Light and small laser wind-finding radar device of aerostat platform

Abstract

The utility model provides a light and small laser wind-finding radar device for an aerostat platform, and the device comprises a laser light source which is used for generating a pulse light beam with preset energy and preset frequency; the transmitting-receiving optical system comprises a step-shaped wedge mirror or a holographic optical element, is arranged on an emergent path of the pulse light beam and is used for transmitting the pulse light beam according to a forward conical scanning mode and receiving an echo signal of the pulse light beam; and the laser detector is arranged on an incident path after the echo signal passes through the transceiving optical system, and is used for detecting the echo signal to obtain the frequency shift of the echo signal.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind field observation, and in particular to a light and small laser wind measurement radar device on an aerostat platform. Background Art

[0002] Wind field is an important observation indicator in many scientific fields such as meteorology and aerodynamics. The technical disadvantages of traditional wind measurement methods include narrow detection range and poor resolution. Laser wind radar uses the Doppler frequency shift of the backscattered signal of the outgoing laser through aerosol or gas molecules to invert the wind speed, and then inverts the wind direction through the wind speed information observed from multiple angles. It has the application advantages of high measurement accuracy, long detection distance, high temporal and spatial resolution, and has shown great application potential in the fields of aviation safety, wind energy utilization and meteorological observation.

[0003] In order to collect wind field information above, below, and in front of the platform, the laser radar device needs to design a specific scanning mode, and also needs to design a specific mechanical structure to constrain the beam path to achieve the established scanning mode. Existing laser wind radars generally use a two-axis steering mechanism or a wedge-shaped prism. The two-axis steering mechanism is large in size and weight, and the thickness of the wedge-shaped mirror increases linearly with the expansion of the receiving aperture, which cannot meet the requirements of lightness. In addition, the platform equipped with the laser radar device has translational motion and attitude changes, which will affect the accuracy of Doppler velocity measurement in principle. In order to achieve high-precision wind field measurement, the existing solution generally uses an aviation stabilized platform to carry the radar. The platform is large in size and weight, and has high power consumption, which cannot meet the lightweight application requirements of the airship platform. Summary of the invention

[0004] In view of the above problems, the present invention provides a lightweight laser wind measurement radar device for an aerostat platform to solve the above technical problems.

[0005] The first aspect of the present disclosure provides a lightweight laser wind measurement radar device for an aerostat platform, comprising: a laser light source, used to generate a pulse light beam with preset energy and preset frequency; a transceiver optical system, including a step-shaped wedge mirror or a holographic optical element, arranged on the exit path of the pulse light beam, used to emit the pulse light beam in a forward conical scanning mode and receive the echo signal of the pulse light beam; a laser detector, arranged on the incident path of the echo signal after passing through the transceiver optical system, used to detect the echo signal and obtain the frequency shift of the echo signal.

[0006] According to an embodiment of the present disclosure, it also includes: a controller, which is used to rotate the step-shaped wedge mirror or the holographic optical element to make the pulse light beam deflect and converge.

[0007] According to an embodiment of the present disclosure, the step-shaped wedge mirror includes a central ordinary wedge mirror and a step-shaped wedge mirror, the central ordinary wedge mirror is inserted into the through hole at the center of the step-shaped wedge mirror, its bottom surface is located in the same plane as the bottom surface of the step-shaped wedge mirror, and its inclined surface extends out of the through hole; the upper surface of the step-shaped wedge mirror is provided with a plurality of steps parallel to each other, the heights of the steps are consistent, and one side of the step is consistent with the direction and angle of the inclined surface of the central ordinary wedge mirror.

[0008] According to an embodiment of the present disclosure, the pulse laser is emitted from the central ordinary wedge mirror.

[0009] At least one of the above technical solutions adopted in the embodiments of the present disclosure can achieve the following beneficial effects:

[0010] The present disclosure provides a lightweight laser wind measurement radar device for an aerostat platform. Compared with the traditional method of using a mechanical shaft or a rotating ordinary wedge-shaped prism, the present disclosure uses a stepped wedge mirror with an ordinary wedge-shaped prism in the center and independent wedge-shaped prisms with the same angle as the center but separated in a step shape at the edges, which effectively reduces the overall thickness of the prism. The device can also use holographic optical elements to achieve light deflection, all of which realize the lightweight and miniaturization of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] For a more complete understanding of the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

[0012] Figure 1 A schematic diagram of the structure of a light and small laser wind measurement radar device on an aerostat platform provided by an embodiment of the present disclosure is shown;

[0013] Figure 2 A schematic diagram of a scanning mode of a light and small laser wind measurement radar device of an aerostat platform provided by an embodiment of the present disclosure is schematically shown;

[0014] Figure 3 A schematic diagram of a scanning mode implementation method of a light and small laser wind measurement radar device of an aerostat platform provided by an embodiment of the present disclosure is schematically shown;

[0015] Figure 4A A schematic diagram of a step-shaped wedge mirror provided by an embodiment of the present disclosure is schematically shown;

[0016] Figure 4B A cross-sectional view of a stepped wedge mirror provided by an embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0018] 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 existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0019] All terms (including technical and scientific terms) used herein 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.

[0020] Some block diagrams and / or flow charts are shown in the accompanying drawings. It should be understood that some blocks or combinations thereof in the block diagrams and / or flow charts may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that these instructions, when executed by the processor, may create a device for implementing the functions / operations described in these block diagrams and / or flow charts.

[0021] Figure 1 The schematic diagram of the structure of a lightweight laser wind measurement radar device on an aerostat platform provided by an embodiment of the present disclosure is shown schematically.

[0022] like Figure 1 As shown, the present disclosure provides a light and small laser wind measurement radar device for an aerostat platform, including: a laser light source 110, a transceiver optical system 120 and a laser detector 130.

[0023] The laser light source 110 is used to generate a pulse light beam with preset energy and preset frequency.

[0024] The transceiver optical system 120 includes a stepped wedge mirror or a holographic optical element, which is disposed on the emission path of the pulse light beam and is used to emit the pulse light beam in a forward conical scanning mode and receive the echo signal of the pulse light beam.

[0025] The laser detector 130 is disposed on the incident path of the echo signal after it passes through the transceiver optical system 120 , and is used to detect the echo signal and obtain the frequency shift of the echo signal.

[0026] In addition, the device may also include a processor 140, which is connected to the laser detector 130 and is used to perform motion compensation based on the echo information and other sensor information and the basic principle of Doppler wind measurement to obtain wind field vector information at different positions.

[0027] Figure 2 A schematic diagram of a scanning mode of a lightweight laser wind measurement radar device on an aerostat platform provided by an embodiment of the present disclosure is schematically shown.

[0028] like Figure 2 Therefore, the light and small laser wind measurement radar device for an aerostat platform provided in the embodiment of the present disclosure is carried on the aerostat platform, and the aerostat platform can be a hot air balloon, an airship, etc. In this embodiment, the light and small laser wind measurement radar device for an aerostat platform also includes a controller for realizing the movement of the emitted light on the cone surface to realize the wind field vector measurement above, below and in front of the platform.

[0029] When the aerostat measures the wind field above, the control mechanism emits a light beam on the upper half of the cone, such as Figure 2 Direction 1 and direction 2 in the figure can realize the measurement of different heights of the upper wind field under the assumption that there is only a horizontal wind field and the wind field is uniform at the same height; when the aerostat measures the wind field below, the control mechanism emits a light beam on the lower half of the cone, such as Figure 2 Directions 5 and 6 in the figure can realize the measurement of different heights of the wind field below under the assumption that there is only a horizontal wind field and the wind field is uniform at the same height; when the aerostat measures the wind field directly in front, the control mechanism emits a light beam on the horizontal plane, such as Figure 2 In directions 3 and 4, under the assumption that there is only a horizontal wind field and the wind field is uniform at the same height, the wind field directly in front of the platform can be measured.

[0030] In this embodiment, the above scanning mode can be realized through two structures to ensure the portability of the laser wind measurement radar of this type of aerostat platform.

[0031] Figure 3 A schematic diagram of a scanning mode implementation method of a lightweight laser wind measurement radar device on an aerostat platform provided by an embodiment of the present disclosure is schematically shown.

[0032] like Figure 3 As shown, the controller can adjust the deflection of the pulsed light beam by rotating the step-shaped wedge mirror. On the other hand, the controller can adjust the deflection of the pulsed light beam by rotating the holographic optical element. When the holographic optical element or the step-shaped wedge mirror rotates around the central axis of the cone to be scanned, the emitted light can be moved on the cone surface.

[0033] Figure 4A and Figure 4B A schematic diagram and a cross-sectional diagram of a step-shaped wedge mirror provided by an embodiment of the present disclosure are schematically shown respectively.

[0034] like Figure 4A and Figure 4B As shown, the step-shaped wedge mirror includes a central ordinary wedge mirror 41 and a step-shaped wedge mirror 42. The central ordinary wedge mirror 41 is inserted into the through hole at the center of the step-shaped wedge mirror 42, and its bottom surface is located in the same plane as the bottom surface of the step-shaped wedge mirror 42, and its inclined surface extends out of the through hole; the upper surface of the step-shaped wedge mirror 42 is provided with a plurality of mutually parallel steps, the heights of the steps are consistent, and one side of the step is consistent with the direction and angle of the inclined surface of the central ordinary wedge mirror 41. The step-shaped wedge mirrors 42 separated on all sides effectively reduce the thickness of the prism as a whole. The laser is emitted from the central ordinary wedge mirror 41 to ensure the quality of the beam, and the reflected echo is incident from the entire step-shaped wedge mirror. The step-shaped prism realizes beam deflection as a whole. When it rotates around the central axis of the cone to be scanned, the emitted light can be moved on the cone surface.

[0035] The light and small laser wind measurement radar device for an aerostat platform provided in the embodiment of the present disclosure can realize a scanning method for measuring the wind field above, below and directly in front of the aerostat platform, specifically: a forward conical scanning method, providing effective observation of the wind field above, below and directly in front. The device uses a scanning structure of a holographic optical element or a stepped wedge mirror, realizing the lightness and miniaturization of the device.

[0036] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0037] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, it should be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A small laser wind measurement radar device for an aerostat platform, characterized in that: include: A laser light source, used to generate a pulsed light beam with a preset energy and a preset frequency; a transceiver optical system, comprising a step-shaped wedge mirror or a holographic optical element, disposed on the emission path of the pulse light beam, for emitting the pulse light beam in a forward conical scanning mode and receiving an echo signal of the pulse light beam; The laser detector is arranged on the incident path of the echo signal after it passes through the transceiver optical system, and is used to detect the echo signal and obtain the frequency shift of the echo signal.

2. The device according to claim 1, characterized in that Also includes: The controller is used to control the rotation of the stepped wedge mirror or the holographic optical element so as to cause the pulse light beam to be angularly deflected and converged.

3. The device according to claim 1, characterized in that The step-shaped wedge mirror comprises a central common wedge mirror and a step-shaped wedge mirror, wherein the central common wedge mirror is inserted into a through hole at the center of the step-shaped wedge mirror, and its bottom surface is located in the same plane as the bottom surface of the step-shaped wedge mirror, and its inclined surface extends out of the through hole; The upper surface of the stepped wedge mirror is provided with a plurality of steps parallel to each other, the heights of the steps are consistent, and one side of the step is consistent with the direction and angle of the inclined surface of the central ordinary wedge mirror.

4. The device according to claim 3, characterized in that The pulsed light beam is emitted from the central ordinary wedge mirror.

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