A laser radar device and detection system based on split lens

Abstract

The present invention provides a split-lens laser radar device, comprising a laser transmitter, an echo signal receiver, a lens, and a baffle. The laser transmitter and the echo signal receiver are respectively arranged on either side of the baffle. The baffle divides the lens into two half-lenses, one half of which serves as the transmitting lens for the laser transmitter, and the other half of which serves as the receiving lens for the echo signal receiver. The present invention utilizes a split, large-aperture half-lens design to achieve a high signal-to-noise ratio. A small separation between the transmitter and receiver reduces detection blind spots. The transmitter and receiver are fully optically isolated, improving detection sensitivity. A reduced number of optical calibration components is used to achieve optical path collimation and focusing. The modular split design results in low overall energy consumption, portability, and ease of installation and maintenance. The device features a compact structure, a miniaturized appearance, and an adjustable base angle for detection in various directions.

Description

Technical Field

[0001] The present invention relates to the field of laser radar technology, and in particular to a laser radar device and detection system based on a split lens. Background Art

[0002] At present, general off-axis laser radars have a large gap between the transmitting device and the receiving device, which results in a large blind spot and requires a certain distance to achieve complete overlap. General coaxial laser radars, although they can reduce the blind spot, do not have complete optical isolation between the transmitting device and the receiving device, which is more likely to cause near-field saturation. In addition, they are affected by the obstruction caused by related mechanical parts, making it impossible to minimize the detection blind spot and maximize the signal-to-noise ratio.

[0003] The laser at the transmitting end of existing lidar devices is large in size, high in cost, and has a complex drive system; the telescope aperture of the receiving device is often several times larger than that of the transmitting device; the transmitting and receiving devices require a certain number of optical elements for beam expansion and collimation of the light path, and the laser at the transmitting end and the detector at the receiving end are large in size. The distance between the transmitting and receiving ends cannot be made very small, resulting in a large size of the entire optical system and the lidar equipment looking relatively large and bulky. Summary of the Invention

[0004] The present invention provides a laser radar device and detection system based on a split lens. By splitting a large-aperture lens into two halves along the center line as a transmitting device and a receiving device respectively, the detection signal-to-noise ratio can be improved; the transmitting end adopts a smaller and lower-cost laser, and the receiving end adopts a photodetector, which can reduce the distance between the transmitting device and the receiving device, thereby effectively reducing the detection blind spot; at the same time, the light transmitting and receiving paths are completely isolated by a baffle, which can avoid near-field saturation; the overall volume and weight of the equipment are reduced, which is portable and reduces the overall cost of the product; the modular design of each component realizes low power consumption of the entire device, and can accurately obtain cloud height, cloud amount, aerosol distribution and other conditions within the measurement range, changing the current situation of atmospheric detection laser radar being bulky and expensive, and can accelerate the popularization and utilization of atmospheric detection laser radar equipment nationwide.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: including a laser emitting device 11, an echo signal receiving device 12, a lens and a baffle 3, wherein the laser emitting device 11 and the echo signal receiving device 12 are respectively arranged on both sides of the baffle 3, and the baffle 3 is arranged on the lens. The baffle 3 divides the lens into two half lenses, wherein half of the lens serves as an emitting lens 201 of the laser emitting device, and the other half of the lens serves as a receiving lens 202 of the echo signal receiving device.

[0006] Preferably, the laser emitting device 11 includes a beam expander collimator 22, a laser 20 for emitting laser pulses, and a first filter 21; the echo signal receiving device 12 includes a detector 23, an optical telescope 25, and a second filter 24; the second filter 24 is arranged between the detector 23 and the optical telescope 25; and further includes a signal acquisition device 13; the signal acquisition device 13 includes a data acquisition card 26 and an embedded board 27; the data acquisition card 26 is respectively connected to the laser 20, the detector 23, and the embedded board 27; the embedded board 27 is respectively connected to the detector 23 and the laser 20.

[0007] Preferably, the laser 20 is arranged at the focus of the transmitting lens 201 , and the detector 23 is arranged at the focus of the receiving lens 202 .

[0008] Preferably, an optical fiber 4 is further included, and the optical fiber 4 is connected to the laser 20 and the detector 23 respectively. The end faces of the optical fiber 4 are respectively arranged at the focal points of the emitting lens 201 and the receiving lens 202.

[0009] Preferably, it also includes a base with adjustable angle.

[0010] Preferably, the laser emitting device 11, the echo signal receiving device 12 and the signal collecting device 13 all adopt a modular design.

[0011] A detection system comprises any of the above-mentioned split-lens based laser radar devices.

[0012] By implementing the above technical solution, the following technical effects are achieved: the laser radar device and detection system based on the split lens provided by the present invention adopt an innovative split lens design, which divides a large-aperture lens into two half-lenses from the center line through a baffle, one half of which serves as the transmitting lens of the laser transmitting device, and the other half as the receiving lens of the echo signal receiving device. The laser transmitting device and the echo signal receiving device of the two devices have consistent focal lengths; the transmitting laser and the receiving detector are respectively placed at the focus of the two half-lenses, and no additional optical elements are required to calibrate the light receiving and light transmission paths, which can minimize the number of optical elements; the lens The lens has a large aperture, which can improve the optical signal-to-noise ratio; the laser and detector are small in size, and the interval is greatly reduced, which can reduce the detection blind area and maximize the overlapping factor; the laser emitting device and the echo signal receiving device are completely isolated by a baffle, which can effectively prevent light leakage; each component adopts a modular design, which is easy to install and maintain, and the overall device can achieve low power consumption; each device takes up less space, has a compact structure, and is small in size and light in weight, which is convenient for transportation and for operators to lift and install; unmanned, all-weather measurement can be achieved, and the measurement results are automatically uploaded to the cloud platform and shared with the client's intelligent effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a portion of the structure of the laser radar device provided by the present invention;

[0014] Figure 2 A schematic diagram of a portion of the structure of a laser radar device with an optical fiber added provided by the present invention;

[0015] Figure 3 This is a schematic diagram of the architecture of the detection system provided by the present invention. DETAILED DESCRIPTION

[0016] In order to better understand the technical solution of the present invention, the embodiments provided by the present invention are described in detail below with reference to the accompanying drawings.

[0017] The present invention provides a laser radar device based on a split lens, as shown in the attached Figure 1-2 As shown, it includes a laser emitting device 11, an echo signal receiving device 12, a lens and a baffle 3. In this embodiment, preferably, the lens is a large-aperture lens, and the lens can be a spherical lens or an aspherical lens. The lens has a large aperture, and the baffle 3 is arranged on the lens. The baffle 3 divides the lens into two half-lenses. This embodiment adopts a split large-aperture half-lens design to achieve a higher signal-to-noise ratio.

[0018] The laser emitting device 11 and the echo signal receiving device 12 are respectively arranged on both sides of the baffle 3, so as to realize a smaller distance between the emitting device and the receiving device, thereby reducing the detection blind spot; the baffle 3 divides the lens into two half lenses, wherein half of the lens serves as the emitting lens 201 of the laser emitting device, and the other half of the lens serves as the receiving lens 202 of the echo signal receiving device. The baffle 3 realizes complete optical isolation between the emitting device and the receiving device, thereby improving the detection sensitivity.

[0019] On the basis of the above embodiments, in other embodiments, further, the laser emitting device 11 includes a beam expander collimator 22, a laser 20 for emitting laser pulses and a first filter 21, and the echo signal receiving device 12 includes a detector 23, an optical telescope 25 and a second filter 24, and the second filter 24 is arranged between the detector 23 and the optical telescope 25.

[0020] The laser radar device based on the split lens further includes a signal acquisition device 13, such as Figure 3As shown, the laser emitting device 11 is used to emit a pulsed laser beam, the echo signal receiving device 12 is used to receive the backscattered signal of the laser by the atmosphere and convert the optical signal into an electrical signal, and the signal acquisition device 13 is used to receive the above-mentioned electrical signal. In this embodiment, more specifically, the signal acquisition device 13 includes a data acquisition card 26 and an embedded board 27. The data acquisition card 26 is respectively connected to the laser 20, the detector 23, and the embedded board 27 for signal communication, and the embedded board 27 is respectively connected to the detector 23 and the laser 20 for signal communication. The beam expander collimator 22 collimates and expands a single-pulse microjoule laser beam. The power density of the expanded laser on any cross section perpendicular to the propagation direction meets the laser eye safety standard, ensuring eye safety.

[0021] On the basis of the above embodiments, in other embodiments, further, as Figure 1 As shown, the laser 20 is positioned at the focal point of the transmitting lens 201, and the detector 23 is positioned at the focal point of the receiving lens 202. This ensures focal length consistency between the transmitting and receiving devices, reduces the distance between the laser 20 and the detector 23, eliminates the need for additional optical elements to calibrate the light-receiving and light-receiving paths, and minimizes the number of optical elements. The laser 20 emits a laser beam at the focal point of the transmitting lens 201. After passing through the transmitting lens 201, it is collimated into emitted light. After interacting with particles in the atmosphere, the emitted light generates a backscattered echo signal. The echo signal is the backscattered beam generated by the interaction of the emitted light with the particles in the atmosphere. After passing through the receiving lens 202, the echo signal is focused to the focal point of the receiving lens 202 and received by the detector 23. In this embodiment, the laser 20 is preferably a laser that emits microjoule-level high-repetition-rate optical pulses. The high repetition rate can improve the signal-to-noise ratio and detect signals at longer distances.

[0022] On the basis of the above embodiments, in other embodiments, in order to further reduce the distance between the laser 20 and the detector 23, as shown in FIG. Figure 2 As shown, an optical fiber 4 is provided to connect the laser 20 and the detector 23, respectively. The end faces of the optical fiber 4 are respectively arranged at the focal points of the transmitting lens 201 and the receiving lens 202. Utilizing the beam guiding function of the optical fiber 4, the laser beam emitted by the laser 20 is guided through the optical fiber 4 to the focal point of the transmitting lens 201, and the echo signal passing through the receiving lens 202 is guided through the optical fiber to the detector 23. This further reduces the separation distance between the transmitting device and the receiving device, thereby effectively reducing the detection blind spot.

[0023] On the basis of the above embodiments, other embodiments further include a base with adjustable angle, and by adjusting the angle of the base, cloud height and cloud amount detection in different directions, as well as the generation and dissipation process of aerosols can be achieved. In this embodiment, preferably, the laser emitting device 11, the echo signal receiving device 12 and the signal acquisition device 13 all adopt a modular design, and the overall device can achieve low power consumption, the laser and the detector are small in size, each device occupies less space, the structure is compact, the overall volume is small, the manufacturing cost is low, and it is portable and easy to install and maintain. The laser radar device has an IP65 (Ingress Protection 65) protection grade, and its casing has been treated with anti-corrosion to adapt to outdoor environmental conditions of wind, frost, rain and snow.

[0024] A detection system includes the split-lens-based lidar device described in any of the above embodiments. The detection system further includes a communication system and a power supply system. The communication system is either a wireless or wired data transmission system, the wireless data transmission system including a GPRS (General Packet Radio Service) communication module or a WiFi (Wi-Fi) network module, and the wired data transmission system is a network cable, serial cable, or optical fiber. The power supply system is a mains power grid, or utilizes wind power, solar power, or a wind-solar hybrid system.

[0025] The above is a detailed introduction to a split-lens-based laser radar device and detection system provided in an embodiment of the present invention. For those skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A laser radar device based on a split lens, characterized in that: The invention comprises a laser emitting device (11), an echo signal receiving device (12), a lens and a baffle (3), wherein the laser emitting device (11) and the echo signal receiving device (12) are respectively arranged on both sides of the baffle (3), the baffle (3) is arranged on the lens, and the baffle (3) divides the lens into two half lenses, wherein the half lens serves as an emitting lens (201) of the laser emitting device, and the other half lens serves as a receiving lens (202) of the echo signal receiving device; The laser emitting device (11) comprises a beam expander collimator (22), a laser (20) for emitting laser pulses, and a first filter (21); the echo signal receiving device (12) comprises a detector (23), an optical telescope (25), and a second filter (24); the second filter (24) is arranged between the detector (23) and the optical telescope (25); The device further comprises a signal acquisition device (13), wherein the signal acquisition device (13) comprises a data acquisition card (26) and an embedded board (27), wherein the data acquisition card (26) is respectively connected to the laser (20), the detector (23) and the embedded board (27) for signal communication, and the embedded board (27) is respectively connected to the detector (23) and the laser (20) for signal communication. The laser (20) is arranged at the focus of the transmitting lens (201), and the detector (23) is arranged at the focus of the receiving lens (202); It also includes an optical fiber (4), which is connected to the laser (20) and the detector (23) respectively, and the end faces of the optical fiber (4) are respectively arranged at the focal points of the emitting lens (201) and the receiving lens (202).

2. The laser radar device based on the split lens according to claim 1, characterized in that Also includes an angle-adjustable base.

3. The laser radar device based on the split lens according to claim 1, characterized in that The laser emitting device (11), the echo signal receiving device (12) and the signal collecting device (13) all adopt a modular design.

4. A detection system, characterized in that: A laser radar device based on a split lens comprising any one of claims 1-3.

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