CN107976426A - A kind of constituent of atomsphere detection system based on chevilled silk laser - Google Patents
A kind of constituent of atomsphere detection system based on chevilled silk laser Download PDFInfo
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- CN107976426A CN107976426A CN201711060057.0A CN201711060057A CN107976426A CN 107976426 A CN107976426 A CN 107976426A CN 201711060057 A CN201711060057 A CN 201711060057A CN 107976426 A CN107976426 A CN 107976426A
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- laser
- chevilled silk
- atomsphere
- constituent
- chevilled
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- 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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
Abstract
A kind of constituent of atomsphere detection system based on chevilled silk laser, is made of femto-second laser, chevilled silk regulation device, spectrally resolved device and pollutant analysis device.Femto-second laser launches ultrafast laser, by the regulation and control of chevilled silk regulation device, chevilled silk laser is sent to air, chevilled silk laser and matter interaction in air, produce the fluorescence signal containing measured matter characteristic information, collected by spectrally resolved device, the classification and content of the atmospheric elements in search coverage are judged via pollutant analysis device.The present invention utilizes the fluorescence Spectra of the various atmosphere pollutions of chevilled silk laser excitation of high intensity, a wide range of, vertical continuous, real-time monitoring are carried out so as to fulfill to constituent of atomsphere, while the problem in terms of identifying unknown pollutant and detecting the chemical composition of the various pollutants with complicated form can be solved.
Description
Technical field
It is more particularly to a kind of based on a wide range of, high-precision of chevilled silk laser the present invention relates to space-based atmosphere environment supervision field
Degree, the detection method of multi-component atmosphere pollution.
Background technology
Traditional spaceborne air monitoring device relies on light spectrum image-forming and laser radar technique.Device is broadly divided into two
Class.It is a kind of that specific wavelength absorptivity is measured by laser radar technique, monitor with CO2Based on greenhouse gases.Laser radar can
Remotely to measure absorption spectra, so as to fulfill atmosphere pollution composition detection.Since every kind of gas only absorbs specific wavelength laser, if
, it is necessary to carry multiple laser radar load when measuring multicomponent gas, when target atmosphere pollution is more, the technical solution is real
Apply with unsurmountable limitation.Moreover, when monitoring burst security incident discharges atmosphere pollution, due to pollutant not
Must be load goal-selling monitoring object, the laser radar technique based on absorption spectrometry is with regard to helpless.
Another kind of technology be then by it is spectrally resolved or polarization differentiate light spectrum image-forming result inverting aerosol based on it is thin
The atmosphere pollution information such as geographical distribution, concentration and the average particulate diameter of particulate matter (haze).Such technology can only monitor haze
Physical characteristic, and pollutant chemistry component information cannot be detected.
Traditional detection device can not realize the real-time monitoring to air multicomponent pollutant, the unknown pollutant of None- identified
With the chemical composition for detecting the various pollutants with complicated form, it is difficult to realize for the accurate of the air pollution component such as haze
Monitor and find what the accidents such as volcano eruption, geological disaster, war or fire directly or indirectly produced in first time
Various Complex form pollutant and the poisonous and harmful gaseous material of macromolecular.
The content of the invention
The technology of the present invention solves the problems, such as：
The shortcomings that overcoming the prior art, proposes a kind of constituent of atomsphere detection system based on chevilled silk laser, is swashed using ultrafast
The chevilled silk laser that light produces carries out a wide range of, vertical continuous, real-time monitoring to constituent of atomsphere.
The present invention technical solution be：
A kind of constituent of atomsphere detection system based on chevilled silk laser, including：Femto-second laser, chevilled silk regulation device, spectrum
Discriminating device and pollutant analysis device；
Femto-second laser, chevilled silk regulation device is imported for generating ultrafast laser, and by the ultrafast laser；
Chevilled silk regulation device, for based on the ultrafast laser, producing chevilled silk laser, and swash to chevilled silk described in atmospheric emission
Light so that chevilled silk laser and matter interaction in air, produce fluorescence signal；
Spectrally resolved device, spectrum analysis is carried out for collecting the fluorescence signal, and to the fluorescence signal；
Pollutant analysis device, for according to Spectroscopic analysis results, identifying gaseous species and concentration.
According to one embodiment of present invention, the femto-second laser includes femtosecond laser oscillator, femtosecond laser broadening
Device, femtosecond laser amplifier and femtosecond laser compressor reducer；
Femtosecond laser oscillator, for by green laser pumping, producing seed laser, and the seed laser is imported
Femtosecond laser stretcher；
Femtosecond laser stretcher, carries out the seed laser phase spread, and the seed laser of broadening is imported femtosecond
Laser amplifier；
Femtosecond laser amplifier, in the case of no more than optic element damage threshold value, the seed for amplifying the broadening swashs
The power of light；
Femtosecond laser compressor reducer, is compressed the seed laser of the broadening after amplifying power, generates ultrafast laser.
According to one embodiment of present invention, the chevilled silk regulation device includes burst length chirp regulation device, laser
Space phase regulation device and auxiliary laser pulse device；
Burst length chirp regulation device, pre-compensates for the propagation in atmosphere dispersion to ultrafast laser by grating, and
Increase pulse width, improve the peak power of ultrafast laser；
Laser space phase regulation device, the spatial light intensity for adjusting ultrafast laser are distributed, and produce the battle array of chevilled silk laser
Row, and extend the length of chevilled silk laser, improve the intensity and robustness of the fluorescence signal that chevilled silk laser produces；
Auxiliary laser pulse device, for by false impulse, improving the fluorescence signal intensity that chevilled silk laser produces.
According to one embodiment of present invention, the laser space phase regulation device includes reflective spatial light modulator
With binary optical phase-plate；
Reflective spatial light modulator, it is uniform to obtain for adjusting the Wave-front phase and radius of curvature of ultrafast laser
Converge hot spot；
Binary optical phase-plate, the array of chevilled silk laser is produced based on the uniform convergence hot spot, and by chevilled silk
The geometric properties of laser array are regulated and controled, and to extend the length of chevilled silk laser, improve the fluorescence signal that chevilled silk laser produces
Intensity and robustness.
According to one embodiment of present invention, the geometric properties include the chevilled silk laser number of chevilled silk laser array, divide
Spacing between cloth shape and chevilled silk laser.
According to one embodiment of present invention, the false impulse is nanosecond pulse.
According to one embodiment of present invention, the spectrally resolved device is included backwards to fluorescence collector, spectrometer and spy
Survey device；
Backwards to fluorescence collector, for collecting the fluorescence signal；
Detector, for capturing the fluorescence signal；
Spectrometer, for carrying out spectrum analysis to the fluorescence signal.
According to one embodiment of present invention, it is described backwards to fluorescence collector be speculum.
According to one embodiment of present invention, the industrial camera is electron multiplying charge coupling device or enhancing electric charge coupling
Attach together and put.
According to one embodiment of present invention, pollutant analysis device uses artificial neural network according to Spectroscopic analysis results
Network method identifies gaseous species and concentration.
The present invention compared with prior art the advantages of be：
(1), can be realized to a wide range of and vertical range continuous, real-time, quick of constituent of atomsphere using chevilled silk laser
Monitoring；
(2), can realize to unknown pollutant, harmful substance, and the various quick knowledges with complicated form atmospheric substance
Not and detect；
(3), the intensity and robustness of fluorescence signal can be improved, makes testing result accurately and reliably.
Brief description of the drawings
Fig. 1 is the schematic diagram of the constituent of atomsphere detection system according to an embodiment of the invention based on chevilled silk laser.
Fig. 2 is the schematic diagram of femto-second laser according to an embodiment of the invention.
Fig. 3 is the schematic diagram of chevilled silk regulation device according to an embodiment of the invention.
Fig. 4 is the schematic diagram of spectrally resolved device according to an embodiment of the invention.
Embodiment
In an embodiment of the present invention, propose a kind of constituent of atomsphere detection system based on chevilled silk laser, swashed using ultrafast
The chevilled silk laser that light produces carries out a wide range of, vertical continuous, real-time monitoring to constituent of atomsphere.
Chevilled silk laser has the laser intensity of superelevation, can make any molecule or atom that ionization or dissociation occur, by adopting
Molecule or atom after collection ionization or dissociation are launched in relaxation process to be composed with the fingerprint fluorescent corresponding to material chemical composition, no
It can only identify SO2、NO2With the so simple gaseous pollutants of CO, and it is gentle to detect big biochemical molecular, floating dust, metal
Colloidal sol etc. has the chemical composition of the source of atmospheric pollution of complicated chemical composition.It can solve current techniques and identify unknown pollutant
With the problem in terms of the chemical composition for detecting the various pollutants with complicated form.
Another advantage of chevilled silk atmospheric laser pollution monitoring technology is only with a laser and a set of optical telescope
As fluorescence reception system, it is possible to realize that polluting more components accurately remotely measures in an atmosphere.And without other
Optical instrument can significantly decrease the decay of floating dust and aerosol to laser power density in air, so as to weaken air rapids
The weather conditions such as stream are further ensured that the stability of fluorescence signal, significantly improve the accurate of detection for the adverse effect of measurement
Property.
Chevilled silk laser for the air pollutions such as haze monitoring and finding and distinguished because fire etc. is natural at the first time
The poison gas that toxic and harmful gas caused by disaster and the attack of terrorism etc. are spread by air and biochemical war agent of disabling, have nothing
Alternative effect.
As shown in Figure 1, the constituent of atomsphere detection system based on chevilled silk laser can be located on satellite, for big from high-altitude detection
Gas component, including femto-second laser, chevilled silk regulation device, spectrally resolved device and pollutant analysis device.
Femto-second laser generates ultrafast laser, and ultrafast laser is imported chevilled silk regulation device.Chevilled silk regulation device is based on
Ultrafast laser, produces chevilled silk laser, and to atmospheric emission chevilled silk laser so that chevilled silk laser and matter interaction in the big phase,
Produce the fluorescence signal containing measured matter characteristic information.Spectrally resolved device receives fluorescence signal, and fluorescence signal is carried out
Spectrum analysis.Pollutant analysis device identifies gaseous species and concentration according to Spectroscopic analysis results.
As shown in Fig. 2, femto-second laser includes femtosecond laser oscillator, femtosecond laser stretcher, femtosecond laser amplifier
With femtosecond laser compressor reducer.
Femtosecond laser oscillator produces seed laser, and seed laser is imported femtosecond laser by green laser pumping
Stretcher, in this example, femtosecond laser oscillator are kerr lens mode locking titanium precious stone laser oscillators.Femtosecond laser stretcher,
Phase spread is carried out to seed laser, and the seed laser of broadening is imported into femtosecond laser amplifier, in this example, femtosecond laser
Stretcher is Martinez type stretchers.Femtosecond laser amplifier, in the case of no more than optic element damage threshold value, to the greatest extent may be used
The power of the seed laser of the broadening can be amplified, in this example, femtosecond laser amplifier is regeneration prime amplifier.Femtosecond laser
Compressor reducer is compressed the seed laser of the broadening after amplifying power, generates ultrafast laser, in this example, femtosecond laser compression
Device is Treacy type laser discharge chambes.
As shown in figure 3, chevilled silk regulation device include burst length chirp regulation device, laser space phase regulation device and
Auxiliary laser pulse device.
Burst length chirp regulation device pre-compensates for the propagation in atmosphere dispersion to ultrafast laser by grating, and increases
Big pulse width, improves the peak power of ultrafast laser.Laser space phase regulation device, for adjusting the space of ultrafast laser
Light distribution, produces the array of chevilled silk laser, and extends the length of chevilled silk laser, improves the fluorescence signal that chevilled silk laser produces
Intensity and robustness, wherein, laser space phase regulation device includes reflective spatial light modulator and binary optical phase-plate,
Reflective spatial light modulator is used for the Wave-front phase for adjusting ultrafast laser and radius of curvature (that is, the spatial light intensity of laser point
Cloth), to obtain uniform convergence hot spot, binary optical phase-plate produces the battle array of chevilled silk laser based on the uniform convergence hot spot
Row, and (chevilled silk laser number, distribution shape and the chevilled silk of chevilled silk laser array swash by the geometric properties to chevilled silk laser array
Spacing between light) regulated and controled, to extend the length of chevilled silk laser, improve the fluorescence signal that chevilled silk laser produces intensity and
Robustness.Auxiliary laser pulse device is used to pass through false impulse, the fluorescence signal intensity that chevilled silk laser produces is improved, in example
In, false impulse is nanosecond pulse, can realize that chevilled silk laser produces fluorescence Spectra nonlinear kinetics by accelerating molecular thermalmotion
The microcosmic regulation and control of process, effectively improve fluorescence spectral intensity, optimize the signal-to-noise ratio based on the more component detections of chevilled silk atmosphere pollution.
As shown in figure 4, spectrally resolved device is included backwards to fluorescence collector, spectrometer and detector.
It is used to collect the fluorescence signal containing measured matter characteristic information backwards to fluorescence collector, in this example, backwards to glimmering
Light collector is the deployable speculum of aperture lightweight, can plus signal collect effective area, bring up to the flashlight up to detector
Flux, uses ultrafast fast gate technique in the deployable speculum of aperture lightweight, allows fluorescence signal to lead in extremely short time window
Arrival detector is crossed, can effectively reduce influence of noise, improves the sensitivity of spectrally resolved device.Detector is used to capture backwards to glimmering
The fluorescence signal that light collector is collected, in this example, detector are electron multiplying charge coupling device (EMCCD) or enhancing electric charge
Coupling device (ICCD).Spectrometer, for carrying out spectrum analysis to fluorescence signal.
Pollutant analysis device is used for according to Spectroscopic analysis results, and gaseous species are identified using Artificial Neural Network
And concentration.
Embodiment
Using the constituent of atomsphere detection system proposed by the present invention based on chevilled silk laser, existed by gathering the molecule after dissociating
Transmitting is composed with the fingerprint fluorescent corresponding to material chemical composition in relaxation process, realizes the detection to local atmosphere pollution,
Mainly include freon, protein solid powder, heavy metal particles (chromium) and salt water aerosol, detection accuracy and reach 1ppm.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (10)
- A kind of 1. constituent of atomsphere detection system based on chevilled silk laser, it is characterised in that including：Femto-second laser, chevilled silk regulation and control Device, spectrally resolved device and pollutant analysis device；Femto-second laser, chevilled silk regulation device is imported for generating ultrafast laser, and by the ultrafast laser；Chevilled silk regulation device, for based on the ultrafast laser, producing chevilled silk laser, and to chevilled silk laser described in atmospheric emission, So that chevilled silk laser and matter interaction in air, produce fluorescence signal；Spectrally resolved device, spectrum analysis is carried out for collecting the fluorescence signal, and to the fluorescence signal；Pollutant analysis device, for according to Spectroscopic analysis results, identifying gaseous species and concentration.
- 2. the constituent of atomsphere detection system according to claim 1 based on chevilled silk laser, it is characterised in that the femtosecond swashs Light device includes femtosecond laser oscillator, femtosecond laser stretcher, femtosecond laser amplifier and femtosecond laser compressor reducer；Femtosecond laser oscillator, for by green laser pumping, producing seed laser, and the seed laser is imported femtosecond Laser stretcher；Femtosecond laser stretcher, carries out the seed laser phase spread, and the seed laser of broadening is imported femtosecond laser Amplifier；Femtosecond laser amplifier, in the case of no more than optic element damage threshold value, amplifies the seed laser of the broadening Power；Femtosecond laser compressor reducer, is compressed the seed laser of the broadening after amplifying power, generates ultrafast laser.
- 3. the constituent of atomsphere detection system according to claim 1 based on chevilled silk laser, it is characterised in that the chevilled silk tune Control device includes burst length chirp regulation device, laser space phase regulation device and auxiliary laser pulse device；Burst length chirp regulation device, pre-compensates for the propagation in atmosphere dispersion to ultrafast laser by grating, and increases Pulse width, improves the peak power of ultrafast laser；Laser space phase regulation device, the spatial light intensity for adjusting ultrafast laser are distributed, and produce the array of chevilled silk laser, and Extend the length of chevilled silk laser, improve the intensity and robustness of the fluorescence signal that chevilled silk laser produces；Auxiliary laser pulse device, for by false impulse, improving the fluorescence signal intensity that chevilled silk laser produces.
- 4. the constituent of atomsphere detection system according to claim 3 based on chevilled silk laser, it is characterised in that the laser is empty Between phase regulation device include reflective spatial light modulator and binary optical phase-plate；Reflective spatial light modulator, for adjusting the Wave-front phase and radius of curvature of ultrafast laser, to obtain uniform convergence Hot spot；Binary optical phase-plate, the array of chevilled silk laser is produced based on the uniform convergence hot spot, and by chevilled silk laser The geometric properties of array are regulated and controled, and to extend the length of chevilled silk laser, improve the intensity for the fluorescence signal that chevilled silk laser produces And robustness.
- 5. the constituent of atomsphere detection system according to claim 4 based on chevilled silk laser, it is characterised in that the geometry is special Sign includes the spacing between chevilled silk laser number, distribution shape and the chevilled silk laser of chevilled silk laser array.
- 6. the constituent of atomsphere detection system according to claim 3 based on chevilled silk laser, it is characterised in that the auxiliary arteries and veins Punching is nanosecond pulse.
- 7. the constituent of atomsphere detection system according to claim 1 based on chevilled silk laser, it is characterised in that the spectrum point Distinguish that device is included backwards to fluorescence collector, spectrometer and detector；Backwards to fluorescence collector, for collecting the fluorescence signal；Detector, for capturing the fluorescence signal；Spectrometer, for carrying out spectrum analysis to the fluorescence signal.
- 8. the constituent of atomsphere detection system according to claim 7 based on chevilled silk laser, it is characterised in that described backwards to glimmering Light collector is speculum.
- 9. the constituent of atomsphere detection system according to claim 7 based on chevilled silk laser, it is characterised in that the detector It is electron multiplying charge coupling device or enhancing charge coupled device.
- 10. the constituent of atomsphere detection system according to claim 1 based on chevilled silk laser, it is characterised in that pollutant point Analysis apparatus identifies gaseous species and concentration according to Spectroscopic analysis results using Artificial Neural Network.
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