Detection device and method for ozone laser radar system

Abstract

The invention provides a detection device and method for an ozone laser radar system, and the device comprises an ultraviolet light source which is used for simulating an atmosphere echo signal; one end of the optical fiber is connected with the output end of the ultraviolet light source; and the input end of the light beam adjusting unit is connected with the output end of the optical fiber, and the light beam adjusting unit is used for performing collimation adjustment and filtering on the transmitted light beam. Through the above technical characteristics, the device detects a single ozone laser radar, and solves an original signal measurement error caused by the influence of transportation, external force or long-term operation on the performance change of an instrument; original signal measurement errors caused by hardware differences among a plurality of devices under the same laser radar network are avoided; moreover, in a relatively complex environment, quality control can be carried out in a movable manner, and a large amount of transportation cost for moving the standard machine to a region where the equipment to be subjected to quality control is located is not needed.

Description

Technical Field

[0001] The present invention generally relates to the field of laser radar, and in particular to a detection device and method for an ozone laser radar system. Background Art

[0002] Ozone (O 3 ) is mainly located in the stratosphere and troposphere, while ozone (O 3 ) is a typical secondary pollutant with strong oxidizing properties. It not only harms the ecosystem and human health, but also affects the growth and photosynthetic rate of plants, inhibits plant growth, and causes crop yield reduction. At the same time, tropospheric ozone (O 3 ) is the third largest greenhouse gas that cannot be ignored, and its content in the atmosphere is increasing year by year. 3 ) pollution has become one of the major air quality problems facing cities and industrialized areas around the world. Many countries have 3 ) concentration is used as one of the criteria for judging the quality of the atmospheric environment.

[0003] Currently, ozone (O 3 ) concentration monitoring methods mainly include ground conventional monitoring (ultraviolet ozone analyzer, differential absorption spectroscopy), sounding balloons, satellite remote sensing and lidar. Among them, sounding balloons, satellite remote sensing and lidar can monitor ozone (O 3 ) vertical profile. However, the cost of sounding balloons is high and the real-time performance is poor, and the spatial resolution of satellite detection in the lower troposphere is low.

[0004] As an effective active optical remote sensing detection device, lidar can monitor atmospheric ozone (O 3 ) concentration, has the advantages of wide detection range, high temporal and spatial resolution, high precision, good accuracy and real-time response. However, there are large differences in laser characteristics, detector characteristics, radar adjustment and other aspects between different lidars. For the same device, over time, changes in the parameters of the instrument itself, or some human interference, cause the error of the equipment to gradually increase, and the accuracy of the equipment's own data is difficult to confirm. Therefore, we need to conduct regular inspections of the radar to ensure the accuracy of the radar detection data. Traditional detection methods generally involve high-altitude comparisons between sounding balloons and towers, which have high requirements for cost and site, and cannot be used as a routine means for regular inspections. Summary of the invention

[0005] According to the present invention, in view of the problems existing in the above-mentioned prior art, a detection device for an ozone laser radar system is provided, including: an ultraviolet light source for simulating atmospheric echo signals; an optical fiber, one end of which is connected to the output end of the ultraviolet light source; a beam adjustment unit, whose input end is interconnected with the output end of the optical fiber, for collimating and filtering the transmitted light beam. By having the above-mentioned technical features, the device detects a single ozone laser radar and solves the original signal measurement error caused by changes in instrument performance due to transportation, external forces, or long-term operation; avoids the original signal measurement error caused by hardware differences between multiple devices in the same laser radar network; and in a relatively complex environment, it can be moved for quality control, without the need to spend a lot of transportation costs to move the standard machine to the area where the quality control equipment is located.

[0006] In some embodiments, the beam adjustment assembly includes a first sleeve assembly, in which a collimation assembly for adjusting the end of the optical fiber is disposed; a second sleeve assembly, connected to the tail of the first sleeve; and also includes a filter assembly, composed of a plurality of filters, located inside the second sleeve, and arranged in an array along the length direction of the second sleeve assembly.

[0007] In some embodiments, the collimation assembly includes a adapter fixed at the end of the first sleeve assembly facing away from the second sleeve assembly, for fixing the optical fiber output end; and also includes an aspheric lens fixed at the end of the first sleeve assembly, and the aspheric lens is also located inside the second sleeve assembly.

[0008] In some embodiments, a mounting platform is further included, wherein the mounting platform includes a base plate in a ring shape;

[0009] The tilting plate is annular and located on one side of the base plate; at least three adjusting columns are provided and are spaced between the base plate and the tilting plate, and both ends of the adjusting columns are connected to the base plate and the tilting plate respectively; the height of the adjusting columns is adjustable; the top plate is located on the side of the tilting plate away from the base plate and is rotatably connected to the tilting plate, and a light source mounting hole is provided on the top plate; at least three retaining components are provided and are located on the side of the base plate away from the tilting plate and are spaced along the annular area of ​​the base plate, and are used to be clamped on the peripheral side of the telescope.

[0010] In some embodiments, the retaining assembly includes an extension rod distributed along the depth direction of the mounting platform, one end of which is connected to the substrate for reciprocating sliding movement away from the center of the substrate; and also includes an arc plate fixed to the other end of the extension rod, with its inner arc side facing the center direction of the substrate.

[0011] The present application also discloses another concept, a method for a detection device of an ozone laser radar system, comprising:

[0012] Divide the telescope into four quadrants;

[0013] The ultraviolet light source is sequentially turned on from the first quadrant to the fourth quadrant, and the detection signal of each corresponding quadrant is collected and obtained for a set time period;

[0014] Calculate and compare the error values ​​between the signal strengths of the four quadrants to see whether the error values ​​are smaller than a first set value.

[0015] The present application also discloses another concept, a method for a detection device of an ozone laser radar system, comprising:

[0016] A cutoff plate is arranged at the light outlet of the ultraviolet light source to ensure that the wavelength emitted by the ultraviolet light source is within a set range;

[0017] By arranging filters of different wavelengths at the position of the filter component, a laser beam of corresponding wavelength is obtained;

[0018] Collect data of the test channel and the crosstalk source channel for a set time as background signal;

[0019] Then, a filter with a wavelength corresponding to the crosstalk source channel is set at the front end of the light source to output laser light with only one wavelength of the crosstalk source;

[0020] After the laser emits light, the set time length data of the channel to be tested and the crosstalk source channel are collected again;

[0021] The deviation values ​​of the two groups of data before and after the channel to be tested are compared, the crosstalk CT of the crosstalk source channel to the optical signal of the channel to be tested is calculated, and it is determined whether the crosstalk is less than the second set value.

[0022] The present application also discloses another concept, a method for a detection device of an ozone laser radar system, comprising:

[0023] Block the telescope receiving area through the detection device of the ozone lidar;

[0024] After continuous acquisition, the working wavelength λ is obtained on and λ off The background noise of the channel is used as the original acquisition data. The acquisition data does not exceed the set time. The distance is used as the horizontal axis and the signal amplitude is used as the vertical axis. The original signal profile is drawn with this group of original acquisition data. The absolute value of the linear fitting slope of the background noise signal profile of each wavelength channel is calculated according to the following formula. The fitting slope should satisfy ≤10 -5

[0025]

[0026] Where: d i is the distance corresponding to the i-th data of the original signal, in m; p iis the signal amplitude of the i-th data of the original signal; is d i The average value of For p i The average value of; n is the number of data included in the calculation.

[0027] The present application also discloses another concept, a method for a detection device of an ozone laser radar system, comprising:

[0028] During detection, attenuation sheets with different transmittances are placed in the radar system to be calibrated in sequence;

[0029] Each time, the raw data of the set time period is continuously collected and saved, and the first peak value of the output signal corresponding to different transmittances is obtained;

[0030] Fitting the first peak points of all transmittances to a straight line;

[0031] Obtaining the simulation value and the measured value at a transmittance of 100% according to the fitted straight line;

[0032] It is determined whether the error between the simulation value and the measured value is less than a third set value.

[0033] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a detection device for ozone laser radar provided by an embodiment of the present invention is shown;

[0035] Figure 2 A cross-sectional view of a beam adjustment unit in a detection device for an ozone laser radar provided by an embodiment of the present invention is shown;

[0036] Figure 3 A schematic diagram of the structure of an installation platform in a detection device for an ozone laser radar provided by an embodiment of the present invention is shown;

[0037] Figure 4 A schematic diagram showing the connection state of a detection device for an ozone laser radar provided by an embodiment of the present invention and a mounting platform and a telescope is shown;

[0038] Figure 5 A schematic diagram showing the detection state principle of a detection device for an ozone laser radar provided by an embodiment of the present invention is shown;

[0039] Figure 6A schematic diagram of the division of telescope quadrants in a detection device for ozone laser radar provided by an embodiment of the present invention is shown.

[0040] Explanation of symbols

[0041] 1. Ultraviolet light source; 2. Optical fiber; 3. Beam adjustment unit; 31. Collimation assembly; 311. Adapter; 312. Aspheric lens; 32. Filter assembly; 33. First sleeve assembly; 331. Outer sleeve part; 332. Inner sleeve part; 34. Second sleeve assembly; 4. Mounting platform; 41. Base plate; 42. Tilt plate; 43. Top plate; 431. Light source mounting hole; 44. Adjustment column; 441. Slide rod; 442. Connecting tube; 45. Retention assembly; 451. Slide plate; 452. Extension rod; 453. Arc plate; 454. Connecting ring; 5. Telescope; 51. Primary mirror; 52. Secondary mirror; 53. Aperture. DETAILED DESCRIPTION

[0042] Hereinafter, preferred embodiments (or implementation modes) of the present invention will be described in detail with reference to the accompanying drawings.

[0043] The traditional detection method for radar is generally to compare sounding balloons and towers at high altitudes, which has high requirements for cost and site, and cannot be used as a regular means for regular detection. The currently disclosed laser radar quality control device belongs to the technical field of environmental and meteorological monitoring equipment, and solves the problem of low accuracy of existing ozone laser radars. Its technical points are: folding the ozone radar transmitting and receiving optical paths so that they pass through the set path detection module, setting an ozone analyzer before and after the path detection module, and comparing the measurement results of the ozone analyzer with the radar measurement results of the corresponding path. However, this quality control method can only calibrate the inversion data, and cannot effectively determine whether the original radar data is accurate.

[0044] Reference below Figure 1-Figure 6 To describe a detection device and method for an ozone lidar system of the present invention.

[0045] Figure 1 The schematic diagram of the structure of a detection device for ozone laser radar provided by an embodiment of the present invention is shown. The detection device includes an ultraviolet light source 1, an optical fiber 2 and a beam adjustment unit 3. One end of the optical fiber 2 is interconnected with the light source output end of the ultraviolet light source 1, and is used to couple the spectrum emitted by the ultraviolet light source 1 to the beam adjustment unit 3.

[0046] In some embodiments, the optical fiber 2 may be a SMA905 optical fiber 2, and its output power is 0.1 mw. In some embodiments, the ultraviolet light source 1 is used to simulate the atmospheric echo signal, and the ultraviolet light source 1 may be a thorlabs ultraviolet broad spectrum light source, and a deuterium lamp is used as the light emitting unit, and its light emitting spectrum covers 200-700 nm.

[0047] Figure 2 FIG. 4 is a cross-sectional view of a beam adjustment unit 3 in a detection device for an ozone laser radar provided by an embodiment of the present invention. Figure 2 As shown, the beam adjustment unit 3 includes a collimating assembly 31, a filtering assembly 32, a first sleeve assembly 33, and a second sleeve assembly 34. The first sleeve assembly 33 is connected end to end with the second sleeve assembly 34, and the collimating assembly 31 is located inside the first sleeve, and the filtering assembly 32 is located inside the second sleeve.

[0048] In some embodiments, the collimator assembly 31 may be a collimator, which is fixed at the end of the optical fiber 2 and is mainly used to limit the propagation direction of the light beam, ray or particle beam, so that it becomes a parallel beam or propagates in a specific direction. In order to reduce costs, in some embodiments, the collimator assembly 31 includes a transition piece 311 and an aspheric lens 312, the transition piece is located at the end of the first sleeve assembly 33 away from the second sleeve assembly 34, and the transition piece 311 includes a tubular area in the middle, and an annular baffle area located on the circumference of the tubular area, one end of the tubular area is used to be plugged with the output end of the optical fiber 2, and a part of the optical fiber 2 is located inside the tubular area, thereby limiting the propagation direction of the light beam in the optical fiber 2. The edge of the baffle area is fixed at the port of the first sleeve assembly to realize that the tubular area is located in the middle area of ​​the first sleeve assembly 33, and the aspheric lens 312 is fixed to the tail end of the first sleeve assembly 33 and is located inside the second sleeve assembly 34 at the same time.

[0049] In order to adjust the distance between the aspheric lens 312 and the light beam, the first sleeve assembly 33 includes an outer sleeve portion 331 and an inner sleeve portion 332. The outer sleeve portion 331 and the inner sleeve portion 332 can be slidably connected to each other or connected by threads to achieve telescopic adjustment of the outer sleeve portion 331 and the inner sleeve portion 332.

[0050] The filter assembly 32 includes a plurality of filters with different central wavelengths, which are coaxially arranged with the second sleeve assembly 34 and arranged in an array along the length direction of the second sleeve assembly 34. The filter assembly 32 is located at the rear end of the aspheric lens 312. After the collimated light from the wide-spectrum light source passes through the filter assembly 32, only the laser with the central wavelength and its bandwidth of the filter is transmitted. According to the radar receiving wavelength, the atmospheric echo signal is simulated, which is convenient for the telescope 5 to perform subsequent crosstalk testing between different signal channels.

[0051] In order to improve the convenience of using the ozone laser radar detection device, it is also used in conjunction with the installation platform 4. Figure 3FIG. 4 shows a schematic diagram of the structure of an installation platform 4 in a detection device for an ozone laser radar provided in an embodiment of the present invention, with reference to FIG. Figure 3 As shown, the mounting platform 4 includes a base plate 41, a tilting plate 42, an adjustment column 44, a top plate 43 and a retaining assembly 45. The base plate 41 and the tilting plate 42 are both annular plates, the tilting plate 42 is located on one side of the base plate 41 and is spaced apart from the base plate 41, and at least three adjustment columns 44 are provided and are located between the base plate 41 and the tilting plate 42, and adjacent adjustment columns 44 are spaced apart.

[0052] In some embodiments, the tilting plate 42 can be coaxially arranged with the base plate 41, and the height of the adjusting column 44 itself can be adjusted. The adjusting column 44 can include a connecting tube 442, and two sliding rods 441 inserted into the connecting tube 442 through the two ends of the connecting tube 442. The ends of the sliding rods 441 and the connecting tube 442 can realize mutual sliding with the connecting tube 442, and can also realize the swing of the sliding rods 441 inside the connecting tube 442. The other ends of the two sliding rods 441 are respectively connected to the base plate 41 and the tilting plate 42. The distance between the tilting plate 42 and the base plate 41 can be adjusted by the mutual sliding of the sliding rods 441 and the connecting tube 442; the pitch angle and angular position of the tilting plate 42 and the base plate 41 can be adjusted by the swing of the sliding rods 441 inside the connecting tube 442.

[0053] The top plate 43 is located on the side of the tilting plate 42 away from the base plate 41. In some embodiments, the top plate 43 can be coaxially arranged with the tilting plate 42, and the top plate 43 can be rotatably connected with the tilting plate 42 around its center, and a light source mounting hole 431 is provided on the top plate 43. In some embodiments, the light source mounting hole 431 can be offset from the center of the top plate 43, and the distance from the center of the top plate 43 is within a set range. Since the detection beam of the detection device needs to act on the primary mirror 51 of the telescope 5 and avoid directly irradiating the secondary mirror 52 of the telescope 5. The aperture range of the ozone laser radar system basically adopts a plug structure of 200-400mm, so the distance from the center of the light source mounting hole 431 to the center of the top plate 43 is within the range of 50-300mm, so the distance from the center of the light source mounting hole 431 to the center of the top plate 43 can be 125mm, or 150mm, 200mm, 250mm.

[0054] The retaining assembly 45 is located on the side of the base plate 41 away from the top plate 43, and multiple retaining assemblies 45 are arranged at intervals in the annular direction around the base plate 41. In this embodiment, four retaining assemblies 45 are used as an example. The retaining assembly 45 includes an extension rod 452, a slide plate 451, and an arc plate 453. The extension rod 452 is in a long strip shape and is distributed along the depth direction of the mounting platform 4. The slide plate 451 is fixed to one end of the extension rod 452 facing the base plate 41, and the slide plate 451 is connected to the side of the base plate 41 away from the top plate 43, and is slidably connected to the base plate 41. Specifically, the slide plate 451 is slidably connected to the base plate 41 away from the center of the base plate 41, and the relative position of the slide plate 451 and the base plate 41 can be limited and fixed. The arc plate 453 is fixed to the other end of the extension rod 452, and the inner arc surface of the arc plate 453 faces the axial direction of the base plate 41, so that through the arrangement of multiple retaining assemblies 45, the multiple arc plates 453 can be used to fix the outer contours of telescopes 5 of different sizes.

[0055] In order to further improve the stability of the arc plate 453 in fixing the telescope 5, the fixing assembly 45 also includes a telescopic ring, through which multiple extension rods 452 are passed. As the slide plate 451 and the base plate 41 slide relative to each other, the telescopic ring can adjust the diameter of the telescopic ring through its own telescopic structure, and make the multiple arc plates 453 fix the outer contour of the telescope 5 more stably.

[0056] In order to be suitable for fixing telescopes 5 of different lengths, the extension rod 452 can be replaced. By replacing the length of the extension rod 452 , telescopes 5 of different lengths can be fixed on the mounting platform 4 .

[0057] Figure 4 FIG. 1 is a schematic diagram showing a connection state of a detection device for an ozone laser radar provided by an embodiment of the present invention, a mounting platform 4, and a telescope 5. Figure 4 As shown, when testing, the telescope 5 to be tested is connected to the mounting platform 4, the lens of the telescope 5 is facing the top plate 43, and the testing device is fixed on the top plate 43, and the beam adjustment unit 3 is fixed in the light source mounting hole 431, so that the testing beam of the testing device is emitted toward the primary mirror 51 of the telescope 5. Then, the testing device and the telescope 53 and the detector in the radar system are turned on.

[0058] Figure 5 FIG. 1 is a schematic diagram showing the principle of the detection state of a detection device for an ozone laser radar provided by an embodiment of the present invention. Figure 5As shown, in order to improve the accuracy of detection and ensure that the collimated light of the light source is coaxial with the radar telescope 5 to be tested, the specific method is to rotate the top plate 43 and adjust the pitch angle and angle position of the top plate 43 and the tilt plate 42 to drive the light source to rotate at a uniform speed. Two points need to be ensured: first, the light spot on the main mirror 51 in the telescope 5 basically rotates around the central aperture 53; second, the light spot position at the incident aperture 53 remains unchanged, and most of the light enters the aperture 53, then the pointing is aligned; if the above two points are not met, the mounting platform 4 is adjusted until it is aligned. The detector in the laser radar processes the echo signal to obtain information about the detection object and determine the alignment.

[0059] The present application also discloses a method for using the above-mentioned detection device for ozone laser radar, comprising the following steps:

[0060] S1: Divide the telescope into quadrants. Figure 6 , Figure 6 A schematic diagram of the division of telescope quadrants in a detection device for ozone laser radar provided by an embodiment of the present invention is shown.

[0061] S2: Input ultraviolet light, input the ultraviolet light source into the positions of the first quadrant to the fourth quadrant respectively, and obtain the atmospheric echo signal of the set time length of the corresponding quadrant.

[0062] S3: Compare the errors, calculate and compare the error values ​​between the signal strengths of the four quadrants, and compare whether the error values ​​are less than the first set value.

[0063] In view of the possible directionality or spatial resolution problems of the ozone radar, the system evaluates its measurement consistency and accuracy in different directions through four-quadrant (or more directions) tests in simulated or actual environments to ensure data reliability under all-round coverage. First, the telescope is divided into four quadrants. When testing the uniformity of the atmospheric echo signal received by the telescope, only one quadrant receives the atmospheric echo signal. First, the ultraviolet light source is shone at the first quadrant position to collect the radar signal for 1 minute, and then the calibration device is rotated in turn so that the light source is shone at the second, third and fourth quadrant positions to collect the radar signal for 1 minute respectively. The error value of the signal strength of the four quadrants is calculated. If it is less than 20%, it is considered that the uniformity of the system's optical antenna is good. If it is greater than 20%, it is considered that the uniformity of the system's optical antenna does not meet the requirements.

[0064] In some embodiments, the present application also discloses a method for using the above-mentioned detection device for ozone laser radar, comprising the following steps:

[0065] S1: Adjust the wavelength and set a cutoff plate at the light outlet of the ultraviolet light source to ensure that the wavelength emitted by the ultraviolet light source is within the set range; optionally, the laser light source is a broadband light source with a light source range of 200-700nm, and a FF01-300 / 80-25 cutoff plate is added to the front end of the light outlet, with parameters of a central wavelength of 300nm and a bandwidth of 80nm, to ensure that the wavelength emitted by the laser is 260-340nm.

[0066] S2: Setting the wavelength, setting filters of different wavelengths at the filter assembly position to obtain a laser beam of the corresponding wavelength; in this embodiment, to obtain a laser beam of the corresponding wavelength, the filter assembly only sets filters of the corresponding wavelength, for example, to achieve a beam of wavelength 266nm, the filter assembly is a 266nm filter. To achieve beams of multiple different wavelengths, the filter assembly includes filters of 266nm, 280nm, 289nm, 295nm, 299nm, and 316nm.

[0067] S3: Record the initial data, collect the data of the test channel and the crosstalk source channel for a set time as the background signal, and record them as x 0 ,y 0 .

[0068] S4: Set the output wavelength of the crosstalk source, and set a filter with the wavelength corresponding to the crosstalk source channel at the front end of the light source. Except for the channel to be measured, all other channels in the radar receiving channel are crosstalk source channels.

[0069] S5: Determine the deviation. After the laser emits light, collect the set time data of the channel to be tested and the crosstalk source channel again, and record them as x 1 ,y 1 ; Compare the deviation values ​​of the two groups of data before and after the channel to be tested, calculate the crosstalk CT of the crosstalk source channel to the optical signal of the channel to be tested, and determine whether the crosstalk is less than the second set value, wherein the formula for calculating the crosstalk CT of the crosstalk source channel to the optical signal of the channel to be tested is:

[0070]

[0071] Where G is the gain ratio between the channel to be tested and the crosstalk source channel.

[0072] Determining whether the crosstalk is less than the second set value is as follows: using this method to test the signal channels corresponding to other emission wavelengths respectively, and the crosstalk CT between all wavelength signal channels ≤ 1% is qualified.

[0073] The working principle of ozone lidar uses the differential absorption method to invert the ozone concentration. This method uses the absorption characteristics of the gas to measure the concentration of the gas. The system emits two laser beams with very close wavelengths into the atmosphere. The wavelength of one laser beam is located at a position where the gas to be measured has strong absorption, recorded as λon, and the wavelength of the other laser beam is located at a position where the gas to be measured has weak or no absorption, recorded as λoff. If the two wavelengths are selected appropriately, the extinction and backscattering effects of other gas molecules and aerosols on the two laser beams are basically the same, then the concentration of the gas molecules to be measured on the common path of the laser can be determined based on the echo signals of the two wavelengths. When the emission wavelength is more than one wavelength, it is necessary to check whether each receiving channel is interfered by the echo signals of other wavelengths of lasers.

[0074] This method conducts test channel crosstalk evaluation by accurately measuring the mutual influence between different test channels, namely the crosstalk effect, to ensure that the ozone radar can accurately distinguish and measure the concentration of each independent ozone layer in a complex environment and avoid measurement errors caused by interference between channels.

[0075] In one embodiment, the laser light source is a broadband light source, the ultraviolet light source range is 200-700nm, and a FF01-300 / 80-25 cutoff plate is added at the front end of the light outlet, and its parameters are a central wavelength of 300nm and a bandwidth of 80nm, so as to ensure that the wavelength emitted by the laser is 260-340nm. By adding filters of different wavelengths, the crosstalk test between signal channels such as 266nm, 280nm, 289nm, 295nm, 299nm, and 316nm can be realized; first, the ozone detection device is adjusted, and the data of the channel to be tested and the crosstalk source channel are collected for 1min as the background signal. Then, a filter of the wavelength corresponding to the crosstalk source channel is set at the front end of the light source to shield the output of other wavelengths of the light source. After the laser emits light, the data of the channel to be tested and the crosstalk source channel are collected again for 1min, and the deviation values ​​of the two groups of data before and after the channel to be tested are compared, and the crosstalk CT of the crosstalk source channel to the optical signal of the channel to be tested is calculated. The crosstalk is qualified if it is less than 1%.

[0076] In some embodiments, the present application also discloses a method for using the above-mentioned detection device for ozone laser radar, comprising the following steps:

[0077] Block the radar light source receiving area, and use the ozone laser radar detection device to block the telescope receiving area, that is, install the detection device above the radar telescope, cover the telescope mouth, so that it only receives the signal light from the detection device light source. At this time, the background signal is the environmental background light signal received by the radar device when the detection device does not emit light.

[0078] After continuous acquisition, the working wavelength λ is obtained on and λ offThe background noise of the channel is used as the original acquisition data. The acquisition data does not exceed the set time. The distance is used as the horizontal axis and the signal amplitude is used as the vertical axis. The original signal profile is drawn with this group of original acquisition data. The absolute value of the linear fitting slope of the background noise signal profile of each wavelength channel is calculated according to the following formula. The fitting slope should satisfy ≤10 -5

[0079]

[0080] Where: d i is the distance corresponding to the i-th data of the original signal, in m; p i is the signal amplitude of the i-th data of the original signal; is d i The average value of For p i The average value of; n is the number of data included in the calculation.

[0081] This method realizes background noise and noise flatness analysis, and systematically and deeply analyzes the background noise level of the ozone radar and its stability at different frequencies or time periods (i.e., noise flatness) to evaluate its impact on the detection capability of weak ozone signals, ensuring that the radar can still maintain a high signal-to-noise ratio under low concentration or high sensitivity requirements.

[0082] In some embodiments, the present application also discloses a method for using the above-mentioned detection device for ozone laser radar, comprising the following steps:

[0083] S1: Set attenuation sheets. Set attenuation sheets with different transmittances in the radar system.

[0084] S2: Test and record data, continuously collect and save raw data of a set time, record the first peak of the output signal corresponding to different transmittance attenuation sheets, and fit all the first peak points into a straight line;

[0085] S3: Comparison and judgment: obtain the simulation value and the measured value at a transmittance of 100% according to the fitted straight line, and judge whether the error between the simulation value and the measured value is less than a third set value.

[0086] This method implements linearity testing; by performing continuous measurements over different ozone concentration ranges, the linear relationship between the ozone radar output signal and the actual ozone concentration is verified to ensure that it can provide accurate and consistent measurement results over the entire range.

[0087] In some embodiments, the radar system to be calibrated is sequentially used without attenuation sheets, and attenuation sheets with transmittances of 80%, 50%, 20% and 10% are added, respectively. Each time, the original data is continuously collected for 1 minute and saved, and then the first peak of the signal is taken respectively, and a total of 5 points are obtained. A straight line is fitted with the points of 80%, 50%, 20% and 10%, and the difference between the value of the fitted straight line at 100% and the measured value is calculated. If it is less than 5%, it is considered that the system linearity is good. If it is greater than 5%, it is considered that the system linearity does not meet the requirements.

[0088] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0089] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A detection device for an ozone laser radar system, characterized in that: include: An ultraviolet light source (1) for simulating an atmospheric echo signal; An optical fiber (2), one end of which is connected to the output end of the ultraviolet light source (1); The light beam adjustment unit (3) has an input end connected to the output end of the optical fiber (2) and is used to collimate and filter the transmitted light beam.

2. A detection device for an ozone laser radar system according to claim 1, characterized in that: The beam adjustment assembly includes A first sleeve assembly (33) in which a collimation assembly (31) for adjusting the end of the optical fiber (2) is arranged; A second sleeve assembly (34) connected to the tail of the first sleeve; and The filter assembly (32) is composed of a plurality of filter sheets, is located inside the second sleeve, and is arranged in an array along the length direction of the second sleeve assembly (34).

3. The detection device for an ozone laser radar system according to claim 1, characterized in that: The collimation assembly (31) comprises An adapter (311) is fixed to the end of the first sleeve assembly (33) facing away from the second sleeve assembly (34) and is used to fix the output end of the optical fiber (2); and also includes An aspheric lens (312) is fixed at the end of the first sleeve assembly (33), and the aspheric lens (312) is also located inside the second sleeve assembly (34).

4. The detection device for an ozone laser radar system according to claim 1, characterized in that: It also includes a mounting platform (4), wherein the mounting platform (4) includes A base plate (41) is annular; A tilting plate (42) is annular and located on one side of the base plate (41); At least three adjusting columns (44) are provided and are spaced apart between the base plate (41) and the tilting plate (42), with both ends of the adjusting columns being connected to the base plate (41) and the tilting plate (42) respectively; and the height of the adjusting columns themselves is adjustable; A top plate (43), located on a side of the tilting plate (42) away from the base plate (41), and rotatably connected to the tilting plate (42), and having a light source mounting hole (431) formed thereon; At least three retaining components (45) are provided, located on the side of the base plate (41) away from the tilting plate (42), and are distributed at intervals along the annular area of ​​the base plate (41) for clamping on the peripheral side of the telescope (5).

5. A detection device for an ozone laser radar system according to claim 4, characterized in that: The retaining assembly (45) comprises An extension rod (452) is distributed along the depth direction of the mounting platform (4), one end of which is connected to the base plate (41) for reciprocating sliding movement in a direction away from the center of the base plate (41); and further includes The arc-shaped plate (453) is fixed to the other end of the extension rod (452), and its inner arc side faces the center direction of the base plate (41).

6. A method for a detection device for an ozone laser radar system, characterized in that: For use in the detection device according to any one of claims 1 to 5, the method comprises: Divide the telescope into four quadrants; The ultraviolet light source is sequentially turned on from the first quadrant to the fourth quadrant, and the detection signal of each corresponding quadrant is collected and obtained for a set time period; Calculate and compare the error values ​​between the signal strengths of the four quadrants to see whether the error values ​​are smaller than a first set value.

7. A method for a detection device for an ozone laser radar system, characterized in that: For use in the detection device according to any one of claims 1 to 5, the method comprises: A cutoff plate is arranged at the light outlet of the ultraviolet light source to ensure that the wavelength emitted by the ultraviolet light source is within a set range; By arranging filters of different wavelengths at the position of the filter component, a laser beam of corresponding wavelength is obtained; Collect data of the test channel and the crosstalk source channel for a set time as background signal; Then, a filter with a wavelength corresponding to the crosstalk source channel is set at the front end of the light source, so that only the laser with one wavelength of the crosstalk source is output; After the laser emits light, the set time length data of the channel to be tested and the crosstalk source channel are collected again; The deviation values ​​of the two groups of data before and after the channel to be tested are compared, the crosstalk CT of the crosstalk source channel to the optical signal of the channel to be tested is calculated, and it is determined whether the crosstalk is less than the second set value.

8. A method for a detection device of an ozone laser radar system, characterized in that: For use in the detection device according to any one of claims 1 to 5, the method comprises: Block the telescope receiving area through the detection device of the ozone lidar; After continuous acquisition, the working wavelength λ is obtained on and λ off The background noise of the channel is used as the original acquisition data. The acquisition data does not exceed the set time. The distance is used as the horizontal axis and the signal amplitude is used as the vertical axis. The original signal profile is drawn with this group of original acquisition data. The absolute value of the linear fitting slope of the background noise signal profile of each wavelength channel is calculated according to the following formula. The fitting slope should satisfy ≤10 -5 Where: d i is the distance corresponding to the i-th data of the original signal, in m; p i is the signal amplitude of the i-th data of the original signal; is d i The average value of For p i The average value of; n is the number of data included in the calculation.

9. A method for a detection device for an ozone laser radar system, characterized in that: For use in the detection device according to any one of claims 1 to 5, the method comprises: During detection, attenuation sheets with different transmittances are placed in the radar system to be calibrated in sequence; Each time, the raw data of the set time period is continuously collected and saved, and the first peak value of the output signal corresponding to different transmittances is obtained; Fitting the first peak points of all transmittances to a straight line; Obtaining the simulation value and the measured value at a transmittance of 100% according to the fitted straight line; It is determined whether the error between the simulation value and the measured value is less than a third set value.

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