CN105784643A - Device and method for reducing fluorescent background of gas Raman spectrum - Google Patents
Device and method for reducing fluorescent background of gas Raman spectrum Download PDFInfo
- Publication number
- CN105784643A CN105784643A CN201610128583.5A CN201610128583A CN105784643A CN 105784643 A CN105784643 A CN 105784643A CN 201610128583 A CN201610128583 A CN 201610128583A CN 105784643 A CN105784643 A CN 105784643A
- Authority
- CN
- China
- Prior art keywords
- polarization
- signal
- raman
- light
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/51—Scattering, i.e. diffuse reflection within a body or fluid inside a container, e.g. in an ampoule
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/51—Scattering, i.e. diffuse reflection within a body or fluid inside a container, e.g. in an ampoule
- G01N2021/513—Cuvettes for scattering measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a device and method for reducing a fluorescent background of a gas Raman spectrum.According to the device, a polarization modulation device conducts periodic polarization modulation on scattered light when a gas sample is analyzed; the intensity of a Raman signal of the gas sample with the good polarization characteristic periodically changes accordingly, the polarization direction of a fluorescence signal coming from the gas sample or a sample room or an optical element and the like has little correlation with the polarization direction of excitation light, and therefore the intensity of the fluorescence signal on a detector basically does not change along with rotating of the polarization modulation device; through a lock-in amplifying method, a gas Raman scattering signal can be detected in the fluorescent background.Accordingly, the influences of the fluorescent background can be reduced, and the detection capacity of the device on weak gas components can be improved; the device is simple and clear in structural layout and convenient to operate and has the very high practicability.
Description
Technical field
The invention belongs to field of optical measuring technologies, more particularly, to a kind of device reducing Raman spectrum fluorescence background, this device is particularly suited for reducing the fluorescence owing to optical element and sample room etc. in Raman scattering device produce and the continuous spectrum background brought.
Background technology
Raman scattering is the inelastic scattering phenomenon of a kind of photon.One monochromic beam, after sample media scattering, can produce a kind of scattering light having specific frequency shift relative to exciting light, and this specific frequency displacement is corresponding to the vibration of sample molecule/atom, energy difference between rotation or electron energy level；Therefore by Raman scattering techniques the composition of sample can be carried out qualitative or determine quantitative analysis.Raman scattering techniques is widely used in the numerous areas such as environmental monitoring, energy gas detection, medical treatment detection due to advantages such as Noninvasive, the sample size having are little, analysis speed is fast.Intensity yet with spontaneous Raman scattering is very faint, generally low 67 orders of magnitude than incident intensity；And exciting light is likely to the fluorescence of excited gas sample, sample room and optical element while exciting sample Raman scattering, and then causes that the Raman spectrum obtained has higher continuous background, floods the Raman signal that part is faint.Therefore, it is particularly important to the enhancing of Raman signal with to the suppression of continuous background.
Early stage Weber et al. (AlfonsWeber, etal., " HighresolutionRamanspectroscopyofgaseswithcw-laserexcita tion; " J.Opt.Soc.Am.57,19-27 (1967)) utilize interior cell method and multiple echo method to obtain the interaction distance and bigger scattering light collection solid angle, the Raman spectrum higher to obtain signal to noise ratio of the exciting light of high intensity, longer laser and material.But owing to interior cell method is likely to the unstability of loss and the laser power increasing Optical Maser System, thus research worker seeks additive method.The good restrictive and low-loss that transmitted laser beam is shown by photonic crystal fiber (PCF) in high power laser light transmits has attracted the attention of research worker, they are using hollow PCF as gas sample chamber, pumping laser is coupled into its inner core (hollows of central authorities), the interaction distance of laser and sample can be increased again while obtaining high power density exciting light, and optical fiber can also retrain in the scattering light core within it excited and propagate to two ends, thus corresponding scattering light is collected also easier.Buric et al. (MichealP.Buric, etal., " EnhancedspontaneousRamanscatteringandgascompositionanaly sisusingaphotoniccrystalfiber; " AppliedOptics47,4255-4261 (2008)) report and utilize the PCF Raman spectrum with the higher signal-to-background ratio ratio of continuous background intensity (the signal relative intensity with) obtaining O2 and N2 in air.Common commercial hollow PCF core diameter is only several micron, is unfavorable for gas flowing wherein and emptying, and therefore the Raman detection system of Based PC F is not particularly suited for industry monitoring in real time.Therefore, research worker transfers to utilize the inwall with similar enhancing principle to have the capillary tube of the coat of metal to substitute PCF to reach the purpose of monitoring in real time.Buric et al. (MichealP.Buric, etal., " IndustrialRamangassensingforreal-timesystemcontrol; " Proc.SPIE9083,90830U (2014)) report a set of industrial Raman gas sensing and controlling system based on the capillary tube that internal diameter is 300 microns, inwall metal-plated membrane and dielectric layer, multiple gases can be carried out the real-time monitoring of the information such as concentration by it.No matter it is hollow PCF, or coat of metal capillary tube, all likely there is a small amount of pump laser radiation to enter in the glass wall of outer.Owing in glass wall, the fluorescence excitation cross section of the material such as silicon dioxide is far longer than the raman scattering cross section of gaseous sample; tube wall would generally introduce the fluorescence that intensity is higher, spectral line is wider; thus causing that acquired Raman spectrum has stronger continuous background, and then cause that the Raman signal of part micro constitutent gas is submerged in the background.For improving the detection sensitivity of Raman system, research worker seeks various method to suppress the intensity of continuous background in Raman spectrum.nullOkita et al. (Y.Okita,etal.,“ARamancellbasedonhollowopticalfibersforbreathanalysis,”Proc.SPIE7559,755908 (2010)) metal sleeve is installed additional at capillary tube end face，And Buric et al. (MichealP.Buric,etal.,“Designandindustrialtestingofultra-fastmulti-gasRamanspectrometer,”Proc.SPIE8726,87260K (2013)) also belong to film in capillary tube end face plated with gold，To stop exciting light enter capillary wall and come from the fluorescence entrance collection system of capillary wall，Thus suppress the intensity of continuous background Raman spectrum from source.In addition, Buric et al. (MichaelP.Buricetal., " ImprovedsensitivitygasdetectionbyspontaneousRamanscatter ing; " Appl.Opt.48 (22), 4424-4429 (2009) .) also add aperture or spatial filter in the optical path, in the fluorescence produce capillary wall and inner core, the Raman diffused light of gaseous sample is spatially easily separated, to reduce the fluorescence entered in scattering light collecting system, thus reaching to suppress the purpose of continuous background.Due in capillary system, the border that the distribution spatially of the fluorescence coming from tube wall and the Raman diffused light of the gaseous sample coming from inner core is not strict, and they propagate to collect system process in also can partial hybrid, therefore the method for the above can only suppress the intensity of continuous background to a certain extent；Corresponding technique is had high requirement by the method for this external port metal-coated membrane and added metal sleeve, adds the difficulty that sample room makes.
Even if not using hollow PCF or the sample cell of this tight constraint of coat of metal capillary tube, the rete and sample cell wall etc. of the fluorescence of gaseous sample itself, transmission optical component base material and rete, reflective optical devices are all likely to bring the interference of the continuous backgrounds such as fluorescence.2012, it is proposed that gas density is carried out periodic perturbation, method (a kind of system removing Raman scattering background of gas Raman scattered signal is detected with phase-locked amplifying method, Chinese patent ZL201210136681.5), the method can reduce optical element and the impact of sample cell wall fluorescence signal, but cannot eliminate the impact of the fluorescence signal of gaseous sample own.
Gas Raman signal has strong polarization characteristic, and the depolarized rate (depolarizationratio) of common gas is about a few percent.And fluorescence is usually what the molecule excited produced after multiple impacts relaxation, do not possess polarization characteristic.For detecting the Raman scattering signal of needs in complex environment signal, the method for Polarization Detection can be taked to suppress the intensity of continuous background.Egermann et al. (JanEgermann, etal., " Applicationof266-nmand355-nmNd:YAGlaserradiationforthein vestigationoffuel-richsootinghydrocarbonflamesbyRamansca ttering; " Appl.Opt.43,5564-5574 (2004)) use the Raman scattering techniques polarizing resolution, obtain the Raman spectrum of the low continuous background of each gas componant in methyl hydride combustion flame.This background suppression method adopting polarization resolved Raman spectra utilizes linear polarization excitation Raman scattering, collection is parallel to exciting light polarization direction and is perpendicular to this two-part Raman spectrum of exciting light polarization direction and subtracts each other, to reduce continuous background, to extract the purpose of faint Raman signal.But often need two spectrogrphs to be acquired due to the method, therefore whole system structure relative complex, operating process is relatively cumbersome, is unfavorable for portability and the miniaturization of Raman detection system.
Additionally, the method for some signal processing also studied personnel are used for the continuous background eliminating in Raman spectrum, for instance to the polynomial fitting method of continuous background, fourier transform method and wavelet analysis method etc..But these methods are all based on greatly the post-processing method of the Raman spectrum obtained, being submerged in continuous background faint Raman signal can not be resumed out, and therefore these methods can not the power of test to small-signal of substantial raising system.
Summary of the invention
For the development being unfavorable for portability and miniaturization of Raman detection system and defect to Detection of Weak Signals scarce capacity in prior art, it is an object of the invention to aim to solve the problem that problem above.
For achieving the above object, the invention provides a kind of device reducing Raman spectrum fluorescence background, it is characterized in that, described device includes: laser instrument, gas sample cell, light beam coupling collection device, polarization modulating arrangement, opto-electronic receiver conversion equipment, signal generator, lock-in amplifier and signal output device；
The laser coupled that described laser instrument sends is entered described gas sample cell by described light beam coupling collection device；Simultaneously by collecting and collimating the mixed polarized light coming from described gas sample cell, propagate to polarization modulating arrangement；
Described mixed polarized light is carried out polarization and adjusts and be classified as two parts by described polarization modulating arrangement, and a part keeps the former direction of propagation to continue along optical axis, and another part is dissipated or is perpendicular to optical axis after reflection；
Collimated beam after Polarization Modulation is converted to the corresponding signal of telecommunication and sends in described lock-in amplifier by described opto-electronic receiver conversion equipment；
Described signal generator controls described polarization modulating arrangement and with modulating frequency f described mixed polarized light carries out Polarization Modulation, and modulation frequency signal is connected to described lock-in amplifier as reference signal by it；
Described signal output device utilizes the reference signal that described lock-in amplifier combination are sent into by described signal generator can be extracted from continuous background by the Raman signal collected and finally show.
Preferably, described light beam coupling collection device includes lens, dichroic mirror and optical filter.
Preferably, described polarization modulating arrangement includes polarization beam splitter prism fixture, the automatically controlled turntable of hollow and polarization beam splitter prism；Mixed polarized light is divided into two bundles by described polarization beam splitter prism, and the former direction of propagation of a branch of maintenance is continued along optical axis, and another bundle is perpendicular to optical axis after reflection, and by the heat sink dissipation of the absorption of periphery；Under the drive of the automatically controlled turntable of described hollow, polarization beam splitter prism rotates along optical axis, can realize the Polarization Modulation to incident collimated light beams.
Preferably, described polarization modulating arrangement includes liquid crystal optics shutter and its controller；Described signal generator periodically-varied liquid crystal shutter controller puts on the voltage on liquid crystal wave plate and comes the periodically-varied polarization gating direction by light beam, reaches the Polarization Modulation to incident beam.The light radiation being perpendicular to polarization gating direction is dissipated by liquid crystal optics shutter.
Preferably, described opto-electronic receiver conversion equipment includes bigbore imaging lens, monochromator and high sensitivity unit light electric explorer.Collimated beam after Polarization Modulation is directly collected by imaging lens and is coupled in monochromator, and cooperation high sensitivity unit light electric explorer can quick detection small-signal.
According to another aspect of the present invention, it is provided that based on the method reducing Raman spectrum fluorescence background of polarization characteristic in the detection of a kind of gas Raman, it is characterised in that said method comprising the steps of:
(1) utilize described light beam coupling collection device that the laser coupled that described laser instrument sends is entered described gas sample cell；Utilize described light beam coupling collection device to collect simultaneously and collimation is from the backward Raman scattering light of described gas sample cell, propagate to described polarization modulating arrangement after filtration；
(2) control described polarization modulating arrangement by described signal generator, with modulating frequency f, described mixed polarized light is carried out Polarization Modulation；
(3) utilize described opto-electronic receiver conversion equipment that the collimated beam after Polarization Modulation is converted to the corresponding signal of telecommunication to send in described lock-in amplifier；
(4) reference signal that described lock-in amplifier combination are sent into by described signal generator is utilized can be extracted from continuous background by the Raman signal collected and be eventually displayed on described signal output device.
By the above technical scheme that the present invention is contemplated, compared with prior art, it is possible to obtain following beneficial effect:
(1) instant invention overcomes the system caused in the gas Raman detection process problem to the faint composition detection scarce capacity of sample due to the impact of continuous background.Native system is based on the Raman detection method of Polarization Modulation.Adopt the laser with linear polarization characteristic as excitation source, before the collection device of common Raman scattering system, add polarization modulating arrangement, adopt the monochromator of coupling high sensitivity unit light electric explorer as Raman Scattering Spectra analytical equipment.
(2) assembly of the invention is when analyzing gaseous sample, makes polarization modulating arrangement that scattering light is carried out periodic Polarization Modulation；The power of the gaseous sample Raman signal with good polarization characteristic can cyclically-varying therewith, and it is only small with exciting light polarization direction dependency to derive from the polarization direction of the fluorescence signal of gaseous sample, sample room or optical element etc., the fluorescence signal power on detector does not substantially change with the rotation of polarization modulating arrangement；So, carry out phase-locked amplification with the modulation signal of polarization modulating arrangement for reference signal, the Raman signal of gas can be extracted from continuous print fluorescence background, thus reducing the impact that continuous background is brought.
(3) system provided by the invention is simple and clear compared to topology layout the Raman system that conventional polarization is differentiated, easy to operate, and can suppress the intensity of continuous background in Raman spectrum preferably, has very strong feasibility and practicality.
Accompanying drawing explanation
Fig. 1 is the present invention device schematic diagram reducing gas Raman spectrum fluorescence background based on polarization characteristic；
Fig. 2 is that the present invention is based on a kind of embodiment of gas sample cell in the device reducing gas Raman spectrum fluorescence background of polarization characteristic；
Fig. 3 is that the present invention is based on a kind of embodiment of light beam coupling collection device in the device reducing gas Raman spectrum fluorescence background of polarization characteristic；
Fig. 4 is that the present invention is based on a kind of embodiment of polarization modulating arrangement in the device reducing gas Raman spectrum fluorescence background of polarization characteristic.
Fig. 5 is that the present invention is based on the another kind of embodiment of polarization modulating arrangement in the device reducing gas Raman spectrum fluorescence background of polarization characteristic.
Fig. 6 is that the present invention is based on a kind of embodiment of opto-electronic receiver conversion equipment in the device reducing gas Raman spectrum fluorescence background of polarization characteristic.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
The present invention is based on above-mentioned principle design, the device reducing gas Raman spectrum fluorescence background provided is as it is shown in figure 1, mainly include laser instrument 1, gas sample chamber 2, light beam coupling collection device 3, light beam polarization modulating device 4, opto-electronic receiver conversion equipment 5, signal generator 6, lock-in amplifier 7 and signal output device 8.In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein is used only for explaining the present invention, be not intended to limit the present invention.
The sample cell embodiment adopted in this device is as in figure 2 it is shown, be mainly made up of the silver-plated capillary tube 9 of the inwall that length is 250 millimeters, and in capillary tube, hollow diameter is 320 microns, and tube wall overall diameter is 450 microns.Capillary tube two ends are through fixing device 10, and are fixed by hollow nut and graphite gasket.
Light beam coupling collection device 3 embodiment adopted in this device is as it is shown on figure 3, be made up of the lens 11 (focal length is 60mm), beam splitter 12 and the optical filter 13 that are positioned on same optical axis.Beam splitter 12 and lens 11 together constitute the excitation beam coupling unit of device, for being coupled in the interior hollow of capillary tube by the laser beam that laser instrument 1 sends.Lens 11 and optical filter 13 constitute the scattering light collection part of device, for collecting and collimate the backward Raman scattering light coming from capillary tube end face, and propagate after filtering Rayleigh scattering light to polarization modulating arrangement 4, scattering light is made to pass through polarization modulating arrangement with the form of collimated light beam as much as possible, obtain higher polarization beam splitting efficiency, thus improving the quality of modulation.
A kind of embodiment of the polarization modulating arrangement 4 adopted in this device as shown in Figure 4, is made up of fixture 14, the automatically controlled turntable of hollow 15 (central openings, the adjustable motor of rotating speed 0.1 100 cycle per second or driven by servomotor) and polarization beam splitter prism 16 (being of a size of the polarization beam splitting block prism of 1 inch).Incident mixed polarized light beam can be divided into two bundles by polarization beam splitter prism, and a branch of continuation along the former direction of propagation is propagated, and the direction that another bundle is reflected along being perpendicular to optical axis is propagated, and the heat sink dissipation of absorption being finally in the layout of surrounding.Being p polarisation through light beam, electric field orientation of oscillation is parallel to the plane of incidence of prism beam splitting place；Reflection light beam is s polarisation, and electric field orientation of oscillation is perpendicular to the plane of incidence of prism beam splitting place.P polarisation transmitance is more than 90%, and s polarisation reflectance, more than 99.5%, keeps the wave-length coverage of this transmitance and reflectivity Characteristics to reach hundreds of nanometers, and the scattering light of applicable full Raman shift range is analyzed.The signal control automatically controlled turntable of hollow 15 coming from signal generator 6 rotates along optical axis with specific angular velocity omega, thus driving polarization beam splitter prism also to rotate along optical axis, and then reach to carry out Polarization Modulation with modulating frequency f to coming from the scattering light that light beam coupling collection device collects, make the script that opto-electronic receiver conversion equipment receives have the cyclically-varying of intensity frequency of occurrences f of the Raman scattering signal determining polarization characteristic.
The another kind of embodiment of the polarization modulating arrangement 4 adopted in this device is as it is shown in figure 5, be made up of liquid crystal optics shutter 17 and its controller 18.Liquid crystal wave plate and polarizer are combined by liquid crystal optics shutter (ThorlabsLCC1620), the periodically-varied polarization gating direction by light beam can be come by signal generator 6 periodically-varied liquid crystal shutter controller 18 voltage put on liquid crystal wave plate, reach the Polarization Modulation to incident beam.Owing to not having mechanical part inside liquid crystal optics shutter, therefore structure is relatively easy, stable, and easily obtains higher modulating frequency (can reach hundred hertz of magnitudes) under the control of signal generator 6.
Opto-electronic receiver conversion equipment 5 embodiment adopted in this device as shown in Figure 6, is be made up of imaging lens 19 (Nikkor50mm, F/1.8), monochromator 20 and highly sensitive unit light electric explorer 21.Collimated beam after polarization modulating arrangement 4 is collected by imaging lens 19 and is coupled in monochromator 20, and is finally converted in corresponding signal of telecommunication feeding lock-in amplifier 7 by unit light electric explorer 21.
Below in conjunction with Fig. 1, Fig. 2 and Fig. 3, the present invention groundwork flow process based on Polarization Modulation Raman scattering device is described.
The laser beam of linear polarization characteristic that what laser instrument 1 sent have, after beam splitter 12 reflects, is focused on by lens 11 in the inner core being coupled into capillary tube 9 and gaseous sample therein interacts and excites spontaneous Raman scattering.The backward Raman scattering light produced is collected and is propagated to end face by capillary tube 9, lens 11 collect after collimation filters Rayleigh scattering with optical filter 13 and enter in polarization modulating arrangement 4.Signal generator 6 controls polarization modulating arrangement 4, with modulating frequency f, mixing scattering light is carried out Polarization Modulation, and modulation frequency signal is connected to lock-in amplifier 7 as reference signal by it.Collimation scattering light after Polarization Modulation is collected by imaging lens 19 and is coupled in monochromator 20, eventually arrive on single-element detector 21, and Raman diffused light power therein can with modulating frequency mechanical periodicity, and the power of the fluorescence signal being collected into substantially not with modulating frequency change.Therefore, utilize the reference signal that lock-in amplifier 7 combination are sent into by signal generator 6 can be extracted from continuous background by the Raman signal collected and be eventually displayed on signal output device 8, thus eliminating the impact that continuous background is brought, improve the system power of test to faint composition.
Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (5)
1. the device reducing gas Raman spectrum fluorescence background, it is characterized in that, described device includes: laser instrument, gas sample cell, light beam coupling collection device, polarization modulating arrangement, opto-electronic receiver conversion equipment, signal generator, lock-in amplifier and signal output device；
The laser coupled that described laser instrument sends is entered described gas sample cell by described light beam coupling collection device；Simultaneously by collecting and collimating the mixed polarized light coming from described gas sample cell, propagate to polarization modulating arrangement；
Described mixed polarized light is carried out Polarization Modulation and is classified as two parts by described polarization modulating arrangement, and a part keeps the former direction of propagation to continue along optical axis, and another part is dissipated or is perpendicular to optical axis after reflection；
Collimated beam after Polarization Modulation is converted to the corresponding signal of telecommunication and sends in described lock-in amplifier by described opto-electronic receiver conversion equipment；
Described signal generator controls described polarization modulating arrangement and with modulating frequency f described mixed polarized light carries out Polarization Modulation, and modulation frequency signal is connected to described lock-in amplifier as reference signal by it；
Described signal output device utilizes the reference signal that described lock-in amplifier combination are sent into by described signal generator can be extracted from continuous background by the Raman signal collected and finally show.
2. device as claimed in claim 1, it is characterised in that described polarization modulating arrangement includes the automatically controlled turntable of hollow and polarization beam splitter prism；Mixed polarized light is divided into two bundles by described polarization beam splitter prism, and the former direction of propagation of a branch of maintenance is continued along optical axis, and another bundle is perpendicular to optical axis after reflection；Under the drive of the automatically controlled turntable of described hollow, polarization beam splitter prism rotates along optical axis, can realize the Polarization Modulation to incident collimated light beams.
3. device as claimed in claim 1, it is characterised in that described polarization modulating arrangement includes liquid crystal optics shutter and its controller；Liquid crystal shutter controller described in described signal generator periodically-varied puts on the voltage on liquid crystal wave plate and comes the periodically-varied polarization gating direction by light beam, reaches the Polarization Modulation to incident beam.
4. device as claimed in claim 1, it is characterised in that described opto-electronic receiver conversion equipment includes bigbore imaging lens, monochromator and high sensitivity unit light electric explorer；Collimated beam after Polarization Modulation is directly collected by imaging lens and is coupled in monochromator, and cooperation high sensitivity unit light electric explorer can quick detection small-signal.
5. the method reducing gas Raman spectrum fluorescence background, it is characterised in that said method comprising the steps of:
(1) utilize described light beam coupling collection device that the laser coupled that described laser instrument sends is entered described gas sample cell；Utilize described light beam coupling collection device to collect simultaneously and collimation is from the backward Raman scattering light of described gas sample cell, propagate to described polarization modulating arrangement after filtration；
(2) control described polarization modulating arrangement by described signal generator, with modulating frequency f, described mixed polarized light is carried out Polarization Modulation；
(3) utilize described opto-electronic receiver conversion equipment that the collimated beam after Polarization Modulation is converted to the corresponding signal of telecommunication to send in described lock-in amplifier；
(4) reference signal that described lock-in amplifier combination are sent into by described signal generator is utilized can be extracted from continuous background by the Raman signal collected and be eventually displayed on described signal output device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610128583.5A CN105784643B (en) | 2016-03-07 | 2016-03-07 | A kind of devices and methods therefor reducing gas Raman spectrum fluorescence background |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610128583.5A CN105784643B (en) | 2016-03-07 | 2016-03-07 | A kind of devices and methods therefor reducing gas Raman spectrum fluorescence background |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105784643A true CN105784643A (en) | 2016-07-20 |
| CN105784643B CN105784643B (en) | 2019-03-05 |
Family
ID=56387112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610128583.5A Active CN105784643B (en) | 2016-03-07 | 2016-03-07 | A kind of devices and methods therefor reducing gas Raman spectrum fluorescence background |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105784643B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844631A (en) * | 2018-04-16 | 2018-11-20 | 西北核技术研究所 | A kind of device and method for eliminating Raman scattering background interference |
| CN109632760A (en) * | 2018-12-06 | 2019-04-16 | 深圳网联光仪科技有限公司 | A method of excluding fluorescence interference measurement substance Raman spectrum |
| CN110208240A (en) * | 2019-04-08 | 2019-09-06 | 大连理工大学 | Terahertz Raman spectrum detecting device based on time-domain frequency domain compacting stray light |
| CN111208066A (en) * | 2018-11-22 | 2020-05-29 | 清华大学 | Biological detection device and method |
| CN112764165A (en) * | 2021-01-12 | 2021-05-07 | 北京凯普林光电科技股份有限公司 | Adjustable optical fiber polarization collimating lens |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619528A (en) * | 1984-01-26 | 1986-10-28 | Exxon Research And Engineering Co. | Phase resolved modulation Raman spectrometer |
| JP2000241349A (en) * | 1999-02-23 | 2000-09-08 | Bunshi Biophotonics Kenkyusho:Kk | Polarization property measuring apparatus |
| CN1535539A (en) * | 2001-06-02 | 2004-10-06 | �ʼҷ����ֵ��ӹɷ�����˾ | Digital image projector with oriented fixed-polarization-axis polarizing beamsplitter |
| CN101052868A (en) * | 2004-06-30 | 2007-10-10 | 斯埃诺公司 | Systems and methods for chiroptical heterodyning |
| CN101776605A (en) * | 2010-01-28 | 2010-07-14 | 天津大学 | Simple coordinate regulation device for regulating polarization direction of Micro-Raman spectrum system |
| CN102680451A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | System for removing Raman spectral scattering background noise |
| CN102998296A (en) * | 2012-11-28 | 2013-03-27 | 重庆绿色智能技术研究院 | Raman spectra pretreatment method for removing effects of background noises |
| CN103091299A (en) * | 2013-01-21 | 2013-05-08 | 北京理工大学 | Laser differential confocal map microimaging imaging method and device |
| CN103344569A (en) * | 2013-06-21 | 2013-10-09 | 中国科学院上海光学精密机械研究所 | Optical coherence tomography method and optical coherence tomography system for complex polarization frequency domain |
| CN104568150A (en) * | 2013-10-15 | 2015-04-29 | 南京理工大学 | Micro-polarization array based interference imaging full-polarization spectrum detection device and method |
| CN104677880A (en) * | 2015-03-25 | 2015-06-03 | 武汉四方光电科技有限公司 | Laser Raman gas analysis system and real-time differential background noise removal measurement method |
| CN104965309A (en) * | 2015-07-27 | 2015-10-07 | 西安交通大学 | Beam splitter, achieving any polarization state output, with beam splitting ratio being continuously adjustable |
| CN105067114A (en) * | 2015-07-17 | 2015-11-18 | 苏州大学 | Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence |
-
2016
- 2016-03-07 CN CN201610128583.5A patent/CN105784643B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619528A (en) * | 1984-01-26 | 1986-10-28 | Exxon Research And Engineering Co. | Phase resolved modulation Raman spectrometer |
| JP2000241349A (en) * | 1999-02-23 | 2000-09-08 | Bunshi Biophotonics Kenkyusho:Kk | Polarization property measuring apparatus |
| CN1535539A (en) * | 2001-06-02 | 2004-10-06 | �ʼҷ����ֵ��ӹɷ�����˾ | Digital image projector with oriented fixed-polarization-axis polarizing beamsplitter |
| CN101052868A (en) * | 2004-06-30 | 2007-10-10 | 斯埃诺公司 | Systems and methods for chiroptical heterodyning |
| CN101776605A (en) * | 2010-01-28 | 2010-07-14 | 天津大学 | Simple coordinate regulation device for regulating polarization direction of Micro-Raman spectrum system |
| CN102680451A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | System for removing Raman spectral scattering background noise |
| CN102998296A (en) * | 2012-11-28 | 2013-03-27 | 重庆绿色智能技术研究院 | Raman spectra pretreatment method for removing effects of background noises |
| CN103091299A (en) * | 2013-01-21 | 2013-05-08 | 北京理工大学 | Laser differential confocal map microimaging imaging method and device |
| CN103344569A (en) * | 2013-06-21 | 2013-10-09 | 中国科学院上海光学精密机械研究所 | Optical coherence tomography method and optical coherence tomography system for complex polarization frequency domain |
| CN104568150A (en) * | 2013-10-15 | 2015-04-29 | 南京理工大学 | Micro-polarization array based interference imaging full-polarization spectrum detection device and method |
| CN104677880A (en) * | 2015-03-25 | 2015-06-03 | 武汉四方光电科技有限公司 | Laser Raman gas analysis system and real-time differential background noise removal measurement method |
| CN105067114A (en) * | 2015-07-17 | 2015-11-18 | 苏州大学 | Multi-wavelength external cavity laser emitter used for inhibiting Raman spectrometer fluorescence |
| CN104965309A (en) * | 2015-07-27 | 2015-10-07 | 西安交通大学 | Beam splitter, achieving any polarization state output, with beam splitting ratio being continuously adjustable |
Non-Patent Citations (2)
| Title |
|---|
| C.A.ARGUELLO ET AL.: "Simple Technique to Suppress Spurious Luminescence in Raman Spectroscopy", 《APPLIED OPTICS》 * |
| 邹文龙 等: "拉曼光谱测量中的荧光抑制方法综述", 《光学仪器》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844631A (en) * | 2018-04-16 | 2018-11-20 | 西北核技术研究所 | A kind of device and method for eliminating Raman scattering background interference |
| CN111208066A (en) * | 2018-11-22 | 2020-05-29 | 清华大学 | Biological detection device and method |
| CN111208066B (en) * | 2018-11-22 | 2021-07-30 | 清华大学 | Biological detection device and method |
| CN109632760A (en) * | 2018-12-06 | 2019-04-16 | 深圳网联光仪科技有限公司 | A method of excluding fluorescence interference measurement substance Raman spectrum |
| CN110208240A (en) * | 2019-04-08 | 2019-09-06 | 大连理工大学 | Terahertz Raman spectrum detecting device based on time-domain frequency domain compacting stray light |
| CN112764165A (en) * | 2021-01-12 | 2021-05-07 | 北京凯普林光电科技股份有限公司 | Adjustable optical fiber polarization collimating lens |
| CN112764165B (en) * | 2021-01-12 | 2023-04-11 | 北京凯普林光电科技股份有限公司 | Adjustable optical fiber polarization collimating lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105784643B (en) | 2019-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105784643A (en) | Device and method for reducing fluorescent background of gas Raman spectrum | |
| CN104237135B (en) | CO gas detecting systems and method based on quartz tuning fork strengthened optoacoustic spectroscopy | |
| Zhang et al. | Femtosecond broadband fluorescence upconversion spectroscopy: Improved setup and photometric correction | |
| US4728190A (en) | Device and method for optically detecting particles in a fluid | |
| US20180038798A1 (en) | Portable raman device | |
| CN106053428B (en) | A kind of petrochemical industry based on the enhancing of F-P optical signallings carries the sensing device of hydrogen pipeline gas content on-line measurement | |
| CN104568897B (en) | Raman spectrum intensifier, system and method based on chamber exterior resonant cavity technology | |
| CN109030451B (en) | Ultrashort pulse time overlapping degree measuring device and method in CARS microscopic imaging system | |
| CN104280671B (en) | Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis | |
| CN214472779U (en) | For detecting SF6Enhanced Raman spectrum detection system for decomposed gas | |
| JP2009204613A (en) | Apparatus and method for obtaining image using coherent anti-stokes raman scattering | |
| CN102680451A (en) | System for removing Raman spectral scattering background noise | |
| CN105675581B (en) | A kind of free space gas Raman scattering collection device | |
| CN113552212B (en) | Radial cavity quartz enhanced photoacoustic spectrum sound detector and gas detection device thereof | |
| CN106680260B (en) | A kind of portable coherent antistockes Raman spectroscopy instrument | |
| CN107167457A (en) | The confocal CARS micro-spectrometers method and device of transmission-type | |
| CN110031426A (en) | A kind of the escaping of ammonia analyzer and analysis method based on multi beam light source off-axis integrated chamber output spectrum technology | |
| CN113804671A (en) | High-sensitivity Raman spectrum detection system | |
| US7929131B2 (en) | Highly compact design for raman spectrometry | |
| CN102419250A (en) | Active polymer plane waveguide propagation constant measuring instrument based on fluorescence imaging | |
| CN202403893U (en) | Active polymer planar waveguide propagation constant measuring instrument based on fluorescence imaging | |
| CN110567934A (en) | Raman test auxiliary adjustment coupling real-time imaging system and testing method based on micro-structure optical fiber | |
| CN213275352U (en) | Raman signal collecting probe based on off-axis parabolic reflector | |
| CN108534896A (en) | Femtosecond time resolution pumps and the two-in-one spectrometer system of broadband time-resolved CARS | |
| CN205449805U (en) | Surface reinforcing raman spectroscopy test system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Co-patentee after: Sifang Optoelectronic Co., Ltd. Patentee after: Huazhong University of Science and Technology Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Co-patentee before: Wuhan Cubic Optoelectronics Co., Ltd. Patentee before: Huazhong University of Science and Technology |
|
| CP01 | Change in the name or title of a patent holder |