Adjustable distance measuring system and method

Abstract

The invention discloses an adjustable distance measuring system. The adjustable distance measuring system comprises an emitter, a collector and a processing circuit, wherein the emitter comprises a light source array composed of a plurality of sub light sources; the emitter is configured to emit a plurality of linear light beams; the plurality of sub light sources can be at least partially and independently addressed to be dynamically controlled to change at least one of the line direction, the line width, the distance or the scanning direction of the plurality of linear light beams; the collector is configured to collect at least part of optical signals in the linear light beams reflected back by an object; and the processing circuit is connected with the emitter and the collector and isused for calculating the flight time of the linear light beams from being emitted to being collected according to the optical signals. According to the adjustable distance measuring system, scanning distance imaging is realized through the dot matrix light source, and due to the fact that only part of pixel units need to read data at a time, the scale and the storage of the reading circuit can bereduced, and the signal-to-noise ratio can be improved.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to an adjustable distance measuring system and method. Background technique [0002] The Time of Flight (TOF) method calculates the distance of an object by measuring the flight time of the light beam in space. It is widely used in consumer electronics, unmanned driving, AR / VR and other fields. [0003] Distance measurement systems based on the time-of-flight principle, such as time-of-flight depth cameras and lidar systems, often include a light source transmitter and a receiver. Calculate the distance of the object by calculating the time required for the light beam to be reflected and received. [0004] At present, LiDAR based on the time-of-flight method mainly has two types: mechanical and non-mechanical. The mechanical type realizes the distance measurement of a 360-degree large field of view by rotating the base. The transmitter generally uses a single-point light source...

AI Technical Summary

Problems solved by technology

[0004] At present, LiDAR based on the time-of-flight method mainly has two types: mechanical and non-mechanical. The mechanical type realizes the distance measurement of a 360-degree large field of view by rotating the base. The transmitter generally uses a single-point light source and a line light source. The advantages are The beam intensity is concentrated, the measurement range is large, and the accuracy is high. The disadvantage is that the frame rate is low due to the long scanning time; the non-mechanical mid-array laser radar generally emits a surface beam of a certain field of view to space through a surface light source at one time, and passes through the area array. The receiver receives it, so its resolution and frame rate have been improved, but the disadvantages are weak light intensity, poor signal-to-noise ratio, and small measurement range. In addition, it is necessary to demodulate each pixel on the area array receiver at the same time , the scale, storage and power consumption requirements of the readout circuit (such as TDC circuit) are relatively high

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