CN217467161U - Ozone laser radar transmitting system for isolating return light - Google Patents
Ozone laser radar transmitting system for isolating return light Download PDFInfo
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- CN217467161U CN217467161U CN202220988198.9U CN202220988198U CN217467161U CN 217467161 U CN217467161 U CN 217467161U CN 202220988198 U CN202220988198 U CN 202220988198U CN 217467161 U CN217467161 U CN 217467161U
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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 of isolation return light. The ozone laser radar transmitting system for isolating the return light comprises a laser transmitter, 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; the isolator is arranged between the laser transmitter and the wavelength converter and is used for isolating return light emitted to the laser transmitter. The utility model provides an keep apart ozone laser radar transmitting system of light return has realized the isolation to the light return through set up the isolator between laser emitter and wavelength converter, has avoided the damage of light return to laser emitter, in addition the utility model provides a radar transmitting system constitutes simply, can effectively reduce the length of light path.
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 of isolation return light.
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 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 the ozone to 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 transmitting system based on a solid laser as a Raman pump source is easy to damage a lens due to the fact that the laser is short in wavelength (ultraviolet wavelength is 266nm) and high in energy. Especially, in order to improve the efficiency of the laser source when pumping the gas raman tube, the laser source is usually focused by using the focusing lens, the focused return light is easy to appear in the light path, and the return light is very easy to damage the laser when the focal length of the focusing lens is not properly selected or the position of the focusing lens is not properly placed. In some cases, in order to avoid the influence of the return focus on the laser, the length of the optical path is increased, so that the optical path structure is larger, and the whole equipment is larger.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides an keep apart ozone laser radar transmitting system of light return aims at overcoming the problem that exists among the prior art.
In order to achieve the above object, the utility model provides an keep apart ozone laser radar transmitting system of return light, this system 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; the isolator is arranged between the laser transmitter and the wavelength converter and is used for isolating return light emitted to the laser transmitter. The utility model provides an keep apart ozone laser radar transmitting system of light return has realized the isolation to the light return through set up the isolator between laser emitter and wavelength converter, has avoided the damage of light return to laser emitter, in addition the utility model provides a radar transmitting system constitutes simply, can effectively reduce the length of light path.
Optionally, the isolator 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 utility model discloses a change the polarization direction of returning light and make it can realize the effective isolation to returning the light with the polarization direction difference of polarization beam splitting piece to the isolator only comprises polarization beam splitting piece and quarter wave plate, its simple structure, easily realization.
Optionally, the ozone lidar transmitting system for isolating return light further comprises: the first diaphragm is arranged between the laser transmitter and the polarization beam splitting sheet. The utility model discloses a set up its aim at of diaphragm and realize rationally restricting the laser beam in laser emitter's light-emitting side.
Optionally, the ozone lidar transmitting system for isolating return light further 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 ozone lidar transmission system for isolating return light 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 ozone lidar transmitting system for isolating return light further comprises: and the beam expander is used for expanding the laser beams with the original wavelengths and the laser beams with the target wavelengths and then emitting the expanded laser beams into the atmosphere. The utility model discloses an adopt its purpose main in of beam expander, the diameter of extension target wavelength's laser beam to and reduce target wavelength's laser beam's divergence angle, more be favorable to remote detection.
Optionally, the ozone lidar transmitting system for isolating return light further comprises: the second plano-convex lens is arranged between the wavelength converter and the beam expander and is used for collimating the laser beams with the original wavelength and the laser beams with the target wavelength in a divergent state into parallel laser beams.
Optionally, the ozone lidar transmission system for isolating return light further comprises: a third mirror and a fourth mirror disposed between the wavelength converter and the second plano-convex lens. The utility model discloses an adopt the collocation of third speculum and fourth speculum, can further reduce the light path and reduce ozone laser radar transmitting system's volume.
Optionally, the laser emitting device comprises a laser for emitting a laser beam with an original wavelength of 266 nm; the wavelength converter comprises a Raman tube, and the laser beams with the original wavelengths pass through the Raman tube and then respectively generate laser beams with two target wavelengths, wherein the target wavelengths are 287nm and 299 nm. The utility model has the advantages of mature technology and easy realization by adopting the laser; in addition, a 266nm laser is used for pumping the Raman tube to generate laser beams with the wavelengths of 287nm and 299nm, and the method for generating the Raman laser is direct, simple, reliable and safe.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention of an ozone lidar transmission system with isolation of return light;
in the figure, 1-laser emitter, 2-first diaphragm, 3-polarization beam splitting sheet, 4-quarter wave plate, 5-first plano-convex lens, 6-first reflector, 7-second diaphragm, 8-second reflector, 9-wavelength converter, 10-third reflector, 11-fourth reflector, 12-second plano-convex lens, 13-beam expander and 14-atmosphere.
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 merely illustrative 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, an embodiment of the present invention provides an ozone lidar transmitting system for isolating return light, including: a laser transmitter 1, wherein the laser transmitter 1 is used for transmitting a laser beam with an original wavelength; in the present embodiment, the laser emitter 1 may be any device capable of emitting a laser beam, which can include, but is not limited to, a laser for emitting a laser beam with an original wavelength of 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 ozone lidar emitting system for isolating return light further comprises a wavelength converter 9, wherein the wavelength converter 9 is used for converting the laser beam with the original wavelength into a laser beam with a target wavelength; the wavelength converter 9 includes a raman tube, and a part of the laser beams with the original wavelength respectively generate two laser beams with target wavelengths after passing through the raman tube, wherein the target wavelengths are 287nm and 299nm respectively. In addition, a 266nm laser is used for pumping the Raman tube to generate laser beams with the wavelengths of 287nm and 299nm, and the method for generating the Raman laser is direct, simple, reliable and safe.
In this embodiment, the isolator of the ozone lidar transmitting system for isolating the return light is disposed between the laser transmitter 1 and the wavelength converter 9, and the isolator is used for isolating the return light emitted to the laser transmitter 1. The utility model provides an keep apart ozone laser radar transmitting system of return light has realized the isolation to the return light through set up the isolator between laser emitter 1 and wavelength converter 9, has avoided the return light to laser emitter 1's damage, in addition the utility model provides a radar transmitting system constitutes simply, can effectively reduce the length of light path.
In this embodiment, the isolator includes: the polarization beam splitting sheet 3 is arranged on the light emitting side of the laser transmitter 1, and the polarization direction of the polarization beam splitting sheet 3 is the same as that of the laser beam with the original wavelength; the quarter wave plate 4 is arranged on one side of the polarization beam splitting plate 3, which is far away from the laser transmitter 1, and the quarter wave plate 4 is 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 3. The utility model discloses a change the polarization direction of returning light and make it can realize the effective isolation to returning light with polarization beam splitting piece 3's polarization direction difference to the isolator only comprises polarization beam splitting piece 3 and quarter wave plate 4, its simple structure, easily realization.
In practical applications, the laser beam emitted from the laser emitter 1 with the original wavelength may be linearly polarized and have a fixed polarization direction, which may be a horizontal direction in this embodiment, or a vertical direction in one or some other embodiments. The utility model can put the polarization beam splitting piece 3 at the proper position on the light-emitting side light path of the laser transmitter 1, 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 piece 3, thereby leading the laser beam with the original wavelength to pass through efficiently; while the direction perpendicular to the polarization direction of the laser beam of the original wavelength will be reflected; the linearly polarized laser beam with the original wavelength passes through the quarter-wave plate 4 with a proper angle and then is changed into circularly polarized light, namely, the light beams transmitted behind are circularly polarized light, once the laser beam is influenced by a subsequent light path to generate return light, the polarization direction of the return light after passing through the quarter-wave plate 4 is vertical to the polarization direction of the laser, and therefore the return light is reflected to other directions by the polarization beam splitter plate 3. The simple isolator well ensures the outgoing of light and reflects the return light to the other direction through the separation of polarized light and the control of the polarization direction of laser light, thereby avoiding the influence of the return light on the laser; this is simpler and cheaper in terms of cost than the construction using optically active separators; in addition, the device is easy to select the type with higher damage threshold, and reduces the possibility of damage.
In an optional embodiment, the ozone lidar transmission system for isolating return light further comprises: the first diaphragm 2 is arranged between the laser emitter 1 and the polarization beam splitting plate 3, and the first diaphragm 2 is arranged between the laser emitter 1 and the polarization beam splitting plate 3. The utility model discloses a set up its aim at of diaphragm and realize rationally restricting the laser beam in laser emitter 1's light-emitting side. Furthermore, the first diaphragm 2 can be any type and model of diaphragm, and the specific choice can be selected according to the actual use situation, which will not be described in detail herein.
In an optional embodiment, the ozone lidar transmission system for isolating return light further comprises: the first plano-convex lens 5 is arranged on one side, far away from the polarization beam splitting plate 3, of the quarter-wave plate 4, and the first plano-convex lens 5 is 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 5 and come to focus on the laser beam of original wavelength, can focus on the center of wavelength converter 9 with the laser beam, more be favorable to realizing the conversion of wavelength. When the first plano-convex lens 5 is selected, the following requirements are satisfied: 1. the requirements of Raman conversion are met, and selection is carried out according to actual laser parameters and Raman tube selection; 2. the size and the placement position of the laser are both considered, the laser is ensured to be within the focal length range of the lens, and the return light is prevented from forming a real focus through the focusing lens to the inside of the laser, so that the damage to the laser is avoided; this also makes the overall optical path structure more compact.
In an optional embodiment, the ozone lidar transmission system for isolating return light further comprises: the device comprises a first reflecting mirror 6, a second diaphragm 7 and a second reflecting mirror 8, wherein the first reflecting mirror 6, the second diaphragm 7 and the second reflecting mirror 8 are respectively arranged between the first plano-convex lens 5 and the wavelength converter 9. The utility model discloses an adopt the collocation of first speculum 6 and second speculum 8, can effectively reduce the light path and reduce ozone laser radar transmitting system's volume.
In an optional embodiment, the ozone lidar transmission system for isolating return light further comprises: and the beam expander 13 is used for expanding the laser beams with the original wavelength and the laser beams with the target wavelength (the laser beams with the wavelengths of 266nm, 287nm and 299 nm) and then emitting the expanded laser beams into the atmosphere 14. The utility model discloses an adopt the diameter of beam expanding lens 13 its purpose main points in, extension target wavelength's laser beam to and reduce target wavelength's laser beam's divergence angle, more be favorable to remote detection. Further, the beam expander 13 may adopt a triple beam expander 13, and it is ensured that the entrance pupil size of the beam expander matches the diameter of the laser beam of the incoming target wavelength; the utility model discloses an adopt beam expanding lens 13 not only is the efficiency in order to improve the collimation, has enlarged the size of laser beam moreover, more is favorable to reducing the energy density of laser.
In an optional embodiment, the ozone lidar transmission system for isolating return light further comprises: the second plano-convex lens 12 is disposed between the wavelength converter 9 and the beam expander 13, and the second plano-convex lens 12 is configured to collimate the laser beam with the original wavelength and the laser beam with the target wavelength in a divergent state into parallel laser beams. It should be noted that, reference may be made to the first plano-convex lens 5 for selecting the second plano-convex lens 12, and details are not described herein for brevity.
In an alternative embodiment, the ozone lidar transmission system that isolates the return light further comprises: a third mirror 10 and a fourth mirror 11, the third mirror 10 and the fourth mirror 11 being disposed between the wavelength converter 9 and the second plano-convex lens 12. The utility model discloses an adopt the collocation of third speculum 10 and fourth speculum 11, can further reduce the light path and reduce ozone laser radar transmitting system's volume. Please refer back to fig. 1, the utility model discloses an adopt the combination of first speculum 6, second speculum 8, third speculum 10 and fourth speculum 11 to make the whole light path of the ozone laser radar transmitting system who leaves the light back be the S type trend, can effectively reduce laser radar transmitting system' S volume through above-mentioned design.
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. An ozone lidar transmission system that isolates return light, 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;
the isolator is arranged between the laser transmitter and the wavelength converter and is used for isolating return light emitted to the laser transmitter.
2. The isolated return light ozone lidar transmission system of claim 1, wherein the isolator 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.
3. The return light isolation ozone lidar transmission system of claim 2, further comprising:
the first diaphragm is arranged between the laser transmitter and the polarization beam splitting sheet.
4. The return-light isolated ozone lidar transmission system of claim 3, further comprising:
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 return-light isolated ozone lidar transmission system of claim 4, further comprising:
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 return-light isolated ozone lidar transmission system of claim 1, further comprising:
and the beam expander is used for expanding the laser beams with the original wavelengths and the laser beams with the target wavelengths and then emitting the expanded laser beams into the atmosphere.
7. The return-light isolated ozone lidar transmission system of claim 6, further comprising:
the second plano-convex lens is arranged between the wavelength converter and the beam expander and is used for collimating the laser beams with the original wavelength and the laser beams with the target wavelength in a divergent state into parallel laser beams.
8. The return-light isolated ozone lidar transmission system of claim 7, further comprising:
a third mirror and a fourth mirror disposed between the wavelength converter and the second plano-convex lens.
9. The ozone lidar transmission system for isolating return light of claim 1, wherein:
the laser transmitter comprises a laser for transmitting a laser beam with an original wavelength of 266 nm;
the wavelength converter comprises a Raman tube, and the laser beams with the original wavelengths pass through the Raman tube and then respectively generate laser beams with two target wavelengths, wherein the target wavelengths are 287nm and 299 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220988198.9U CN217467161U (en) | 2022-04-26 | 2022-04-26 | Ozone laser radar transmitting system for isolating return light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220988198.9U CN217467161U (en) | 2022-04-26 | 2022-04-26 | Ozone laser radar transmitting system for isolating return light |
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| Publication Number | Publication Date |
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| CN217467161U true CN217467161U (en) | 2022-09-20 |
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| CN202220988198.9U Active CN217467161U (en) | 2022-04-26 | 2022-04-26 | Ozone laser radar transmitting system for isolating return light |
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