WO2019237599A1

WO2019237599A1 - Solid-state light source of laser radar and laser radar

Info

Publication number: WO2019237599A1
Application number: PCT/CN2018/110044
Authority: WO
Inventors: 鲁开源; 华一敏
Original assignee: 昂纳信息技术（深圳）有限公司
Priority date: 2018-06-14
Filing date: 2018-10-12
Publication date: 2019-12-19
Also published as: CN108562888A

Abstract

A solid-state light source (10) of a laser radar and a laser radar, relating to the field of radar apparatuses. The solid-state light source (10) comprises three light emitters (1) and optical fibers, and further comprises at least one light amplifier (2). The light emitters (1) are fused on the light amplifier (2) through the optical fibers. Light signals emitted by the three light emitters form angles of 120 degrees. The 360-degree scanning range is covered by light emitters with different wavelengths, and a synchronous working mode can be used, and the solid-state light source is suitable for the fields of automatic driving and 3D scanning, etc.

Description

Lidar solid-state light source and laser radar

Technical field

The invention relates to the field of radar devices, in particular to a solid-state light source of a laser radar and a laser radar.

Background technique

The radar uses the emitted laser beam to detect the target's position, velocity, and other characteristic quantities. Its working principle is to first emit a detection laser beam to the target, and then compare the received signal reflected from the target with the transmitted signal for proper processing. , You can get information about the target, such as parameters such as target distance, orientation, altitude, speed, attitude, and even shape.

At present, most laser radars use a mechanical scanning method, and the light source rotates 360 degrees with the mechanical device while emitting a laser. Long-term work will cause the wear of the mechanical structure, which will reduce the life of the lidar.

technical problem

The technical problem to be solved by the present invention is to provide a solid-state light source of a lidar and a lidar to solve the above-mentioned defects of the prior art, and solve the problem that the existing lidar needs to be mechanically rotated.

Technical solutions

In order to solve the technical problem, the present invention provides a solid-state light source of a lidar. The solid-state light source includes three light emitters and optical fibers, and further includes at least one optical amplifier. The optical transmitter is fused to the optical amplifier through an optical fiber. The optical signals emitted by the optical transmitters are 120 ° from each other.

Among them, a preferred solution is that the wavelength of the light emitter is 1550 ± 15 nm.

Among them, a preferred solution is that the optical fiber is doped with a hafnium element and a hafnium element.

Among them, a preferred solution is that the optical transmitter is fused to the front end of the optical amplifier through an optical fiber.

Among them, a preferred solution is that one optical amplifier is provided, and the optical transmitters are all disposed on the optical amplifier.

Among them, a preferred solution is that three optical amplifiers are provided, and the optical transmitters are respectively disposed on corresponding optical amplifiers.

Among them, a preferred solution is that the light emitter is a seed source.

The present invention also provides a lidar, which includes the solid-state light source as described above, the lidar further includes a light receiver and a processor, and the solid-state light source emits a light signal, which is transmitted to an external object after reflection. An optical receiver that sends an optical signal to a processor, and the processor forms parameter information based on the optical signal.

Beneficial effect

The beneficial effect of the present invention is that, compared with the prior art, the present invention designs a solid-state light source of a lidar and a lidar, covers a scanning range of 360 ° with light transmitters of different wavelengths, and can adopt synchronous work This method is suitable for the fields of automatic driving and 3D scanning. In addition, the wavelength of the light emitter is in the range of 1550 ± 15nm, the frequency is high, and it has human eye safety characteristics, and the damage threshold to the human eye is high.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

FIG. 1 is a schematic diagram of a solid-state light source according to the present invention;

2 is a schematic diagram of a 360 ° scanning range formed by the solid-state light source according to the present invention;

FIG. 3 is a structural block diagram of a laser radar of the present invention.

Best Mode of the Invention

A preferred embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1 and FIG. 2, the present invention provides a preferred embodiment of a solid-state light source of a lidar.

Specifically, a solid-state light source 10 for a lidar, the solid-state light source 10 includes three light emitters 1 and an optical fiber, and further includes at least one optical amplifier 2, and the optical transmitter 1 is fused to the optical amplifier 2 through an optical fiber. It is preferably arranged at the front end of the optical amplifier 2, for example, the left side of the optical amplifier 2 in FIG. 1 is the front end, and the right side is the rear end. The optical transmitter 1 is a seed source with a wavelength within the c-band range and can generate continuous pulsed light Signal, the optical amplifier 2 is used to amplify an optical signal. Referring to FIG. 2, the emission angle of the optical transmitter 1 is fixed, the formed optical signals are 120 ° with each other, and cover a 360 ° scanning range through different working wavelengths. The optical transmitter 1 works synchronously and emits an optical signal. After the optical signal passes through the optical amplifier 2, gain gain is obtained, and at this time, the optical power increases.

Wherein, the wavelength of the optical transmitter 1 is 1550 ± 15nm, the repetition frequency of the optical signal in this band can reach megahertz, and has a high water absorption coefficient. When the optical signal is radiated to the human eye, The damage threshold is high, which can protect the human eye and prevent people from being harmed.

In addition, the optical fiber is doped with a europium element and a europium element to transmit an optical signal to achieve gain amplification of the optical signal in a range of 1550 ± 15 nm.

Preferably, one of the optical amplifiers 2 is provided, and the optical transmitters 1 are all disposed on the same optical amplifier 2, that is, the optical transmitters 1 are respectively fused to the optical path input ends of the optical amplifier 2, and The output end of the optical path of 2 is emitted, which can save material and also realize gain amplification of the optical signal. Alternatively, three optical amplifiers 2 are provided, and the optical transmitters 1 are respectively disposed on corresponding optical amplifiers 2, and the optical amplifiers 2 respectively implement gain amplification for the optical transmitters 1.

As shown in FIG. 3, the present invention provides a preferred embodiment of a laser radar.

Specifically, referring to FIG. 3, a laser radar includes the solid-state light source 10 as described above, the laser radar further includes a light receiver 30 and a processor 40, and the solid-state light source 10 emits a light signal. The reflection of the external object 20 is transmitted to the optical receiver 30, which sends the optical signal to the processor 40, and the processor 40 forms parameter information according to the optical signal, for example, the size parameter of the external object 20, Distance parameters, etc., help users to judge, and have broad application prospects in areas such as autonomous driving and 3D scanning. The number of the light receivers 30 may be one, and the reflected signals may be received. The number of the light receivers 30 may be multiple, and the number of the light receivers 30 is the same as the number of the light transmitters 1 to receive the reflected signals.

In summary, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

A solid-state light source for a lidar, characterized in that the solid-state light source includes three light emitters and optical fibers, and further includes at least one optical amplifier, the optical emitter is fused to the optical amplifier through an optical fiber, and the optical emitter The emitted light signals are 120 ° to each other.
The solid-state light source according to claim 1, wherein the wavelength of the light emitter is 1550 ± 15 nm.
The solid-state light source according to claim 2, wherein the optical fiber is doped with a europium element and a europium element.
The solid-state light source according to claim 3, wherein the light emitter is fused to the front end of the optical amplifier through an optical fiber.
The solid-state light source according to claim 1, wherein one of the optical amplifiers is provided, and each of the light emitters is disposed on the optical amplifier.
The solid-state light source according to claim 1, wherein three optical amplifiers are provided, and the light emitters are respectively disposed on corresponding optical amplifiers.
The solid-state light source according to claim 1, wherein the light emitter is a seed source.
A lidar, the lidar comprising the solid state light source according to any one of claims 1 to 7, wherein the lidar further comprises a light receiver and a processor, and the solid state light source emits a light signal, After reflection from an external object, it is transmitted to a light receiver, which sends the light signal to a processor, and the processor forms parameter information according to the light signal.