CN104880418B - Spectral detection system - Google Patents
Spectral detection system Download PDFInfo
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- CN104880418B CN104880418B CN201510288565.9A CN201510288565A CN104880418B CN 104880418 B CN104880418 B CN 104880418B CN 201510288565 A CN201510288565 A CN 201510288565A CN 104880418 B CN104880418 B CN 104880418B
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Abstract
The invention discloses a kind of spectral detection system, belongs to spectral detection field.The system includes：Pulse laser, for producing the laser pulse that at least two beams intersect at a point；At least two light polarizers, correspond setting with laser pulse and each light polarizer is arranged in the light path of corresponding laser pulse；Sample stage, it is arranged on the intersection of at least two beam laser pulses；Beam splitter, it is arranged in the light path of flashlight and flashlight is divided into two bundle subsignal lights, flashlight is at least two beam laser pulses while is radiated at the non linear optical signal inspired on sample；Two groups of detection devices, it is separately positioned in the light path for two bundle subsignal lights that beam splitter separates, including for controlling the optical element of the polarization of subsignal light, the monochromator of optical signal for isolating specific wavelength from subsignal light and detector for converting optical signals into electric signal；Processing unit, the electric signal for being exported according to two detectors generate two width spectrum.
Description
Technical field
The present invention relates to spectral detection field, more particularly to a kind of spectral detection system.
Background technology
Nonlinear optical spectral technology is by by pulse lasers more than two beams or two beams while exposing to sample, so as to obtain
The technology of sample molecule structure and performance characteristic.
In traditional non-linear spectral experiment, after one group of nonlinear optical modal data of acquisition, it will usually change pulse and swash
Light polarization changes another group of nonlinear optical modal data of sample direction acquisition, to reach by changing experiment condition, obtains more
Molecular structure information purpose.But because spectral signal can be by experiment humiture fluctuation, sample degree of volatility, reaction time
Deng the influence of various factors, experiment condition and sample state might not corresponding to the non-linear spectral obtained in different experiments
It is identical, the accuracy of detection is so greatly lowered, and carry out experiment twice and cause the efficiency of spectral detection also very low.
The content of the invention
In order to solve problem of the prior art, the embodiments of the invention provide a kind of spectral detection system.The technical side
Case is as follows：
The embodiments of the invention provide a kind of spectral detection system, the system includes：
Pulse laser, for producing the laser pulse that at least two beam wavelength are different and intersect at a point；
At least two light polarizers, it is arranged on the setting of laser pulse one-to-one corresponding and each light polarizer corresponding
In the light path of the laser pulse；
Sample stage, for carrying sample and being arranged on the intersection of at least laser pulse described in two beams；
Beam splitter, it is arranged in the light path of flashlight and the flashlight is divided into two bundle subsignal lights, the flashlight
The non linear optical signal inspired on to the sample is irradiated simultaneously at least two beam laser pulses；
Two groups of detection devices, it is separately positioned in the light path for two bundle subsignal lights that the beam splitter separates, including for
Control the optical element of the polarization of the subsignal light, optical signal for isolating specific wavelength from the subsignal light
Monochromator and the detector for the optical signal to be converted into electric signal, the optical element, the monochromator and described
Detector is successively set in the light path for the subsignal light that the beam splitter separates；
Processing unit, the electric signal for being exported according to two detectors generates Peace Park, difference frequency vibrates
Spectrum or four-wave mixing vibrational spectrum, and every kind of spectrum includes tetra- kinds of polarization combination modes of SPP, PPP, SPS, PSS, wherein the
One letter represents that flashlight polarization, second letter represent that wherein beam of laser pulse polarization, the 3rd letter represent another
Beam laser pulse polarizes.
In a kind of implementation of the embodiment of the present invention, the beam splitter be dichroic beam splitters, polarization beam apparatus or
Pellicular beamsplitters.
In another implementation of the embodiment of the present invention, the detector is photomultiplier or charge coupled cell
Imaging sensor.
In another implementation of the embodiment of the present invention, the optical element includes being used to turn the subsignal light
Be changed to linearly polarized light Glan prism, the Glan prism is arranged in the light path of the subsignal light.
In another implementation of the embodiment of the present invention, the optical element also includes being used to change the subsignal
The half-wave plate of the polarization angle of light, the half-wave plate are arranged in the light path of the subsignal light.
In another implementation of the embodiment of the present invention, it is described detection device also include be arranged on the half-wave plate and
Optical filter between the monochromator.
In another implementation of the embodiment of the present invention, it is described detection device also include be arranged on the half-wave plate and
Condenser lens between the monochromator.
In another implementation of the embodiment of the present invention, the pulse laser, it is specifically used for：
Produce the intersecting laser pulse of two beams, the beam of laser pulse in two beam laser pulses is visible laser pulse, institute
It is infrared laser pulses or visible laser pulse to state another beam laser pulse in two beam laser pulses.
In another implementation of the embodiment of the present invention, the wave-length coverage of the visible laser pulse is in 400-1064
Nanometer, the wave-length coverage of the infrared laser pulses is in 2300-16000 nanometers.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
It is irradiated to simultaneously on sample by least two beam laser pulses, laser pulse is simultaneously with the electron energy level of molecule and shaking
Kinetic energy level carries out resonant excitation, produces flashlight；Flashlight is handled by beam splitter and produces two-way subsignal light, per way signal
Light carries out processing acquisition electric signal by detecting device respectively, and by two path signal input processing unit, processing unit is according to electricity
The width spectrum of signal generation two, so as to avoid the problem of being tested twice in the prior art, save experimental period, and by
Generated in two width spectrum under same experimental situation, be not in that individually sample caused by experiment changes or tested twice
The problem of condition changes, improves experimental precision and efficiency.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of structural representation of spectral detection system provided in an embodiment of the present invention；
Fig. 2 is the structural representation of another spectral detection system provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 provides a kind of structural representation of spectral detection system, and referring to Fig. 1, the system includes：
Pulse laser 101, for producing the laser pulse that at least two beam wavelength are different and intersect at a point；
At least two light polarizers 102, it is arranged on the setting of laser pulse one-to-one corresponding and each light polarizer corresponding
In the light path of laser pulse；
Sample stage 103, for carrying sample (solid or liquid) and being arranged on the intersection of at least two beam laser pulses；
Beam splitter 104, it is arranged in the light path of flashlight and flashlight is divided into two bundle subsignal lights, flashlight is at least
Two beam laser pulses are radiated at the non linear optical signal inspired on sample, the wavelength or polarization of two bundle subsignal lights simultaneously
Angle is different；
Two groups of detection devices, it is separately positioned in the light path for two bundle subsignal lights that beam splitter separates, including for controlling
The monochromator of the optical element 105 of the polarization of subsignal light, the optical signal for isolating specific wavelength from subsignal light
106 and for converting optical signals into the detector 107 of electric signal, optical element 105, monochromator 106 and detector 107
It is successively set in the light path for the subsignal light that beam splitter 104 separates；
Processing unit (not shown), the electric signal for being exported according to two detectors generate two width spectrum, and processing is single
Member electrically connects with two detectors 107 respectively.
Specifically, pulse laser 101 produces the laser pulse that at least two beam wavelength are different, when the laser arteries and veins of different wave length
When being irradiated on sample, laser pulse both can carry out resonant excitation with the electron energy level of molecule for punching, can be shaken again with molecule
Kinetic energy level carries out resonant excitation, so as to produce flashlight；Flashlight is handled by beam splitter and produces two-way subsignal light, per way
Flashlight carries out processing acquisition two path signal to optical signal by detecting device respectively, by two path signal input processing list
Member, processing unit generates two width spectrum according to electric signal, so as to avoid the problem of being tested twice in the prior art, saves
Experimental period, be not in that individually sample caused by experiment changes or the problem of experiment condition changes twice, improve reality
Test precision and efficiency.
Fig. 2 provides the structural representation of another spectral detection system, and pulse laser produces in the system that Fig. 2 is provided
Two beam laser pulses are (here only with two beam laser pulses as an example, wherein on the processing of flashlight and the tool of related device
The system that body description is equally applicable to Fig. 1 offers), referring specifically to Fig. 2, the system includes：
For producing the pulse laser 201 of the intersecting laser pulse of two beams, being disposed therein the light of beam of laser pulse
The first light polarizer 202 on road, the second light polarizer 203 being arranged in the light path of another beam laser pulse, it is arranged on two
The sample stage 204 of beam laser pulse intersection, it is arranged in the light path of flashlight and flashlight is divided into two bundle subsignal lights
Beam splitter 205 and two groups of detection devices being separately positioned in the light path for two bundle subsignal lights that beam splitter 205 separates, sample
It is provided with sample (solid or liquid) in sample platform 204, flashlight is that at least two beam laser pulses while be radiated on sample inspire
Non linear optical signal, the wavelength or polarization angle of two bundle subsignal lights are different.
Every group of detection device includes being used to subsignal light being converted to the Glan prism 206 of linearly polarized light, for changing son
The monochromator of the half-wave plate 207 of the polarization angle of flashlight, the optical signal for isolating specific wavelength from subsignal light
208th, for converting optical signals into the detector 209 of electric signal, Glan prism 206, half-wave plate 207, monochromator 208 and detection
Device 209 is successively set in the light path for the subsignal light that beam splitter 205 separates.
The processing unit that the electric signal that the system also includes being exported according to two detectors 209 generates two width spectrum (is schemed not
Show), processing unit electrically connects with two detectors 209 respectively.
Certainly, in above-mentioned spectral detection system, Glan prism 206 and half-wave plate 207 can also only set one of them.
In embodiments of the present invention, wherein beam of laser pulse is visible laser pulse, and another beam laser pulse is infrared
Laser pulse or visible laser pulse.Correspondingly, the first light polarizer 202 is visible polarizers, the second light polarizer 203
For infrared light polarizer or visible polarizers.The electron energy level of visible laser pulse and sample molecule carries out resonant excitation,
Infrared laser pulses and the vibration level of molecule carry out resonant excitation, while expose to sample with point so as to produce flashlight.
Specifically, according to the type of two beam laser pulses, wavelength, polarization mode, and the ripple of the optical signal finally obtained
Long and polarization mode, processing unit can obtain various forms of spectrum.Therefore, the Glan prism 206 in two groups of detection devices,
One or more of half-wave plate 207 and monochromator 208, can be by setting different parameters or using different installation shapes
Formula (such as angle), to control the wavelength for two optical signals for recently entering two detectors 209 and polarization mode different, so that processing
Unit can handle to obtain the different spectrum of two width.
More specifically, processing unit is used to be mixed according to electric signal generation Peace Park, difference frequency vibrational spectrum or four ripples
Frequency vibration spectrum, and every kind of spectrum polarization combination mode including SPP, PPP, SPS, PSS etc., wherein first letter represent letter
Number light polarization, second letter represent that wherein beam of laser pulse polarization, the 3rd letter represent another beam laser pulse polarization.
The first situation, wherein beam of laser pulse are visible laser pulse, and another beam laser pulse is infrared laser arteries and veins
Punching：
When the wavelength of flashlight meets following formula, then spectrum is Peace Park：
1/λSF=1/ λVis+1/λIR, wherein λSFFor signal light wavelength, λVisFor visible laser pulse wavelength, λIRSwash to be infrared
Light pulse wavelength；
When the wavelength of flashlight meets following formula, then spectrum is difference frequency vibrational spectrum：
1/λDF=1/ λVis-1/λIR, wherein λDFFor signal light wavelength, λVisFor visible laser pulse wavelength, λIRSwash to be infrared
Light pulse wavelength；
When the wavelength of flashlight meets following formula, then spectrum is four-wave mixing vibrational spectrum：
1/λFWM=1/ λVis+2/λIR, wherein λFWMFor signal light wavelength, λVisFor visible laser pulse wavelength, λIRTo be infrared
Laser pulse wavelength.
Second of situation, wherein beam of laser pulse are visible laser pulse, and another beam laser pulse is visible laser arteries and veins
Punching：
When the wavelength of flashlight meets following formula, then spectrum is Peace Park：
1/λSF=1/ λVis1+1/λVis2, wherein λSFFor signal light wavelength, λVis1For visible laser pulse wavelength, λVis2To be red
Outer laser pulse wavelength.
In embodiments of the present invention, at the same obtain two width spectrum both can be two distinct types of spectrum, such as and frequency
Vibrational spectrum and difference frequency vibrational spectrum；Can also be the different spectrum of two kinds of polarizations in same type of spectrum, such as and frequency vibration
SPP, PPP spectrum of dynamic spectrum.
Correspondingly, beam splitter 205 can be dichroic beam splitters, to separate the flashlight of different wave length.Beam splitter 205 can
Polarization beam apparatus or pellicular beamsplitters are thought, to separate the flashlight of different polarization angle.
Further, can also be by adjusting the first light polarizer 202 or the second light polarizer 203 in experimentation
Polarization angle change the spectrum of acquisition.
For example, when infrared laser pulses are P polarization, the polarization angle for controlling the first light polarizer 202 is 45 degree and -45
Degree, so as to obtain SSP, SPP Peace Park.
Further, the optical filter 210 that device can also include being arranged between half-wave plate 207 and monochromator 208 is detected,
Filtered out for the composition in sub-signal light.
Further, the condenser lens that device can also include being arranged between half-wave plate 207 and monochromator 208 is detected
211, for reducing the hot spot of subsignal light, so that subsignal light is input in monochromator 208.Certainly, there is optical filter 210
When, condenser lens 211 is located between optical filter 210 and monochromator 208.
It is readily apparent that, in the system shown in figure 1, optical filter and condenser lens, set-up mode and Fig. 2 phases can also be set
Together, no longer excessively repeat.
Specifically, it is seen that the wave-length coverage of laser pulse exists in 400-1064 nanometers, the wave-length coverage of infrared laser pulses
2300-16000 nanometers.
In embodiments of the present invention, detector 209 can be photomultiplier or charge coupling device charge coupled cell
Imaging sensor.
In embodiments of the present invention, processor calculates non-linear susceptibility, Fresnel factor etc. according to the spectrum fitted
Parameter, so that it is determined that the property of sample, is not repeated here.
Further, the direction of light path can also be changed by setting speculum in the embodiment of the present invention, so as to reach
Space-saving purpose.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (9)
1. a kind of spectral detection system, it is characterised in that the system includes：
Pulse laser, for producing the laser pulse that at least two beam wavelength are different and intersect at a point；
At least two light polarizers, it is arranged on the setting of laser pulse one-to-one corresponding and each light polarizer corresponding described
In the light path of laser pulse；
Sample stage, for carrying sample and being arranged on the intersection of at least laser pulse described in two beams；
Beam splitter, it is arranged in the light path of flashlight and the flashlight is divided into two bundle subsignal lights, the flashlight is institute
State at least two beam laser pulses while irradiate the non linear optical signal inspired on to the sample；
Two groups of detection devices, it is separately positioned in the light path for two bundle subsignal lights that the beam splitter separates, including for controlling
The monochrome of the optical element of the polarization of the subsignal light, optical signal for isolating specific wavelength from the subsignal light
Instrument and the detector for the optical signal to be converted into electric signal, the optical element, the monochromator and the detection
Device is successively set in the light path for the subsignal light that the beam splitter separates；
Processing unit, the electric signal for being exported according to two detectors generate Peace Park, difference frequency vibrational spectrum
Or four-wave mixing vibrational spectrum, and every kind of spectrum includes tetra- kinds of polarization combination modes of SPP, PPP, SPS, PSS, wherein first
Letter represents that flashlight polarization, second letter represent that wherein beam of laser pulse polarization, the 3rd letter represent another Shu Ji
Light pulse polarizes.
2. system according to claim 1, it is characterised in that the beam splitter is dichroic beam splitters, polarization beam apparatus
Or pellicular beamsplitters.
3. system according to claim 1, it is characterised in that the detector is photomultiplier or charge coupled cell
Imaging sensor.
4. system according to claim 1, it is characterised in that the optical element includes being used to turn the subsignal light
The Glan prism of linearly polarized light is changed to, the Glan prism is arranged in the light path of the subsignal light.
5. system according to claim 4, it is characterised in that the optical element also includes being used to change the subsignal
The half-wave plate of the polarization angle of light, the half-wave plate are arranged in the light path of the subsignal light.
6. system according to claim 5, it is characterised in that it is described detection device also include be arranged on the half-wave plate and
Optical filter between the monochromator.
7. system according to claim 5, it is characterised in that it is described detection device also include be arranged on the half-wave plate and
Condenser lens between the monochromator.
8. according to the system described in claim any one of 1-7, it is characterised in that the pulse laser, be specifically used for：
Producing the intersecting laser pulse of two beams, the beam of laser pulse in two beam laser pulses is visible laser pulse, described two
Another beam laser pulse in beam laser pulse is infrared laser pulses or visible laser pulse.
9. system according to claim 8, it is characterised in that the wave-length coverage of the visible laser pulse is in 400-1064
Nanometer, the wave-length coverage of the infrared laser pulses is in 2300-16000 nanometers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105445199A (en) * | 2015-12-10 | 2016-03-30 | 江汉大学 | Measuring apparatus for inversion number of atoms |
| CN105890633B (en) * | 2016-05-24 | 2017-12-08 | 郑州轻工业学院 | A kind of device for being used to measure the Brillouin scattering of sample to be tested under condition of high voltage |
| US10274310B2 (en) | 2016-12-22 | 2019-04-30 | The Boeing Company | Surface sensing systems and methods for imaging a scanned surface of a sample via sum-frequency vibrational spectroscopy |
| CN107589076A (en) * | 2017-10-30 | 2018-01-16 | 中国科学院合肥物质科学研究院 | Infrared polarization binary channels spectral measurement system |
| CN108627458A (en) * | 2018-04-02 | 2018-10-09 | 江苏科泰检测技术服务有限公司 | Spectral method of detection and system |
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