Laser radar launcher based on laser scanning fiber coupling system

Abstract

The invention relates to a laser radar launcher based on a laser scanning fiber coupling system. A photoelectric encoder and a reflector are respectively connected to the rotating shaft of a brushless DC motor; a collimator in the same axis with the rotating shaft is connected to the tail fiber of a pulse fiber laser device; the end surfaces of one ends of energy transmission fibers are arranged into a circle around the axis and are fixed, and the end surfaces of the other ends of the energy transmission fibers are arranged side by side and fixed to form a fiber panel; a control subsystem is respectively connected with the pulse fiber laser device, the brushless DC motor and the photoelectric encoder; and the control subsystem comprises a motor diver with a Hall sensor, and a FRGA (Field Programmable Gate Array). The invention has the benefits of simple principle, large scanning scope which is not less than + / -16 degrees, compact spatial distribution, easy assembly, high earthquake resistance and high comprehensive efficiency, wherein the overall efficiency of the laser device from transmission to an optical system is 0.81.

Description

technical field [0001] The invention relates to a laser radar transmitting device, in particular to a laser radar transmitting device based on a laser scanning fiber coupling system. Background technique [0002] Lidar is an active modern optical remote sensing device that uses lasers as the radiation source. It is the product of the combination of traditional radar technology and modern laser technology. Since the working wavelength of laser radar is very short, which is three orders of magnitude different from that of microwave radar, and laser is monochromatic coherent light, laser radar has extremely high resolution and anti-interference ability, and is widely used in environmental monitoring and military engineering. , scientific research and national economy and other fields. With the development of laser imaging technology, lidar has also become a new research hotspot in aircraft guidance, helicopter collision avoidance, three-dimensional reconstruction of targets, a...

AI Technical Summary

Problems solved by technology

In the acousto-optic deflection, the frequency of the carrier frequency changes. After passing through the acousto-optic deflector, the diffraction angle of the outgoing beam changes with the change of the loaded carrier frequency. The efficiency of the acousto-optic scanner is high, but the scanning speed is relatively slow. slow

Holographic grating scanning is laser scanning based on holography. Its appearance is a great development of laser scanning technology. It is similar to the usual polygon mirror scanning. It requires a mechanical movement to change the deflection of the laser beam, and applies the principle of optical diffraction. Although the holographic grating scan has a large field of view, high efficiency, and small inertia, it is affected by its own low diffraction efficiency, resulting in low transmittance of the entire scanning system

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