CN210954349U - Miniaturized sha shi atmosphere laser radar system - Google Patents
Miniaturized sha shi atmosphere laser radar system Download PDFInfo
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- CN210954349U CN210954349U CN201921548177.XU CN201921548177U CN210954349U CN 210954349 U CN210954349 U CN 210954349U CN 201921548177 U CN201921548177 U CN 201921548177U CN 210954349 U CN210954349 U CN 210954349U
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Abstract
The utility model belongs to the technical field of the laser technology is used, a miniaturized sha shi atmosphere laser radar system is provided, including laser emitter, receiver, bottom plate, temperature control circuit board, drive circuit board, modulation signal generator and light path adjustment mechanism, laser emitter, receiver, temperature control circuit board, drive circuit board, modulation signal generator and light path adjustment mechanism all install on the bottom plate, through light path adjustment mechanism, make the optical system of laser emitter and receiver satisfy sha shi imaging principle. Compared with the existing Sabouraud's atmosphere laser radar system, the miniaturized atmospheric laser radar system has the advantages of smaller volume, lower cost and more portability, and solves the problems that the existing atmospheric laser radar system is large in volume and weight, difficult to move and inconvenient for frequently replacing a measurement site.
Description
Technical Field
The utility model belongs to the technical field of the laser technology is used, a miniaturized sha shi atmosphere laser radar system based on Scheimpflug formation of image principle is related to for detect time, the space evolution process of atmospheric aerosol.
Background
The atmospheric laser radar is an active optical remote sensing detection technology capable of detecting parameters such as atmospheric aerosol extinction, backscattering coefficient, particle size and shape, atmospheric gas concentration and the like. At present, the atmospheric lidar mainly takes pulse type lidar as a main part, the pulse type lidar utilizes a pulse laser to emit nanosecond-level pulse laser to the atmosphere, uses a large-caliber telescope to receive a backscattering signal of a laser pulse, and carries out photoelectric detection through a photomultiplier tube (PMT). The laser used in the system is Nd-YAG laser. The pulse type atmospheric laser radar is developed for two to thirty years, is relatively mature in technology, and is widely applied to atmospheric environment monitoring. However, the pulsed laser radar system is complex, expensive, and high in maintenance cost, which limits the wide application of pulsed atmospheric laser radar technology to some extent. In recent years, researchers have proposed a novel continuous light atmospheric lidar (SLidar) technology based on the principles of sha shi imaging, and applied to the aspects of atmospheric particulate pollution monitoring, atmospheric pollution gas concentration measurement and the like. The SLidar technology is based on the Scheimpflug principle, and has the main connotations that: when the image plane, the object plane and the plane of the lens of the imaging system intersect in a straight line, the imaging system can form a clear image on the object plane and has infinite depth of field. The SLidar technology is compared with the traditional pulse type laser radar, and has the following characteristics: firstly, the system structure is simpler, and the maintenance is easier; and secondly, the Sabouraud atmospheric laser radar adopts a high-power diode laser, so that the structure is compact, the cost is greatly reduced, and more laser wavelengths are selected. Third, the SLidar atmospheric echo signal does not decay with the distance squared. However, although the existing SLidar system overcomes the difficulties of the traditional pulse type atmospheric lidar technology in the aspects of laser source and detection, the size is still large, the system is not portable, and the special application requirements of mobile measurement, miniaturized installation and the like are difficult to meet. In order to overcome the problem, the utility model designs a miniaturized SLidar system, this system is small, compact structure, light in weight, low cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a miniaturized sha shi atmosphere laser radar system compares with current sha shi atmosphere laser radar system, and the structure is compacter, the volume is littleer, weight is lighter, is convenient for remove and outdoor measurement.
The technical content of the utility model is as follows:
a small-sized Sa's atmosphere laser radar system comprises a laser transmitter 1, a receiver 2, a bottom plate 15, a temperature control circuit board 17, a driving circuit board 18, a modulation signal generator 19 and a light path adjusting mechanism, wherein the laser transmitter 1, the receiver 2, the temperature control circuit board 17, the driving circuit board 18, the modulation signal generator 19 and the light path adjusting mechanism are all arranged on the bottom plate 15, and the optical systems of the laser transmitter 1 and the receiver 2 meet the Sa's imaging principle through the light path adjusting mechanism;
the laser transmitter 1 comprises a collimating lens 3, a diode laser module 4 and a connecting piece 5 for connecting the collimating lens 3 and the diode laser module 4;
the receiver 2 comprises a receiving telescope 6, an optical filter, an image sensor 8, an image sensor bracket 10, an image sensor seat 11 and an adapter; a first adapter 12a is arranged at the lens of the receiving telescope 6, the first adapter 12a is connected with a second adapter 12b, and a narrow-band filter 7a and a high-pass filter 7b are arranged in the second adapter 12 b; the second adapter 12b is fixed on one side surface of the image sensor support 10, the image sensor seat 11 is fixed on the other side surface of the image sensor support 10, the image sensor 8 is further fixed on the image sensor support 10, and the image sensor support 10 is fixed on the bottom plate 15, so that the inclination angle of the image sensor 8 relative to the optical axis of the receiving telescope 6 is ensured to be 45 degrees; the image sensor 8 converts the received echo optical signal into a digital electric signal, and further transmits the digital electric signal to the industrial personal computer 9;
the optical path adjusting mechanism comprises an angle adjusting device and an optical axis fixing device; the angle adjusting device comprises a rotary displacement platform 13 and a small bottom plate 14, the laser transmitter 1 is fixed on the small bottom plate 14, and the small bottom plate 14 is fixed on the rotary displacement platform 13; the optical axis fixing device comprises an anchor ear and a gasket 16, the collimating lens 3 is fixed on the small bottom plate 14 through the anchor ear, the receiving telescope 6 is fixed on the bottom plate 15, and the diode laser module 4 is fixed with the small bottom plate 14 through the gasket 15;
the modulation signal generator 19 receives the exposure synchronization signal from the image sensor 8 and generates an on-off modulation signal for the continuous photodiode laser module.
The industrial personal computer 9 is used for buffering and temporarily storing the digital signals provided by the image sensor 8, and performing atmosphere backscattering signal processing and atmosphere parameter estimation; the industrial personal computer 9 and the image sensor 8 are connected in a wired manner.
The imaging principle of satisfying the Sabourdon imaging principle means that the plane of a light beam is positioned by adjusting a light beam collimation structure and a laser emission angle of the light beam collimation structure, the plane of a main optical element of a receiving telescope is positioned, and the plane of an image sensor is positioned, so that clear imaging in a large range from a short distance to a long distance is realized.
The modulation signal generator 19 is based on the johnson counter principle.
The collimating lens 3 adopts a return type lens.
The diode laser module 4 can output laser and can adjust the working temperature and current of the laser.
The receiving telescope 6 adopts a Newton's reflection type receiving telescope.
The image sensor 8 adopts a CCD or CMOS sensor, collects and receives scattered light collected by the telescope 6, converts the scattered light into digital electric signals, and can realize the caching and transmission of data.
The utility model has the advantages that:
first, miniaturized sha shi atmosphere laser radar system is satisfying under the prerequisite of sha shi formation of image principle, through imaging to the laser beam who launches in the atmosphere, obtain the atmosphere backscatter signal of distance resolution with the mode of angle resolution, through using continuous photodiode laser as the light source, regard CCD/CMOS sensor as the detector, system architecture has greatly been simplified, the cost of atmosphere laser radar system has been reduced, the weak point of traditional pulse shi atmosphere laser radar in the aspect of light source and photoelectric detection has been remedied, system architecture's stability and reliability have been increased.
And secondly, compared with the existing Sabouraud's atmosphere laser radar system, the miniaturized system has the advantages of smaller volume, lower cost and more portability, and solves the problems that the existing atmosphere laser radar system is large in volume and weight, difficult to move and inconvenient to frequently replace a measurement site.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the system of the present invention.
Fig. 3 is a system assembly diagram of the present invention.
Fig. 4 is a detailed diagram of the receiver of the present invention.
Fig. 5 is a detailed diagram of the transmitter of the present invention.
In the figure: 1, a laser transmitter; 2, a receiver; 3, collimating the lens; 4 a diode laser module; 5, connecting pieces; 6, receiving a telescope; 7a narrow-band filter; 7b a second filter; 8 an image sensor; 9, an industrial personal computer; 10 an image sensor support; 11 an image sensor mount; 12a first transition piece; 12b a second adaptor; 13 rotating the displacement platform; 14 small bottom plates; 15 a base plate; 16 gaskets; 17 a temperature control circuit board; 18 a drive circuit board; 19 modulation signal generator.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and technical solutions. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting of the invention.
The utility model provides a miniaturized Sa's atmosphere laser radar system based on the Sa's imaging principle, as shown in figures 1 to 5; a small-sized Sa's atmosphere laser radar system comprises a laser transmitter 1, a receiver 2, a bottom plate 15, a temperature control circuit board 17, a driving circuit board 18, a modulation signal generator 19 and a light path adjusting mechanism, wherein the laser transmitter 1, the receiver 2, the temperature control circuit board 17, the driving circuit board 18, the modulation signal generator 19 and the light path adjusting mechanism are all installed on the bottom plate 15, and the optical systems of the laser transmitter 1 and the receiver 2 meet the Sa's imaging principle through the light path adjusting mechanism.
The laser transmitter 1 includes a collimator lens 3, a diode laser module 4, and an adapter 5. In order to increase the detection distance of the system, a high-power diode laser can be selected; the collimating lens 3 adopts a maca lens. The diode laser module 4 and the collimating lens 3 are fixed by a connecting piece 5, one side of the connecting piece 5 is connected with the collimating lens 3 through threads, and the other side of the connecting piece 5 can be inserted into a cylindrical structure of the laser and locked from the side by screws so as to fix a transmitter structure. The laser light is collimated by the collimator lens 3 and then emitted into the atmosphere. In order to reduce the divergence angle of the light beam and to reduce the volume and weight of the transmitter as much as possible, a reflex lens with a focal length of 500mm, a focal ratio of 6.3 and a caliber of 95mm is generally selected.
The receiver 2 includes a receiving telescope 6, a narrowband filter 7a, a second filter 7b, an image sensor 8, and a signal processor 19. The laser beam emitted into the atmosphere is scattered and absorbed by atmospheric molecules and aerosol particles. Wherein, the Newton's reflection type receiving telescope (the focal length is 450mm, the caliber is 114mm) collects the back scattering signal, and the back scattering signal is imaged to the image sensor 8 after passing through the narrow band filter 7a and the second filter 7 b. The inclination of the image sensor 8 with respect to the optical axis of the receiving telescope 6 is designed to be 45 °.
The task of the image sensor 8 is to convert the received echo light signals into digital electrical signals, typically using a CCD or CMOS sensor. The image sensor 8 outputs a digital electrical signal to a signal processor, and the signal processor generally selects an industrial personal computer. The industrial personal computer 9 and the image sensor 8 are connected by a USB cable to complete data transmission, complete the processing of atmosphere backscattering signals and extract various atmosphere parameters. The narrow-band filter 7a, the second filter 7b, the image sensor 8, the image sensor support 10, the image sensor seat 11 and the adapters 12a and 12b form a receiving assembly, a through groove is formed in the bottom of the image sensor support 10, a threaded hole matched with the through groove is formed in the bottom plate 15, the receiving assembly can be fixed on the bottom plate, and then the receiving assembly is inserted into the receiving telescope 6.
Under the condition of ensuring that the optical axis interval of the transmitter 1 and the receiver 2 is about 450mm (the focal length of a receiving telescope), the optical structure of the miniaturized Sabouraud atmospheric lidar can meet the Sabouraud imaging principle, namely, the plane of the center of the laser transmitter 1 or the emitted light beam, the plane of the image sensor 8 and the plane of the optical axis of the receiver 2 are intersected. By adjusting the angle of the laser transmitter 1, the laser beam is positioned at the center of the field of view of the receiver 2, so that clear imaging in a wide range from a short distance to a long distance is realized.
The light path adjusting mechanism comprises an angle adjusting device and an optical axis fixing device. The angle adjusting device consists of a rotary displacement platform 13 and a small bottom plate 14. The rotary displacement platform 13 is provided with a through hole, the bottom plate 15 is provided with a threaded hole matched with the through hole, the rotary displacement platform 13 can be fixed on the bottom plate 15 through screws, the small bottom plate 14 is fixed on the rotary displacement platform 13 in the same way, and the included angle between the optical axes of the laser transmitter 1 and the receiver 2 can be adjusted by rotating the spiral knob of the rotary displacement platform 13. The optical axis fixing device comprises 4 hoops a1, a2, a3 and a4 for fixing the collimating lens, 4 hoops b1, b2, b3, b4 for fixing the receiving telescope and 1 gasket 16. The laser is fixed on the small bottom plate 14 through the gasket 16, then 2 hoops a1 and a2 are fixed on the small bottom plate 14 through threaded holes, the collimating lens 3 is put in, the remaining 2 hoops a3 and a4 are matched and locked with the hoops, next 2 hoops b1 and b2 are fixed on the bottom plate 15, the receiving telescope 6 is put in the hoops, and then the remaining 2 hoops b3 and a4 are matched and locked with the hoops, and the optical axes of the transmitter and the receiver can be kept horizontal through the operation.
When the atmospheric aerosol is measured, in order to eliminate the influence of the solar background signal on the laser radar echo signal, the narrow-band filter 7a and the second filter 7b are required to be used for suppressing the intensity of the background signal, and the on-off modulation is required to be carried out on the emission light intensity of the diode laser. The method is that the exposure clock signal generated by the image sensor 8 triggers the modulation signal generator 19 to generate a modulation square wave signal, and the square wave signal triggers the driving circuit board 18 to generate square wave current, so that the square wave modulation of the laser intensity emitted by the diode laser module 4 is realized. The modulation signal generator 19 is typically based on the johnson counter principle.
The working mode of the miniaturized Sabourne atmosphere laser radar system is as follows:
the temperature control circuit board 17 and the driving circuit board 18 are controlled through the industrial personal computer 9, the working temperature and the working current of the laser are preset, and laser emitted by the diode laser module 4 is collimated by the collimating lens and then emitted into the atmosphere.
The exposure clock signal generated by the image sensor 8 triggers the modulation signal generator 19 to generate a modulation square wave signal, and the square wave signal triggers the driving circuit board 8 of the laser to generate square wave current, so that square wave modulation of the light intensity emitted by the diode laser module is realized. The image sensor 8 alternately records the laser beam image and the atmosphere background image, and sends the laser beam image and the atmosphere background image to the industrial personal computer 9 for analysis and processing, and finally, an atmosphere echo signal is obtained.
Claims (8)
1. A small-sized Sa's atmosphere laser radar system is characterized by comprising a laser transmitter (1), a receiver (2), a bottom plate (15), a temperature control circuit board (17), a driving circuit board (18), a modulation signal generator (19) and a light path adjusting mechanism, wherein the laser transmitter (1), the receiver (2), the temperature control circuit board (17), the driving circuit board (18), the modulation signal generator (19) and the light path adjusting mechanism are all arranged on the bottom plate (15), and the optical systems of the laser transmitter (1) and the receiver (2) meet the Sa's imaging principle through the light path adjusting mechanism;
the laser transmitter (1) comprises a collimating lens (3), a diode laser module (4) and a connecting piece (5) for connecting the collimating lens (3) and the diode laser module (4);
the receiver (2) comprises a receiving telescope (6), an optical filter, an image sensor (8), an image sensor bracket (10), an image sensor seat (11), an industrial personal computer (9) and an adapter piece; a first adapter (12a) is arranged at the lens of the receiving telescope (6), the first adapter (12a) is connected with a second adapter (12b), and a narrow-band optical filter (7a) and a second optical filter (7b) are arranged in the second adapter (12 b); the second adapter piece (12b) is fixed on one side face of the image sensor support (10), the image sensor seat (11) is fixed on the other side face of the image sensor support (10), the image sensor (8) is further fixed on the image sensor support (10), and the image sensor support (10) is fixed on the bottom plate (15) to ensure that the inclination angle of the image sensor (8) relative to the optical axis of the receiving telescope (6) is 45 degrees; the image sensor (8) converts the received echo light signal into a digital electric signal and further transmits the digital electric signal to the industrial personal computer (9);
the optical path adjusting mechanism comprises an angle adjusting device and an optical axis fixing device; the angle adjusting device comprises a rotary displacement platform (13) and a small bottom plate (14), the laser transmitter (1) is fixed on the small bottom plate (14), and the small bottom plate (14) is fixed on the rotary displacement platform (13); the optical axis fixing device comprises an anchor ear and a gasket (16), the collimating lens (3) is fixed on the small bottom plate (14) through the anchor ear, the receiving telescope (6) is fixed on the bottom plate (15), and the diode laser module (4) and the small bottom plate (14) are fixed through the gasket 15;
the modulation signal generator (19) receives an exposure synchronizing signal from the image sensor (8) and generates an on-off modulation signal for the continuous light diode laser module;
the industrial personal computer (9) buffers and temporarily stores the digital electric signals provided by the image sensor (8), and performs atmospheric backscattering signal processing and atmospheric parameter estimation; the industrial personal computer (9) is connected with the image sensor (8) in a wired mode.
2. The miniaturized Sabouraud atmospheric lidar system according to claim 1, wherein the image sensor (8) is a CCD or CMOS sensor, collects the scattered light collected by the receiving telescope (6), converts the scattered light into a digital electric signal, and can realize the buffering and transmission of data.
3. The miniaturized sargassum atmospheric lidar system of claim 1 or 2, wherein the receiving telescope (6) is a newton's reflex receiving telescope.
4. The miniaturized sargassum atmospheric lidar system of claim 1 or 2, wherein the collimating lens (3) is a reflex lens.
5. The miniaturized Sabouraud atmospheric lidar system according to claim 3, wherein the collimating lens (3) is a reflex lens.
6. The miniaturized Sabouraud atmospheric lidar system according to claim 1, 2, or 5, wherein the diode laser module (4) is capable of outputting laser light and adjusting the working temperature and current of the laser.
7. The miniaturized Sabouraud atmospheric lidar system according to claim 3, wherein the diode laser module (4) is capable of outputting laser light and adjusting the operating temperature of the laser.
8. The miniaturized Sabouraud atmospheric lidar system according to claim 4, wherein the diode laser module (4) is capable of outputting laser light and adjusting the operating temperature of the laser.
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| CN201921548177.XU CN210954349U (en) | 2019-09-18 | 2019-09-18 | Miniaturized sha shi atmosphere laser radar system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456384A (en) * | 2019-09-18 | 2019-11-15 | 大连理工大学 | A kind of miniaturization Sharpe atmospheric laser radar system |
| CN113670885A (en) * | 2021-09-13 | 2021-11-19 | 北京理工大学 | Fluorescent aerosol concentration detection device and method based on Shar imaging |
-
2019
- 2019-09-18 CN CN201921548177.XU patent/CN210954349U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456384A (en) * | 2019-09-18 | 2019-11-15 | 大连理工大学 | A kind of miniaturization Sharpe atmospheric laser radar system |
| CN113670885A (en) * | 2021-09-13 | 2021-11-19 | 北京理工大学 | Fluorescent aerosol concentration detection device and method based on Shar imaging |
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