Laser radar structure

Abstract

The utility model discloses a laser radar structure, which comprises a spatial light modulator, a light beam splitter, a liquid crystal regulator and an optical lens, and the liquid crystal modulator comprises a liquid crystal layer, and the upper side and the lower side of the liquid crystal layer are provided with transparent electrodes and glass substrates; the liquid crystal adjuster, the spatial light modulator, the light beam splitter and the optical lens are sequentially arranged according to the passing sequence of light beams; according to the utility model, through the liquid crystal optical phased array and spatial light modulation, the application scene cost is reduced, and the product production becomes simple and rapid; different electric field intensities enable the liquid crystal crystal to rotate to different degrees, so that the refractive index of the liquid crystal crystal is changed, the purpose of modulating the phase of a light beam is achieved, light beam scanning is finally achieved, the polarization, the phase and the intensity of the light are changed through the spatial light modulator, the intensity and the wavelength of the transmitted or reflected light are changed, and the scanning function is enhanced. And the scanning precision is higher by using the light beam splitter.

Description

Technical Field

[0001] The utility model relates to the technical field related to laser radar, and specifically to a laser radar structure. Background Art

[0002] With the rapid development of China's LiDAR market. In recent years, it has gradually been applied in the field of intelligent driving of automobiles, and is expected to become the core key sensor of autonomous driving. LiDAR has the characteristics of detecting scattered light of distant targets to obtain target information, and has the advantages of high precision, high temporal and spatial resolution, etc. The radar uses laser as the carrier, and the wavelength is shorter than the millimeter wave, so the detection accuracy is high and the distance is long. LiDAR can form a 3D "point cloud" image of obstacles by recovering the information of laser rulers in different directions, forming lines from points and surfaces from lines. Traditional LiDAR is mainly mechanical scanning radar, but the scanner rotation rate of mechanical scanning radar limits the imaging speed and frame rate. At the same time, the control accuracy and steering flexibility of the system are limited by the inertial scanning method, which makes it difficult to meet the high-performance detection requirements, and the service life is short. As a new optical scanning technology, silicon-based optical phased array has the advantages of small size, flexible pointing, fast scanning speed, low power consumption, high precision, and compatibility with CMOS process compared with mechanical scanning LiDAR, but the cost is high and the production difficulty is high. Utility Model Content

[0003] In order to solve the defects in the prior art, the utility model provides a laser radar structure.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] The utility model discloses a laser radar structure, comprising a spatial light modulator, a beam splitter, a liquid crystal modulator and an optical lens, wherein the liquid crystal modulator comprises a liquid crystal layer, upper and lower sides of which are both provided with transparent electrodes and a glass substrate; and the liquid crystal modulator, the spatial light modulator, the beam splitter and the optical lens are arranged in sequence according to the order in which the light beams pass through.

[0006] As a preferred technical solution of the utility model, it also includes a signal receiver, and the signal receiver is used to receive the scanning light beam of the scanned object and confirm the size and position of the scanned object.

[0007] As a preferred technical solution of the utility model, when the transparent electrode has no voltage, the liquid crystal crystals in the liquid crystal layer are arranged in parallel.

[0008] As a preferred technical solution of the utility model, when a voltage is applied to the transparent electrode, the liquid crystal crystals in the liquid crystal layer rotate at a certain angle.

[0009] As a preferred technical solution of the present utility model, the model of the spatial light modulator is LCOS-SLMX10468-02.

[0010] As a preferred technical solution of the utility model, the optical lens is a convex lens.

[0011] As a preferred technical solution of the present utility model, the model of the signal receiver is WK399-IP-210.

[0012] The beneficial effects of the utility model are:

[0013] In this new laser radar structure, a liquid crystal modulator is set. When there is no voltage in the liquid crystal layer, the liquid crystal crystals are arranged in parallel. As the voltage gradually increases and reaches the threshold voltage, the liquid crystal crystals will rotate at a certain angle. Since the crystals will produce birefringence under the action of the electric field, different electric field strengths will cause the liquid crystals to rotate to different degrees, thereby changing their refractive index, achieving the purpose of phase modulation of the light beam, and finally realizing light beam scanning. The polarization, phase and intensity of the light are changed by the spatial light modulator, and the intensity and wavelength of the light transmitted or reflected are changed, the scanning function is enhanced, and the optical beam splitter is used to make the scanning accuracy higher. In addition, the utility model has the advantages of light weight, low drive, and low power consumption. This utility model patent can solve the problems of high cost and excessive performance of laser radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a structural schematic diagram of a laser radar structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of a liquid crystal modulator of a laser radar structure of the utility model

[0017] In the figure: 1. spatial light modulator; 2. optical beam splitter; 3. signal receiver; 4. liquid crystal modulator; 5. optical lens; 6. liquid crystal layer; 7. transparent electrode; 8. glass substrate. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] Example: Figure 1 and Figure 2As shown, the utility model is a laser radar structure, including a spatial light modulator 1, a beam splitter 2, a liquid crystal modulator 4 and an optical lens 5, wherein the model of the spatial light modulator 1 is LCOS-SLM X10468-02; and the liquid crystal modulator 4 includes a liquid crystal layer 6, and transparent electrodes 7 and a glass substrate 8 are provided on both sides thereof; and the liquid crystal modulator 4, the spatial light modulator 1, the beam splitter 2 and the optical lens 5 are arranged in sequence according to the order in which the light beam passes. By setting the liquid crystal modulator, when the liquid crystal layer 6 has no voltage, the liquid crystal crystals are arranged in parallel, and as the voltage gradually increases and reaches the threshold voltage, the liquid crystal crystals will rotate at a certain angle, and since the crystals will produce birefringence under the action of the electric field, different electric field intensities will cause the liquid crystal crystals to rotate to different degrees, thereby changing their refractive index, achieving the purpose of phase modulation of the light beam, and finally realizing light beam scanning, changing the polarization, phase and intensity of the light through the spatial light modulator 1, changing the intensity and wavelength of the light transmitted or reflected, enhancing the scanning function, and using the beam splitter 2 to make the scanning accuracy higher. In addition, the utility model has the advantages of light weight, low drive, low power consumption, etc. This utility model patent can solve the drawbacks of high cost and excessive performance of laser radar.

[0020] It also includes a signal receiver 3, which is used to receive a scanning light beam of the scanned object and confirm the size and position of the scanned object; the model of the signal receiver 3 is WK399-IP-210.

[0021] When the transparent electrode 7 has no voltage, the liquid crystals in the liquid crystal layer 6 are arranged in parallel. When the transparent electrode 7 has a voltage applied, the liquid crystals in the liquid crystal layer 6 rotate at a certain angle.

[0022] The optical lens 5 is a convex lens, which is convenient for scanning.

[0023] Working principle: By setting up a liquid crystal modulator, when there is no voltage in the liquid crystal layer 6, the liquid crystal crystals are arranged in parallel. As the voltage gradually increases and reaches the threshold voltage, the liquid crystal crystals will rotate at a certain angle. Since the crystals will produce birefringence under the action of the electric field, different electric field strengths will cause the liquid crystals to rotate to different degrees, thereby changing their refractive index, achieving the purpose of phase modulation of the light beam, and finally realizing light beam scanning. The spatial light modulator 1 changes the polarization, phase and intensity of the light, changes the intensity and wavelength of the light transmitted or reflected, strengthens the scanning function, and uses the optical beam splitter 2 to make the scanning accuracy higher. In addition, the utility model has the advantages of light weight, low drive, and low power consumption. This utility model patent can solve the problems of high cost and excessive performance of laser radar.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A laser radar structure, characterized in that: The invention comprises a spatial light modulator (1), a beam splitter (2), a liquid crystal modulator (4) and an optical lens (5), wherein the liquid crystal modulator (4) comprises a liquid crystal layer (6) having transparent electrodes (7) and a glass substrate (8) on both the upper and lower sides thereof; and the liquid crystal modulator (4), the spatial light modulator (1), the beam splitter (2) and the optical lens (5) are arranged in sequence according to the order in which the light beams pass through.

2. A laser radar structure according to claim 1, characterized in that: It also comprises a signal receiver (3), wherein the signal receiver (3) is used to receive a scanning light beam of a scanned object and confirm the size and position of the scanned object.

3. A laser radar structure according to claim 1, characterized in that: When the transparent electrode (7) has no voltage, the liquid crystals in the liquid crystal layer (6) are arranged in parallel.

4. A laser radar structure according to claim 2, characterized in that: When a voltage is applied to the transparent electrode (7), the liquid crystal crystals in the liquid crystal layer (6) rotate at a certain angle.

5. A laser radar structure according to claim 1, characterized in that: The model of the spatial light modulator (1) is LCOS-SLM X10468-02.

6. A laser radar structure according to claim 1, characterized in that: The optical lens (5) is a convex lens.

7. A laser radar structure according to claim 2, characterized in that: The model of the signal receiver (3) is WK399-IP-210.

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