A transceiver device for a lidar

Abstract

The present invention discloses a transceiver device for a lidar. Specifically, the device includes: a transmitting light transmission system, a transmitting light collimation system, a receiving light collection system, and a receiving light transmission system; the transmitting light transmission system is configured to transmit the transmitting light emitted by a laser to the transmitting light collimation system through an optical fiber and an optical fiber array; the transmitting light collimation system is configured to collimate the transmitting light and then emit it to a scanning system; the receiving light collection system is configured to receive the echo light reflected back by the scanning system through the optical fiber array and transmit the echo light to the receiving light transmission system for the receiving light transmission system to transmit the echo light to a detector. By using the optical fiber array as the transmitting device for the transmitting light and the reference light and the receiving device for the receiving light at the receiving end, the present invention greatly facilitates the design layout and production and adjustment processes of the lidar, and greatly reduces the production cost.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of lidar, and in particular to a transceiver device of a lidar. Background Art

[0002] As the core component of a lidar, the design of the lidar transceiver device directly determines the basic architecture of the lidar.

[0003] Whether the scheme design is reasonable will affect the mass production cost and mass producibility of the lidar. When the lidar transceiver device is not set reasonably, there are problems such as affecting the optical indexes of the lidar, too small system tolerance of the lidar, inconvenient alignment, and poor mass producibility. Therefore, the lidar transceiver device has become the top priority in the design of the lidar system. Summary of the Invention

[0004] In order to solve the defects existing in the transceiver device of the lidar in the prior art, the present invention provides a transceiver device of a lidar, which greatly facilitates the design layout and production alignment process of the lidar, and greatly reduces the production cost.

[0005] The embodiments of the present invention provide a transceiver device of a lidar, including:

[0006] An emitted light transmission system, an emitted light collimation system, a received light collection system, and a received light transmission system;

[0007] Wherein, the emitted light transmission system is used to transmit the emitted light emitted by the laser through an optical fiber and an optical fiber array to the emitted light collimation system;

[0008] The emitted light collimation system is used to collimate the emitted light and then emit it to the scanning system;

[0009] The received light collection system is used to receive the echo light reflected back by the scanning system through the optical fiber array, and transmit the echo light to the received light transmission system for the received light transmission system to transmit the echo light to the detector.

[0010] Optionally, the emitted light transmission system includes: a main optical fiber, an optical fiber splitter connected to the main optical fiber, and a plurality of sub-optical fibers;

[0011] The main optical fiber is used to transmit the emitted light to the optical fiber splitter;

[0012] The optical fiber splitter is used to divide the emitted light into multiple beams of light, and the multiple beams of light are respectively transmitted to each channel of the optical fiber array of the emitted light collimation system through the plurality of sub-optical fibers.

[0013] Optionally, the emitted light collimation system includes a multi-channel fiber array, a collimating lens, and a collimation system reference board, and the multi-channel fiber array and the collimating lens are fixed on the collimation system reference board;

[0014] The multi-channel fiber array is used to emit the emitted light received by each channel to the collimating lens, and the collimating lens is used to collimate the emitted light and then emit it to the scanning system.

[0015] Optionally, the received light collection system includes: a converging lens and a multi-channel receiving fiber array, and the converging lens is used to converge the incident light of each channel and then emit it into the corresponding receiving channels of the multi-channel receiving fiber array respectively.

[0016] Optionally, it further includes a reference light transceiver system, and the reference light transceiver system includes: a reference light emitting fiber array and a reference light scattering system;

[0017] The reference light emitting fiber array is used to transmit the emitted light of the reference light to the reference light scattering system, and the reference light scattering system is used to scatter the emitted light of the reference light and then transmit it to the received light transmission system;

[0018] Wherein, the emitted light of the reference light is obtained by the emitted light transmission system leading out the emitted light emitted by the laser.

[0019] Optionally, the setting method of the reference light emitting fiber array includes:

[0020] Set separately, or coupled with the fiber array of the emitted light transmission system into the same fiber array, or coupled with the fiber array of the received light collection system into the same fiber array.

[0021] Optionally, it further includes a transceiver protection system arranged inside the transceiver device of the lidar, including a transmitting protection device and a receiving protection device;

[0022] The transmitting protection device is arranged outside the emitted light collimation system and houses the emitted light of the emitted light transmission system;

[0023] The receiving protection device is arranged outside the received light collection system and houses the incident light of the reference light and the incident light of the received light collection system.

[0024] Optionally, it further includes a transceiver device housing arranged outside the transceiver device of the lidar.

[0025] Optionally, each system and component are fixed by glue.

[0026] Advantages of the present invention:

[0027] (1) The transceiver device of the lidar described in the present invention realizes the core functions of lidar beam transceiver, such as the transmission, collimation of multiple outgoing light rays of the lidar, and the collection, convergence, separation, coupling and transmission of received light rays.

[0028] (2) The transceiver device of the lidar described in the present invention realizes the functions of transmission, scattering, reception, etc. of the internal reference light ray of the lidar.

[0029] (3) The present invention describes the use of an optical fiber array as the transmitting device for the transmitting light ray and the reference light ray, and the receiving device for the receiving light ray at the receiving end, which greatly facilitates the design layout and production assembly and adjustment process of the lidar, and greatly reduces the production cost.

[0030] (4) The reference light transceiver system described in the present invention greatly improves the calibration accuracy of the internal reference light ray of the system, and saves the cost of setting the reference light and the production cost.

[0031] (5) The protection device described in the present invention solves the problems of light ray scattering inside the lidar and large stray light interference, and at the same time ensures the cleanliness of the system.

[0032] (6) The transceiver device of the lidar described in the present invention specially adjusts the relative positions of each module and fixes them with glue, ensuring that the transceiver device can work normally at different detection distances. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the overall structure diagram of the lidar transceiver device provided by the embodiment of the present invention;

[0034] Figure 2 is the structural schematic diagram of the transmitted light ray collimation system provided by the embodiment of the present invention;

[0035] Figure 3 is the structural schematic diagram of the reference light transceiver system provided by the embodiment of the present invention;

[0036] Figure 4 is the structural schematic diagram of the received light ray collection system provided by the embodiment of the present invention;

[0037] Figure 5 is the structural schematic diagram of the emission protection device provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only the parts related to the present invention rather than all the structures are shown in the drawings for the sake of convenience of description. Embodiment

[0039] See Figures 1 - 5 , an embodiment of the present invention provides a transceiver device for a lidar, including: a transmitting light transmission system, a transmitting light collimation system, a reference light transceiver system, a receiving light collection system, a receiving light transmission system, a transceiver protection system, and a transceiver device housing.

[0040] See Figure 2 , the transmitting light transmission system is used to transmit the transmitting light emitted by the laser to the transmitting light collimation system through an optical fiber and an optical fiber array. Specifically, the transmitting light transmission system transmits the light emitted by the laser to the transmitting light collimation system through an optical fiber. Specifically, the transmitting light transmission system includes a main optical fiber, a one-to-many optical fiber splitter, and multiple sub-optical fibers. The main optical fiber is used to transmit the transmitting light to the optical fiber splitter; the optical fiber splitter is used to divide the transmitting light into multiple beams of light, and the multiple beams of light are respectively transmitted to each channel of the optical fiber array of the transmitting light collimation system through the multiple sub-optical fibers.

[0041] The transmitting light collimation system is used to collimate the transmitting light and then emit it to the scanning system. Specifically, the transmitting light collimation system includes a multi-channel optical fiber array, a collimating lens, and a collimation system reference plate; continue to see Figure 2 , the multi-channel optical fiber array and the collimating lens are fixed on the collimation system reference plate by glue, and the outgoing light is transmitted to the multi-channel optical fiber array through the optical fiber. After the transmitting optical fiber emits from the multi-channel optical fiber array, it is collimated by the collimating lens and then emitted to the scanning system. Among them, the collimation system reference plate is made of materials with relatively high stability, such as ceramics, special glass (quartz, etc.), metals and other materials.

[0042] Figure 3 is a reference light transceiver system, including a reference light emitting optical fiber array and a reference light scattering system; the reference light emitting optical fiber array is used to transmit the emitted light of the reference light to the reference light scattering system, and the reference light scattering system is used to scatter the emitted light of the reference light and then transmit it to the receiving light transmission system.

[0043] Among them, the transmitting light transmission system leads out other single or multiple beams of light emitted by the laser as the emitted light of the reference light. The emitted light of the reference light is transmitted into the system through the optical fiber array, and the reference light is scattered inside the system and then received by the receiving multi-channel optical fiber array.

[0044] The position of the reference light scattering system can be adjusted to ensure that the scattered reference light can return to each receiving channel evenly after emission; and the surface of the material used in the reference light scattering system can be treated to ensure uniform light scattering. The reference light emitting fiber array can be set independently, or coupled with the fiber array of the emission light transmission system into the same fiber array, or coupled with the fiber array of the received light collection system into the same fiber array. After being transmitted to the detector through the received light transmission system, it is used as the system calibration reference. The above setting of the reference light transceiver system greatly improves the accuracy of the internal reference light calibration of the system and saves the reference light setting cost and production cost.

[0045] See Figure 4 , the received light collection system includes a converging lens and a multi-channel receiving fiber array. The converging lens is used to converge the incident light of each channel and then emit it into the corresponding receiving channels of the multi-channel receiving fiber array respectively. Among them, the number of channels of the multi-channel receiving fiber array needs to be increased or decreased according to the usage requirements, and the number of receiving channels can be greater than or equal to the number of emission channels. By adjusting the position of the multi-channel receiving fiber array, it is ensured that sufficient light intensity can be received at different detection distances. To ensure the stability of the connection of the receiving fiber array and the accuracy and adjustability of the relative positions with the transmitting fiber array and the scattered light reflection system, first connect part of the structure in the receiving fiber array and the receiving protection system with glue, and then connect the structural parts in the receiving protection system with the receiving system with glue. The received light collection system in this embodiment also has a certain sealing effect, which can ensure the cleanliness of the emission collimation system.

[0046] The transceiver protection system includes an emission protection device and a receiving protection device arranged inside the transceiver device of the lidar. Among them, the emission protection device is arranged outside the emission light collimation system and houses the emitted light of the emission light transmission system; the receiving protection device is arranged outside the received light collection system and houses the incident light of the reference light and the incident light of the received light collection system. The above emission protection device and receiving protection device are provided with openings at the light incident and emission ports.

[0047] Specifically see Figure 5, The emission protection device is a protective cover that can block light and dust, and can be made of metal parts or plastic parts. In order to prevent the emission optical fiber from scattering in the system, the surface of the optical fiber protection device can be coated with an anti-reflection coating or other methods to reduce the surface reflectivity. At the same time, the emission protection device has a certain sealing effect, which can ensure the cleanliness of the emission collimation system. The emission protection system is fixed to the collimation system reference board through glue and buckles. Further, it also includes a transceiver device housing arranged outside the device. The above arrangement of the protection transceiver system solves the problem of light scattering inside the lidar and large interference from stray light, and ensures the cleanliness of the system.

[0048] Optionally, the multi-channel optical fiber array involved in the above embodiment of the present invention needs to be coated with a film or glued to a coated planar lens to improve the end-face optical performance; the converging lens and the collimating lens need to be made into special-shaped trimmed lenses according to requirements, and the optical performance is improved through coating.

[0049] The technical solution of the embodiment of the present invention realizes the core functions of the lidar beam transceiver, such as the transmission and collimation of multiple outgoing light rays of the lidar, and the collection, convergence, separation, coupling and transmission of the received light rays; it also realizes the functions of the transmission, scattering and reception of the internal reference light rays of the lidar; by using the optical fiber array as the emission device for the emission light rays and reference light rays at the emission end and the reception device for the received light rays at the reception end, it greatly facilitates the lidar design layout and production assembly and adjustment process, and greatly reduces the production cost; in addition, in the present invention, the transceiver device of the lidar adjusts the relative positions of each module and fixes them with glue, ensuring that the transceiver device can work normally at different detection distances.

[0050] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A transceiver device of a lidar, characterized in that, Comprising: An emission light transmission system, an emission light collimation system, a received light collection system, a received light transmission system, and a reference light transceiver system; Wherein, the emission light transmission system is used to transmit the emission light emitted by the laser to the emission light collimation system through an optical fiber and an optical fiber array; The emission light collimation system is used to collimate the emission light and then emit it to the scanning system; The received light collection system is used to receive the echo light reflected back by the scanning system through an optical fiber array, and transmit the echo light to the received light transmission system for the received light transmission system to transmit the echo light to the detector. The reference light transceiver system includes: a reference light emission optical fiber array and a reference light scattering system; the reference light emission optical fiber array is used to transmit the emitted light of the reference light to the reference light scattering system, and the reference light scattering system is used to scatter the emitted light of the reference light inside the reference light scattering system and then transmit it to the received light transmission system. Wherein, the reference light scattering system is configured to be position adjustable and processed to uniformly scatter the reference light, so that the emitted reference light is uniformly returned to each receiving channel in the received light collection system after scattering.

2. The device according to claim 1, characterized in that, The emission light transmission system includes: a main optical fiber, an optical fiber splitter connected to the main optical fiber, and multiple sub-optical fibers; The main optical fiber is used to transmit the emission light to the optical fiber splitter; The optical fiber splitter is used to divide the emission light into multiple beams of light, and the multiple beams of light are respectively transmitted to each channel of the emission light collimation system optical fiber array through the multiple sub-optical fibers.

3. The device according to claim 1, characterized in that, The emission light collimation system includes: a multi-channel optical fiber array, a collimation lens, and a collimation system reference plate, and the multi-channel optical fiber array and the collimation lens are fixed on the collimation system reference plate; The multi-channel optical fiber array is used to emit the emitted light received by each channel to the collimation lens, and the collimation lens is used to collimate the emitted light and then emit it to the scanning system.

4. The device according to claim 1, characterized in that, The received light collection system includes: a converging lens and a multi-channel receiving optical fiber array, and the converging lens is used to converge the incident light of each channel and then emit it to the corresponding receiving channel of the multi-channel receiving optical fiber array respectively.

5. The device according to claim 1, characterized in that, The emitted light of the reference light is obtained by the emission light transmission system leading out the emitted light emitted by the laser.

6. The device according to claim 5, characterized in that The setting method of the reference light emission optical fiber array includes: being set separately, or being coupled with the optical fiber array of the emission light transmission system into the same optical fiber array, or being coupled with the optical fiber array of the received light collection system into the same optical fiber array.

7. The device according to claim 1, characterized in that, It further includes a transceiver protection system arranged inside the transceiver device of the lidar, including an emission protection device and a reception protection device; The emission protection device is arranged outside the emission light collimation system and houses the emitted light of the emission light transmission system; The reception protection device is arranged outside the received light collection system and houses the incident light of the reference light and the incident light of the received light collection system.

8. The device according to claim 1, characterized in that, It further includes a transceiver housing disposed outside the transceiver of the lidar.

9. The device according to any one of claims 1-7, characterized in that, Fix each system and component by glue.

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