CN108318890A - A kind of aerosol detection radar system for making light source using white light LEDs - Google Patents
A kind of aerosol detection radar system for making light source using white light LEDs Download PDFInfo
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- CN108318890A CN108318890A CN201810008467.9A CN201810008467A CN108318890A CN 108318890 A CN108318890 A CN 108318890A CN 201810008467 A CN201810008467 A CN 201810008467A CN 108318890 A CN108318890 A CN 108318890A
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- Prior art keywords
- light source
- white light
- radar system
- signal receiving
- light leds
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
Abstract
The invention discloses a kind of aerosol detection radar systems for making light source using white light LEDs, including light source part, it further include the optical signal receiving portion for being located at same axis with light source part beam emitted, it is provided with speculum between light source part and optical signal receiving portion, speculum scatters after light source part beam emitted can be made to inject air to optical signal receiving portion, optical signal receiving portion is connected with light splitting detection part by optical fiber, light splitting detection part is connected with data acquisition module, and data acquisition module is connected with computer.The configuration of the present invention is simple, it is easy to use；The Mie scattering signal of multiple wavelength can be obtained simultaneously by a probe source, realization can analyze the various element informations such as aerosol extinction characteristic, volume size distribution；High certainty of measurement, to the data analysis precise and high efficiency of measurement result.
Description
Technical field
The invention belongs to aerosol detection engineering device technique fields, are related to a kind of aerosol spy for making light source using white light LEDs
Survey radar system.
Background technology
Currently, atmospheric sounding aerosol is one of important method of Environmental Studies, it can provide wide in range spectral information, side
Us are helped preferably to explain the various phenomenons occurred in an atmosphere, such as the shape of disposal of pollutants and its migration transmission, haze weather
At mechanism, the physics of aerosol and chemical characteristic etc., this all plays an important role to many research fields.However existing gas
For colloidal sol detecting laser radar due to making light source using pulse laser, output wavelength is limited, is unfavorable for development aerosol properties and grinds
Study carefully, it is even more difficulty especially to study the radiation effect of air at specific wavelengths.Meanwhile laser volume is big, driving circuit is multiple
It is miscellaneous, it is of high cost to environmental requirement height, it is difficult in maintenance.
Invention content
The object of the present invention is to provide a kind of aerosol detection radar system for making light source using white light LEDs, solve existing
The problem for having aerosol detection laser radar output wavelength limited.
The technical solution adopted in the present invention is a kind of aerosol detection radar system for making light source using white light LEDs, packet
Include light source part, further include the optical signal receiving portion for being located at same axis with light source part beam emitted, light source part with
Be provided with speculum between optical signal receiving portion, speculum scattered after light source part beam emitted can be made to inject air to
Optical signal receiving portion, optical signal receiving portion are connected with light splitting detection part by optical fiber, and light splitting detection part is connected with number
According to acquisition module, data acquisition module is connected with computer.
The features of the present invention also characterized in that
Optical detector PD is provided at the beam emissions of close to sources part, optical detector PD connects with data acquisition module
It connects.
Light source part includes the white light LEDs and focussed collimated lens group positioned at same axis, and white light LEDs are connected with pulse drive
Dynamic power supply.
Focussed collimated lens group includes being set gradually from the near to the distant at white light LEDs transmitting light beam and being located at same axis
Total internal reflection type collimator, the first lens, diaphragm and the second lens.
The pulse frequency of pulse driving power is 100kHz.
Optical signal receiving portion includes Cassegrain telescope, and aperture is disposed with below Cassegrain telescope
With the first condenser lens, there is Cassegrain telescope primary mirror and secondary mirror, primary mirror to be provided centrally with the first aperture, in aperture
The heart is provided with second orifice, and second orifice is corresponding with the first aperture position.
It includes the second condenser lens being connect with the first condenser lens by optical fiber to be divided detection part, further includes and second
Condenser lens is located at multiple dichroscopes of same axis, the reflecting surface dead astern of dichroscope be disposed with optical filter and
Photomultiplier, and the transmission plane dead astern of the farthest dichroscope of the second condenser lens of distance is disposed with optical filter and light
Electric multiplier tube, photomultiplier are connect with data acquisition module.
Cassegrain telescope bore is 254mm, field angle 13mrad.
Optical filter is spike filter.
The beneficial effects of the invention are as follows：A kind of aerosol detection radar system for making light source using white light LEDs of the present invention
It is simple in structure, it is easy to use；The Mie scattering signal of multiple wavelength can be obtained simultaneously by a probe source, realization can be analyzed
The various element informations such as aerosol extinction characteristic, volume size distribution；High certainty of measurement is accurately high to the data analysis of measurement result
Effect.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of aerosol detection radar system that making light source using white light LEDs of the present invention；
Fig. 2 is focussed collimated lens group in a kind of aerosol detection radar system for making light source using white light LEDs of the present invention
Structural schematic diagram；
Fig. 3 is to be divided detection part in a kind of aerosol detection radar system for making light source using white light LEDs of the present invention
Structural schematic diagram；
Fig. 4 is a kind of white light LEDs of aerosol detection radar system embodiment 1 that making light source using white light LEDs of the present invention
Light source light spectrogram.
In figure, 1. speculums, 2. computers, 3. optical detector PD, 4. pulse driving powers, 5. white light LEDs, 6. focus standard
Straight lens group, 7. apertures, 8. first condenser lenses, 9. second orifices, 10. second condenser lenses, 11. dichroscopes, 12.
Optical filter, 13. photomultipliers, 14. data acquisition modules, 15. Cassegrain telescopes, 16. total internal reflection type collimators,
17. the first lens, 18. diaphragms, 19. second lens.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of aerosol detection radar system for making light source using white light LEDs of the present invention, as shown in Figure 1, including light source portion
Point, further include the optical signal receiving portion for being located at same axis with light source part beam emitted, light source part connects with optical signal
Speculum 1 is provided between receiving portions, speculum 1 scatters after light source part beam emitted can be made to inject air to optical signal
Receiving portion, optical signal receiving portion are connected with light splitting detection part by optical fiber, and light splitting detection part is connected with data acquisition
Module 14, data acquisition module 14 are connected with computer 2, and optical detector PD3 is provided at the beam emissions of close to sources part,
Optical detector PD3 is connect with data acquisition module 14.
Light source part includes the white light LEDs 5 and focussed collimated lens group 6 positioned at same axis, and white light LEDs 5 are connected with arteries and veins
Rush the pulse driving power 4 that frequency is 100kHz.
As shown in Fig. 2, focussed collimated lens group 6 include apart from white light LEDs 5 emit light beam at set gradually from the near to the distant and
Positioned at the total internal reflection type collimator 16 of same axis, the first lens 17, diaphragm 18 and the second lens 19.
Optical signal receiving portion includes that bore is 254mm, and field angle is the Cassegrain telescope 15 of 13mrad, casey lattice
15 lower section of woods telescope is disposed with aperture 7 and the first condenser lens 8, and Cassegrain telescope 15 has primary mirror and pair
Mirror, primary mirror are provided centrally with the first aperture, and aperture 7 is provided centrally with second orifice 9, and second orifice 9 and the first aperture
Position corresponds to.
As shown in figure 3, light splitting detection part includes the second condenser lens being connect with the first condenser lens 8 by optical fiber
10, further include the multiple dichroscopes 11 for being located at same axis with the second condenser lens 10, the reflecting surface of dichroscope 11 just after
Fang Jun is disposed with spike filter and photomultiplier 13, and the farthest dichroscope 11 of distance the second condenser lens 10
Transmission plane dead astern is disposed with spike filter and photomultiplier 13, photomultiplier 13 with data acquisition module 14
Connection.
A kind of course of work of aerosol detection radar system that making light source using white light LEDs of the present invention is specific as follows：
Pulse driving power 4 is opened, the light beam that white light LEDs 5 are sent out carries out level-one standard by total internal reflection type collimator 16
Directly, the angle of divergence of light beam is compressed within 5 ° by total internal reflection type collimator 16, which passes through the first lens 17, light successively again
Door screen 18 and the second lens 19 carry out two level collimation, and then light beam projects, and the light beam that white light LEDs 5 are sent out passes through focussed collimated lens
The collimation that group 6 realizes milliradian grade, optical detector PD3 are monitored the signal frequency of outgoing beam, and by real time data
Incoming data acquisition module 14, then computer 2 is sent to by data acquisition module 14, outgoing beam is again after the reflection of speculum 1
Horizontal or vertical injection air, the light after atmospheric backscatter are received by Cassegrain telescope 22, and successively through small holes
Diaphragm 7 and the first condenser lens 8 are transferred to the second condenser lens 10 by optical fiber, and light is further through directive two after the second condenser lens 10
To Look mirror 11, dichroscope 11 makes a part of light penetrate according to wavelength, and remaining light reflection, optical filter 12 make through dichroscope 11
The light of reflection selectively penetrates, wherein 11 distance the second condenser lens 10 of dichroscope of transmission is remoter, then penetrates dichroscope
The wavelength of 11 light is longer, and selectivity penetrates the light of optical filter 12 after the detection of photomultiplier 13, and the echo detected is believed
Data are sent into computer 2 by data acquisition module 14 and carry out analyzing processing by number incoming data acquisition module 14.
Computer 2, i.e. by solving Mie scattering radar equation, finds out the delustring system of aerosol to the processing of echo-signal
Number, then acquires the information such as atmospheric visibility, aerosol particle Spectral structure.
Mie scattering radar equation is：
(1) in formula, P (z) is the echo signal power at z to z+ Δ z distances that receives of radar, z be detect away from
From Δ z is distance resolution, and C is the system constants of radar, and q is the efficiency (i.e. optical efficiency × PMT in channel of corresponding channel
Quantum efficiency), P0To emit the power of light beam, Ar is the receipts light area of receiving telescope, and Y (z) is overlap factor, and β (z) is
The backscattering coefficient of detected component, α (z) are Aerosol Extinction.
Wherein, under the conditions of level detection, air approaches uniformity can easily carry out radar equation using Slope Method
It solves.
Slope Method solution procedure is specific as follows：
Enable D (z)=ln [P (z) z2]
Then Aerosol Extinction is：
According to Mie theory, the light wave of different wave length occurs for particulate optical effect and its particle size
Related, the light wave of different wave length is different to the sensibility of different-grain diameter particle, the optical coefficient of multiple wavelength can be utilized to obtain
The size distribution information of particle.The optical coefficient of spherical particulate can be with first kind Fredholm integral representations：
(2) in formula, giFor aerosol optical coefficient, i is the type of optical coefficient, Qi(r, m, λ) is the efficiency of optical effect
The factor, r are particle radii, and m is complex refractivity index, and λ is lambda1-wavelength, and dn (λ)/dr represents population density Spectral structure.
A kind of aerosol detection radar system for making light source using white light LEDs of the present invention detects echo data, by anti-
It drills (1) formula and obtains the optical coefficient g of multiple wavelengthiAfterwards, integral equation (2) formula is solved by Tikhonov regularization methods to obtain
Number density is composed, and (2) formula is rewritten into the volume spectrum and surface area of the available particulate of form of volume spectrum and surface area spectrum
Spectrum, further calculates to obtain the micro-physical features such as effective radius, volumetric concentration, surface area concentration.
Embodiment 1
The present embodiment provides a kind of aerosol detection radar systems for making light source using white light LEDs, including light source part, also
Include the optical signal receiving portion for being located at same axis with light source part beam emitted, light source part and optical signal receiving portion
Between be provided with speculum 1, speculum 1 scatters after light source part beam emitted can be made to inject air to optical signal receiving part
Point, optical signal receiving portion is connected with light splitting detection part by optical fiber, and light splitting detection part is connected with data acquisition module 14,
Data acquisition module 14 is connected with computer 2, and optical detector PD3, optical detection are provided at the beam emissions of close to sources part
Device PD3 is connect with data acquisition module 14.
Light source part includes the white light LEDs 5 and focussed collimated lens group 6 positioned at same axis, and white light LEDs 5 are connected with arteries and veins
The pulse driving power 4 that frequency is 100kHz is rushed, it is the warm yellow light white light LEDs of 3W that white light LEDs 5, which select single power, the warm Huang
The spectrogram of light white light LEDs is as shown in Figure 4.
Focussed collimated lens group 6 includes emitting to set gradually from the near to the distant at light beam and be located at same axis apart from white light LEDs 5
The total internal reflection type collimator 16 of line, the first lens 17, diaphragm 18 and the second lens 19.
Optical signal receiving portion includes that bore is 254mm, and field angle is the Cassegrain telescope 15 of 13mrad, casey lattice
15 lower section of woods telescope is disposed with aperture 7 and the first condenser lens 8, and Cassegrain telescope 15 has primary mirror and pair
Mirror, primary mirror are provided centrally with the first aperture, and aperture 7 is provided centrally with second orifice 9, and second orifice 9 and the first aperture
Position corresponds to.
Be divided detection part include the second condenser lens 10 being connect with the first condenser lens 8 by optical fiber, further include and
Second condenser lens 10 is located at three dichroscopes 11 of same axis, and the reflecting surface dead astern of three dichroscopes 11 is successively
Be provided with spike filter and photomultiplier 13, and farthest 11 transmission plane of dichroscope of distance the second condenser lens 10 just after
Side is disposed with spike filter and photomultiplier 13, and photomultiplier 13 is connect with data acquisition module 14.
Wherein, the 11 passable long wavelength of dichroscope of the second condenser lens of distance 10 from the near to the distant is followed successively by not small
In 490nm, it is not less than 567nm and is not less than 638nm, and the peak of curve section of the spectrogram of warm yellow white light LEDs according to fig. 3
Choose corresponding with three dichroscopes 11 spike filter can be respectively by the centre wavelength of long wave 450nm, 525nm,
600nm, 661nm, wherein can be located at together for the spike filter of 661nm and three dichroscopes 11 by the centre wavelength of long wave
One axis.
Pulse driving power 4 is opened, the light beam that white light LEDs 5 are sent out carries out level-one standard by total internal reflection type collimator 16
Directly, the angle of divergence of light beam is compressed within 5 ° by total internal reflection type collimator 16, which passes through the first lens 17, light successively again
Door screen 18 and the second lens 19 carry out two level collimation, and then light beam projects, and the light beam that white light LEDs 5 are sent out passes through focussed collimated lens
The collimation that group 6 realizes milliradian grade, optical detector PD3 are monitored the signal frequency of outgoing beam, and by real time data
Incoming data acquisition module 14, then computer 2 is sent to by data acquisition module 14, outgoing beam is again after the reflection of speculum 1
Horizontal or vertical injection air, the light after atmospheric backscatter are received by Cassegrain telescope 22, and successively through small holes
Diaphragm 7 and the first condenser lens 8 are transferred to the second condenser lens 10 by optical fiber, and light can further through directive after the second condenser lens 10
By long wavelength be not less than the dichroscope 11 of 490nm, light is first divided by the dichroscope 11 for two parts, and wavelength is less than
The light of 490nm is reflected, and after centre wavelength is the spike filter of 450nm, by corresponding photomultiplier 13
Detection, wavelength are transmitted more than or equal to the light of 490nm, and be irradiated to passable long wavelength not less than 567nm two to
Light beam is divided into two parts by Look mirror 11, the dichroscope 11 again, and light of the wavelength less than 567nm is reflected, and passes through centre wavelength
It after the spike filter of 525nm, is detected by corresponding photomultiplier 13, wavelength is greater than or equal to the light quilt of 567nm
Transmission, and it is irradiated to the dichroscope 11 that passable long wavelength is not less than 638nm, which is again divided into light beam
Two parts, light of the wavelength less than 638nm is reflected, and after centre wavelength is the spike filter of 600nm, is corresponding to it
Photomultiplier 13 detect, wavelength is transmitted more than or equal to the light of 638nm, using the narrowband that centre wavelength is 661nm
After optical filter, detected by corresponding photomultiplier 13.In this way, the light splitting in the present embodiment can be carried with detection part
Get the Received Signal of four wavelength:450nm, 525nm, 600nm and 661nm, by the incoming number of the echo-signal detected
According to acquisition module 14, data are sent into computer 2 by data acquisition module 14 and carry out analyzing processing, finally obtain atmospheric aerosol
Extinction coefficient, atmospheric visibility, Angstrom indexes and aerosol particle Spectral structure.
By the above-mentioned means, a kind of aerosol detection radar system structure letter for making light source using white light LEDs of the present invention
It is single, it is easy to use；The Mie scattering signal of multiple wavelength can be obtained simultaneously by a probe source, realization can analyze aerosol
The various element informations such as Extinction Characteristic, volume size distribution；High certainty of measurement, to the data analysis precise and high efficiency of measurement result.
Claims (9)
1. a kind of aerosol detection radar system for making light source using white light LEDs, which is characterized in that including light source part, also wrap
Include the optical signal receiving portion for being located at same axis with light source part beam emitted, the light source part and optical signal receiving part
/ it is provided with speculum (1), the speculum (1) scatters after light source part beam emitted can be made to inject air to light
Signal receiving part point, the optical signal receiving portion are connected with light splitting detection part by optical fiber, and the light splitting detection part connects
It is connected to data acquisition module (14), the data acquisition module (14) is connected with computer (2).
2. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 1, feature are existed
In described to be provided with optical detector PD (3) at the beam emissions of close to sources part, the optical detector PD (3) is adopted with data
Collect module (14) to connect.
3. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 1, feature are existed
In the light source part includes the white light LEDs (5) and focussed collimated lens group (6) positioned at same axis, the white light LEDs (5)
It is connected with pulse driving power (4).
4. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 3, feature are existed
In the focussed collimated lens group (6) includes being set gradually from the near to the distant at white light LEDs (5) transmitting light beam and positioned at same
Total internal reflection type collimator (16), the first lens (17), diaphragm (18) and the second lens (19) of one axis.
5. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 3, feature are existed
In the pulse frequency of the pulse driving power (4) is 100kHz.
6. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 1, feature are existed
In the optical signal receiving portion includes Cassegrain telescope (15), is set successively below the Cassegrain telescope (15)
It is equipped with aperture (7) and the first condenser lens (8), the Cassegrain telescope (15) has primary mirror and secondary mirror, the master
Mirror is provided centrally with the first aperture, and the aperture (7) is provided centrally with second orifice (9), and second orifice (9) and first
Aperture position corresponds to.
7. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 6, feature are existed
In the light splitting detection part includes the second condenser lens (10) being connect with the first condenser lens (8) by optical fiber, further includes
Be located at multiple dichroscopes (11) of same axis with the second condenser lens (10), the reflecting surface of the dichroscope (11) just after
Side is disposed with optical filter (12) and photomultiplier (13), and the dichroscope that the second condenser lens of distance (10) is farthest
(11) projection surface dead astern is disposed with optical filter (12) and photomultiplier (13), the photomultiplier (13) with
Data acquisition module (14) connects.
8. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 6, feature are existed
In Cassegrain telescope (15) bore is 254mm, field angle 13mrad.
9. a kind of aerosol detection radar system for being made light source using white light LEDs according to claim 6, feature are existed
In the optical filter (12) is spike filter.
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