Ozone laser radar signal receiving system based on all-fiber receiving

Abstract

The utility model relates to an ozone laser radar signal receiving system adopting all-fiber receiving. The ozone laser radar signal receiving system comprises a receiving mirror, an optical fiber beam splitter, an optical filter and a detector. The receiving mirror is used for receiving laser radar signals; the optical fiber beam splitter is used for dividing the laser radar signals received by the receiving mirror into different wave bands and outputting the laser radar signals to form the at least two light paths; the at least two optical filters are in one-to-one correspondence with the at least two detectors; the passing wavelengths of the optical filters are different, and the optical filters are located at the corresponding output ends of the optical fiber beam splitter. According to the utility model, a laser radar signal directly enters the optical fiber beam splitter through the receiving mirror, and then enters the detector through the optical filter with the wavelength, so that the all-optical-fiber structural design of the whole receiving system is realized, stray light can be filtered out, and the detection of the selected wavelength is realized; the device has the advantages of simple structure, high compactness, good shock resistance and no need of maintenance.

Description

Technical Field

[0001] The utility model relates to the field of laser radar, in particular to an ozone laser radar signal receiving system with full optical fiber reception. Background Art

[0002] LiDAR generally uses a differential absorption solution for remote sensing of pollutants such as ozone. There will be more than two wavelengths of laser used, and a spectroscopic structure is needed to distinguish echo signals of different wavelengths during detection. In order to distinguish different wavelengths, the spectroscopic structure of the conventional solution is prism spectrometry or grating diffraction spectrometry. The spectroscopic angle of prism spectrometry is small and difficult to integrate. The spectroscopic performance of grating spectrometry is determined by the properties of the gratings, and the more precise the spectroscopic performance, the weaker the light efficiency, which is generally 35% for a single wavelength. Therefore, the above-mentioned traditional solutions have the following disadvantages: the system structure is complex, the anti-seismic effect is poor, the performance is easy to decay, and the maintenance is more troublesome. Utility Model Content

[0003] Based on this, it is necessary to provide an all-fiber ozone lidar signal receiving system to address the problems of complex system structure, poor anti-vibration effect, and troublesome maintenance in existing solutions.

[0004] An all-fiber receiving ozone laser radar signal receiving system, comprising:

[0005] A receiving mirror, which is used to receive laser radar signals;

[0006] A light splitting structure, which is used to split the laser radar signal received by the receiving mirror to form at least two light paths;

[0007] At least two detectors, which correspond to at least two optical paths one by one, and each of the detectors is used to receive the corresponding laser radar signal after the splitting;

[0008] The ozone laser radar signal receiving system adopts an all-fiber structure design, and the light splitting structure includes:

[0009] An optical fiber beam splitter, which is used to divide the laser radar signal received by the receiving mirror into different bands for output, so as to form the at least two optical paths;

[0010] At least two filters correspond one to one with at least two detectors; each filter has a different passing wavelength and is located at the corresponding output end of the optical fiber splitter. The filters are used to pass the laser radar signal of the required wavelength and output it to the corresponding detector.

[0011] As a preferred example, the optical filter and the corresponding detector are light-proofed by an integrated structure, and are detachably connected to the corresponding output end of the optical fiber beam splitter.

[0012] As a preferred example, the splitting band of the optical fiber beam splitter is an ultraviolet band, and the splitting ratio of each output end of the optical fiber beam splitter is 1:1.

[0013] As a preferred example, the passing wavelength of the filter is within the ultraviolet band.

[0014] As a preferred example, the detector is an ultraviolet band detector.

[0015] As a preferred example, the output end of the optical fiber beam splitter, the filter and the detector are all provided with two.

[0016] As a preferred example, the passing wavelengths of the two filters are 289 nm and 316 nm respectively.

[0017] As a preferred example, the output end of the optical fiber beam splitter, the connection between the filter and the detector are all sealed and light-proof.

[0018] As a preferred example, each of the integrated structures comprises:

[0019] A housing having a light-proof cavity therein;

[0020] A holder, comprising two clamping plates, both of which are arranged in the cavity, and the holder is used to fix the corresponding filter;

[0021] An optical fiber connector, which is fixedly connected to one end of the housing, and the optical fiber connector is fixedly connected to one of the clamping plates;

[0022] A detector connector is used to fix the corresponding detector. One end of the detector connector extends into the cavity and is fixedly connected to another clamp. The detector connector is slidably connected to the housing. The detector connector, optical fiber connector and filter are arranged on the same center line.

[0023] As a preferred example, a magnet is provided between the two clamping plates for driving the two clamping plates closer to each other to generate a clamping force.

[0024] The beneficial effects of the utility model are:

[0025] 1. The utility model realizes the full-fiber structure design of the entire receiving system by allowing the laser radar signal to directly enter the fiber optic beam splitter through the receiving mirror, and then enter the detector through the filter of the wavelength. It can filter out stray light and realize the detection of the selected wavelength. It has the advantages of simple structure, high compactness, good shock resistance and no maintenance.

[0026] 2. The utility model uses an integrated packaging setting with light-proof treatment to package the end faces of the optical fiber splitter, filter and detector to ensure that there is no influence of stray light, while further improving the structural compactness and shock resistance of the receiving system, while making the space small, easy to install and highly adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structural connection of the utility model;

[0028] Figure 2 This is a schematic diagram of the integrated structure proposed by the utility model.

[0029] In the figure: receiving mirror 1, fiber optic beam splitter 2, filter 3, detector 4, housing 5, clamping plate 6, fiber optic connector 7, detector connector 8, magnet 9. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0034] See also Figure 1 , this embodiment provides an ozone laser radar signal receiving system for all-fiber reception, which includes a receiving mirror 1, a fiber beam splitter 2, a filter 3 and a detector 4. In this embodiment, the receiving mirror 1 is a telescope composed of a series of lenses, which can receive laser radar signals one kilometer or even several kilometers away. The laser radar signal directly enters the fiber beam splitter 2 via the receiving mirror 1. In this embodiment, taking the dual-wavelength laser radar signal as an example, its ozone laser radar solution uses two wavelengths of 289nm and 316nm. The fiber beam splitter 2 uses high hydroxyl materials in the ultraviolet band to ensure low insertion loss in the ultraviolet band. The output end of the fiber beam splitter 2 is set to two paths, matching the required number of wavelengths. The splitting ratio of the one-to-two fiber beam splitter 2 is 1:1. Two filters 3 in this embodiment are set. The two filters 3 correspond to the output ends of the fiber beam splitter 2 one by one. The filter 3 selects a bandpass filter 3 with a central wavelength of 289nm and 316nm and a bandwidth of 1nm or even smaller. There are also two detectors 4 in this embodiment. The two detectors 4 are respectively arranged at the rear ends of the two filters 3, and the incident light angle of the detector 4 must be consistent with the incident light angle of the filter 3. It should be mentioned that the detector 4 is also required in the conventional solution, and is used to receive the laser radar signal and perform concentration analysis of pollutants such as ozone. The working principle of the detector 4 is the existing technology, and no further elaboration is made here.

[0035] The utility model realizes the full-fiber structure design of the entire receiving system by allowing the laser radar signal to directly enter the optical fiber splitter 2 through the receiving mirror 1 and then enter the detector 4 through the filter 3 of the wavelength, thereby achieving a relatively simple structure and low insertion loss.

[0036] Another design point of the utility model is the integrated light-shielding design of the receiving system. The filter 3 and the detector 4 are integrated into one body through an integrated structure. Figure 2As shown, in this embodiment, the integrated structure includes a housing 5, a clamp, a fiber connector 7 and a detector connector 8. The housing 5 is partially made of an opaque material, and a cavity for installation is provided inside the housing. The clamp includes two clamps 6. Both clamps 6 are provided with through holes corresponding to the fiber beam splitter 2 and the filter 3. One of the clamps 6 is fixedly connected to the cavity, and the other clamp 6 is slidably connected to the inner wall of the cavity, and the two clamps 6 are close to each other through external force, and are used to clamp and fix the filter 3. In this embodiment, a magnet 9 is provided on one side of the two clamps 6 close to each other, and the two clamps 6 can fix the filter 3 through the magnetic force generated by the magnet 9. The external force can also be a spring structure. A spring is provided in the cavity, one end of which is against the inner wall of the cavity, and the other end is against the sliding clamp 6, so that the clamp 6 moves toward the other clamp 6, thereby fixing the filter 3. The fiber connector 7 is fixedly connected to one end of the housing 5 close to the clamp 6. One end of the optical fiber connector 7 is set as a threaded connector, or is provided with a buckle, which can be directly screwed on the optical fiber port of the optical fiber beam splitter 2 to achieve quick installation. The other end of the optical fiber connector 7 extends into the cavity and is fixedly connected to the fixed clamp 6. The detector connector 8 also extends into the cavity at one end, is fixedly connected to the sliding clamp 6, and is slidably connected to the housing 5. The internal shape of the detector connector 8 is adapted according to the specific detector 4 used. If the connector of the detector 4 is cylindrical, it can also be connected by thread. If the connector of the detector 4 is of other shapes, corresponding buckles and clamps can be set for fixing. When the detector 4 is installed, it can be fixed by directly inserting it into the detector connector 8. Finally, all the system components are located in the housing 5, with a compact structure and good light-shielding properties. After the filter 3 and the detector 4 are fixed, it is necessary to ensure that the detector connector 8, the optical fiber connector 7 and the filter 3 are arranged on the same center line so that the laser radar signal can be injected vertically.

[0037] In summary, the utility model uses a fiber optic beam splitter 2 and a filter 3 in combination to form an all-fiber system structure, which does not require maintenance, can filter out stray light and realize detection of selected wavelengths. Through integrated assembly, the ozone lidar signal receiving system has a compact structure, good shock resistance, small space, easy installation and high adaptability. At the same time, the integrated package also ensures that there is no influence of stray light, improving the performance of the entire receiving system. On the other hand, compared with the traditional solution, the light beam utilization efficiency of the receiving system is at the same order of magnitude, but the cost of its optical fiber device is cheaper than that of the grating solution, which is worthy of promotion and use.

[0038] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An all-fiber receiving ozone laser radar signal receiving system, comprising: A receiving mirror (1) for receiving a laser radar signal; A light splitting structure, which is used to split the laser radar signal received by the receiving mirror (1) to form at least two light paths; At least two detectors (4), which correspond one to one to the at least two optical paths, and each of the detectors (4) is used to receive a corresponding laser radar signal after light splitting; It is characterized in that the ozone laser radar signal receiving system adopts an all-fiber structure design, and the splitting structure includes: An optical fiber beam splitter (2) used for dividing the laser radar signal received by the receiving mirror (1) into different wavebands for output, thereby forming the at least two optical paths; At least two filters (3) are provided, which correspond one to one with at least two detectors (4); each filter (3) has a different transmission wavelength and is located at a corresponding output end of the optical fiber beam splitter (2); the filter (3) is used to transmit the laser radar signal of a required wavelength and output it to the corresponding detector (4).

2. The all-fiber ozone laser radar signal receiving system according to claim 1 is characterized in that: The optical filter (3) and the corresponding detector (4) are arranged in a light-proof manner through an integrated structure, and are detachably connected to the corresponding output end of the optical fiber beam splitter (2).

3. The all-fiber ozone laser radar signal receiving system according to claim 1 is characterized in that: The light splitting band of the optical fiber beam splitter (2) is the ultraviolet band, and the light splitting ratio of each output end of the optical fiber beam splitter (2) is 1:

1.

4. The all-fiber ozone laser radar signal receiving system according to claim 1, characterized in that: The passing wavelength of the optical filter (3) is within the ultraviolet band.

5. The all-fiber ozone laser radar signal receiving system according to claim 4 is characterized in that: The detector (4) is an ultraviolet band detector (4).

6. The all-fiber ozone laser radar signal receiving system according to claim 1, characterized in that: The output end of the optical fiber beam splitter (2), the optical filter (3) and the detector (4) are each provided with two.

7. The all-fiber ozone laser radar signal receiving system according to claim 6, characterized in that: The passing wavelengths of the two filters (3) are 289 nm and 316 nm respectively.

8. The all-fiber ozone laser radar signal receiving system according to claim 1, characterized in that: The output end of the optical fiber beam splitter (2), the connection between the filter (3) and the detector (4) are all sealed and light-proof.

9. The all-fiber ozone laser radar signal receiving system according to claim 2, characterized in that: Each of the integrated structures comprises: The housing (5) has a light-proof cavity formed therein; A holder, comprising two clamping plates (6), both of which are arranged in the cavity, and the holder is used to fix the corresponding optical filter (3); An optical fiber connector (7) which is fixedly connected to one end of the housing (5), and the optical fiber connector (7) is fixedly connected to one of the clamping plates (6); A detector connector (8) is used to fix the corresponding detector (4), one end of the detector connector (8) extends into the cavity and is fixedly connected to another clamping plate (6), and the detector connector (8) is slidably connected to the housing (5), and the detector connector (8), the optical fiber connector (7) and the filter (3) are arranged on the same center line.

10. The all-fiber ozone laser radar signal receiving system according to claim 9, characterized in that: A magnet (9) is arranged between the two clamping plates (6) for driving the two clamping plates (6) to move closer to each other and generate a clamping force.

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