CN107796742A - A kind of device for calibrating air group concentration detecting laser radar - Google Patents
A kind of device for calibrating air group concentration detecting laser radar Download PDFInfo
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- CN107796742A CN107796742A CN201710854251.XA CN201710854251A CN107796742A CN 107796742 A CN107796742 A CN 107796742A CN 201710854251 A CN201710854251 A CN 201710854251A CN 107796742 A CN107796742 A CN 107796742A
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- 239000013307 optical fiber Substances 0.000 claims abstract description 91
- 230000003287 optical effect Effects 0.000 claims abstract description 32
- 238000000180 cavity ring-down spectroscopy Methods 0.000 claims abstract description 14
- 239000004065 semiconductor Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims description 39
- 238000005259 measurement Methods 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims 2
- 238000004904 shortening Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 110
- 238000001514 detection method Methods 0.000 description 16
- 239000000835 fiber Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The present invention relates to a kind of device for calibrating air group concentration detecting laser radar, the device includes：Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；The calibrating gas pond includes：Multigroup plane mirror and semiconductor laser with tunable, wherein semiconductor laser with tunable are mutually perpendicular to multigroup plane mirror.Another device is further related to, the device includes：The device includes：Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；The calibrating gas pond includes：Multigroup plane mirror and optical cavity ring-down device CRDS, wherein optical cavity ring-down device CRDS are mutually perpendicular to multigroup plane mirror.Pass through the device of the present invention, greatly reduce the space of calibrating installation and the consumption to calibrating gas, beam Propagation space length necessary to shortening significantly is born simultaneously, the requirement standard to pond internal standard gas inflated is greatly reduced, and can more accurately obtain gas concentration in gas cell.
Description
Technical field
The invention belongs to radar detection atmospheric concentration field, more particularly to a kind of calibration air group concentration detecting laser radar
Device.
Background technology
Now relatively common constituent of atomsphere concentration detection is by laser radar detection method, and it is by reclaiming and dividing
The methods of the sent laser of analysis is by the wavelength of the rear orientation light of airspace gas molecule, frequency, polarization, to laser institute
Constituent of atomsphere concentration to region carries out long-range detection.So, be will no longer be required in measurement using aircraft, fire balloon, wind
The aircraft such as zither go to detection point sampling.Particularly carrying out detection in the upper atmosphere for being difficult to reach to general aircraft is, swashs
Optical radar detection method has incomparable advantage, but the detection accuracy of laser radar and precision are very low.
To improve the detection accuracy of laser radar and precision, it is necessary to be calibrated to laser radar.Than relatively straightforward school
Quasi- method is using radar detection system and radiosonde (or aircraft carrying sampling analysis) while to a certain click-through in space
Row detection, and compare its measurement result.But due to the concentration of each component in natural atmosphere space do not have under normal circumstances it is larger
Change, therefore, this method are typically only capable to calibrate a concentration point or the less several concentration points of difference.It is another relatively conventional
Calibration method be by monitoring means calibrate laser radar in critical component parameter, this calibration method be commonly referred to as from
Calibration.Self calibration avoids can only be to the calibration problem of some measurement of concetration point, but is not to the whole of laser radar system
Sports school is accurate.If measurement error (or even mistake) has been appeared on part that is not monitored and calibrating, larger survey can be produced
Measure deviation, or even mistake.2014, both the above thinking was combined by United Kingdom National physics laboratory (NPL), and is manually established
Large-scale gas cell and gas generating unit, gas zones known to generation concentration are calibrated to laser radar.The method is temporary
When yet there are no the report of public occasion.Although the method is it is possible to prevente effectively from the problem of the presence of first two method, its school
Not only own vol is huge (system itself is taken up an area more than 10 square meters) for Barebone, not easily shifted, and is calibrated to laser radar
When need to be positioned over the measurement blind area of laser radar (according to radar species not Ah same, measurement blind area is from tens meters to several kms)
Outside, this to select calibration location also to become more difficult.In addition, the standard of the manual emission used in the calibration system
Gas can only be directly discharged into air, and not only individual calibration is very big to the consumption of calibrating gas, and easily causes to air
Secondary pollution.Therefore, NPL is very low using the frequency of the system.So, resulted in long period interval twice calibration it
Between, if there is larger deviation in part not monitored in radar system, the measurement result of radar similarly will appear from compared with
Large deviation.
The content of the invention
The technical problems to be solved by the invention are：Exist in the prior art the calibration system own vol that uses it is huge,
Selection calibration location is difficult, individual calibration is very big to the consumption of calibrating gas and easily causes the secondary pollution to air, together
When measurement result the problem of relatively large deviation is big can occur because of the deviation in radar system.
To solve technical problem above, the invention provides a kind of dress for calibrating air group concentration detecting laser radar
Put, the device includes：Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；The calibrating gas pond
Including：Multigroup plane mirror and semiconductor laser with tunable, wherein the semiconductor laser with tunable with it is described multigroup
Plane mirror is mutually perpendicular to；The port in the calibrating gas pond forms certain inclination angle, and the end of the optical fiber with laser beam
Mouth also forms certain inclination angle with laser beam, while the optical fiber is large-numerical aperture optical fiber；
The laser beam treatment module, the optical fiber and the collimation lens are successively set in same optical axis；
The laser radar, for projecting first laser beam；
After the first laser beam passes sequentially through the laser beam treatment module, the optical fiber and collimation lens processing
Project to the calibrating gas pond；
The calibrating gas pond, for absorbing the performance of laser spectrum using multi-way reflection and tunable diode to processing
The first laser Shu Zaici processing afterwards, obtains second laser beam；
After the second laser beam projects from the calibrating gas pond, Yan Yuanlu passes sequentially through the collimation lens, described
The laser radar is fed back to after optical fiber and the laser beam treatment resume module；
The laser radar, it is additionally operable to by the second laser Shu Jinhang after the laser beam treatment resume module points
Analysis, whether the difference between discriminatory analysis result and preset standard gas is in error allowed band, if so, the then laser thunder
It is accurate up to measurement result.
Beneficial effects of the present invention：By above-mentioned device, the space of calibrating installation is greatly reduced and to standard
The consumption of gas, and first laser beam is through excessive numerical value optical fiber processing, significantly bear beam Propagation space necessary to shortening away from
From, and fiber end face (containing incidence end and exit end) and the incidence in calibrating gas pond and exit window are designed using inclination angle,
Photodetector in back scattering laser hazard laser radar is prevented, increasing tunable semiconductor in calibrating gas pond in addition swashs
Light device, the requirement standard to pond internal standard gas inflated is substantially reduced, and it is dense more accurately to obtain gas pool gas
Degree, so as to more accurately detect the correction situation of radar.
Further, the laser beam treatment module, specifically for the first laser beam is focused into processing；
The optical fiber, specifically for the angle of divergence of the first laser beam after adjustment focusing；
The collimation lens, specifically for accurate to the first laser Shu Jinhang after the optical fiber adjusts the angle of divergence
Projected after straight to the calibrating gas pond.
Further, the calibrating gas pond, specifically for the second laser beam is exported to the collimation lens；
The collimation lens, specifically for being collimated to the second laser Shu Jinhang reflected by calibrating gas pond；
The optical fiber, the angle of divergence specifically for adjusting the second laser beam after being collimated by the collimation lens；
The laser beam treatment module, enter specifically for the second laser beam after the optical fiber adjusts the angle of divergence
Row processing, and export to the laser radar.
Further, the laser beam treatment module includes：Condenser lens, plane mirror and concave mirror, wherein described
Distance is less than 1 meter between plane mirror and the concave mirror；
The optical axis of the condenser lens, the plane mirror and the concave mirror on the same line, and described first
After laser beam passes sequentially through the condenser lens, the plane mirror and concave mirror processing, project to the optical fiber；
The second laser beam is after optical fiber injection, after being handled by the concave mirror scattering, exports to described and swashs
Optical radar.
Above-mentioned through a step beneficial effect：By the adjustment of optical fiber, beam Propagation space length necessary to significantly shortening.
Further, the condenser lens, specifically for the first laser beam is focused；
The plane mirror, projected specifically for the first laser beam after focusing by its centre bore to described recessed
The centre bore of face mirror, will pass through the entrance that the centre bore of the concave mirror enters the light.
The invention further relates to a kind of device for calibrating air group concentration detecting laser radar, the device includes：
Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；
The calibrating gas pond includes：Multigroup plane mirror and optical cavity ring-down device CRDS, wherein the optical cavity ring-down device
CRDS is mutually perpendicular to multigroup plane mirror；The port in the calibrating gas pond forms certain inclination angle with laser beam,
And the port of the optical fiber also forms certain inclination angle with laser beam, while the optical fiber is large-numerical aperture optical fiber；
The laser beam treatment module, the optical fiber and the collimation lens are successively set in same optical axis；
The laser radar, for projecting first laser beam；
The first laser beam passes sequentially through the processing of the laser beam treatment module, the optical fiber and the collimation lens
After project to the calibrating gas pond；
The calibrating gas pond, for absorbing the performance of laser spectrum using multi-way reflection and tunable diode to processing
The first laser Shu Zaici processing afterwards, obtains second laser beam；
After the second laser beam projects from the calibrating gas pond, Yan Yuanlu passes sequentially through the collimation lens, described
The laser radar is fed back to after optical fiber and the laser beam treatment resume module；
The laser radar, it is additionally operable to by the second laser Shu Jinhang after the laser beam treatment resume module points
Analysis, whether the difference between discriminatory analysis result and preset standard gas is in error allowed band, if so, the then laser thunder
It is accurate up to measurement result.
Beneficial effects of the present invention：By above-mentioned device, the space of calibrating installation is greatly reduced and to standard
The consumption of gas, and fiber end face (containing incidence end and exit end) and the incidence in calibrating gas pond and exit window use
Inclination angle is designed, and is prevented photodetector in back scattering laser hazard laser radar, is increased optical cavity in calibrating gas pond in addition
Decline and swing device CRDS, reduce the requirement standard to pond internal standard gas inflated, and existing gas the most accurate in the world can be realized
Bulk concentration detection accuracy, so as to more accurately detect the correction situation of radar.
Further, the laser beam treatment module, specifically for the first laser beam is focused into processing；
The optical fiber, specifically for the angle of divergence of the first laser beam after adjustment focusing；
The collimation lens, specifically for accurate to the first laser Shu Jinhang after the optical fiber adjusts the angle of divergence
Projected after straight to the calibrating gas pond.
Further, the calibrating gas pond, specifically for the second laser beam is exported to the collimation lens；
The collimation lens, specifically for being collimated to the second laser Shu Jinhang reflected by calibrating gas pond；
The optical fiber, the angle of divergence specifically for adjusting the second laser beam after being collimated by the collimation lens；
The laser beam treatment module, enter specifically for the second laser beam after the optical fiber adjusts the angle of divergence
Row processing, and export to the laser radar.
Above-mentioned through a step beneficial effect：By the adjustment of optical fiber, beam Propagation space length necessary to significantly shortening.
Further, the laser beam treatment module includes：Condenser lens, plane mirror, concave mirror, wherein described flat
Distance is less than 1 meter between face speculum and the concave mirror；
The optical axis of the condenser lens, the plane mirror and the concave mirror on the same line, and described first
After laser beam passes sequentially through the condenser lens, the plane mirror and concave mirror processing, project to the optical fiber；
The second laser beam is after optical fiber injection, after being handled by the concave mirror scattering, exports to described and swashs
Optical radar.
Further, the condenser lens, specifically for the first laser beam is focused；
The plane mirror, projected specifically for the first laser beam after focusing by its centre bore to described recessed
The centre bore of face mirror, will pass through the entrance that the centre bore of the concave mirror enters the light.
Brief description of the drawings
Fig. 1 is a kind of apparatus structure schematic diagram for calibrating air group concentration detecting laser radar of the embodiment of the present invention；
Fig. 2 is a kind of apparatus structure schematic diagram for calibrating air group concentration detecting laser radar of another embodiment of the present invention.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in figure 1, provided in an embodiment of the present invention is a kind of device for calibrating air group concentration detecting laser radar, should
Device includes：
Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；The calibrating gas pond includes：
Multigroup plane mirror and semiconductor laser with tunable, wherein the semiconductor laser with tunable and multigroup plane are anti-
Mirror is penetrated to be mutually perpendicular to；The port in the calibrating gas pond forms certain inclination angle with laser beam, and the port of the optical fiber is also equal
Certain inclination angle is formed with laser beam, while the optical fiber is large-numerical aperture optical fiber；
The laser beam treatment module, the optical fiber and the collimation lens are successively set in same optical axis；
The laser radar, for projecting first laser beam；
After the first laser beam passes sequentially through the laser beam treatment module, the optical fiber and collimation lens processing
Project to the calibrating gas pond；
The calibrating gas pond, for absorbing the performance of laser spectrum using multi-way reflection and tunable diode to processing
The first laser Shu Zaici processing afterwards, obtains second laser beam；
After the second laser beam projects from the calibrating gas pond, Yan Yuanlu passes sequentially through the collimation lens, described
The laser radar is fed back to after optical fiber and the laser beam treatment resume module；
The laser radar, it is additionally operable to by the second laser Shu Jinhang after the laser beam treatment resume module points
Analysis, whether the difference between discriminatory analysis result and preset standard gas is in error allowed band, if so, the then laser thunder
It is accurate up to measurement result.
It should be noted that it is that the laser beam for detection, first laser are projected from laser radar in the present embodiment
Beam is incident upon plane mirror after the centre bore of condenser lens is focused, and is injected after the centre bore of plane mirror
To fiber port, wherein fiber lengths after fiber port injection, it is saturating can to enter collimation according to needing to arrive several kms for several meters
Calibrating gas pond is entered after mirror collimation, after the first laser beam is handled in calibrating gas pond, obtains second laser beam, this
Dual-laser beam is projected along original entrance, injects collimation lens, and fiber port is injected after collimation lens, by optical fiber
By after concave mirror or convex lens processing after processing, inject inside laser radar.Wherein it is due to be full of in calibrating gas pond
Main constituent and the calibrating gas of each component concentration, when laser passes through calibrating gas pond, molecule is to laser photon in gas cell
Back scattering will be along backtracking to former fiber-optic output, and travel in optical fiber former input output.Now, export
Second laser beam divergence angle will be determined by the intrinsic numerical aperture of optical fiber.In addition, calibrating gas pond Zhong Bao in this application
Include：Multigroup plane mirror and semiconductor laser with tunable, the wherein semiconductor laser with tunable and multigroup plane are anti-
Mirror is penetrated to be mutually perpendicular to；Semiconductor laser with tunable is added so that TDLAS technologies and multi-way reflect while used, is substantially reduced
To the requirement standard of pond internal standard gas inflated, and it can more accurately obtain gas concentration in gas cell.
Wherein, use in the present embodiment and used large-numerical aperture optical fiber, now from fiber-optic output output
Light beam is by the output light cone angle with 13 ° of α ≈.Now, to be expanded to the light beam of radius ω=0.25 meter, space therebetween passes
Defeated distance is aboutRice.That is the distance between plane mirror M1 to concave mirror M2 is less than 1 meter.
Rear orientation light after beam-expanding collimation is received by the receiving telescope of laser radar, and is passed to photodetection
After device processing, the gas concentration value in the calibrating gas pond that it is detected is obtained.This numerical value and known standard gas concentration value phase
Compare, you can obtain the uncertainty of measurement of laser radar, realize calibration or demarcation to laser radar.Pass through calibrating gas pond
Gas entrance and gas outlet, calibrating gas pool gas concentration and component can be changed, realized to multiple gases exploring laser light
The calibration or demarcation of radar.
Optical element in whole system is coated with that broadband (200nm-3600nm) is anti-reflection or high-reflecting film to laser.Standard Gases
Body pond has air-tightness, and it can be kept after calibrating gas is filled with measuring section (being usually 1 day -1 week) interior constant concentration.
For the more labile gas such as ozone, then ensure gas pool gas in time of measuring by way of taking and circulating
Constant concentration in section.
Alternatively, the laser beam treatment module in another embodiment, specifically for by the first laser Shu Jinhang
Focusing；
The optical fiber, specifically for the angle of divergence of the first laser beam after adjustment focusing；
The collimation lens, specifically for accurate to the first laser Shu Jinhang after the optical fiber adjusts the angle of divergence
Projected after straight to the calibrating gas pond.
Alternatively, the calibrating gas pond in another embodiment, specifically for the second laser beam is exported to institute
State collimation lens；
The collimation lens, specifically for being collimated to the second laser Shu Jinhang reflected by calibrating gas pond；
The optical fiber, the angle of divergence specifically for adjusting the second laser beam after being collimated by the collimation lens；
The laser beam treatment module, enter specifically for the second laser beam after the optical fiber adjusts the angle of divergence
Row processing, and export to the laser radar.
It should be noted that pass through the adjustment of optical fiber in the present embodiment, beam Propagation space necessary to significantly shortening
Distance.
Alternatively, the laser beam treatment module includes in another embodiment：Condenser lens, plane mirror, concave surface
Mirror, wherein distance is less than 1 meter between the plane mirror and the concave mirror；
The optical axis of the condenser lens, the plane mirror and the concave mirror on the same line, and described first
After laser beam passes sequentially through the condenser lens, the plane mirror and concave mirror processing, project to the optical fiber；
The second laser beam is after optical fiber injection, after being handled by the concave mirror scattering, exports to described and swashs
Optical radar.
Alternatively, the condenser lens in another embodiment, specifically for the first laser beam is focused；
The plane mirror, projected specifically for the first laser beam after focusing by its centre bore to described recessed
The centre bore of face mirror, will pass through the entrance that the centre bore of the concave mirror enters the light.
As shown in Fig. 2 the embodiment of the present invention further relates to a kind of device for calibrating air group concentration detecting laser radar, the dress
Put including：
Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；
The calibrating gas pond includes：Multigroup plane mirror and optical cavity ring-down device CRDS, wherein the optical cavity ring-down device
CRDS is mutually perpendicular to multigroup plane mirror；The port in the calibrating gas pond forms certain inclination angle with laser beam,
And the port of the optical fiber also forms certain inclination angle with laser beam；
The laser beam treatment module, the optical fiber and the collimation lens are successively set in same optical axis；
The laser radar, for projecting first laser beam；
The first laser beam passes sequentially through the processing of the laser beam treatment module, the optical fiber and the collimation lens
After project to the calibrating gas pond；
The calibrating gas pond, for absorbing the performance of laser spectrum using multi-way reflection and tunable diode to processing
The first laser Shu Zaici processing afterwards, obtains second laser beam；
After the second laser beam projects from the calibrating gas pond, Yan Yuanlu passes sequentially through the collimation lens, described
The laser radar is fed back to after optical fiber and the laser beam treatment resume module；
The laser radar, it is additionally operable to by the second laser Shu Jinhang after the laser beam treatment resume module points
Analysis, whether the difference between discriminatory analysis result and preset standard gas is in error allowed band, if so, the then laser thunder
It is accurate up to measurement result.
It should be noted that it is that the laser beam for detection, first laser are projected from laser radar in the present embodiment
Beam is incident upon plane mirror after the centre bore of condenser lens is focused, and is injected after the centre bore of plane mirror
To fiber port, wherein fiber lengths after fiber port injection, it is saturating can to enter collimation according to needing to arrive several kms for several meters
Calibrating gas pond is entered after mirror collimation, after the first laser beam is handled in calibrating gas pond, obtains second laser beam, this
Dual-laser beam is projected along original entrance, injects collimation lens, and fiber port is injected after collimation lens, by optical fiber
By after concave mirror or convex lens processing after processing, inject inside laser radar.Wherein it is due to be full of in calibrating gas pond
Main constituent and the calibrating gas of each component concentration, when laser passes through calibrating gas pond, molecule is to laser photon in gas cell
Back scattering will be along backtracking to former fiber-optic output, and travel in optical fiber former input output.Now, export
Second laser beam divergence angle will be determined by the intrinsic numerical aperture of optical fiber.In addition, the calibrating gas pond includes：It is multigroup flat
Face speculum and optical cavity ring-down device CRDS, wherein the optical cavity ring-down device CRDS are mutually perpendicular to multigroup plane mirror；Increase
Optical cavity ring-down device CRDS so that CRDS technologies use simultaneously with multi-way reflection.Reduce the requirement to pond internal standard gas inflated
Standard, and existing gas concentration detection accuracy the most accurate in the world can be realized.
Wherein, use in the present embodiment and used large-numerical aperture optical fiber, now from fiber-optic output output
Light beam is by the output light cone angle with 13 ° of α ≈.Now, to be expanded to the light beam of radius ω=0.25 meter, space therebetween passes
Defeated distance is aboutRice.That is the distance between plane mirror M1 to concave mirror M2 is less than 1 meter.
Rear orientation light after beam-expanding collimation is received by the receiving telescope of laser radar, and is passed to photodetection
After device processing, the gas concentration value in the calibrating gas pond that it is detected is obtained.This numerical value and known standard gas concentration value phase
Compare, you can obtain the uncertainty of measurement of laser radar, realize calibration or demarcation to laser radar.Pass through calibrating gas pond
Gas entrance and gas outlet, calibrating gas pool gas concentration and component can be changed, realized to multiple gases exploring laser light
The calibration or demarcation of radar.
Optical element in whole system is coated with that broadband (200nm-3600nm) is anti-reflection or high-reflecting film to laser.Standard Gases
Body pond has air-tightness, and it can be kept after calibrating gas is filled with measuring section (being usually 1 day -1 week) interior constant concentration.
For the more labile gas such as ozone, then ensure gas pool gas in time of measuring by way of taking and circulating
Constant concentration in section.
By above-mentioned device, the space of calibrating installation and the consumption to calibrating gas are greatly reduced, and light
Fine end face (containing incidence end and exit end) and the incidence in calibrating gas pond and exit window are designed using inclination angle, are prevented backward
Photodetector in scattering laser injury laser radar, increases optical cavity ring-down device CRDS, reduction pair in calibrating gas pond in addition
The requirement standard of pond internal standard gas inflated, and existing gas concentration detection accuracy the most accurate in the world can be realized, from
And more accurately detect the correction situation of radar.
Alternatively, the laser beam treatment module in another embodiment, specifically for by the first laser Shu Jinhang
Focusing；
The optical fiber, specifically for the angle of divergence of the first laser beam after adjustment focusing；
The collimation lens, specifically for accurate to the first laser Shu Jinhang after the optical fiber adjusts the angle of divergence
Projected after straight to the calibrating gas pond.
Alternatively, the calibrating gas pond in another embodiment, specifically for the second laser beam is exported to institute
State collimation lens；
The collimation lens, specifically for being collimated to the second laser Shu Jinhang reflected by calibrating gas pond；
The optical fiber, the angle of divergence specifically for adjusting the second laser beam after being collimated by the collimation lens；
The laser beam treatment module, enter specifically for the second laser beam after the optical fiber adjusts the angle of divergence
Row processing, and export to the laser radar.
It should be noted that pass through the adjustment of optical fiber in the present embodiment, beam Propagation space necessary to significantly shortening
Distance.
Alternatively, the laser beam treatment module includes in another embodiment：Condenser lens, plane mirror, concave surface
Mirror, wherein distance is less than 1 meter between the plane mirror and the concave mirror；
The optical axis of the condenser lens, the plane mirror and the concave mirror on the same line, and described first
After laser beam passes sequentially through the condenser lens, the plane mirror and concave mirror processing, project to the optical fiber；
The second laser beam is after optical fiber injection, after being handled by the concave mirror scattering, exports to described and swashs
Optical radar.
Alternatively, the condenser lens in another embodiment, specifically for the first laser beam is focused；
The plane mirror, projected specifically for the first laser beam after focusing by its centre bore to described recessed
The centre bore of face mirror, will pass through the entrance that the centre bore of the concave mirror enters the light.
In this manual, identical embodiment or example are necessarily directed to the schematic representation of above-mentioned term.
Moreover, specific features, structure, material or the feature of description can be in any one or more embodiments or example with suitable
Mode combines.In addition, in the case of not conflicting, those skilled in the art can be by the difference described in this specification
Embodiment or example and the feature of different embodiments or example are combined and combined.
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 (10)
1. a kind of device for calibrating air group concentration detecting laser radar, it is characterised in that the device includes：
Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；The calibrating gas pond includes：It is multigroup
Plane mirror and semiconductor laser with tunable, wherein the semiconductor laser with tunable and multigroup plane mirror
It is mutually perpendicular to；The port in the calibrating gas pond forms certain inclination angle with laser beam, and the port of the optical fiber is also with swashing
Light beam forms certain inclination angle, while the optical fiber is large-numerical aperture optical fiber；
The laser beam treatment module, the optical fiber and the collimation lens are successively set in same optical axis；
The laser radar, for projecting first laser beam；
The first laser beam projects after passing sequentially through the laser beam treatment module, the optical fiber and collimation lens processing
To the calibrating gas pond；
The calibrating gas pond, after using the performance of multi-way reflection and tunable diode absorption laser spectrum to processing
The first laser Shu Zaici processing, obtains second laser beam；
After the second laser beam projects from the calibrating gas pond, Yan Yuanlu passes sequentially through the collimation lens, the optical fiber
The laser radar is fed back to after the laser beam treatment resume module；
The laser radar, it is additionally operable to being analyzed by the second laser Shu Jinhang after the laser beam treatment resume module,
Whether the difference between discriminatory analysis result and preset standard gas is in error allowed band, if so, the then laser radar
Measurement result is accurate.
2. device according to claim 1, it is characterised in that
The laser beam treatment module, specifically for the first laser beam is focused into processing；
The optical fiber, specifically for the angle of divergence of the first laser beam after adjustment focusing；
The collimation lens, after to the first laser Shu Jinhang collimations after the optical fiber adjusts the angle of divergence
Project to the calibrating gas pond.
3. device according to claim 1, it is characterised in that
The calibrating gas pond, specifically for the second laser beam is exported to the collimation lens；
The collimation lens, specifically for being collimated to the second laser Shu Jinhang reflected by calibrating gas pond；
The optical fiber, the angle of divergence specifically for adjusting the second laser beam after being collimated by the collimation lens；
The laser beam treatment module, at the second laser Shu Jinhang after the optical fiber adjusts the angle of divergence
Reason, and export to the laser radar.
4. according to any described devices of claim 1-3, it is characterised in that the laser beam treatment module includes：Focus on saturating
Mirror, plane mirror and concave mirror, wherein distance is less than 1 meter between the plane mirror and the concave mirror；
The optical axis of the condenser lens, the plane mirror and the concave mirror on the same line, and the first laser
After beam passes sequentially through the condenser lens, the plane mirror and concave mirror processing, project to the optical fiber；
The second laser beam after being handled by the concave mirror scattering, is exported to the laser thunder after optical fiber injection
Reach.
5. device according to claim 4, it is characterised in that
The condenser lens, specifically for the first laser beam is focused；
The plane mirror, projected specifically for the first laser beam after focusing by its centre bore to the concave mirror
Centre bore, will pass through the entrance that the centre bore of the concave mirror enters the light.
6. a kind of device for calibrating air group concentration detecting laser radar, it is characterised in that the device includes：
Laser radar, laser beam treatment module, optical fiber, collimation lens, calibrating gas pond；
The calibrating gas pond includes：Multigroup plane mirror and optical cavity ring-down device CRDS, wherein the optical cavity ring-down device CRDS
It is mutually perpendicular to multigroup plane mirror；The port in the calibrating gas pond forms certain inclination angle, and institute with laser beam
The port for stating optical fiber also forms certain inclination angle with laser beam, while the optical fiber is large-numerical aperture optical fiber；
The laser beam treatment module, the optical fiber and the collimation lens are successively set in same optical axis；
The laser radar, for projecting first laser beam；
The first laser beam is penetrated after passing sequentially through the processing of the laser beam treatment module, the optical fiber and the collimation lens
Go out to the calibrating gas pond；
The calibrating gas pond, after using the performance of multi-way reflection and tunable diode absorption laser spectrum to processing
The first laser Shu Zaici processing, obtains second laser beam；
After the second laser beam projects from the calibrating gas pond, Yan Yuanlu passes sequentially through the collimation lens, the optical fiber
The laser radar is fed back to after the laser beam treatment resume module；
The laser radar, it is additionally operable to being analyzed by the second laser Shu Jinhang after the laser beam treatment resume module,
Whether the difference between discriminatory analysis result and preset standard gas is in error allowed band, if so, the then laser radar
Measurement result is accurate.
7. device according to claim 6, it is characterised in that the laser beam treatment module, specifically for by described
One laser beam is focused processing；
The optical fiber, specifically for the angle of divergence of the first laser beam after adjustment focusing；
The collimation lens, after to the first laser Shu Jinhang collimations after the optical fiber adjusts the angle of divergence
Project to the calibrating gas pond.
8. device according to claim 6, it is characterised in that the calibrating gas pond, specifically for described second is swashed
Light beam is exported to the collimation lens；
The collimation lens, specifically for being collimated to the second laser Shu Jinhang reflected by calibrating gas pond；
The optical fiber, the angle of divergence specifically for adjusting the second laser beam after being collimated by the collimation lens；
The laser beam treatment module, at the second laser Shu Jinhang after the optical fiber adjusts the angle of divergence
Reason, and export to the laser radar.
9. according to any described devices of claim 6-8, it is characterised in that the laser beam treatment module includes：Focus on saturating
Mirror, plane mirror, concave mirror, wherein distance is less than 1 meter between the plane mirror and the concave mirror；
The optical axis of the condenser lens, the plane mirror and the concave mirror on the same line, and the first laser
After beam passes sequentially through the condenser lens, the plane mirror and concave mirror processing, project to the optical fiber；
The second laser beam after being handled by the concave mirror scattering, is exported to the laser thunder after optical fiber injection
Reach.
10. device according to claim 9, it is characterised in that
The condenser lens, specifically for the first laser beam is focused；
The plane mirror, projected specifically for the first laser beam after focusing by its centre bore to the concave mirror
Centre bore, will pass through the entrance that the centre bore of the concave mirror enters the light.
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