CN104949958A - Novel Raman probe based on optical fiber beam splitter - Google Patents
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- CN104949958A CN104949958A CN201510360618.3A CN201510360618A CN104949958A CN 104949958 A CN104949958 A CN 104949958A CN 201510360618 A CN201510360618 A CN 201510360618A CN 104949958 A CN104949958 A CN 104949958A
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Abstract
The invention discloses a novel Raman probe based on an optical fiber beam splitter and relates to the technical field of optical equipment. Exciting light enters the probe through an input optical fiber, becomes parallel light through a collimating lens and then sequentially passes through a narrow-band pass filter, a dichroic mirror, a converging lens and a protecting window; the converging lens gathers the exciting light on a measured sample, Raman scattering light generated by the measured sample together with Rayleigh scattering light passes through the protecting window in the opposite direction to enter the probe, is collected through the converging lens and collimated and sequentially undergoes two-time 90-degree light beam transition through the dichroic mirror and a reflecting mirror, and then the Rayleigh scattering light is filtered out through a long wave pass filter; the remaining Raman scattering light is converged through a coupling lens to enter a collecting optical fiber and is equally distributed to an output optical fiber bundle through the beam splitter, and the tail end of the output optical fiber bundle is arranged into a straight line on a close packing module and then is in butt joint with a slit of a spectrometer. The optical fiber beam splitter is adopted to effectively improve the energy coupling efficiency of the probe to the spectrometer, and the novel Raman probe is simple in structure and easy to miniaturize.
Description
Technical field
The present invention relates to optical devices technologies field, be specifically related to a kind of novel Raman probe based on fiber optic splitter.
Background technology
Ramam effect is found by India physicist Raman, refers to the phenomenon that light wave frequency after being scattered changes.Illumination is mapped on material and elastic scattering and inelastic scattering occurs, the scattered light of elastic scattering is the composition (Rayleigh scattering light) identical with excitation wavelength, inelastically scattered scattered light (Raman diffused light) has the composition than excitation wavelength, also the composition shorter than excitation light wave is had, Raman spectrum analysis method analyzes the scattering spectrum different from exciting light frequency, to obtain molecular vibration, the information of rotation aspect, and be applied to a kind of analytical approach of molecular structure research, the characteristic of scatterer is depended in the change of scattered light frequency, the mode of different atomic group vibration is unique, therefore the scattered light of characteristic frequency can be produced, its spectrum is just called " Fingerprint ", principle can identify the molecular species of component like this.Therefore, Raman spectrum analysis is widely used in biology, mineral, the qualification of chemical substance and detection.Raman spectrometer based on Raman spectrum analysis technology has a good application prospect in fields such as food security, biological medicine, public safety, material science, gemstone testing, geological exploration, environment measurings.
Raman probe is the Primary Component of Raman spectrometer, for conducting excitation beam, collecting Raman spectrum.Because the Raman scattering signal of material is very weak, its signal intensity be Rayleigh scattering signal intensity 1,000,000/.Therefore, for improving precision and the sensitivity of Raman spectrum detection, Raman probe needs to stop Rayleigh scattering light to enter spectrometer as far as possible on the one hand, needs the collection, the utilization ratio that improve Raman scattering signal as much as possible on the other hand.At present, the impact reducing Rayleigh scattering mainly relies on the optical filter of high-quality.For the collection, the utilization ratio that how effectively to improve Raman spectrum, more common method is with being bundled the fibre bundle formed by multifiber at output terminal, simple optical fiber is replaced to increase collection area, or adopt multiple collection channel, the collection efficiency of Raman scattering is improved by multi-angle, hyperchannel.Above two kinds of methods are when docking with the slit of spectrometer, by multifiber is arranged in the straight line corresponding with spectrograph slit, the slit of spectrometer is directly docked than adopting separately a root receiving fiber, the utilization ratio of Raman signal can be significantly improved, thus improve the sensitivity of Raman detection, but go for larger collection area, the excitation area of sample is needed to amplify, corresponding convergent lens and the focal length of coupled lens all will increase thereupon, the volume of whole probe will be increased, and the collection mode of hyperchannel multi-angle is obviously also unfavorable for the miniaturization of system, its assembling and setting is also more complicated.
Summary of the invention
The object of the invention is to the defect for prior art and deficiency, a kind of novel Raman probe based on fiber optic splitter that a kind of structure is simple, reasonable in design, easy to use is provided.
In order to solve the problem existing for background technology, a kind of novel Raman probe based on fiber optic splitter of the present invention, it comprises input optical fibre, collimation lens, narrow-band pass filter, dichroic mirror, convergent lens, protecting window, catoptron, long wave pass filter, coupled lens, collection optical fiber, beam splitter, output fiber bundle, close arrangement module, the output optical fibre of laser instrument docks with input optical fibre, the right side of input optical fibre is disposed with collimation lens, narrow-band pass filter, dichroic mirror, convergent lens, protecting window, the side of protecting window is provided with sample, the downside of dichroic mirror is provided with catoptron, the left side of catoptron is disposed with long wave pass filter, coupled lens, collection optical fiber, collect optical fiber to be connected with beam splitter, beam splitter is connected with close arrangement module by output fiber bundle, and close arrangement module coordinates with spectrometer, exciting light enters probe from input optical fibre, directional light is become through collimation lens, then narrow-band pass filter is passed through successively, dichroic mirror, convergent lens and protecting window, exciting light is focused on sample by convergent lens, sample is excited after optical excitation and Raman scattering occurs, the Raman diffused light produced enters probe through protecting window in the other direction together with Rayleigh scattering light, collected by convergent lens and collimate, again successively after twice 90 degree of light beam steering of dichroic mirror and catoptron by long wave pass filter filtering Rayleigh scattering light, remaining Raman diffused light is assembled by coupled lens and is entered collection optical fiber, output optical fibre is evenly distributed to intrafascicular through beam splitter, dock with the slit of spectrometer after the end of output fiber bundle is arranged in a straight line on close arrangement module.
As preferably, the coaxial placement of described collimation lens, narrow-band pass filter, dichroic mirror, convergent lens, protecting window forms excitation light path; The coaxial placement of catoptron, long wave pass filter, coupled lens is formed collects light path; Excitation light path be arranged in parallel with collection light path; Dichroic mirror and excitation light path are arranged in angle of 45 degrees, and catoptron is arranged in angle of 45 degrees with collection light path, and dichroic mirror is vertical corresponding with catoptron.
As preferably, described input optical fibre can be simple optical fiber, the fibre bundle that also can be made up of multifiber.
As preferably, described collimation lens, convergent lens and coupled lens can be spherical lens, non-spherical lens, globe lens, free-form surface lens, GRIN Lens, or the mirror group be made up of multiple lens.
As preferably, described narrow-band pass filter has high permeability to exciting light, and the Raman diffused light that the Raman diffused light produce input optical fibre and sample produce has low transmitance.
As preferably, described dichroic mirror has high permeability to exciting light, has high reflectance to the Raman diffused light that sample produces.
As preferably, described protecting window seals probe light path and protects, and is coated with the anti-reflection film that the Raman diffused light produced exciting light and sample all has high permeability.
As preferably, described catoptron has high reflectance to the Raman diffused light that sample produces, and has antiradar reflectivity to exciting light.
As preferably, described long wave pass filter has high permeability to the Raman diffused light that sample produces, and has low transmission to exciting light.
As preferably, it is intrafascicular that described beam splitter is used for that the Raman diffused light collected in optical fiber is evenly distributed to output optical fibre, and the core diameter of the intrafascicular optical fiber of output optical fibre and numerical aperture are less than the core diameter and numerical aperture of collecting optical fiber.
As preferably, described close arrangement module is made up of the base plate and cover plate being carved with microflute, for being arranged exactly in line by output fiber bundle.
As preferably, described output fiber bundle is before arrangement, and the coat of fiber end face is stripped, and only retains fibre core and covering, and is coated with the anti-reflection film that the Raman diffused light produced sample has high permeability.
The invention has the beneficial effects as follows: directly collect Raman scattering light signal with simple optical fiber, be evenly distributed in fibre bundle by fiber optic splitter again, then fibre bundle is arranged on close arrangement module straight line to dock with the slit of spectrometer, do not need the collection area additionally increasing Raman diffused light like this, make the compact of probe, be convenient to integrated, simultaneously, as the core diameter of the fibre bundle of output terminal and numerical aperture all little than the core diameter and numerical aperture of collecting optical fiber, contrast only uses single same specification to collect the method for fiber alignment spectrograph slit, effectively can improve the energy coupling efficiency of probe to spectrometer, and, fiber optic splitter is a kind of ripe device, in optical communication field, the photosynthetic bundle of high power pumping, all have a wide range of applications in measuring instrument and meter, commercially easily obtain.
Accompanying drawing explanation
Fig. 1 is light path principle schematic diagram of the present invention.
Fig. 2 is the structural representation of close arrangement module in the present invention.
Fig. 3 is spectrograph slit cutting optical fibre core cross sections schematic diagram in the present invention.
Description of reference numerals: 101-laser instrument; 102-input optical fibre; 103-collimation lens; 104-narrow-band pass filter; 105-dichroic mirror; 106-convergent lens; 107-protecting window; 108-sample; 109-catoptron; 110-long wave pass filter; 111-coupled lens; 112-collects optical fiber; 113-beam splitter; 114-output fiber bundle; 115-close arrangement module; 116-spectrometer.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1-2, this embodiment adopts following technical scheme: it comprises input optical fibre 102, collimation lens 103, narrow-band pass filter 104, dichroic mirror 105, convergent lens 106, protecting window 107, catoptron 109, long wave pass filter 110, coupled lens 111, collects optical fiber 112, beam splitter 113, output fiber bundle 114, close arrangement module 115;
The narrow linewidth semiconductor laser that laser instrument 101 selects optical fiber to export, its output optical fibre is docked with the input optical fibre 102 of Raman probe, exciting light is transferred on the focal plane of collimation lens 103, directional light is become after collimation, then successively by narrow-band pass filter 104, dichroic mirror 105, convergent lens 106 and protecting window 107, exciting light is focused on sample 108 by convergent lens 106, sample 108 is excited after optical excitation and Raman scattering occurs, the Raman diffused light produced enters probe through protecting window 107 in the other direction together with Rayleigh scattering light, collected by convergent lens 106 and collimate, again successively after twice 90 degree of light beam steering of dichroic mirror 105 and catoptron 109 by long wave pass filter 110 filtering Rayleigh scattering light, remaining Raman diffused light is assembled to enter by coupled lens 111 and is collected optical fiber 112, be evenly distributed in output fiber bundle 114 through beam splitter 113, dock with the slit of spectrometer 116 after the end of output fiber bundle 114 is arranged in a straight line on close arrangement module 115.
Further, the coaxial placement of described collimation lens 103, narrow-band pass filter 104, dichroic mirror 105, convergent lens 106, protecting window 107 forms excitation light path; The coaxial placement of catoptron 109, long wave pass filter 110, coupled lens 111 is formed collects light path; Excitation light path be arranged in parallel with collection light path; Dichroic mirror 105 and excitation light path are arranged in angle of 45 degrees, catoptron 109 is arranged in angle of 45 degrees with collection light path, and dichroic mirror 105 is vertical corresponding with catoptron 109, in this light channel structure, dichroic mirror 105 and catoptron 109 are by light path folding, realize the collection mode of backward scattering, reduce probe size, be beneficial to miniaturization.
Further, described input optical fibre 102 is simple optical fibers, and core diameter is 105um, and covering 125um, N.A are 0.15.
Further, described collimation lens 103, convergent lens 106 and coupled lens 111 are spherical lenses, the effect of collimation lens 103 is collimation exciting lights, exciting light focuses on sample 108 by convergent lens 106 in the optical path forward, oppositely Raman diffused light and Rayleigh scattering light collected and collimate, the effect of coupled lens 111 is assembled to be coupled into by Raman diffused light to collect optical fiber 112.
Further, described narrow-band pass filter 104 pairs of exciting lights have high permeability, the Raman diffused light that the Raman diffused light produce input optical fibre 102 and sample 108 produce has low transmission, can the Raman diffused light that excites because exciting light transmits in input optical fibre 102 of filtering, the Rayleigh scattering light that simultaneously sample 108 can be stoped to produce oppositely enters laser instrument 101.
Further, described dichroic mirror 105 pairs of exciting lights have high permeability, have high reflectance to the Raman diffused light that sample 108 produces, it in the optical path forward through exciting light, dorsad through Rayleigh scattering light and reflects Raman scattered light.
Further, described protecting window 107 seals probe light path and protects, and is coated with the anti-reflection film that the Raman diffused light produced exciting light and sample 108 all has high permeability.
Further, the Raman diffused light that described catoptron 109 pairs of samples 108 produce has high reflectance, has antiradar reflectivity to exciting light, and it can also filtering part Rayleigh scattering light while reflects Raman scattered light.
Further, the Raman diffused light that described long wave pass filter 110 pairs of samples 108 produce has high permeability, and have low transmission to exciting light, it coordinates with dichroic mirror 105, catoptron 109 gas barrier met Rayleigh scattering light.
Further, described beam splitter 113 is for being evenly distributed in output fiber bundle 114 by the Raman diffused light collected in optical fiber 112, in output fiber bundle 114, the core diameter of optical fiber and numerical aperture are less than the core diameter and numerical aperture of collecting optical fiber 112, the beam splitter 113 adopted in the present embodiment is 1x7 port organization, the core diameter that namely input optical fibre collects optical fiber 112 is 200um, covering 242um, N.A is 0.22, in output fiber bundle 114, the core diameter of optical fiber is 105um, covering 125um, N.A are 0.15, and coupling efficiency is higher than 90%, and physical dimension is small and exquisite, be convenient to integrated.
Further, described close arrangement module 115 is made up of the base plate 201 and cover plate 202 being carved with microflute, for output fiber bundle 114 is arranged in line exactly, as shown in Figure 2, the material of base plate 201 and cover plate 202 is glass or silicon, microflute on base plate 201 adopts scribing, the technique of photoetching or corrosion makes, and cutting spacing is 127um, and the shape of cutting is V-type or trapezoidal.
Further, described output fiber bundle 114 is before arrangement, the coat of fiber end face is stripped, only retain fibre core and covering, inserted by optical fiber successively during arrangement in the microflute on base plate 201, holddown plate 202, with adhesive curing, and fiber end face is ground, then plate one deck has high permeability anti-reflection film to the Raman diffused light that sample 108 produces.
As shown in Figure 3, the width adopting slit is 50um, and 301 is slit section.In figure, left side adopts single core diameter 200um, the optical fiber of N.A0.22 collects Raman signal and the situation of docking with slit, do not accounted for 31.5% of whole core area by the part 302 that slit blocks, be evenly distributed because the light signal in multimode optical fiber fibre core is approximate, and consider to adopt the N.A of spectrometer 116 to be 0.15, therefore probe is about 14.6% to the energy coupling efficiency of spectrometer 116; In figure, right side is the situation using fiber optic splitter 113, by core diameter 200um, Raman signal collected by the optical fiber of N.A0.22, be evenly distributed to 7 core diameter 105um again, in the optical fiber of N.A0.15, and arranged and dock with slit in line, do not accounted for 58.3% of whole core area by the part 303 that slit blocks, consider that the coupling efficiency of beam splitter 113 is 90% again, under this scheme, probe is about 52.4% to the energy coupling efficiency of spectrometer 116, can improve about 3.5 times.
The above, only in order to technical scheme of the present invention to be described and unrestricted, other amendment that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (5)
1. the novel Raman probe based on fiber optic splitter, it is characterized in that: it comprises input optical fibre, collimation lens, narrow-band pass filter, dichroic mirror, convergent lens, protecting window, catoptron, long wave pass filter, coupled lens, collect optical fiber, beam splitter, output fiber bundle, close arrangement module, the output optical fibre of laser instrument docks with input optical fibre, the right side of input optical fibre is disposed with collimation lens, narrow-band pass filter, dichroic mirror, convergent lens, protecting window, the side of protecting window is provided with sample, the downside of dichroic mirror is provided with catoptron, the left side of catoptron is disposed with long wave pass filter, coupled lens, collect optical fiber, collect optical fiber to be connected with beam splitter, beam splitter is connected with close arrangement module by output fiber bundle, close arrangement module coordinates with spectrometer, exciting light enters probe from input optical fibre, directional light is become through collimation lens, then narrow-band pass filter is passed through successively, dichroic mirror, convergent lens and protecting window, exciting light is focused on sample by convergent lens, sample is excited after optical excitation and Raman scattering occurs, the Raman diffused light produced enters probe through protecting window in the other direction together with Rayleigh scattering light, collected by convergent lens and collimate, again successively after twice 90 degree of light beam steering of dichroic mirror and catoptron by long wave pass filter filtering Rayleigh scattering light, remaining Raman diffused light is assembled by coupled lens and is entered collection optical fiber, output optical fibre is evenly distributed to intrafascicular through beam splitter, dock with the slit of spectrometer after the end of output fiber bundle is arranged in a straight line on close arrangement module.
2. a kind of novel Raman probe based on fiber optic splitter according to claim 1, is characterized in that: the coaxial placement of described collimation lens, narrow-band pass filter, dichroic mirror, convergent lens, protecting window forms excitation light path; The coaxial placement of catoptron, long wave pass filter, coupled lens is formed collects light path; Excitation light path be arranged in parallel with collection light path; Dichroic mirror and excitation light path are arranged in angle of 45 degrees, and catoptron is arranged in angle of 45 degrees with collection light path, and dichroic mirror is vertical corresponding with catoptron.
3. a kind of novel Raman probe based on fiber optic splitter according to claim 1, is characterized in that: described close arrangement module is made up of the base plate and cover plate being carved with microflute; For output fiber bundle is arranged in line exactly.
4. a kind of novel Raman probe based on fiber optic splitter according to claim 1, it is characterized in that: it is intrafascicular that described beam splitter is used for that the Raman diffused light collected in optical fiber is evenly distributed to output optical fibre, and the core diameter of the intrafascicular optical fiber of output optical fibre and numerical aperture are less than the core diameter and numerical aperture of collecting optical fiber.
5. a kind of novel Raman probe based on fiber optic splitter according to claim 1, it is characterized in that: described output fiber bundle is before arrangement, the coat of fiber end face is stripped, only retain fibre core and covering, and be coated with the anti-reflection film Raman diffused light of sample generation to high permeability.
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| CN106770182B (en) * | 2017-03-24 | 2023-11-21 | 钢研纳克检测技术股份有限公司 | Portable Raman spectrometer with CCD turning light path |
| CN107144555A (en) * | 2017-04-14 | 2017-09-08 | 浙江澍源智能技术有限公司 | A kind of wearable fibre-optical probe |
| CN108132236A (en) * | 2018-01-16 | 2018-06-08 | 北京首量科技股份有限公司 | A kind of Raman detection device that can be imaged |
| CN108132236B (en) * | 2018-01-16 | 2024-05-17 | 北京首量科技股份有限公司 | Raman detection device capable of imaging |
| CN109975210A (en) * | 2019-04-28 | 2019-07-05 | 重庆冠雁科技有限公司 | A kind of bare engine module of handheld Raman spectrometer |
| CN110412009A (en) * | 2019-07-25 | 2019-11-05 | 湖北省药品监督检验研究院 | A kind of ultraviolet Raman spectrometer |
| CN111413315A (en) * | 2020-03-31 | 2020-07-14 | 西安电子科技大学 | Probe type Raman spectrometer based on Bessel light |
| CN111579544A (en) * | 2020-05-25 | 2020-08-25 | 重庆冠雁科技有限公司 | Method capable of simultaneously measuring visible near infrared spectrum and Raman spectrum of substance |
| CN111766228A (en) * | 2020-07-14 | 2020-10-13 | 中国科学院西安光学精密机械研究所 | Non-invasive Raman fiber probe |
| CN112525886A (en) * | 2020-12-07 | 2021-03-19 | 上海新产业光电技术有限公司 | Raman spectrum device |
| CN112964692A (en) * | 2021-02-05 | 2021-06-15 | 上海新产业光电技术有限公司 | Raman spectrum device |
| CN113093223A (en) * | 2021-04-12 | 2021-07-09 | 广州降光科技有限公司 | Laser ceilometer |
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