CN114675299A - Front-end beam-expanding ozone laser radar transmitting system and laser transmitting method - Google Patents
Front-end beam-expanding ozone laser radar transmitting system and laser transmitting method Download PDFInfo
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- CN114675299A CN114675299A CN202210445854.5A CN202210445854A CN114675299A CN 114675299 A CN114675299 A CN 114675299A CN 202210445854 A CN202210445854 A CN 202210445854A CN 114675299 A CN114675299 A CN 114675299A
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 18
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- 239000005436 troposphere Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
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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
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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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
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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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
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention relates to the field of atmospheric ozone detection, in particular to an ozone laser radar transmitting system with expanded front end and a laser transmitting method. The system mainly comprises a laser transmitter, a laser processing unit and a control unit, wherein the laser transmitter is used for transmitting a laser beam with an original wavelength; a wavelength converter for converting the laser beam of the original wavelength into a laser beam of a target wavelength; a first optical lens group disposed between the laser emitter and the wavelength converter; the laser device comprises a first beam expanding device, wherein one end of the first beam expanding device is positioned on the light outlet side of the laser transmitter, the other end of the first beam expanding device is positioned on the light inlet side of the first optical lens group, and the first beam expanding device is used for expanding the laser beam with the original wavelength to avoid the damage to the first optical lens group caused by the laser beam with the original wavelength.
Description
Technical Field
The invention relates to the field of atmospheric ozone detection, in particular to an ozone laser radar transmitting system with expanded front end and a laser transmitting method.
Background
Although ozone plays an important role in protecting human and environment in the stratosphere, if the concentration of ozone in the troposphere is increased, the ozone can bring serious harm to human, animal and plant growth and ecological environment, and plays an important role in troposphere photochemistry, atmospheric environmental quality and ecological environment. The differential absorption lidar technology is an effective means for detecting the distribution of atmospheric ozone due to the advantages of high space resolution, rapidness, real-time performance, large dynamic range and the like.
At present, a high-energy ultraviolet solid laser is generally used for emitting laser light source, and gas (such as hydrogen, deuterium and CO) is pumped after being focused by a focusing lens2) A Raman tube to generate corresponding Raman laser light of different wavelengths. The Raman laser and the laser light source are emitted into the atmosphere after being collimated and expanded, are scattered and absorbed by particles in the atmosphere after being attenuated by the atmosphere, and form differential absorption by utilizing different absorption degrees of ozone on the Raman laser with different wavelengths; after the scattering and absorption of atmospheric particles and ozone, the backscattered laser is subjected to atmospheric extinction again in the returning path, then is received by a receiving optical system, is subjected to photoelectric conversion by a photoelectric detector, and finally is used for collecting echo signals, so that ozone concentration spatial distribution information can be obtained by using a differential absorption algorithm.
An ozone radar emission system based on a solid laser as a Raman pump source is easy to damage a lens coating film due to the fact that the laser is short in wavelength (ultraviolet wavelength is 266nm) and photon energy is higher than that of long wavelength. The laser beam emitted by the laser is generally small in diameter (about 5-8 mm), and the energy density is high due to the fact that the single pulse energy of the laser is high; the laser of such high-energy ultraviolet laser is not a fundamental mode beam, and because the actual energy density of the mode distribution is usually higher than that predicted by theory, these factors are easy to damage the lens, especially the reflector.
In practical application, the damage of the lens is most easily generated on the optical path part from the laser to the front end of the Raman tube, because the laser of the optical path part is directly emitted from the laser, the beam diameter is small, the energy density is high, and the damage threshold of the lens is limited; in addition, in order to improve the conversion efficiency of the laser in the Raman tube, a focusing lens is required to be used for focusing the laser beam in the process, the diameter of the beam is smaller and smaller when the beam is transmitted in the part, the energy density is higher, the pressure on the lens is higher, and the lens along the way is easier to damage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an ozone laser radar transmitting system with expanded front end and a laser transmitting method, aiming at overcoming the problems in the prior art.
In order to achieve the above object, in a first aspect, the present invention provides a front-end beam-expanding ozone lidar transmission system, comprising: a laser transmitter for transmitting a laser beam at an original wavelength; a wavelength converter for converting the laser beam of the original wavelength into a laser beam of a target wavelength; a first optical lens group disposed between the laser emitter and the wavelength converter; the laser device comprises a first beam expanding device, wherein one end of the first beam expanding device is positioned on the light outlet side of the laser transmitter, the other end of the first beam expanding device is positioned on the light inlet side of the first optical lens group, and the first beam expanding device is used for expanding the laser beam with the original wavelength to avoid the damage to the first optical lens group caused by the laser beam with the original wavelength. According to the ozone laser radar transmitting system with the front end expanded beams, the first expanded beam device is arranged to reduce the energy of the laser beams emitted by the laser emitter, so that an optical lens group between the laser emitter and the wavelength converter can be effectively prevented from being damaged, and the normal work of the ozone laser radar transmitting system with the front end expanded beams is guaranteed.
Optionally, the front-end beam-expanded ozone lidar transmitting system further comprises: one end of the second optical lens group is located on the light emitting side of the laser emitter, the other end of the second optical lens group is located on the light incident side of the first beam expanding device, and the second optical lens group is used for isolating return light emitted to the laser emitter. According to the invention, the second optical lens group is arranged between the laser emitter and the wavelength converter, so that the isolation of return light is realized, and the damage of the return light to the laser emitter is avoided.
Optionally, the second optical lens group comprises: the first diaphragm is arranged between the laser transmitter and the polarization beam splitting sheet; the polarization beam splitting sheet is arranged on the light emergent side of the laser transmitter, and the polarization direction of the polarization beam splitting sheet is the same as that of the laser beam with the original wavelength; the quarter wave plate is arranged on one side, far away from the laser transmitter, of the polarization beam splitting plate and used for changing the polarization direction of the returned light, so that the polarization direction of the returned light is different from that of the polarization beam splitting plate. The invention can realize effective isolation of the return light by changing the polarization direction of the return light to be different from that of the polarization beam splitting plate.
Optionally, the first optical lens group comprises: the first plano-convex lens is arranged on one side, far away from the polarization beam splitting plate, of the quarter-wave plate and used for focusing the laser beams with the original wavelengths to form focused laser beams. The laser beam with the original wavelength is focused by arranging the first plano-convex lens, so that the laser beam can be focused to the center of the wavelength converter, and the wavelength conversion is more favorably realized.
Optionally, the first optical lens group further comprises: the first reflector, the second diaphragm and the second reflector are respectively arranged between the first plano-convex lens and the wavelength converter. The invention can effectively reduce the light path and the volume of the ozone laser radar transmitting system by adopting the matching of the first reflector and the second reflector.
Optionally, the front-end beam-expanded ozone lidar transmitting system further comprises: the sealed bin is used for accommodating all the components of the ozone laser radar transmitting system with the front end expanded beam; and the third optical lens group is arranged on the light-emitting side of the wavelength converter. According to the invention, the sealed bin is arranged and the structural material which is not influenced by ultraviolet light is adopted, so that the influence of dust or light-induced pollutants on the lens is avoided.
Optionally, the third optical lens group comprises a second plano-convex lens, a first mirror and a second mirror; the second plano-convex lens, the first reflector and the second reflector are sequentially arranged in the direction of the light-emitting side far away from the wavelength converter. The laser beam with the target wavelength in the divergent state is directly collimated by the second plano-convex lens after coming out, and the focal length of the second plano-convex lens is smaller than that of the first plano-convex lens, so that the size of the collimated laser beam is reduced.
Optionally, the front-end beam-expanded ozone lidar transmitting system comprises: and the second beam expanding device is arranged on the light emergent side of the second reflector. The entrance pupil size of the second beam expander is matched with the laser beam collimated by the second plano-convex lens. By adopting the configuration mode, the required laser emitter has a small spot size, or is used when the multiple of the first beam expanding device is not too high; the laser beam expander has the advantages that the second beam expander is more convenient to adjust, the divergence angle of a laser beam is easy to control, the dispersion difference among different wavelengths is small, and the control structure and the adjusting step of the beam expander are relatively simple.
Optionally, the third optical lens group comprises a first mirror, a second mirror and a second plano-convex lens; the first reflector, the second reflector and the second plano-convex lens are sequentially arranged on the light-emitting side far away from the wavelength converter. The laser beam in the divergent state from the wavelength converter passes through the first reflector and the second reflector, is re-collimated into parallel light by the second plano-convex lens, and is directly emitted into the atmosphere. The configuration mode has the advantages that the second plano-convex lens is used as the collimating lens, the energy of the laser beam of the wavelength converter can be utilized to the maximum extent, the energy is not easily blocked by a receiving part and lost, the detection efficiency is greatly improved, and the light path is simplified.
In a second aspect, based on the same inventive concept, the present invention also provides a laser emission method, including: providing a front-end beam expanded ozone lidar transmission system as described in the first aspect of the invention; and transmitting a laser beam with a target wavelength to the atmosphere by using the ozone laser radar transmitting system with the front end expanded beam. The laser emission method mainly adopts the ozone laser radar emission system with the front-end beam expansion function, and particularly, the first beam expansion device is arranged between the laser emitter and the wavelength converter, so that the energy of laser beams emitted by the laser emitter is reduced, an optical lens group between the laser emitter and the wavelength converter can be effectively prevented from being damaged, and the normal work of the ozone laser radar emission system with the front-end beam expansion function is ensured.
Drawings
FIG. 1 is a first schematic diagram of an embodiment of a front-end beam-expanding ozone lidar transmission system of the present invention;
FIG. 2 is a second schematic diagram of an embodiment of a front-end beam-expanding ozone lidar transmission system of the present invention;
fig. 3 is a flowchart of an embodiment of a laser emission method of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known circuits, software, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale.
Referring to fig. 1 or fig. 2, an embodiment of the present invention provides a front-end beam-expanding ozone lidar transmitting system, including a laser transmitter configured to transmit a laser beam with an original wavelength. In this embodiment, the laser emitter may be any device that can emit a laser beam, which can include, but is not limited to, a laser for emitting a laser beam at an original wavelength, the original wavelength being 266 nm; the laser device has the advantages of mature technology and easy realization; it should be noted that the original wavelength may also be adjusted according to the actual detection scenario, and should not be limited to the cases listed herein.
In this embodiment, the front-end beam-expanding ozone lidar transmission system further includes a wavelength converter, and the wavelength converter is configured to convert the laser beam with the original wavelength into a laser beam with a target wavelength. Furthermore, the wavelength converter may be a raman tube, and a portion of the laser beam with the original wavelength passes through the raman tube to generate two laser beams with target wavelengths respectively, and the target wavesThe lengths are 287nm and 299nm, respectively. In addition, 266nm laser pumping Raman tube was used, and CO was used2The gas is focused and excited by 266nm laser to generate 287nm and 299nm Raman laser beams, and the method is simple and effective, the gas is non-toxic and the process does not produce pollution.
In this embodiment, the front-end beam-expanded ozone lidar transmitting system further includes a first optical lens group, and the first optical lens group is disposed between the laser transmitter and the wavelength converter. The first optical lens group is mainly used for adjusting the laser beam with the original wavelength emitted by the laser emitter and transmitting the laser beam into the wavelength converter.
In this embodiment, the ozone laser radar transmitting system that the front end expanded beam still includes first beam expander, the one end of first beam expander is located laser emitter's light-emitting side, the other end of first beam expander is located the income light side of first optical lens group, first beam expander be used for with the laser beam of primitive wavelength expands the beam, avoids the laser beam of primitive wavelength is right first optical lens group causes the damage. According to the ozone laser radar transmitting system with the front end expanded beams, the first expanded beam device is arranged to reduce the energy of the laser beams emitted by the laser emitter, so that an optical lens group between the laser emitter and the wavelength converter can be effectively prevented from being damaged, and the normal work of the ozone laser radar transmitting system with the front end expanded beams is guaranteed.
In an optional embodiment, the front-end beam-expanding ozone lidar transmitting system further includes a second optical lens group, one end of the second optical lens group is located on the light-emitting side of the laser emitter, the other end of the second optical lens group is located on the light-entering side of the first beam-expanding device, and the second optical lens group is used for isolating return light emitted to the laser emitter. According to the invention, the second optical lens group is arranged between the laser emitter and the wavelength converter, so that the isolation of return light is realized, and the damage of the return light to the laser emitter is avoided.
In an alternative embodiment, the second optical lens group includes a first stop disposed between the laser emitter and the polarization beam splitter; the first diaphragm mainly has the function of blocking part of return light in the light path, and can prevent other scattered light from propagating in the emission light path while reducing the return light. The second optical lens group further comprises a polarization beam splitting sheet, the polarization beam splitting sheet is arranged on the light emergent side of the laser emitter, and the polarization direction of the polarization beam splitting sheet is the same as that of the laser beam with the original wavelength; the second optical lens group further comprises a quarter-wave plate, the quarter-wave plate is arranged on one side, far away from the laser emitter, of the polarization beam splitting plate, and the quarter-wave plate is used for changing the polarization direction of the returned light, so that the polarization direction of the returned light is different from that of the polarization beam splitting plate. The invention can realize effective isolation of the return light by changing the polarization direction of the return light to be different from that of the polarization beam splitting plate. The polarization beam splitting plate can be placed at a proper position on the light-emitting side light path of the laser transmitter, and the polarization direction of the laser beam with the original wavelength is ensured to correspond to the laser polarization direction of the polarization beam splitting plate, so that the laser beam with the original wavelength can efficiently pass through the polarization beam splitting plate; while the direction perpendicular to the polarization direction of the laser beam of the original wavelength will be reflected; the laser beam with the linear polarization original wavelength is changed into circular polarization light after passing through the quarter-wave plate with a proper angle, namely, the light beams transmitted behind are circular polarization light, once the laser beam generates return light under the influence of a subsequent light path, the polarization direction of the return light after passing through the quarter-wave plate is vertical to the polarization direction of the laser light, and therefore the return light is reflected to other directions by the polarization beam splitting plate. Through the simple configuration, the separation of polarized light and the control of the polarization direction of laser are realized, the outgoing light is well ensured, and the return light is reflected to the other direction, so that the influence of the return light on the laser is avoided; this is simpler and cheaper in terms of cost than the isolation structure using optical rotation; in addition, the device is easy to select the type with higher damage threshold, and reduces the possibility of damage.
In an alternative embodiment, the first optical lens group comprises: the first plano-convex lens is arranged on one side, far away from the polarization beam splitting plate, of the quarter-wave plate and used for focusing the laser beams with the original wavelengths to form focused laser beams. The laser beam with the original wavelength is focused by arranging the first plano-convex lens, so that the laser beam can be focused to the center of the wavelength converter, and the wavelength conversion is more favorably realized. Wherein, first plano-convex lens is the demand that will satisfy the wavelength converter conversion, second will compromise laser emitter's size and locating place, guarantees that laser emitter in the focus within range of first plano-convex lens, avoids the return light to form inside real focus to laser emitter through this first plano-convex lens to laser emitter's damage has been avoided.
In an alternative embodiment, the first optical lens group further comprises: the first reflector, the second diaphragm and the second reflector are respectively arranged between the first plano-convex lens and the wavelength converter. The invention can effectively reduce the light path and the volume of the ozone laser radar transmitting system by adopting the matching of the first reflector and the second reflector. Furthermore, the second diaphragm mainly blocks part of return light in the optical path, and can prevent other scattered light from propagating in the emission optical path while reducing the return light. Furthermore, the size of the first reflector and the second reflector may be alternatively larger, for example, the size in the prior art is usually 1 inch, and in this embodiment, the size may be changed to 1.5 or 2 inches, so as to match the size of the expanded laser beam, thereby not only avoiding the laser beam from overflowing, but also avoiding the laser from being incident on the frame or other parts, which causes more scattering or contamination.
In an optional embodiment, the front-end expanded-beam ozone lidar transmission system further comprises: the sealed bin is used for accommodating all the components of the ozone laser radar transmitting system with the front end expanded beam; and the third optical lens group is arranged on the light-emitting side of the wavelength converter. Furthermore, the light path of the invention is sealed in the form of a sealed chamber, and the inside of the sealed chamber can be used with materials which are not affected by ultraviolet light or surface treatment is carried out, such as Teflon materials, or Teflon films are pasted inside the sealed chamber; dust or other pollution in the air can be effectively prevented.
In an alternative embodiment, the third optical lens group includes a second plano-convex lens, a first mirror, and a second mirror; the second plano-convex lens, the first reflector and the second reflector are sequentially arranged on the light-emitting side far away from the wavelength converter. The laser beam with the target wavelength in the divergent state is directly collimated by the second plano-convex lens after coming out, and the focal length of the second plano-convex lens is smaller than that of the first plano-convex lens, so that the size of the collimated laser beam is reduced.
Referring back to fig. 1, based on the above embodiment, the front-end beam-expanding ozone lidar transmitting system further includes: and the second beam expanding device is arranged on the light emergent side of the second reflector. The entrance pupil size of the second beam expander is matched with the laser beam collimated by the second plano-convex lens. By adopting the configuration mode, the required laser emitter has a small spot size, or is used when the multiple of the first beam expanding device is not too high; the laser beam expander has the advantages that the second beam expander is more convenient to adjust, the divergence angle of a laser beam is easy to control, the dispersion difference among different wavelengths is small, and the control structure and the adjusting step of the beam expander are relatively simple. It should be noted that, since the second beam expander is disposed at the front end, the size of the laser beam becomes larger, and therefore, the aperture size of the second diaphragm should match with that.
Referring back to fig. 2, in another alternative embodiment, the third optical lens group includes: the first reflector, the second reflector and the second plano-convex lens; the first reflector, the second reflector and the second plano-convex lens are sequentially arranged on the light-emitting side far away from the wavelength converter. The laser beam in a divergent state from the wavelength converter passes through the first reflector and the second reflector, is re-collimated into parallel light by the second plano-convex lens, and is directly emitted into the atmosphere. The configuration mode has the advantages that the second plano-convex lens is used as the collimating lens, the energy of the laser beam of the wavelength converter can be utilized to the maximum extent, the energy is not easily blocked by a receiving part and lost, the detection efficiency is greatly improved, and the light path is simplified.
In an alternative embodiment, all the materials of the lens holder and the diaphragm in the front-end beam-expanding ozone lidar emitting system of the invention are selected to be materials which are not affected by ultraviolet light. The reason is that the surfaces of some optical frames are oxidized, and when the surfaces are irradiated by ultraviolet intense laser, the surfaces are easy to be ionized and gasified to generate pollutants, and the pollutants are easy to attach to the surfaces of the lenses, so that the damage threshold of the lenses is greatly reduced, and the lenses are easy to be damaged by intense light. Therefore, the spectacle frame can be made of stainless steel or aluminum alloy without oxidation treatment, and if the spectacle frame is simple, the spectacle frame can also be made of Teflon material, so that lens damage caused by light-induced pollution can be avoided as far as possible.
Referring to fig. 3, an embodiment of the present invention further provides a laser emission method, including:
s1, providing a front-end expanded-beam ozone lidar transmission system as described in the first aspect of the present invention;
and S2, emitting laser beams with target wavelengths to the atmosphere by using the ozone laser radar emitting system with the front end expanded beams.
In this embodiment, the front-end expanded ozone lidar transmitting system is as described in the related embodiments of the front-end expanded ozone lidar transmitting system of the present invention. The laser transmitting method mainly adopts the ozone laser radar transmitting system with the front-end beam expanding function, and particularly, the first beam expanding device is arranged between the laser transmitter and the wavelength converter, so that the energy of a laser beam emitted by the laser transmitter is reduced, an optical lens group between the laser transmitter and the wavelength converter can be effectively prevented from being damaged, and the normal work of the ozone laser radar transmitting system with the front-end beam expanding function is further ensured. The specific system components and advantages of the front-end beam-expanding ozone lidar transmitting system can also be referred to in the foregoing, and will not be described in a repeated manner here.
In addition, the laser emitting method can also be applied to the field of detection of ozone distribution; the method also comprises the step of receiving echo signals obtained by backscattering laser beams with three wavelengths of 266nm, 287nm and 299nm through an atmosphere layer when detecting the distribution of the ozone, and further, a telescope can be adopted when receiving the echo signals. It should be noted that other steps and detailed calculation methods related to the method for detecting ozone distribution, which are not involved in the present invention, are not the core points of the present invention, and therefore are not described in the application document, and reference may be made to the existing differential absorption lidar detection technology.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. The utility model provides an ozone laser radar transmitting system that front end expanded beam which characterized in that includes:
a laser transmitter for transmitting a laser beam at an original wavelength;
a wavelength converter for converting the laser beam of the original wavelength into a laser beam of a target wavelength;
a first optical lens group disposed between the laser emitter and the wavelength converter;
the laser device comprises a first beam expanding device, wherein one end of the first beam expanding device is positioned on the light outlet side of the laser transmitter, the other end of the first beam expanding device is positioned on the light inlet side of the first optical lens group, and the first beam expanding device is used for expanding the laser beam with the original wavelength to avoid the damage to the first optical lens group caused by the laser beam with the original wavelength.
2. The front-end expanded-beam ozone lidar transmission system of claim 1, further comprising:
and one end of the second optical lens group is positioned on the light-emitting side of the laser emitter, the other end of the second optical lens group is positioned on the light-entering side of the first beam expanding device, and the second optical lens group is used for isolating return light emitted to the laser emitter.
3. The front-end expanded-beam ozone lidar transmission system of claim 2, wherein the second optical lens group comprises:
the polarization beam splitting sheet is arranged on the light emergent side of the laser transmitter, and the polarization direction of the polarization beam splitting sheet is the same as that of the laser beam with the original wavelength;
the quarter wave plate is arranged on one side, far away from the laser transmitter, of the polarization beam splitting plate and used for changing the polarization direction of the returned light, so that the polarization direction of the returned light is different from that of the polarization beam splitting plate;
the first diaphragm is arranged between the laser transmitter and the polarization beam splitting sheet.
4. The front-end expanded-beam ozone lidar transmission system of claim 3, wherein the first optical lens group comprises:
the first plano-convex lens is arranged on one side, far away from the polarization beam splitting plate, of the quarter-wave plate and used for focusing the laser beams with the original wavelengths to form focused laser beams.
5. The front-end expanded-beam ozone lidar transmission system of claim 4, wherein the first optical lens group further comprises:
the first reflector, the second diaphragm and the second reflector are respectively arranged between the first plano-convex lens and the wavelength converter.
6. The front-end expanded-beam ozone lidar transmission system of claim 1, further comprising:
the sealed bin is used for accommodating all the components of the ozone laser radar transmitting system with the front end expanded beam;
and the third optical lens group is arranged on the light-emitting side of the wavelength converter.
7. The front-end expanded-beam ozone lidar transmission system of claim 6, wherein the third optical lens group comprises a second plano-convex lens, a first mirror, and a second mirror;
the second plano-convex lens, the first reflector and the second reflector are sequentially arranged on the light-emitting side far away from the wavelength converter.
8. The front-end expanded-beam ozone lidar transmission system of claim 7, wherein the front-end expanded-beam ozone lidar transmission system comprises:
and the second beam expanding device is arranged on the light-emitting side of the second reflector.
9. The front-end expanded-beam ozone lidar transmission system of claim 6, wherein the third optical lens group comprises a first mirror, a second mirror, and a second plano-convex lens;
the first reflector, the second reflector and the second plano-convex lens are sequentially arranged on the light-emitting side far away from the wavelength converter.
10. A laser emission method, comprising:
providing a front-end expanded ozone lidar transmission system as recited in any of claims 1-8;
and emitting laser beams with target wavelengths to the atmosphere by using the ozone laser radar emitting system with the front end expanded beam.
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