CN108226900B - Signal receiving system and ozone detection laser radar - Google Patents

Signal receiving system and ozone detection laser radar Download PDF

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Publication number
CN108226900B
CN108226900B CN201810094668.5A CN201810094668A CN108226900B CN 108226900 B CN108226900 B CN 108226900B CN 201810094668 A CN201810094668 A CN 201810094668A CN 108226900 B CN108226900 B CN 108226900B
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signal
optical fiber
rayleigh
raman
processing module
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CN108226900A (en
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方欣
李陶
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University of Science and Technology of China USTC
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University of Science and Technology of China USTC
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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
    • G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
    • 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
    • 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
    • G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The application discloses signal receiving system and ozone detection laser radar, signal receiving system utilizes beam combination optic fibre to realize the receipt to the ozone echo signal that a plurality of components of a whole that can function independently telescopes received to utilize follow-up light path to handle the ozone echo signal that beam combination optic fibre was transmitted in order to realize the conversion of light signal to the signal of telecommunication, need not to design numerous coupling light paths, photoelectric detector and collection system according to the quantity of single telescope in the combination telescope, realized reducing the cost of the receiving light path of combination telescope, improve the integrated level of receiving light path, and reduce the purpose of debugging degree of difficulty. In addition, the first signal processing module and the second signal processing module of the signal receiving system are symmetrically arranged about the central axis of the chopped optical disc, so that photoelectric conversion of the Rayleigh echo signal or the Raman echo signal can be realized by independently adjusting the light paths of the first signal processing module and the second signal processing module.

Description

Signal receiving system and ozone detection laser radar
Technical Field
The present application relates to the technical field of lidar systems, and more particularly, to a signal receiving system and an ozone detecting lidar.
Background
In recent decades, lidar has been rapidly developed in the field of atmospheric detection, particularly in China, the investment of scientific research costs has been increased, and the development of the atmospheric detection lidar is just like spring bamboo shoots after rain. In 2012, the national natural science foundation committee sponsors the research of national major scientific research instruments and equipment to be a special multi-band multi-atmosphere component active and passive comprehensive detection system, wherein a plurality of laser radar sub-projects such as an aerosol cloud laser radar, a Rayleigh sodium wind temperature laser radar, an ozone detection laser radar, a pollutant detection laser radar, a carbon dioxide laser radar and the like are included. The rayleigh sodium wind temperature laser radar and the ozone detection laser radar need to detect a troposphere and also need to detect middle-high-level atmosphere, so that the effective receiving area of the receiving telescope is very effective means for improving the detection height and the signal-to-noise ratio of the two laser radars.
However, the processing cost of the receiving telescope increases with the increase of the receiving area, so that the purpose of increasing the receiving area of the receiving telescope is generally achieved by adopting a plurality of small caliber telescopes as the combined telescope and simultaneously receiving the back scattering echo signals interacted by the same laser beam and the atmosphere.
In the prior art, the design of the subsequent receiving optical path of the combined telescope can be referred to without experience, and the traditional design thought of the subsequent receiving optical path of the receiving telescope in the ozone detection laser radar system is generally to set an independent receiving optical fiber, a set of coupling optical path, a set of photoelectric detector and a set of acquisition device in a matched manner for echo signals with single wavelength. However, for the ozone detection laser radar with the combined telescope, if the subsequent receiving light path of the combined telescope is still designed according to the traditional design thought, for echo signals with a single wavelength, the same number of receiving optical fibers, coupling light paths, photodetectors and acquisition devices as those of the single telescope in the combined telescope need to be designed, and for a plurality of receiving wavelengths, the number of at least the coupling light paths, the photodetectors and the acquisition devices also needs to be multiplied by the number of the detection wavelengths on the basis, so that the receiving light path of the designed combined telescope has huge cost, low integration level and difficult subsequent implementation and debugging.
Disclosure of Invention
In order to solve the technical problems, the application provides a signal receiving system and an ozone detection laser radar so as to achieve the purposes of reducing the cost of a receiving light path of a combined telescope, improving the integration level of the receiving light path and reducing the debugging difficulty.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a signal receiving system for use in an ozone detecting lidar, the signal receiving system comprising: the optical fiber combined telescope comprises a combined telescope body, a beam combining optical fiber, an achromatic module, a first signal processing module, a second signal processing module, a first signal conversion module, a second signal conversion module and a chopping disk; wherein,
the combined telescope comprises a plurality of split telescopes and is used for receiving the ozone echo signals of the ozone detection laser radar and transmitting the signals to the beam combining optical fibers;
the beam combining optical fibers comprise a plurality of optical fibers, one end of each optical fiber is arranged at the focal plane of one split telescope, and the beam combining optical fibers are used for receiving ozone echo signals transmitted by the combined telescope and transmitting the ozone echo signals to the achromatic module;
the achromatizing module is used for carrying out achromatizing, collimation and color separation processing on the ozone echo signals transmitted by the beam combining optical fiber so as to obtain Rayleigh echo signals and Raman echo signals which are respectively transmitted to the first signal processing module and the second signal processing module;
the first signal processing module and the second signal processing module are symmetrically arranged about the central axis of the chopped optical disc, and the first signal processing module is used for filtering and converging the Rayleigh echo signals to obtain Rayleigh light spots to be emitted to the chopped optical disc;
the second signal processing module is used for filtering and converging the Raman echo signals to obtain Raman light spots to be emitted to the chopped optical disc;
the chopping optical disc is used for respectively chopping the Rayleigh light spot and the Raman light spot to obtain a Rayleigh signal to be converted and a Raman signal to be converted;
the first signal conversion module is used for receiving the Rayleigh signal to be converted and obtaining Rayleigh electric signals after photoelectric conversion of the Rayleigh signal to be converted;
the second signal conversion module is used for receiving the Raman signal to be converted and obtaining a Raman electric signal after photoelectric conversion of the Raman signal to be converted.
Optionally, each of the optical fibers includes: a first optical fiber connector, a second optical fiber connector, and a transmission optical fiber connecting the first optical fiber connector and the second optical fiber connector; wherein,
the first optical fiber connector is arranged at the focal plane of one split telescope, and the second optical fiber connector is packaged with the second optical fiber connectors of other optical fibers of the beam combining optical fibers to be used as the beam combining connector of the beam combining optical fibers.
Optionally, the first optical fiber connector comprises an optical fiber core and a first packaging structure surrounding the optical fiber core;
the beam combining connector comprises a plurality of second optical fiber connectors and a second packaging structure surrounding the second optical fiber connectors;
the first packaging structure is a metal packaging structure or a plastic packaging structure;
the second packaging structure is a metal packaging structure or a plastic packaging structure.
Optionally, the achromatism module includes: an air gap achromatic lens group, a color separation film, and a first mirror, wherein,
the air gap achromatic lens group comprises a meniscus lens and a biconvex lens arranged on one side of the meniscus lens, which is away from the beam combining optical fiber, and is used for carrying out achromatism and collimation treatment on an ozone echo signal transmitted by the beam combining optical fiber;
the color separation film is used for reflecting Raman echo signals in the achromatic and collimating ozone echo signals and transmitting Rayleigh Li Huibo signals in the achromatic and collimating ozone echo signals so as to separate the achromatic and collimating ozone echo signals into Rayleigh echo signals and Raman echo signals;
the first reflector is used for reflecting the Rayleigh echo signal to the first signal processing module.
Optionally, the surfaces of the meniscus lens and the biconvex lens are provided with ultraviolet light antireflection films.
Optionally, the first signal processing module includes: the second reflector, the first optical filter and the first converging lens;
the second reflecting mirror is used for reflecting the Rayleigh echo signals to the first optical filter;
the first optical filter is used for filtering stray signals in the Rayleigh echo signals and transmitting the stray signals to the first converging lens;
the first converging lens is used for converging the received Rayleigh echo signals so as to obtain Rayleigh light spots and emergent the Rayleigh light spots to the chopped optical disc;
the second signal processing module includes: a third reflecting mirror, a second optical filter and a second converging lens;
the third reflecting mirror is used for reflecting the Raman echo signal to the second optical filter;
the second optical filter is used for filtering stray signals in the Raman echo signals and transmitting the stray signals to the second converging lens;
the second converging lens is used for converging the received Raman echo signals so as to obtain Raman light spots and emergent the Raman light spots to the chopped optical disc.
Optionally, the third reflecting mirror, the second optical filter and the second converging lens are arranged in the first cylinder;
the color separation film is connected with the second signal processing module in a cylindrical mode through the first cylinder;
the second reflecting mirror, the first optical filter and the first converging lens are arranged in a second cylinder;
the first reflecting mirror is connected with the first signal processing module in a cylindrical manner through the second cylinder.
Optionally, the first signal conversion module includes: a first lens group and a first detector;
the first lens group is used for converging the Rayleigh signal to be converted;
the first detector is used for carrying out photoelectric conversion on the converged Rayleigh signal to be converted so as to obtain Rayleigh electric signals;
the second signal conversion module includes: a second lens group and a second detector;
the second lens group is used for converging the Raman signal to be converted;
the second detector is used for carrying out photoelectric conversion on the converged Raman signal to be converted so as to obtain a Raman electric signal.
An ozone detecting lidar comprising: a signal receiving system as claimed in any preceding claim.
From the above technical solution, it can be seen that the embodiment of the present application provides a signal receiving system and an ozone detecting laser radar, where the signal receiving system uses a beam combining optical fiber including a plurality of optical fibers to receive ozone echo signals received by a plurality of split telescopes in a combined telescope, and the beam combining optical fiber receives the ozone echo signals after being processed by an achromatic module to form a rayleigh echo signal and a raman echo signal, and the rayleigh echo signal and the raman echo signal respectively pass through a first signal processing module, a second signal processing module, a chopping disk, a first signal conversion module and a second signal conversion module, and then obtain a rayleigh electric signal and a raman electric signal, so as to implement receiving and processing of the ozone echo signals received by the combined telescope. The signal receiving system utilizes the beam combining optical fiber to receive the ozone echo signals received by the split telescopes, and utilizes the subsequent optical paths to process the ozone echo signals transmitted by the beam combining optical fiber to realize the conversion of optical signals to electric signals, and a plurality of coupling optical paths, photoelectric detectors and acquisition devices are not required to be designed according to the number of single telescopes in the combined telescope, so that the purposes of reducing the cost of the receiving optical paths of the combined telescope, improving the integration level of the receiving optical paths and reducing the debugging difficulty are realized.
In addition, the first signal processing module and the second signal processing module of the signal receiving system are symmetrically arranged about the central axis of the chopped optical disc, so that photoelectric conversion of the Rayleigh echo signal or the Raman echo signal can be realized by independently adjusting the light paths of the first signal processing module and the second signal processing module.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of a signal receiving system according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a combined optical fiber according to an embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of the first fiber optic connector of FIG. 2 along line AA';
FIG. 4 is a schematic cross-sectional view of the beam-combining joint of FIG. 2 along line BB';
fig. 5 is a schematic diagram of a positional relationship between a beam combining optical fiber and a combined telescope according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of specific connection of a signal receiving system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides a signal receiving system, as shown in fig. 1, applied to an ozone detection laser radar, the signal receiving system includes: the telescope 10, the beam combining optical fiber 80, the achromatic module 20, the first signal processing module 30, the second signal processing module 50, the first signal conversion module 40, the second signal conversion module 60 and the chopping disk 70 are combined; wherein,
the combined telescope 10 comprises a plurality of split telescopes for receiving the ozone echo signals of the ozone detection laser radar and transmitting the signals to the beam combining optical fiber 80;
the beam combining optical fiber 80 includes a plurality of optical fibers, one end of each optical fiber is disposed at a focal plane of one of the split telescopes, and the beam combining optical fiber 80 is configured to receive an ozone echo signal transmitted by the combined telescope 10 and transmit the ozone echo signal to the achromatic module 20;
the achromatizing module 20 is configured to perform achromatizing, collimation and color separation processing on the ozone echo signals transmitted by the beam combining optical fiber 80, so as to obtain rayleigh echo signals and raman echo signals respectively transmitted to the first signal processing module 30 and the second signal processing module 50;
the first signal processing module 30 and the second signal processing module 50 are symmetrically arranged about the central axis of the chopped optical disc 70, and the first signal processing module 30 is configured to filter and aggregate the rayleigh echo signals, and obtain rayleigh spot points to emit to the chopped optical disc 70;
the second signal processing module 50 is configured to filter and converge the raman echo signal, obtain a raman spot, and emit the raman spot to the chopper disk 70;
the chopping optical disc 70 is configured to obtain a rayleigh signal to be converted and a raman signal to be converted after performing chopping processing on the rayleigh spot and the raman spot respectively;
the first signal conversion module 40 is configured to receive the rayleigh signal to be converted, and perform photoelectric conversion on the rayleigh signal to be converted to obtain a rayleigh electrical signal;
the second signal conversion module 60 is configured to receive the raman signal to be converted, and obtain a raman electrical signal after performing photoelectric conversion on the raman signal to be converted.
In the practical use process, when an optical fiber is used for receiving an ozone echo signal at the focal plane of the single telescope, the receiving field angle of the ozone detection laser radar is approximately equal to the optical fiber core diameter d of light divided by the focal length f of the single telescope, the receiving field angle of the ozone detection laser radar is larger than the divergence angle of a transmitting light beam, the optical fiber core diameter of the optical fiber is determined in consideration of the receiving field angle requirement of the ozone detection laser radar, and meanwhile, the numerical aperture of the optical fiber is required to be determined according to the principle that the numerical aperture of the optical fiber is larger than the numerical aperture of the single telescope.
In this embodiment, the signal receiving system adopts the beam combining optical fiber 80 including a plurality of optical fibers to receive the ozone echo signals received by the plurality of split telescopes in the combined telescope 10, the ozone echo signals received by the beam combining optical fiber 80 are processed by the achromatic module 20 to form rayleigh echo signals and raman echo signals, and the rayleigh echo signals and raman echo signals are processed by the first signal processing module 30, the second signal processing module 50, the chopping disc 70, the first signal conversion module 40 and the second signal conversion module 60 respectively to obtain rayleigh electric signals and raman electric signals, so as to implement receiving and processing of the ozone echo signals received by the combined telescope 10. The signal receiving system utilizes the beam combining optical fiber 80 to receive the ozone echo signals received by the plurality of split telescopes, and utilizes the subsequent optical paths to process the ozone echo signals transmitted by the beam combining optical fiber 80 so as to realize the conversion of optical signals into electric signals, and a plurality of coupling optical paths, photoelectric detectors and acquisition devices are not required to be designed according to the number of single telescopes in the combined telescope 10, thereby realizing the purposes of reducing the cost of the receiving optical paths of the combined telescope 10, improving the integration level of the receiving optical paths and reducing the debugging difficulty.
In addition, the first signal processing module 30 and the second signal processing module 50 of the signal receiving system are symmetrically arranged about the central axis of the chopper optical disc 70, so that the optical-electrical conversion of the rayleigh echo signal or the raman echo signal can be achieved by individually adjusting the optical paths where the first signal processing module 30 and the second signal processing module 50 are located.
Based on the above embodiments, in one embodiment of the present application, referring to fig. 2, each of the optical fibers includes: a first optical fiber connector 81, a second optical fiber connector, and a transmission optical fiber 82 connecting the first optical fiber connector 81 and the second optical fiber connector; wherein,
the first optical fiber connector 81 is disposed at the focal plane of one of the split telescopes, and the second optical fiber connector is sealed with the second optical fiber connector of the other optical fibers of the beam combining optical fiber 80 to be used as the beam combining connector 83 of the beam combining optical fiber 80.
As shown in fig. 3, fig. 3 is a schematic cross-sectional structure along AA' of a first optical fiber connector 81, where the first optical fiber connector 81 includes an optical fiber core 811 and a first package structure 812 surrounding the optical fiber core 811;
as shown in fig. 4, fig. 4 is a schematic cross-sectional structure of the middle beam-combining connector 83 along BB', the beam-combining connector 83 including a plurality of second optical fiber connectors 831 and a second encapsulation structure 832 surrounding the plurality of second optical fiber connectors 831;
the first package 812 is a metal package or a plastic package;
the second package 832 is a metal package or a plastic package.
The patterns of the first optical fiber connector 81 and the second optical fiber connector are determined according to the optical fiber interface of the combined telescope 10, for example, the common optical fiber connector SMA or FC can be adopted, and the specific connector can be customized according to the actual use requirement.
In the ozone detecting lidar, in order to make the receiving fiber as close to the center of the focal point as possible and to minimize the influence of coma on the receiving efficiency, we preferably adopt a structure in which a layer of the first package structure is enclosed around the fiber core as the first optical fiber joint 81. During the use, a protective shading material is usually arranged around the optical fiber core for protecting the optical fiber core and preventing stray light from affecting the background noise of the laser radar.
Referring to fig. 4, in which a beam combining connector 83 is shown in cross-section including four optical fibers 80, the beam combining connector is composed of 4 second optical fiber connectors 831 and a second package structure 832 surrounding the second optical fiber connectors 831, the second package structure 832 preferably being composed of a metal housing including a hard plastic surrounding the second optical fiber connectors 831 and surrounding the hard plastic for protecting the optical fibers and installing the optical fibers into subsequent optical paths. Of course, the second package 832 may be a separate metal package or plastic package, which is not limited in this application, and the present application is specific to the actual situation.
In fig. 5, the arrangement relationship of the first optical fiber connectors 81 and the combined telescope 10 is shown, in fig. 5, the combined telescope 10 is formed by 4 single telescopes 11, the broken line denoted by the reference numeral Light represents the Light received by the single telescopes, correspondingly, the beam combining optical fiber 80 includes 4 first optical fiber connectors 81 and 4 second optical fiber connectors 831, each first optical fiber connector 81 is installed at the focal plane of one single telescope 11, and the beam combining connector 83 of the beam combining optical fiber 80 is connected to the input end of the achromatic module 20.
Based on the above embodiments, in another embodiment of the present application, still referring to fig. 1, the achromatic module 20 includes: an air gap achromatic lens group 21, a color separator 22, and a first mirror 23, wherein,
the air gap acromatic lens group 21 comprises a meniscus lens and a biconvex lens arranged on one side of the meniscus lens away from the beam combining optical fiber 80, and the air gap acromatic lens group 21 is used for performing acromatic and collimation treatment on the ozone echo signals transmitted by the beam combining optical fiber 80;
the color separation film 22 is configured to reflect a raman echo signal of the achromatic and collimated ozone echo signals and transmit a rayleigh Li Huibo signal of the achromatic and collimated ozone echo signals, so as to separate the achromatic and collimated ozone echo signals into a rayleigh echo signal and a raman echo signal;
the first mirror 23 is configured to reflect the rayleigh echo signal towards the first signal processing module 30.
Considering that the echo signals transmitted by the beam combining optical fiber 802 contain rayleigh signals and raman signals at the same time, the wavelengths of the two signals are different by more than 20 nm, when one lens is used for collimation, obvious chromatic aberration exists, achromatic measures need to be adopted, the two signals are ultraviolet light, the commercial glue achromatic lenses are used for visible light and infrared wave bands, the ultraviolet wave band working requirements cannot be met, due to the absorption effect of a gluing material on the ultraviolet light, an achromatic lens group of an air gap is required to be designed for collimating the echo signals emitted by the optical fiber, due to the fact that the beam combining optical fiber 80 is a multimode optical fiber, the overall core diameter is large, the optical mode after the optical fiber emits is more, preferably, the materials of the meniscus lens and the biconvex lens are different (for example, calcium fluoride materials and fused quartz materials respectively) to reduce the chromatic aberration influence caused by different refractive indexes of the lens thickness, the surface curvature of each lens is optimized according to the core diameter of the optical fiber after the beam combining and the numerical aperture of the optical filter, the optimal collimation degree and the minimum wavefront difference are mainly considered in the optimization process, and the beam after the collimation is obtained, and the beam angle after collimation is ensured within the receiving angle after the collimation is ensured, so that is best transmittance is obtained.
Preferably, the surfaces of the meniscus lens and the biconvex lens are provided with an ultraviolet light antireflection film to increase transmittance.
And considering that the raman echo signal is weaker than the rayleigh echo signal by nearly three orders of magnitude and the difficulty of high-reflectivity coating is small when coating a dichroic film, in this embodiment, the dichroic film is designed to reflect the raman echo signal in the achromatic and collimated ozone echo signal and transmit the rayleigh echo signal in the achromatic and collimated ozone echo signal.
On the basis of the above embodiments, in another embodiment of the present application, still referring to fig. 1, the first signal processing module 30 includes: a second reflecting mirror 31, a first optical filter 32, and a first condensing lens 33;
the second mirror 31 is configured to reflect the rayleigh echo signal toward the first filter;
the first optical filter 32 is configured to filter spurious signals in the rayleigh echo signal and transmit the spurious signals to the first focusing lens;
the first focusing lens 33 is configured to focus the received rayleigh echo signals to obtain rayleigh light spots and emit the rayleigh light spots to the chopper wheel 70;
the second signal processing module 50 includes: a third reflecting mirror 51, a second optical filter 52, and a second condensing lens 53;
the third mirror 51 is configured to reflect the raman echo signal toward the second optical filter;
the second optical filter 52 is configured to filter spurious signals in the raman echo signal and transmit the spurious signals to the second focusing lens;
the second focusing lens 53 is configured to focus the received raman echo signals to obtain a raman light spot and emit the raman light spot to the chopper optical disc 70.
Referring to fig. 1, in practical application, the first mirror 22, the second mirror 31 and the third mirror 51 are arranged to meet the layout requirements of the optical path and the optical path,
on the basis of the above embodiments, in one specific embodiment of the present application, as shown in fig. 6, the third reflecting mirror 51, the second optical filter 52, and the second converging lens 53 are disposed in the first cylinder;
the color separation piece 22 is connected with the second signal processing module 50 in a cylindrical manner through the first cylinder;
the second reflecting mirror 31, the first optical filter 32 and the first converging lens 33 are arranged in a second cylinder;
the first mirror 23 is connected 30 cylindrically to the first signal processing module via the second cylinder.
The first cylinder and the second cylinder can rotate around the central axis AW of the achromatic module in a plane perpendicular to the paper surface, and since the color separation film 22 is connected with the second signal processing module 50 in a round manner through the first cylinder and the first reflecting mirror 23 is connected with the first signal processing module 30 in a cylindrical manner through the second cylinder, the optical paths of the whole system can be ensured not to change in the rotating process of the first cylinder and the second cylinder. The independent rotation of the first cylinder and the second cylinder can make the positions of the optical paths for transmitting the raman echo signals and the optical paths for transmitting the rayleigh echo signals converged on the chopping optical disc 70 different, so that the times of the chopping optical disc 70 for chopping the optical spots are different, that is, the times of the optical spots passing through the notches on the chopping optical disc 70 are different, and when the optical spots pass through the notches of the chopping optical disc 70, the opening height of the laser radar echo signals is determined. When the echo signal passes completely through the notch of the chopper wheel 70, the corresponding echo signal is fully open. Therefore, the opening heights of the two paths of echo signals can be independently adjusted by the independent rotation function of the first cylinder and the second cylinder, and different opening heights of the Raman echo signals of the Rayleigh echo signals of the ozone laser radar can be obtained.
On the basis of the above embodiments, in yet another embodiment of the present application, still referring to fig. 1, the first signal conversion module 40 includes: a first lens group 41 and a first detector 42;
the first lens group 41 is configured to converge the rayleigh signals to be converted;
the first detector 42 is configured to perform photoelectric conversion on the collected rayleigh signals to be converted, so as to obtain rayleigh electrical signals;
the second signal conversion module 60 includes: a second lens group 61 and a second detector 62;
the second lens group 61 is configured to converge the raman signal to be converted;
the second detector 62 is configured to photoelectrically convert the converged raman signal to be converted to obtain a raman electrical signal.
Correspondingly, the embodiment of the application also provides an ozone detection laser radar which comprises the signal receiving system according to any embodiment.
In summary, the embodiment of the application provides a signal receiving system and an ozone detection laser radar, where the signal receiving system uses a beam combining optical fiber including a plurality of optical fibers to receive ozone echo signals received by a plurality of split telescopes in a combined telescope, and the ozone echo signals received by the beam combining optical fiber are processed by an achromatic module to form rayleigh echo signals and raman echo signals, and the rayleigh echo signals and the raman echo signals are processed by a first signal processing module, a second signal processing module, a chopping disk, a first signal conversion module and a second signal conversion module respectively to obtain rayleigh electric signals and raman electric signals, so as to implement receiving and processing of the ozone echo signals received by the combined telescope. The signal receiving system utilizes the beam combining optical fiber to receive the ozone echo signals received by the split telescopes, and utilizes the subsequent optical paths to process the ozone echo signals transmitted by the beam combining optical fiber to realize the conversion of optical signals to electric signals, and a plurality of coupling optical paths, photoelectric detectors and acquisition devices are not required to be designed according to the number of single telescopes in the combined telescope, so that the purposes of reducing the cost of the receiving optical paths of the combined telescope, improving the integration level of the receiving optical paths and reducing the debugging difficulty are realized.
In addition, the first signal processing module and the second signal processing module of the signal receiving system are symmetrically arranged about the central axis of the chopped optical disc, so that photoelectric conversion of the Rayleigh echo signal or the Raman echo signal can be realized by independently adjusting the light paths of the first signal processing module and the second signal processing module.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A signal receiving system for use in an ozone detecting lidar, the signal receiving system comprising: the optical fiber combined telescope comprises a combined telescope body, a beam combining optical fiber, an achromatic module, a first signal processing module, a second signal processing module, a first signal conversion module, a second signal conversion module and a chopping disk; wherein,
the combined telescope comprises a plurality of split telescopes and is used for receiving the ozone echo signals of the ozone detection laser radar and transmitting the signals to the beam combining optical fibers;
the beam combining optical fibers comprise a plurality of optical fibers, one end of each optical fiber is arranged at the focal plane of one split telescope, and the beam combining optical fibers are used for receiving ozone echo signals transmitted by the combined telescope and transmitting the ozone echo signals to the achromatic module;
the achromatizing module is used for carrying out achromatizing, collimation and color separation processing on the ozone echo signals transmitted by the beam combining optical fiber so as to obtain Rayleigh echo signals and Raman echo signals which are respectively transmitted to the first signal processing module and the second signal processing module;
the first signal processing module and the second signal processing module are symmetrically arranged about the central axis of the chopped optical disc, and the first signal processing module is used for filtering and converging the Rayleigh echo signals to obtain Rayleigh light spots to be emitted to the chopped optical disc;
the second signal processing module is used for filtering and converging the Raman echo signals to obtain Raman light spots to be emitted to the chopped optical disc;
the chopping optical disc is used for respectively chopping the Rayleigh light spot and the Raman light spot to obtain a Rayleigh signal to be converted and a Raman signal to be converted;
the first signal conversion module is used for receiving the Rayleigh signal to be converted and obtaining Rayleigh electric signals after photoelectric conversion of the Rayleigh signal to be converted;
the second signal conversion module is used for receiving the Raman signal to be converted and obtaining a Raman electric signal after photoelectric conversion of the Raman signal to be converted.
2. The signal receiving system of claim 1, wherein each of the optical fibers comprises: a first optical fiber connector, a second optical fiber connector, and a transmission optical fiber connecting the first optical fiber connector and the second optical fiber connector; wherein,
the first optical fiber connector is arranged at the focal plane of one split telescope, and the second optical fiber connector is packaged with the second optical fiber connectors of other optical fibers of the beam combining optical fibers to be used as the beam combining connector of the beam combining optical fibers.
3. The signal receiving system of claim 2, wherein the first optical fiber splice comprises an optical fiber core and a first package structure surrounding the optical fiber core;
the beam combining connector comprises a plurality of second optical fiber connectors and a second packaging structure surrounding the second optical fiber connectors;
the first packaging structure is a metal packaging structure or a plastic packaging structure;
the second packaging structure is a metal packaging structure or a plastic packaging structure.
4. The signal receiving system of claim 1, wherein the achromatic module comprises: an air gap achromatic lens group, a color separation film, and a first mirror, wherein,
the air gap achromatic lens group comprises a meniscus lens and a biconvex lens arranged on one side of the meniscus lens, which is away from the beam combining optical fiber, and is used for carrying out achromatism and collimation treatment on an ozone echo signal transmitted by the beam combining optical fiber;
the color separation film is used for reflecting Raman echo signals in the achromatic and collimating ozone echo signals and transmitting Rayleigh Li Huibo signals in the achromatic and collimating ozone echo signals so as to separate the achromatic and collimating ozone echo signals into Rayleigh echo signals and Raman echo signals;
the first reflector is used for reflecting the Rayleigh echo signal to the first signal processing module.
5. The signal receiving system of claim 4, wherein the surfaces of the meniscus lens and the biconvex lens are each provided with an ultraviolet light antireflection film.
6. The signal receiving system of claim 4, wherein the first signal processing module comprises: the second reflector, the first optical filter and the first converging lens;
the second reflecting mirror is used for reflecting the Rayleigh echo signals to the first optical filter;
the first optical filter is used for filtering stray signals in the Rayleigh echo signals and transmitting the stray signals to the first converging lens;
the first converging lens is used for converging the received Rayleigh echo signals so as to obtain Rayleigh light spots and emergent the Rayleigh light spots to the chopped optical disc;
the second signal processing module includes: a third reflecting mirror, a second optical filter and a second converging lens;
the third reflecting mirror is used for reflecting the Raman echo signal to the second optical filter;
the second optical filter is used for filtering stray signals in the Raman echo signals and transmitting the stray signals to the second converging lens;
the second converging lens is used for converging the received Raman echo signals so as to obtain Raman light spots and emergent the Raman light spots to the chopped optical disc.
7. The signal receiving system of claim 6, wherein the third mirror, the second filter, and the second converging lens are disposed in a first cylinder;
the color separation film is connected with the second signal processing module in a cylindrical mode through the first cylinder;
the second reflecting mirror, the first optical filter and the first converging lens are arranged in a second cylinder;
the first reflecting mirror is connected with the first signal processing module in a cylindrical manner through the second cylinder.
8. The signal receiving system of claim 1, wherein the first signal conversion module comprises: a first lens group and a first detector;
the first lens group is used for converging the Rayleigh signal to be converted;
the first detector is used for carrying out photoelectric conversion on the converged Rayleigh signal to be converted so as to obtain Rayleigh electric signals;
the second signal conversion module includes: a second lens group and a second detector;
the second lens group is used for converging the Raman signal to be converted;
the second detector is used for carrying out photoelectric conversion on the converged Raman signal to be converted so as to obtain a Raman electric signal.
9. An ozone detecting lidar, comprising: a signal receiving system as claimed in any one of claims 1 to 8.
CN201810094668.5A 2018-01-31 2018-01-31 Signal receiving system and ozone detection laser radar Active CN108226900B (en)

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