Laser pulse energy adjusting device and method and multi-level pulse laser

Abstract

The present invention belongs to the field of laser ranging, and particularly relates to a laser pulse energy adjusting device and method and a multi-level pulse laser. The adjusting device comprisesa laser pulse transmitting control module, a laser pulse transmitting module, an echo signal receiving module and an echo signal processing module. The laser pulse transmitting control module controlsthe laser pulse transmitting module to transmit laser pulses having multi-level energy. The echo signal processing module is used to perform information processing on a received echo signal of the previous transmitted pulse laser, send the processing information to the laser pulse transmitting control module and perform timing processing on the echo signal of the subsequent transmitted pulse laser. For the same target position, the laser pulse transmitting control module adjusts the laser pulse transmitting module according to the processing information to transmit subsequent pulse laser energy so that the intensity of the latter echo signal is within a measurable range. Measurement of large dynamic range of laser radar is realized; no group delay phenomenon exists; and adjusting speed ishigh.

Description

technical field [0001] The invention belongs to the field of laser ranging, in particular to a laser pulse energy adjustment device and method. Background technique [0002] In recent years, lidar has been widely used in ocean detection, forest resources monitoring, terrain mapping, robots and drones due to its advantages of high precision, small size, long distance measurement and strong anti-interference ability. One of the indispensable sensors in the LiDAR realizes its ranging function by calculating the time difference between the time when the laser is emitted and the time when the echo scattered light is received. In the current laser radar system, the method of laser pulse ranging is mainly used to achieve distance measurement, that is, by emitting laser pulses with narrow pulse width and high peak power, and then passing the received feedback through the avalanche photodiode detector (Avalanche PhotoDiode, APD). The wave light signal is converted into an electrica...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the post-stage circuit of the AGC scheme, there will be different group delays in the case of different gains, which will affect the timing accuracy, and its adjustment speed is difficult to meet the needs.

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