Collimation lens and laser radar transmitting device

Abstract

The invention relates to a collimation lens and a laser radar transmitting device which applies the collimation lens. The collimation lens comprises a first optical lens and a second optical lens, wherein the first optical lens is a self-focusing optical lens, and the second collimation lens is a positive optical lens. The laser radar transmitting device which applies the collimation lens is characterized in that a laser light beam transmitted by a laser passes through the first optical lens and the second optical lens in sequence to be injected to a galvanometer, the galvanometer vibrates according to a Lissajous curve, and an object to be tested can be quickly scanned. The self-focusing optical lens in the collimation lens can shape an input light beam, the divergence angle of an outputlight beam is small, and light field evenness is high. The focal length of the self-focusing optical lens is short, the axial packaging length of the collimation lens can be reduced, and a miniaturization purpose is realized. Then, a long focal length optical lens with optical convergence capacity is adopted to carry out collimation on a laser light beam emitted from the self-focusing optical lens, and a good collimation effect can be achieved. Therefore, the laser radar which adopts the collimation lens can exhibit long detection distance and high spatial resolution.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a collimating lens and a laser radar emitting device. Background technique [0002] The field of unmanned driving has recently attracted people's attention. The reliability and safety of unmanned vehicles are related to the safety of people's lives. Install lidar on driverless cars. Using TOF principle, lidar can detect nearby objects and measure the distance of objects during the driving process of the car, so as to control the driving route of the vehicle and the stop and start of the vehicle through the control module of the vehicle. [0003] The principle of TOF is to emit a beam of high-power pulsed laser, hit it on the object to be measured, and calculate the distance by measuring the time difference between the emission time and the reception time. Lidar is usually composed of a laser transmitter and a laser receiver. By installing the laser radar on the driverless car,...

AI Technical Summary

Problems solved by technology

For laser radar transmitters using semiconductor lasers as light sources, the collimation effect of laser beams is relatively poor due to the difference in fast-axis divergence angle and slow-axis divergence angle of laser beams emitted by semiconductor lasers.

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