Laser radar

Abstract

The invention provides a laser radar which comprises a laser array arranged in a linear array or an area array, a focal plane arranged on a first optical assembly, and the first optical assembly arranged on a transmitting light path and forming an equivalent focal length larger than the focal length of a main lens group unit of a transmitting end. And/or an optical detector array arranged in a linear array or an area array and arranged on a focal plane of a second optical assembly, and the second optical assembly is arranged on a receiving optical path and forms an equivalent focal length larger than the focal length of the main lens group unit at the receiving end. According to the embodiment of the invention, the power density in the point cloud field angle area is improved through the arrangement of the first optical assembly of the light transmitting end, and/or the background light noise power in the point cloud field angle area is reduced through the arrangement of the second optical assembly of the receiving end, so that the distance measurement capability of the radar can be improved.

Description

technical field [0001] The present application relates to the technical field of optical ranging, in particular to laser radar. Background technique [0002] Lidar is a detection device that calculates the distance of an object by emitting a laser and detecting the echo signal reflected after the laser reaches the surface of the object. Therefore, the lidar needs to include two parts: a light emitting (Transmitter X) element and a light detecting (Receiver X) element, which can be called a light emitting module and a light detecting module. [0003] The laser radar includes an optical system, which is distributed in the light emission module and the light detection module. For example, the light emission module includes a main lens group for collimating the emission signal of the laser, etc., and the light detection module includes a lens for converging the echo signal to the detector receiving lens etc. For the light-emitting module (or light-detecting module), its field ...

AI Technical Summary

Problems solved by technology

In order to keep the lidar machine at a suitable height even when it covers a large field of view (such as 105°), the focal length of the emission module and / or detection module has to be reduced, such as replacing the one with a shorter focal length. Optical devices, etc., which will not only reduce the duty cycle of the light-emitting surface but also limit the vertical vertical resolution

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