Middle-layer atmosphere detection device

Abstract

The invention provides a middle-layer atmosphere detection device, and relates to the technical field of laser radars, and the device comprises a captive balloon; the mounting frame is connected with the captive balloon through a mounting line; the Rayleigh laser radar is configured on the mounting frame and is suitable for detecting the temperature and density of the middle-layer atmosphere located above the captive balloon to obtain detection data; the ceilometer is suitable for measuring the height of a cloud layer; and the control equipment is suitable for increasing the height of the captive balloon until the height of the cloud layer is less than the height of the Rayleigh laser radar under the condition that the height of the cloud layer is greater than or equal to the height of the Rayleigh laser radar.

Description

Technical Field

[0001] The present disclosure relates to the field of laser radar technology, and in particular to a mid-level atmosphere detection device. Background Art

[0002] LiDAR (LiDAR) has a wide range of applications in atmospheric sensing. By collecting backscattered signals from atmospheric molecules or components, LiDAR can detect environmental parameters in the middle atmosphere. Based on their detection principles, LiDAR includes Raman scattering LiDAR, Rayleigh scattering LiDAR, and resonance fluorescence LiDAR. Rayleigh scattering LiDAR is a primary method for detecting middle atmospheric temperature and density and studying atmospheric dynamics.

[0003] The use of ground-based Rayleigh LiDAR in related technologies increases detection costs due to the long distance from the target detection area and cannot avoid the influence of near-ground climate and detection timing. When Rayleigh LiDAR is mounted on an airborne platform, the amount of detection data is limited due to the aircraft's high speed and poor endurance. When Rayleigh LiDAR is mounted on a spherical platform, the uncontrollable flight attitude and heading make it impossible to achieve maneuverable control and fixed-point detection. Summary of the Invention

[0004] In view of this, the present disclosure provides a meso-atmosphere detection device for realizing maneuverable control and fixed-point detection, comprising: a tethered balloon; a mounting frame connected to the tethered balloon via a mounting line; a Rayleigh laser radar, disposed on the mounting frame and adapted to detect the temperature and density of the meso-atmosphere above the tethered balloon to obtain detection data; a ceilometer, adapted to measure cloud height; and a control device, adapted to raise the altitude of the tethered balloon when the cloud height is greater than or equal to the cloud height, until the cloud height is less than the cloud height.

[0005] According to an embodiment of the present disclosure, when the cloud layer height is greater than or equal to the height of the Rayleigh lidar, the control device raises the height of the tethered balloon through the tethered cable controller of the tethered balloon, thereby raising the height of the Rayleigh lidar.

[0006] According to an embodiment of the present disclosure, the resultant force of the mounting line on the mounting bracket is on the same vertical line as the center of gravity of the Rayleigh laser radar; the mounting bracket is suitable for fixing the Rayleigh laser radar so that the emission light beam of the Rayleigh laser radar is at an oblique upward angle to detect the temperature and density of the middle atmosphere above the tethered balloon.

[0007] According to an embodiment of the present disclosure, the above-mentioned Rayleigh lidar includes: a laser emitting unit, adapted to emit laser toward the above-mentioned middle atmosphere; an optical receiving unit, adapted to receive an echo signal based on the above-mentioned laser backscattered from the above-mentioned middle atmosphere; and a signal detection unit, adapted to obtain the above-mentioned detection data based on the above-mentioned echo signal.

[0008] According to an embodiment of the present disclosure, the receiving field of view of the optical receiving unit is larger than the divergence angle of the laser emitting unit.

[0009] According to an embodiment of the present disclosure, it also includes: an attitude detection device, mounted on the above-mentioned mounting frame, suitable for obtaining the attitude information of the above-mentioned Rayleigh laser radar; a control turntable, configured on the above-mentioned mounting frame, suitable for adjusting the detection direction of the above-mentioned Rayleigh laser radar according to the above-mentioned attitude information and a predetermined reference attitude.

[0010] According to an embodiment of the present disclosure, the center of gravity of the above-mentioned attitude detection device and the center of gravity of the above-mentioned Rayleigh laser radar are on the same vertical line.

[0011] According to an embodiment of the present disclosure, it further includes: a ground station adapted to obtain the temperature and density of the middle atmosphere based on the above-mentioned attitude information and the above-mentioned detection data.

[0012] According to an embodiment of the present disclosure, the above-mentioned ground station includes: a ground optical terminal, which is suitable for establishing a first communication link between the above-mentioned ground station and the above-mentioned tethered balloon.

[0013] According to an embodiment of the present disclosure, the tethered balloon includes: a communication module, adapted to establish a second communication link between the Rayleigh lidar and the tethered balloon.

[0014] According to the embodiments of the present disclosure, by using a Rayleigh LiDAR mounted on a tethered balloon, it is possible to achieve maneuverable control of the aerial position of the Rayleigh LiDAR, perform fixed-point detection of the middle atmosphere, possess altitude control capabilities, and avoid the impact of adverse conditions such as unstable wind fields and clouds on the detection of the Rayleigh LiDAR, thereby improving the acquisition rate of effective data. By using a Rayleigh LiDAR mounted on a tethered balloon, it is also possible to avoid the impact of adverse weather conditions near the ground on the detection data. Depending on the actual weather conditions, the Rayleigh LiDAR can reach above the clouds, away from the interference of near-ground aerosols and climate, and maintain detection capabilities in environments such as low visibility and fog. At the same time, it avoids near-ground atmospheric attenuation, further enhancing the detection capability while maintaining the hardware conditions of the Rayleigh LiDAR, making it suitable for long-term continuous detection of the middle atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0016] Figure 1 Schematically shows Figure 1 A schematic diagram of a mid-level atmosphere detection device according to an embodiment of the present disclosure is schematically shown;

[0017] Figure 2 A schematic diagram schematically illustrates the force exerted by the mounting wire on the mounting frame according to an embodiment of the present disclosure;

[0018] Figure 3 A schematic diagram schematically shows a connection structure between a mounting wire and a mounting frame according to an embodiment of the present disclosure;

[0019] Figure 4 Schematically shows a schematic diagram of a mid-level atmosphere detection device according to another embodiment of the present disclosure;

[0020] Figure 5 The figure schematically shows a middle atmosphere detection device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0023] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0024] When expressions such as “at least one of A, B, and C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, and C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc. When expressions such as “at least one of A, B, or C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, or C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.

[0025] It should also be noted that directional terms such as "upper," "lower," "front," "back," "left," and "right" mentioned in the embodiments are merely references to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, identical elements are represented by identical or similar reference numerals. Conventional structures or configurations will be omitted where they may cause confusion in understanding this disclosure.

[0026] Related technologies like ground-based, airborne, and spherical Rayleigh LiDARs suffer from the inability to avoid climate impacts and achieve fixed-point detection. In practical applications, there's also the issue of limited detection data, requiring the Rayleigh LiDAR to complete its detection mission and return to the ground before processing can begin.

[0027] The present disclosure provides a mid-level atmosphere detection device, in order to solve at least one of the above technical problems.

[0028] Figure 1 A schematic diagram of a mid-level atmosphere detection device according to an embodiment of the present disclosure is schematically shown.

[0029] like Figure 1 As shown, the middle atmosphere detection device includes a tethered balloon 1, a mounting frame 3, a mounting line 4, a Rayleigh lidar 5, a ceilometer and a control device 2.

[0030] According to an embodiment of the present disclosure, a mounting frame 3 is connected to a tethered balloon 1 via a mounting line 4. A Rayleigh LiDAR 5 is mounted on the mounting frame 3 and is adapted to detect the temperature and density of the middle atmosphere above the tethered balloon 1 and obtain detection data. A ceilometer is adapted to measure cloud height. When the cloud height is greater than or equal to the height of the Rayleigh LiDAR 5, the control device 2 is adapted to raise the tethered balloon 1 until the cloud height is less than the height of the Rayleigh LiDAR 5.

[0031] According to an embodiment of the present disclosure, the Rayleigh laser radar 5 is mounted on the tethered balloon 1 via a mounting frame 3 and a mounting line 4. The height difference between the Rayleigh laser radar 5 and the tethered balloon 1 is relatively fixed. Compared to the height of the middle atmosphere, the height position of the Rayleigh laser radar 5 and the tethered balloon 1 is basically the same. In one embodiment, the ceilometer can be set on the ground ( Figure 1 not shown).

[0032] According to an embodiment of the present disclosure, the tethered balloon 1 can generate buoyancy by utilizing differences in gas density. Based on the control device 2, the tethered balloon 1 can control its altitude. The tethered balloon 1 can also include a power supply module to provide power to the control device 2 and the Rayleigh LiDAR 5.

[0033] According to the embodiments of the present disclosure, by using a Rayleigh LiDAR mounted on a tethered balloon, the aerial position of the Rayleigh LiDAR can be maneuvered and controlled, and fixed-point detection of the middle atmosphere can be performed. The radar has the ability to control altitude, and can avoid the influence of adverse conditions such as unstable wind fields and clouds on the detection of the Rayleigh LiDAR, thereby improving the acquisition rate of effective data. By using a Rayleigh LiDAR mounted on a tethered balloon, the influence of adverse weather near the ground on the detection data can also be avoided. According to the actual weather conditions, the radar can reach above the cloud layer, away from the interference of near-ground aerosols and climate, and can maintain detection capabilities in environments such as low visibility and fog. At the same time, it avoids near-ground atmospheric attenuation, further enhances the detection capability when the hardware conditions of the Rayleigh LiDAR remain unchanged, and is suitable for long-term continuous detection of the middle atmosphere. In addition, the middle-level atmosphere detection device of the embodiments of the present disclosure can perform observations required by multiple scenarios such as short-term, long-term, and multiple ascents and descents, and at the same time has high risk resistance, and has the advantages of strong maintainability, low cost, and high efficiency.

[0034] like Figure 1 As shown, in one embodiment, the control device 2 can be carried on the tethered balloon 1.

[0035] According to an embodiment of the present disclosure, when the cloud height is greater than or equal to the height of the Rayleigh lidar 5, the control device 2 raises the height of the tethered balloon 1 through the tethered cable controller of the tethered balloon 1, thereby raising the height of the Rayleigh lidar 5.

[0036] Figure 2 The figure schematically shows the force exerted by the mounting wire on the mounting frame according to an embodiment of the present disclosure.

[0037] like Figure 2 As shown, according to an embodiment of the present disclosure, the resultant force F of the mounting wire 4 acting on the mounting frame 3 is on the same vertical line as the center of gravity G of the Rayleigh laser radar 5 .

[0038] According to an embodiment of the present disclosure, the mounting bracket 3 is adapted to fix the Rayleigh laser radar 5 so that the emission light beam of the Rayleigh laser radar 5 is directed obliquely upward to detect the temperature and density of the middle atmosphere above the tethered balloon 1 .

[0039] According to the embodiment of the present disclosure, the mounting line 4 is a flexible connection, and the cable connector connects the tethered balloon 1 and the mounting bracket 3. The mounting bracket 3 is a hard connection, which can ensure the stability of the Rayleigh LiDAR 5 during the mounting process and can also be used to install other equipment to assist the detection of the Rayleigh LiDAR 5.

[0040] Figure 3 The figure schematically shows the connection structure between the mounting wire and the mounting frame according to an embodiment of the present disclosure.

[0041] like Figure 3 As shown, in one embodiment, the mounting line may include a suspension cable, a cable connector, a shackle, etc. The cable connector has rings at both ends connected to the suspension cable (with a ring at the tail) through a shackle (semi-circular, with a detachable horizontal line part).

[0042] In one embodiment, one end of a suspension cable is connected to the tethered balloon 1 via a cable connector and a shackle, providing a fulcrum for mounting the tethered balloon. The other end of the suspension cable is connected to the mounting frame 3 via a cable connector and a shackle, ensuring that the mounting frame 3 and the Rayleigh LiDAR 5 remain horizontal and stable, allowing the Rayleigh LiDAR 5 to maintain a stable upward detection position during the mounting process and preventing the Rayleigh LiDAR 5 from drifting during detection.

[0043] According to an embodiment of the present disclosure, the Rayleigh laser radar 5 includes a laser emitting unit, an optical receiving unit and a signal detecting unit.

[0044] According to an embodiment of the present disclosure, the laser emitting unit is adapted to emit laser light toward the middle atmosphere; the optical receiving unit is adapted to receive an echo signal based on backscattering of the laser light from the middle atmosphere; and the signal detection unit is adapted to obtain detection data based on the echo signal.

[0045] In one embodiment, the Rayleigh laser radar 5 further includes a power conversion unit, and the power supply module of the tethered balloon 1 supplies power to the Rayleigh laser radar 5 through the power conversion unit.

[0046] In one embodiment, the Rayleigh laser radar 5 can also be provided with a protective cover at the front end to prevent clouds, rain, fog, etc. in the surrounding environment from directly contacting the optical receiving unit, thereby avoiding reducing the collection efficiency of the echo signal, and also preventing direct sunlight from damaging the optical receiving unit during the ascent and descent of the tethered balloon 1.

[0047] According to an embodiment of the present disclosure, the receiving field of view of the optical receiving unit is larger than the divergence angle of the laser emitting unit.

[0048] In one embodiment, the laser emitting unit can emit a laser with a wavelength of 532nm; the receiving field of view of the optical receiving unit is larger than the divergence angle of the laser emitting unit to meet the requirement of matching the transmitting and receiving fields of view; the signal detection unit can convert the backscattered echo signal into single-photon detection data, and record and store it.

[0049] Figure 4 A schematic diagram of a mid-level atmosphere detection device according to another embodiment of the present disclosure is schematically shown.

[0050] like Figure 4 As shown, according to an embodiment of the present disclosure, the mid-level atmosphere detection device further includes an attitude detection device 6 and a control turntable 7.

[0051] According to an embodiment of the present disclosure, the attitude detection device 6 is mounted on the mounting frame 3, which is suitable for obtaining the attitude information of the Rayleigh laser radar 5; the control turntable 7 is configured on the mounting frame 3, which is suitable for adjusting the detection direction of the Rayleigh laser radar 5 according to the attitude information and the predetermined reference attitude.

[0052] According to an embodiment of the present disclosure, the predetermined reference posture can be a situation where the angle between the emission light beam of the Rayleigh laser radar 5 and the sun's line meets the preset conditions and the Rayleigh laser radar 5 is in a stable state, so that the Rayleigh laser radar 5 can avoid direct sunlight and perform detection work smoothly.

[0053] In one embodiment, the attitude detection device 6 can be a device with a navigation function. The attitude detection device 6 can include an attitude detection device host and an antenna, and can obtain the attitude information of the Rayleigh laser radar 5 in real time. The control turntable 7 can adjust the detection direction based on the attitude information to prevent the detection direction of the Rayleigh laser radar 5 from coinciding with sunlight during the detection process, thereby avoiding damage to the optical receiving unit of the Rayleigh laser radar 5 and its subsequent optical devices.

[0054] According to an embodiment of the present disclosure, the center of gravity of the attitude detection device and the center of gravity of the Rayleigh laser radar are on the same vertical line.

[0055] According to an embodiment of the present disclosure, the mesosphere detection device further includes a ground station. The ground station is adapted to obtain the temperature and density of the mesosphere based on the attitude information and the detection data.

[0056] In one embodiment, the ground station may include a ground control module for issuing control instructions based on the attitude information to control the state of the Rayleigh lidar 5, for example, turning detection on or off.

[0057] Figure 5 The figure schematically shows a middle atmosphere detection device according to another embodiment of the present disclosure.

[0058] like Figure 5 As shown, according to an embodiment of the present disclosure, the ground station may include a ground optical terminal, which is suitable for establishing a first communication link 8 between the ground station and the tethered balloon 1.

[0059] In one embodiment, the tethered balloon 1 can establish a first communication link 8 with a ground station via an optical cable and a ground optical terminal, so as to facilitate the transmission of control instructions and detection data between the tethered balloon 1 and the ground control module. Both ends of the first communication link 8 can be set as network ports.

[0060] In one embodiment, when the cloud height is less than the height of the Rayleigh laser radar 5, the ground control module determines whether the Rayleigh laser radar 5 is suitable for starting the detection working state based on the posture information. When the posture of the Rayleigh laser radar 5 is in a predetermined reference posture, the ground control module issues a control instruction to start the detection working state.

[0061] like Figure 5 As shown, according to an embodiment of the present disclosure, the tethered balloon 1 may further include a communication module, which is suitable for establishing a second communication link 9 between the Rayleigh laser radar 5 and the tethered balloon 1 to facilitate the transmission of control instructions and detection data between the Rayleigh laser radar 5 and the tethered balloon 1.

[0062] In one embodiment, the second communication link 9 can store the detection data, upload the detection data to the tethered balloon 1, and then transmit the detection data to the ground station through the second communication link 9.

[0063] According to the embodiments of the present disclosure, the first communication link and the second communication link can realize the attitude control of the Rayleigh LiDAR carried on the tethered balloon through ground operation, and can complete the real-time control of the attitude of the Rayleigh LiDAR, and can ensure that the Rayleigh LiDAR is always in the best detection angle and position, reducing the invalid detection data caused by untimely attitude adjustment. Real-time attitude control can also ensure that the Rayleigh LiDAR maintains a stable and precise attitude in a complex environment, thereby improving the accuracy of the detection data.

[0064] According to the embodiments of the present disclosure, the first communication link and the second communication link can also realize real-time transmission of detection data, thereby improving the detection efficiency of the middle atmosphere and making the detection operation of the middle atmosphere more convenient.

[0065] The above describes the embodiments of the present disclosure. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be advantageously used in combination. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A mid-level atmosphere detection device, comprising: tethered balloons; a mounting frame connected to the tethered balloon via a mounting line; a Rayleigh laser radar, disposed on the mounting frame, adapted to detect the temperature and density of the middle atmosphere above the tethered balloon to obtain detection data; Ceilometers, suitable for measuring cloud height; The control device is adapted to raise the altitude of the tethered balloon when the cloud layer height is greater than or equal to the altitude of the Rayleigh laser radar until the cloud layer height is less than the altitude of the Rayleigh laser radar.

2. The middle atmosphere detection device according to claim 1, characterized in that: When the cloud layer height is greater than or equal to the height of the Rayleigh laser radar, the control device raises the height of the tethered balloon through the tethered cable controller of the tethered balloon, thereby raising the height of the Rayleigh laser radar.

3. The mid-level atmosphere detection device according to claim 1, characterized in that: The resultant force exerted by the mounting line on the mounting frame is on the same vertical line as the center of gravity of the Rayleigh laser radar; The mounting bracket is suitable for fixing the Rayleigh laser radar so that the emission light beam of the Rayleigh laser radar is at an oblique upward angle to detect the temperature and density of the middle atmosphere above the tethered balloon.

4. The middle atmosphere detection device according to claim 1, characterized in that: The Rayleigh laser radar comprises: a laser emitting unit, adapted to emit laser light toward the middle atmosphere; an optical receiving unit adapted to receive an echo signal based on backscattering of the laser from the middle atmosphere; The signal detection unit is adapted to obtain the detection data based on the echo signal.

5. The middle atmosphere detection device according to claim 4, characterized in that: The receiving field of view of the optical receiving unit is larger than the divergence angle of the laser emitting unit.

6. The middle atmosphere detection device according to claim 1, characterized in that: Also includes: An attitude detection device, mounted on the mounting frame, adapted to obtain attitude information of the Rayleigh laser radar; A control turntable is configured on the mounting frame and is suitable for adjusting the detection direction of the Rayleigh laser radar according to the posture information and a predetermined reference posture.

7. The middle atmosphere detection device according to claim 6, characterized in that: The center of gravity of the attitude detection device and the center of gravity of the Rayleigh laser radar are on the same vertical line.

8. The middle atmosphere detection device according to claim 6, characterized in that: Also includes: The ground station is adapted to obtain the temperature and density of the middle atmosphere according to the attitude information and the detection data.

9. The middle atmosphere detection device according to claim 8, characterized in that: The ground station comprises: The ground optical terminal is adapted to establish a first communication link between the ground station and the tethered balloon.

10. The middle atmosphere detection device according to claim 9, characterized in that: The tethered balloon comprises: A communication module is adapted to establish a second communication link between the Rayleigh lidar and the tethered balloon.

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