阅读说明：本技术 一种双光路激光扫描组件 (Double-light-path laser scanning assembly ) 是由 张运方 朱飞虎 张东来 郭绍刚 郑岩 王立 王晓磊 于凡 安娜 李硕 于 2021-05-21 设计创作，主要内容包括：本发明涉及一种双光路激光扫描组件,包括：第一激光器组件、主体法兰、反射镜组件、第二激光器组件、分光镜组件、MEMS扫描组件、扩束镜组件；第一激光器组件和主体法兰连接固定；反射镜组件和主体法兰轴孔配合安装；第二激光器组件和主体法兰连接固定；分光镜组件和主体法兰轴孔配合安装。本发明在扫描组件中加入另一种波长的激光,实现双波长激光输出,其中低功率的激光器用于为近距离探测使用,高功率的激光器为远距离探测使用,从而实现宽范围的工作距离,由于不存在活动部件,系统具有更高的可靠性。(The invention relates to a double light path laser scanning assembly, comprising: the MEMS scanning device comprises a first laser component, a main flange, a reflector component, a second laser component, a beam splitter component, an MEMS scanning component and a beam expander component; the first laser component is fixedly connected with the main body flange; the reflector component is matched with the main body flange shaft hole; the second laser assembly is fixedly connected with the main body flange; the beam splitter component is matched with the shaft hole of the flange of the main body. The laser with another wavelength is added into the scanning assembly to realize dual-wavelength laser output, wherein the low-power laser is used for short-distance detection, and the high-power laser is used for long-distance detection, so that the wide-range working distance is realized, and the system has higher reliability because no movable part exists.)

1. A dual optical path laser scanning assembly comprising: the device comprises a first laser component (1), a main flange (2), a reflector component (3), a second laser component (4), a spectroscope component (5), an MEMS scanning component (6) and a beam expander (7);

the first laser component (1) is fixedly connected with the main body flange (2); the reflector component (3) is matched with the shaft hole of the main flange (2); the second laser component (4) is fixedly connected with the main body flange (2); the beam splitter component (5) is matched with the shaft hole of the main flange (2);

the first laser component (1) emits laser A, and the laser A is reflected after passing through the reflector component (3); the reflector component (3) can rotate in the main flange (2) so as to adjust the emergent direction of the laser A; the second laser assembly (4) emits laser light B; after the laser A and the laser B reach the beam splitter component (5), the beam splitter component (5) reflects the laser A and transmits the laser B; the beam splitter component (5) can rotate in the main body flange (2) so as to adjust the emitting directions of the laser A and the laser B; after passing through the spectroscope component (5), the laser A and the laser B irradiate the same position on the MEMS scanning component (6) at the same angle; the MEMS scanning component (6) scans and reflects the incident laser A and the incident laser B; the laser A and the laser B reach the beam-expanding lens assembly (7) after passing through the MEMS scanning assembly (6), and the beam-expanding lens assembly (7) expands the beam of the laser A and the laser B, so that the laser irradiation range is further expanded.

2. The dual optical path laser scanning assembly of claim 1, wherein: the main body flange (2) is integrally and precisely machined, and the key surface is subjected to sandblasting and blackening or black paint spraying, so that the effect of stray light inhibition is achieved.

3. The dual optical path laser scanning assembly of claim 1, wherein: the main body flange (2) comprises 7 external interfaces; the interface 1 is used for mounting a first laser component (1); the interface 2 is used for mounting a reflector component (3); the interface 3 is used for mounting a second laser component (4); the interface 4 is used for mounting a spectroscope component (5); the interface 5 is used for mounting a MEMS scanning component (6); the interface 6 is used for mounting the beam-expanding lens assembly (7); the interface 7 is an external interface of the main body flange.

4. The dual optical path laser scanning assembly of claim 1, wherein: the laser A emitted by the first laser assembly (1) is a parallel beam; grinding the mounting surface of the first laser assembly (1) to enable the light emitting direction of the first laser assembly (1) to be perpendicular to the mounting surface of the main body flange (2); the size of the opening of the laser A on the main body flange (2) is matched with the size of the laser A beam, and stray light is effectively inhibited.

5. The dual optical path laser scanning assembly of claim 4, wherein: the laser B emitted by the second laser assembly (4) is a parallel beam; grinding the mounting surface of the second laser assembly (4) to enable the light emitting direction of the laser B to be perpendicular to the mounting surface of the main body flange (2); the size of the opening of the laser B on the main body flange (2) is matched with the size of the laser B beam, and stray light is effectively inhibited.

6. The dual optical path laser scanning assembly of claim 1, wherein: the scanning mirror of the MEMS scanning component (6) is an MEMS reflecting mirror with a tiny size, and the component internally comprises a damping component which can bear a large-magnitude mechanical environment.

7. The dual optical path laser scanning assembly of claim 1, wherein: the first laser assembly (1) and the second laser assembly (4) have different output optical powers, different working wavelengths and different optical power adjusting ranges, the low-power laser assembly is started at a short distance, and the high-power laser assembly is started at a long distance.

8. The dual optical path laser scanning assembly of claim 1, wherein: the first laser assembly (1) works at 1-300 m, and the emitted laser beam A has the following characteristics: pulse laser with peak energy wavelength of 10 mW; a wavelength of 915 nm; the diameter of the light spot is 0.5 mm; divergence angle 10 mrad; the second laser assembly (4) works at 300-30 Km, and the emitted laser beam B has the following characteristics: pulsed laser with peak energy wavelength 25 KW; wavelength 1064 nm; the diameter of the light spot is 0.8 mm; divergence angle 2 mrad.

9. The dual optical path laser scanning assembly of claim 1, wherein: grinding the mounting surface of the first laser component (1) to enable the included angle between the light emitting direction of the laser A and the normal line of the mounting surface of the main body flange (2) to be not more than 1'; the size of the opening of the laser A on the main body flange (2) is matched with the size of the laser A beam, and the specific size is 1mm in diameter; by grinding the mounting surface of the second laser component (4), the included angle between the light emitting direction of the laser B and the normal line of the mounting surface of the main body flange (2) is not more than 1'; the size of the laser B opening on the main body flange (2) is matched with the size of the laser B beam, and the specific size is 1mm in diameter.

10. The dual optical path laser scanning assembly of claim 1, wherein: the reflector component (3) and the shaft hole of the main flange (2) are fixed by 3M 2.5 screws after being matched and installed; the reflectivity of the reflection mirror component (3) for reflecting the laser A emitted by the first laser component (1) is 99.5%. The mirror assembly (3) can rotate within a range of +/-2 degrees in the main body flange (2) so as to adjust the emitting direction of the laser A.

Technical Field

The invention belongs to the technical field of laser radar transmitting optical systems, and particularly relates to a double-light-path laser scanning assembly.

Background

In the field of deep space exploration, high-precision three-dimensional terrain rendering, navigation and obstacle avoidance need to be carried out on extraterrestrial stars. In order to provide a large maneuvering range for the detector, the obstacle avoidance sensor needs to have a wide working distance.

Most of the existing laser light sources of the obstacle avoidance sensors have single wavelength, and the power of the laser light sources needs to have a large adjustment range in order to realize a wide range of working distance. The laser power is limited in the adjusting range, a movable attenuation sheet is required to be added in the optical path to adjust the transmitting power of the laser, and the use of the movable part not only increases the complexity of the system, but also causes the reduction of the reliability of the whole system.

In order to solve the problems, laser with another wavelength is added into the obstacle avoidance sensor. The obstacle avoidance sensor can realize dual-wavelength laser output, wherein a laser with one wavelength is used for short-distance detection, and a laser with the other wavelength is used for long-distance detection, so that the wide-range working distance is realized.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects in the prior art are overcome, and the double-light-path laser scanning assembly solves the problem that the laser radar is difficult to realize the working distance in a wide range from dozens of meters to hundreds of kilometers.

The technical scheme of the invention is as follows: a dual optical path laser scanning assembly comprising: the MEMS scanning device comprises a first laser component, a main flange, a reflector component, a second laser component, a beam splitter component, an MEMS scanning component and a beam expander;

the first laser component is fixedly connected with the main body flange; the reflector component is matched with the main body flange shaft hole; the second laser assembly is fixedly connected with the main body flange; the beam splitter component is matched with the main body flange shaft hole;

the first laser component emits laser A, and the laser A is reflected after passing through the reflector component; the reflector assembly can rotate in the main body flange, so that the emergent direction of the laser A is adjusted; the second laser component emits laser B; after the laser A and the laser B reach the spectroscope component, the spectroscope component reflects the laser A and transmits the laser B; the beam splitter component can rotate in the main flange, so that the emitting directions of the laser A and the laser B are adjusted; after passing through the spectroscope component, the laser A and the laser B irradiate the same position on the MEMS scanning component at the same angle; the MEMS scanning component scans and reflects the incident laser A and the incident laser B; the laser A and the laser B reach the beam-expanding lens assembly after passing through the MEMS scanning assembly, and the beam-expanding lens assembly expands the beam of the laser A and the laser B, so that the laser irradiation range is further expanded.

The main body flange is integrally and precisely machined, and the key surface is subjected to sandblasting and blackening or black paint spraying, so that the effect of stray light inhibition is achieved.

The main body flange comprises 7 external interfaces; the interface 1 is used for mounting a first laser component; the interface 2 is used for mounting a reflector component; the interface 3 is used for mounting a second laser component; the interface 4 is used for mounting a beam splitter component; the interface 5 is used for mounting the MEMS scanning component; the interface 6 is used for mounting the beam-expanding lens assembly; the interface 7 is an external interface of the main body flange.

The laser A emitted by the first laser assembly is a parallel beam; grinding the mounting surface of the first laser assembly to enable the light emitting direction of the first laser assembly to be perpendicular to the mounting surface of the main body flange; the size of the opening of the laser A on the main body flange is matched with the size of the laser A beam, and stray light is effectively inhibited.

The laser B emitted by the second laser assembly is a parallel beam; grinding the mounting surface of the second laser assembly to enable the light emitting direction of the laser B to be perpendicular to the mounting surface of the main body flange; the size of the laser B opening on the main body flange is matched with the size of the laser B beam, and stray light is effectively inhibited.

The scanning mirror of the MEMS scanning component is an MEMS reflecting mirror with a tiny size, and the component internally comprises a damping component which can bear a large-magnitude mechanical environment.

The first laser assembly and the second laser assembly have different output light powers, different working wavelengths and different light power adjusting ranges, the low-power laser assembly is started at a short distance, and the high-power laser assembly is started at a long distance.

The first laser assembly works in a range of 1m to 300m, and the emitted laser beam A has the following characteristics: pulse laser with peak energy wavelength of 10 mW; a wavelength of 915 nm; the diameter of the light spot is 0.5 mm; divergence angle 10 mrad; the second laser assembly works at 300-30 Km, and the emitted laser beam B has the following characteristics: pulsed laser with peak energy wavelength 25 KW; wavelength 1064 nm; the diameter of the light spot is 0.8 mm; divergence angle 2 mrad.

Grinding the mounting surface of the first laser component to enable the included angle between the light emitting direction of the laser A and the normal line of the mounting surface of the main body flange to be not more than 1'; the size of the opening of the laser A on the main body flange is matched with the size of the laser A beam, and the specific size is 1mm in diameter; by grinding the mounting surface of the second laser component, the included angle between the light-emitting direction of the laser B and the normal of the mounting surface of the main body flange is not more than 1'; the size of the laser B opening on the main body flange is matched with the size of the laser B beam, and the specific size is 1mm in diameter.

The reflector component and the shaft hole of the main flange are fixed by 3M 2.5 screws after being matched and installed; the mirror assembly reflects the laser light a emitted from the first laser assembly with a reflectivity of 99.5%. The reflector assembly can rotate within +/-2 degrees in the flange of the main body, so that the emitting direction of the laser A is adjusted.

Compared with the prior art, the invention has the advantages that:

(1) traditional lidar scanning subassembly only contains the laser instrument of a wavelength, is subject to laser power's adjustment range, and the working distance of tens meters to hundreds of kilometers span is difficult to realize to traditional lidar laser. The invention adds another laser with different wavelength and power in the scanning component, which can equivalently realize wider laser power adjusting range.

(2) In order to improve the power adjustment range of the laser, the traditional laser radar scanning assembly mostly adopts different types of optical filters to realize laser energy attenuation in different degrees. The switching of different types of filters entails the use of moving parts, which not only increase the complexity of the system, but also cause a decrease in the reliability of the whole system. The laser with another wavelength is added into the scanning assembly to realize dual-wavelength laser output, wherein the low-power laser is used for short-distance detection, and the high-power laser is used for long-distance detection, so that the wide-range working distance is realized, and the system has higher reliability because no movable part exists.

(3) And the traditional laser radar scanning component mostly adopts a mechanical swing mirror to realize the scanning of laser beams. The mechanical swing mirror has many disadvantages such as large size, heavy weight, high power consumption and poor adaptability to mechanical environment. The MEMS micro-reflector is adopted, the diameter of the reflector surface is only a few millimeters, the size is small, the weight is low, the power consumption is low, and the assembly comprises the damping assembly, so that the MEMS micro-reflector can adapt to severe mechanical environment and has wide application scenes.

Drawings

FIG. 1 is a diagram of a dual optical path laser scanning assembly;

FIG. 2 is a schematic view of a main flange structure;

Detailed Description

The invention is described in detail below with reference to the accompanying figures 1-2 and examples.

A dual optical path laser scanning assembly comprising: the device comprises a first laser component 1, a main flange 2, a reflector component 3, a second laser component 4, a spectroscope component 5, an MEMS scanning component 6 and a beam expander 7;

the first laser component 1 and the main body flange 2 are fixedly connected; the reflector component 3 is matched with the shaft hole of the main flange 2; the second laser component 4 is fixedly connected with the main body flange 2; the spectroscope component 5 is matched with the shaft hole of the main flange 2;

the first laser component 1 emits laser A, and the laser A is reflected after passing through the reflector component 3; the reflector component 3 can rotate in the main flange 2, so as to adjust the emergent direction of the laser A; the second laser assembly 4 emits laser light B; after the laser A and the laser B reach the spectroscope component 5, the spectroscope component 5 reflects the laser A and transmits the laser B; the beam splitter component 5 can rotate in the main body flange 2, so that the emitting directions of the laser A and the laser B are adjusted; after passing through the spectroscope component 5, the laser A and the laser B irradiate the same position on the MEMS scanning component 6 at the same angle; the MEMS scanning component 6 scans and reflects the incident laser A and the incident laser B; the laser A and the laser B pass through the MEMS scanning component 6 and then reach the beam expanding component 7, and the beam expanding component 7 expands the beams of the laser A and the laser B, so that the laser irradiation range is further expanded.

The main body flange is integrally and precisely machined, and the key surface is subjected to sandblasting and blackening or black paint spraying, so that the effect of stray light inhibition is achieved. The surface 1 (cylindrical surface), the surface 2 (cylindrical surface) and the surface 3 (cylindrical surface) are all provided with extinction threads; the surfaces 4-9 are protected, and all the other surfaces are subjected to black anodization after sand blasting or black paint spraying.

The first laser assembly and the main body are fixedly connected through flanges. The laser A emitted by the first laser assembly is a parallel beam. By grinding the mounting surface of the first laser assembly, the light emitting direction of the laser A can be perpendicular to the mounting surface of the main body flange. The size of the opening of the laser A on the main body flange is matched with the size of the laser A beam, so that stray light can be effectively inhibited.

The reflector component is matched with the shaft hole of the flange of the main body. The mirror assembly reflects the laser light a emitted by the first laser assembly. The reflector assembly can rotate in the flange of the main body within a small angle range, so that the emitting direction of the laser A is adjusted.

The second laser assembly and the main body are fixedly connected through flanges. The laser B emitted by the second laser assembly is a parallel beam. By grinding the mounting surface of the second laser assembly, the light emitting direction of the laser B can be perpendicular to the mounting surface of the main body flange. The size of the opening of the laser B on the main body flange is matched with the size of the laser B beam, so that stray light can be effectively inhibited.

The beam splitter component is matched with the shaft hole of the flange of the main body. The spectroscope assembly reflects the laser A and transmits the laser B. The beam splitter component can rotate in the main body flange within a small angle range, so that the emitting directions of the laser A and the laser B are adjusted.

After passing through the spectroscope component, the laser A and the laser B irradiate the same position of the MEMS scanning component at the same angle.

The MEMS scanning component scans and reflects the incident laser A and the incident laser B. The MEMS scanning component internally comprises a damping component, and can bear a large-magnitude mechanical environment.

And the laser A and the laser B reach the beam-expanding lens assembly after passing through the MEMS scanning assembly. The beam expander component expands the beams of the laser A and the laser B, and the laser irradiation range is further expanded.

The first laser assembly and the second laser assembly are started at different working distances, and therefore the working distance in a large range is achieved.

Example 1:

as shown in fig. 1, a dual optical path laser scanning assembly includes: the laser comprises a first laser component, a main body flange, a reflector component, a second laser component, a beam splitter component, an MEMS scanning component and a beam expander.

The main body flange is formed by aluminum alloy integrated precision machining. As shown in fig. 2, the critical surfaces were sandblasted black. The main body flange is connected with the first laser component, the reflector component, the second laser component, the beam splitter component, the MEMS scanning component, the beam expander and the like through screws.

The first laser component and the main body flange are fixedly connected through 4M 2.5 screws;

the first laser assembly works in a range of 1m to 300m, and the emitted laser beam A has the following characteristics: pulse laser with peak energy wavelength of 10 mW; a wavelength of 915 nm; the diameter of the light spot is 0.5 mm; divergence angle 10 mrad.

By grinding the mounting surface of the first laser assembly, the included angle between the light emitting direction of the laser A and the normal line of the mounting surface of the main body flange can be enabled to be not more than 1'. After stray light suppression and adjustment machining allowance are considered, the size of the laser A opening on the main body flange is matched with the size of the laser A beam, and the specific size is 1mm in diameter.

The reflector component and the main body flange shaft hole are fixed by 3M 2.5 screws after being matched and installed. The mirror assembly reflects the laser light a emitted from the first laser assembly, and has a reflectivity of 99.5%. The reflector assembly is rotated within a range of +/-2 degrees in the flange of the main body, so that the emitting direction of the laser A is adjusted.

The second laser component and the main body flange are fixedly connected through 4M 2.5 screws;

the second laser assembly works at 300-30 Km, and the emitted laser beam B has the following characteristics: pulsed laser with peak energy wavelength 25 KW; wavelength 1064 nm; the diameter of the light spot is 0.8 mm; divergence angle 2 mrad.

By grinding the mounting surface of the second laser assembly, the included angle between the light emitting direction of the laser B and the normal line of the mounting surface of the main body flange can be enabled to be not more than 1'. After stray light suppression and adjustment machining allowance are considered, the size of the hole of the laser B on the main body flange is matched with the size of the laser B beam, and the specific size is 1mm in diameter.

The beam splitter component is matched with the shaft hole of the flange of the main body. The spectroscope assembly reflects the laser beam a, has a reflectance of 95%, transmits the laser beam B, and has a transmittance of 97%. The beam splitter assembly rotates within a range of +/-2 degrees in the main body flange, so that the emitting directions of the laser A and the laser B are adjusted.

After passing through the spectroscope component, the laser A and the laser B irradiate the same position of the MEMS scanning component at the same angle.

The MEMS scanning component scans and reflects the incident laser A and the incident laser B. The MEMS scanning component internally comprises a rubber damping component which can bear severe mechanical environment.

And the laser A and the laser B reach the beam-expanding lens assembly after passing through the MEMS scanning assembly. The beam expander component expands the laser A and the laser B by 2 times of angle, and further expands the laser irradiation range.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.