CN217443542U - Ozone laser radar transmitting system with front end expanded beam - Google Patents
Ozone laser radar transmitting system with front end expanded beam Download PDFInfo
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- CN217443542U CN217443542U CN202220988235.6U CN202220988235U CN217443542U CN 217443542 U CN217443542 U CN 217443542U CN 202220988235 U CN202220988235 U CN 202220988235U CN 217443542 U CN217443542 U CN 217443542U
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Abstract
The utility model belongs to the technical field of the atmosphere ozone detection and specifically relates to an ozone laser radar transmitting system that front end expanded beam. 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; first beam expander, first beam expander's one end is located laser emitter's light-emitting side, first beam expander's the other end is located the income light side of first optical lens group, first beam expander be used for with the laser beam of original wavelength expands the beam, avoids the laser beam of original wavelength is right first optical lens group causes the damage.
Description
Technical Field
The utility model belongs to the technical field of the atmosphere ozone detection and specifically relates to an ozone laser radar transmitting system that front end expanded beam.
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 laser radar technology becomes an effective means for detecting the distribution of atmospheric ozone due to the advantages of high spatial resolution, rapidness, real-time performance, large dynamic range and the like.
At present, a high-energy ultraviolet solid laser is generally used for emitting a laser light source, and gas (such as hydrogen, deuterium and CO) is pumped after being focused by a focusing lens 2 ) 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 back-scattered laser is again delustred by atmosphere 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 signalsThe differential absorption algorithm can obtain ozone concentration spatial distribution information.
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.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides an ozone laser radar transmitting system that the front end expanded the beam aims at overcoming the problem that exists among the prior art.
In order to realize the above purpose, the utility model provides an ozone laser radar transmitting system that front end expanded beam, include: 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. The utility model provides an ozone laser radar transmitting system that front end expanded beam through setting up the energy of first beam expanding device in order to reduce the laser beam that laser emitter sent, can effectively avoid damaging the optics battery of lens between laser emitter and the wavelength converter, and then guarantees the normal work of the ozone laser radar transmitting system that the front end expanded beam.
Optionally, the front-end beam-expanded ozone lidar transmitting system further comprises: 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. The utility model discloses a set up second optics battery of lens between laser emitter and wavelength converter, realized the isolation to the return light, avoided the damage of return light to laser emitter.
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 emitting 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 utility model discloses a change the polarization direction of returning light and make it different with the polarization direction of polarization beam splitting piece, can realize the effective isolation to returning the light.
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 utility model discloses a set up first plano-convex lens and come to focus on the laser beam of original wavelength, can focus on the center of wavelength converter with the laser beam, more be favorable to realizing the conversion of wavelength.
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 utility model discloses an adopt the collocation of first speculum and second mirror, can effectively reduce the light path and reduce ozone laser radar transmitting system's volume.
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. The utility model discloses a set up sealed storehouse and its structural material who has adopted not to be influenced by the ultraviolet ray, avoid the influence of dust or photoinduced pollutant to lens.
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 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.
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.
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;
figure 2 is the utility model discloses the ozone laser radar transmitting system embodiment's that the front end expanded beam schematic diagram two.
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 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 present 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, where the laser transmitter is 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 utility model has the advantages of mature technology and easy realization by adopting the laser; 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 transmitting 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 part of the laser beam with the original wavelength passes through the raman tube to generate two laser beams with target wavelengths, wherein the target wavelengths are 287nm and 299nm respectively. In addition, 266nm laser pumping Raman tube was used, and CO was used 2 The 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. The utility model provides an ozone laser radar transmitting system that front end expanded beam through setting up the energy of first beam expanding device in order to reduce the laser beam that laser emitter sent, can effectively avoid damaging the optics battery of lens between laser emitter and the wavelength converter, and then guarantees the normal work of the ozone laser radar transmitting system that the front end expanded beam.
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. The utility model discloses a set up second optics battery of lens between laser emitter and wavelength converter, realized the isolation to the return light, avoided the damage of return light to laser emitter.
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 utility model discloses a change the polarization direction of returning light and make it different with the polarization direction of polarization beam splitting piece, can realize the effective isolation to returning light. The utility model can put the polarization beam splitting sheet at the proper position on the light-emitting side light path of the laser transmitter, and ensure that the polarization direction of the laser beam with the original wavelength corresponds to the laser polarization direction of the polarization beam splitting sheet, thereby leading the laser beam with the original wavelength to pass through efficiently; the direction perpendicular to the polarization direction of the laser beam with the original wavelength is 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 includes: 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 utility model discloses a set up first plano-convex lens and come to focus on the laser beam of original wavelength, can focus on the center of wavelength converter with the laser beam, more be favorable to realizing the conversion of wavelength. 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 utility model discloses an adopt the collocation of first speculum and second speculum, can effectively reduce the light path and reduce ozone laser radar transmitting system's volume. Furthermore, the second diaphragm mainly blocks 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. 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 utility model is sealed in the form of a sealed cabin, and the inside of the sealed cabin can be used with materials which are not affected by ultraviolet light or surface treatment, such as Teflon materials or Teflon films attached inside; 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 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 an alternative embodiment, the front-end beam-expanding ozone lidar emitting system of the present invention includes all the lens holder and diaphragm materials that 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.
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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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 substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (9)
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 return light so that the polarization direction of the return 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 beam expanded 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 emergent side of the second reflector.
9. The front-end beam-expanding 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220988235.6U CN217443542U (en) | 2022-04-26 | 2022-04-26 | Ozone laser radar transmitting system with front end expanded beam |
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| CN202220988235.6U CN217443542U (en) | 2022-04-26 | 2022-04-26 | Ozone laser radar transmitting system with front end expanded beam |
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| CN217443542U true CN217443542U (en) | 2022-09-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675299A (en) * | 2022-04-26 | 2022-06-28 | 深圳大舜激光技术有限公司 | Front-end beam-expanding ozone laser radar transmitting system and laser transmitting method |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675299A (en) * | 2022-04-26 | 2022-06-28 | 深圳大舜激光技术有限公司 | Front-end beam-expanding ozone laser radar transmitting system and laser transmitting method |
| CN114675299B (en) * | 2022-04-26 | 2024-07-12 | 深圳大舜激光技术有限公司 | Front-end beam-expanding ozone laser radar transmitting system and laser transmitting method |
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