman scattering probe. The linear focus Raman scattering probe comprises a laser conduction optical fiber 2, a linear cylindrical lens group 3, a scattered light collecting lens group 5, a narrowband resistance high-pass light filter 6, a parallel light converging lens group 7 and a scattered light conduction optical fiber 8, wherein laser is coupled to the linear cylindrical lens group 3 by the laser conduction optical fiber 2 and forms parallel linear laser through the linear cylindrical lens group 3; Raman scattered light is generated after the linear laser is reflected or converged to a sample; the scattered light collecting lens group 5 collects the scattered light from the surface of the sample; the scattered light enters the parallel light converging lens group 7 through the narrowband resistance high-pass light filter 6 and is coupled to the scattered light conduction optical fiber 8. According to the linear focus Raman scattering probe, Raman spectrum is guided in front of a slit of a spectrometer to form linear scattered light; the linear scattered light irradiates to the incident slit of the spectrometer is overlapped with the incident slit, so that the incident efficiency of the Raman spectroscopy is greatly improved; the sensitivity of a portable Raman spectrometer is improved.
Description
Technical field
The present invention relates to a kind of optical device, can be portable or handheld Raman spectrometer and efficient laser raman scattering detecting head is provided.
Background technology
Raman scattering is a kind of inelastic optical scattering phenomenon produced after single-frequency incident light and material interact.Raman spectrum is the vibrational spectrum with molecular fingerprint information, can analyze and differentiate material (or molecule) kind quickly and accurately with it.It has been widely used in the fields such as physics, chemistry, material, biology, medical science, food, archaeology and criminal investigation.Raman spectroscopy take light as probe, it have untouchable, non-destructive, on-the-spot in real time, outside former state original position and the detection feature such as amount of samples is few, the advantage that spatial resolution is high and spectral resolution is high in addition.In addition, Raman spectroscopy can detect under the environmental baseline of routine particularly aqueous environment, has outstanding advantage compared with infrared spectrum technology.Since nineteen twenty-eight Raman scattering finds, Raman spectroscopy is subject to the extensive attention of scientific circles always, nearly ten years, Raman spectrometer progressively marches toward the mechanism such as inspection structure, quality supervision department of factory by research units such as scientific research institutions, and becomes the identification of means improving China scientific research level, people's living standard and the indispensable experiment research of guarantee social safety or routine.
Modern advanced manufacture the technical development comprising light source, light splitting and photodetection, be manufacture volume miniaturization, the Portable Raman spectrometer of Integration ofTechnologyization and Test Field provides technical support.Nowadays, the such as company such as B & WTEK, Ocean Optics, Thermo Scientific, DeltaNu, be proposed formula of the taking Raman spectrometer that performance is different from function, these equipment are mainly used in teaching, on-the-spot test, and a small amount of scientific research, and in occupation of our Raman spectrometer market.More domestic research institutions and colleges and universities also carry out the development work to small-sized Raman spectrometer, but do not accomplish market-oriented scale.
A principal feature of Portable Raman spectrometer adopts light transmitting fiber to be drawn by light signal, and light signal receiving unit adopts micro fiber spectrometer.Portable Raman spectrometer is by LASER Light Source, and Raman detection head and spectral analysis detecting unit, ccd detector and data acquisition/man-machine interface form.Aufbauprinciple is shown in Fig. 1.
Raman fiber detecting head is one of main element of Portable Raman spectrometer.The function of Raman fiber detecting head comprises laser conduction, Raman diffused light is collected and filter action.The laser that laser instrument exports is imported by Raman fiber detecting head and focuses on sample, makes it to act on sample.Meanwhile, Raman fiber detecting head collects Raman signal, and filtering comprises the non-Raman signal of laser and parasitic light, and is imported rear end spectrometer.Raman fiber detecting head by be less than the laser input optical fibre of 200 μm of diameters and be less than the scattered light output optical fibre (also claim conduction optical fiber) of 100 μm of diameters, parallel lens, band hinder (trap) or high optical filter, regular reflection prism etc. are formed thoroughly.FC or SMA905 modular connection made by the conduction optical fiber being less than 100 μm of diameters, or makees the joint that forming shape mates with entrance spectrometer slit.In addition, Raman fiber optic probe has remote detection in real time and (vacuum, low temperature/high temp/high pressure etc.) non-contacting in situ detection function under extreme condition.The birth of Raman fiber optic probe, has also promoted the research and apply field of Raman spectrometer greatly.
At present, as the fiber Raman detecting head of commodity selling on market, the rear scattering method that main structure adopts two optical fiber confocal coaxial mostly, exciting light and scattered light have common light path, by dichroic mirror, scattered light are focused on another root conduction optical fiber.Conduction optical fiber adopts single strand optical fiber, and this design comparison is simple, but after being connected with spectrometer, useful signal can lose nearly 80-90% in junction.Reason is, the entrance slit width of spectrometer is 10-20 μm, and the diameter of optical fiber is 100 μm, does not mate with slit width, thus can lose.Another Raman detection head adopts multiply optical fiber to do conduction optical fiber, multiply optical fiber is arranged the linear array changing approximate slit into by sub-circular, just has more multiple scattering light and enter slit, improves spectrometer measurement sensitivity several times.According to above-mentioned principle and the market demand thereof, there is the Raman fiber detecting head that different optical (road) constructs and continue to bring out.The Handheld Raman detecting head being CN102519937A as the patent No. is a with the automatic probe controlling laser and stablize and automatically sample; The patent No. is the Raman detection head of CN203132699U is the probe that a kind of photo measure and pick-up unit are used in conjunction, and has the effect strengthening Raman signal; The patent No. is the Raman fiber detecting head of CN201788152U is adopt spatial offset technology, to reduce the probe that optical element improves collection efficiency; The patent No. is the portable Raman fiber detecting head of CN203758916U is a focus adjustable joint, and detection universality is stronger.But these patented technologies are all the fiber Raman detecting heads designed for Laser Focusing is become point.Point focusing light path also has its shortcoming.Focus on less, though can spectral resolution be improved, light and the synergistic volume of material less, the signal intensity of Raman scattering will be reduced, affect the detection sensitivity of spectrometer.For exciting more Raman signal intensity, just must need larger laser power to excite.The increase of laser power must cause sample surface temperature to increase, even lesioned sample, and causes the Raman signal distortion of sample.Therefore, how to improve Raman collection efficiency further, remain a large problem of light path design.
Summary of the invention
The object of this invention is to provide a kind of linear focusing Raman scattering detection head.The present invention, under linear focusing mode, by increasing the area of illumination, adds Raman scattering volume, realizes increasing collecting Raman signal efficiency.
The object of the invention is by such technical scheme realize, a kind of linear focusing Raman scattering detection head, comprise light conduction optical fiber 2, linear cylindrical mirror lens combination 3, scattered light collecting lens group 5, arrowband resistance high-pass filter 6, directional light convergent lens group 7 and scattered light conduction optical fiber 8, laser coupled is formed parallel linear laser to linear mirror lens combination 3 through linear mirror lens combination by laser conduction optical fiber 2, linear laser is shape Raman light after sample surfaces scattering, scattered light collecting lens group 5 collects the scattered light from sample surfaces, scattered light enters into directional light convergent lens group 7 through arrowband resistance high-pass filter 6 and is coupled to scattered light conduction optical fiber.
Further, described linear cylindrical mirror lens combination 3 comprises parallel light tube, the orthogonal cylindrical mirror in axle center and convergent lens, the laser that laser conduction optical fiber 2 imports is transformed into the directional light of square focus spot by parallel light tube, and through axle center, orthogonal cylindrical mirror forms the wide linear laser of narrowband line to directional light; Described convergent lens focus overlaps with cylindrical mirror focus, and the linear laser of arrowband live width is shaped to parallel linear laser.
Further, described Raman scattering detection head also comprises parallel linear laser conduction device, and described parallel linear laser conduction device is used for parallel linear laser conduction to the surface of sample.
Further, described parallel linear laser conduction device is a part for scattered light collecting lens group 5; Or described parallel linear laser conduction device is total reflection lens group 9.
Owing to adopting technique scheme, the present invention has following advantage:
1, line focus is relative to point focusing, and scattering area increases, and Ramam effect significantly strengthens;
2, line focus is relative to point focusing, and the incident laser radiation of equal-wattage is on sample, and the luminous power spectral density on sample is low many.Under corresponding online focusing mode, the laser power of sample carrying is larger, can effectively prevent laser to the damage of sample;
3, line focus is relative to point focusing, and the focus of some shaped laser spot is far longer than the entrance slit of spectrometer, and most scattered light is blocked in outside spectrometer, and line focus overlaps with entrance spectrometer slit, greatly can improve the throughput of spectrometer.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is Portable Raman spectrometer schematic diagram of structure;
Fig. 2 lens focus probe system schematic diagram;
Fig. 3 focusing mirror probe system schematic diagram.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment one
As shown in Figure 2, linear focusing Raman scattering detection head, comprises LASER Light Source 1, laser conduction optical fiber 2, linear cylindrical mirror lens combination 3, scattered light collecting lens group 5, arrowband resistance high-pass filter 6, directional light convergent lens group 7 and scattered light conduction optical fiber 8.
Described linear cylindrical mirror lens combination 3 comprises parallel light tube, the orthogonal cylindrical mirror in axle center and convergent lens,
The laser coupled that LASER Light Source 1 is launched is to laser conduction optical fiber 2, and form parallel linear laser through laser conduction optical fiber 2 Conduction coupling to linear cylindrical mirror lens combination 3, the detailed process that linear cylindrical mirror lens combination forms parallel linear laser is:
The circular light spot laser in Gaussian distribution that laser instrument sends by parallel light tube is transformed into the directional light of square focus spot, through axle center, orthogonal cylindrical anamorph becomes the linear laser of arrowband live width to directional light after parallel light tube conduction, convergent lens focus overlaps with cylindrical mirror focus, and the linear laser of arrowband live width is shaped to parallel linear laser.
In the present invention, linear focusing Raman scattering detection head also comprises parallel linear laser conduction device, this parallel linear laser conduction device is a part for scattered light collecting lens group 5, parallel linear laser is focused at through scattered light collecting lens group 5 edge on sample 4 more also in line spot, scattered light collecting lens group 5 is collected from sample scattering Raman light out simultaneously, the Raman light scattered out becomes directional light after scattered light collecting lens group 5, then through arrowband resistance high-pass filter 6, the spectrum of filtering laser wavelength of incidence and following wave band, eliminate the interference to required Raman spectrum, light after optical filtering is coupled to scattered light conduction optical fiber 8 through directional light convergent lens group 7, then Raman spectrometer slit is imported to through scattered light conduction optical fiber 8, the entrance slit that the linear light scattering formed at its output port is mapped to miniature spectrometer overlaps with entrance slit.
Compared with traditional portable Raman probe, owing to eliminating two one-way mirror, light path of the present invention is the shortest, optical element minimum, add it is linear focusing, considerably increase the collection efficiency of Raman diffused light, and enhance the measurement sensistivity of Portable Raman spectrometer.
Embodiment two
As shown in Figure 3, in embodiment one, parallel linear laser conduction device is a part for scattered light collecting lens group, and the parallel linear laser conduction device in the present invention can also be total reflection lens group 9, and parallel linear laser is focused on sample 4 also in line spot through total reflection lens group again.
With adopt a part for collecting lens group as compared with parallel linear laser conduction device, the present embodiment adopts total reflection lens group to have the following advantages, owing to have employed the method for incident sideways, linear laser is no longer through scattered light collecting lens, the reflects laser avoided from sample surfaces directly enters collecting lens, greatly reduce elastic scattering signal like this and enter scattered light collecting lens, not only can reduce optical density (OD) the service index requirement of arrowband resistance high-pass filter, and the designing requirement decreased scattered light collecting lens and difficulty, in addition, this optical design also omit two one-way mirror, optical element reduce, all all serve the effect reducing and manufacture Raman detection head cost.This incident sideways linear focusing Raman scattering detection head not only increases the measurement sensistivity of Portable Raman spectrometer, and can improve the signal to noise ratio (S/N ratio) of spectrometer.
In sum, before Raman spectrum is imported to spectrograph slit by the present invention, to be formed on entrance slit that wire light scattering is mapped to spectrometer and to overlap with entrance slit, substantially increasing the incident efficiency of Raman spectrum, improve the sensitivity of Portable Raman spectrometer.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a linear focusing Raman scattering detection head, it is characterized in that: comprise laser conduction optical fiber (2), linear cylindrical mirror lens combination (3), scattered light collecting lens group (5), arrowband resistance high-pass filter (6), directional light convergent lens group (7) and scattered light conduction optical fiber (8), laser coupled is formed parallel linear laser to linear mirror lens combination (3) through linear cylindrical mirror lens combination by laser conduction optical fiber (2), linear laser is irradiated to scattering shape Raman light after sample surfaces, scattered light collecting lens group (5) collects the scattered light from sample surfaces, scattered light hinder through arrowband high-pass filter (6) enter into directional light convergent lens group (7) be coupled to scattered light conduction optical fiber (8).
2. linear focusing Raman scattering detection head according to claim 1, it is characterized in that: described linear cylindrical mirror lens combination (3) comprises parallel light tube, the orthogonal cylindrical mirror in axle center and convergent lens, the laser that laser conduction optical fiber (2) imports is transformed into the directional light of square focus spot by parallel light tube, and through axle center, orthogonal cylindrical mirror forms the wide linear laser of narrowband line to directional light; Described convergent lens focus overlaps with cylindrical mirror focus, and the linear laser of arrowband live width is shaped to parallel linear laser.
3. linear focusing Raman scattering detection head according to claim 1 and 2, it is characterized in that: described Raman scattering detection head also comprises parallel linear laser conduction device, described parallel linear laser conduction device is used for parallel linear laser conduction to the surface of sample.
4. linear focusing Raman scattering detection head according to claim 3, is characterized in that: described parallel linear laser conduction device is a part for scattered light collecting lens group (5).
5. linear focusing Raman scattering detection head according to claim 3, is characterized in that: described parallel linear laser conduction device is total reflection lens group (9).
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Cited By (7)
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| CN104949958A (en) * | 2015-06-26 | 2015-09-30 | 北京杏林睿光科技有限公司 | Novel Raman probe based on optical fiber beam splitter |
| CN106092884A (en) * | 2016-06-24 | 2016-11-09 | 北京华泰诺安探测技术有限公司 | A kind of laser activated spectroscopic detection probe and spectral method of detection |
| CN106290300A (en) * | 2016-08-04 | 2017-01-04 | 同方威视技术股份有限公司 | Portable raman spectrometer |
| CN108918498A (en) * | 2018-05-22 | 2018-11-30 | 中国空间技术研究院 | A kind of Raman probe for realizing line focus excitation |
| US10146047B1 (en) | 2017-10-11 | 2018-12-04 | Htc Corporation | Optical base station |
| CN113624733A (en) * | 2021-06-25 | 2021-11-09 | 港湾之星健康生物(深圳)有限公司 | High-efficiency scattered light condensing assembly |
| CN114732371A (en) * | 2022-06-13 | 2022-07-12 | 南京诺源医疗器械有限公司 | Raman spectrum probe and Raman spectrum detection device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949958A (en) * | 2015-06-26 | 2015-09-30 | 北京杏林睿光科技有限公司 | Novel Raman probe based on optical fiber beam splitter |
| CN104949958B (en) * | 2015-06-26 | 2024-02-20 | 北京杏林睿光科技有限公司 | Novel Raman probe based on optical fiber beam splitter |
| CN106092884A (en) * | 2016-06-24 | 2016-11-09 | 北京华泰诺安探测技术有限公司 | A kind of laser activated spectroscopic detection probe and spectral method of detection |
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| CN108918498A (en) * | 2018-05-22 | 2018-11-30 | 中国空间技术研究院 | A kind of Raman probe for realizing line focus excitation |
| CN113624733A (en) * | 2021-06-25 | 2021-11-09 | 港湾之星健康生物(深圳)有限公司 | High-efficiency scattered light condensing assembly |
| CN114732371A (en) * | 2022-06-13 | 2022-07-12 | 南京诺源医疗器械有限公司 | Raman spectrum probe and Raman spectrum detection device |
| CN114732371B (en) * | 2022-06-13 | 2022-08-19 | 南京诺源医疗器械有限公司 | Raman spectrum probe and Raman spectrum detection device |
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Application publication date: 20150304 |