Area array scanning type laser remote three-dimensional measuring system

Abstract

The invention discloses an area array scanning type laser remote three-dimensional measuring system, which comprises a transmitting end and a receiving end connected with a computer terminal, whereinthe transmitting end comprises a single-mode laser device, a liquid crystal light diffusing plate, a first half-wave plate, a first beam expanding unit, an orthogonal polarization structured light generating module, a third reflector, a second beam expanding unit, a first optical wedge, a second optical wedge and a scanning controller which are sequentially connected; the scanning controller is connected with the computer terminal; the receiving end comprises a telescopic unit, a second half-wave plate and a BS beam splitting prism which are sequentially connected; and the receiving end further comprises a second PBS polarizing and beam splitting prism connected with a second connecting end of the BS beam splitting prism, and a third quarter-wave plate, a third PBS polarizing and beam splitting prism and a fifth reflector which are sequentially connected with a third connecting end of the BS beam splitting prism. The area array scanning type laser remote three-dimensional measuring system has the advantages of high imaging precision, dynamic detection range and high real-time performance, and can achieve high-precision, long-distance and high-resolution three-dimensional imaging.

Description

technical field [0001] The invention relates to unmanned aerial vehicle technology, specifically three-dimensional imaging technology for unmanned aerial vehicle's three-dimensional perception, surveying and mapping to restore real-time scenes, especially an area scanning laser long-distance three-dimensional measurement system. Background technique [0002] Lidar has the characteristics of extremely high detection accuracy, fast and real-time detection speed, and strong anti-interference ability, and has attracted the attention of researchers in the fields of automatic driving and surveying and mapping. Area array 3D imaging lidar is more diverse in practical applications. In terms of space exploration, Sandia National Laboratory has applied non-scanning imaging area array lidar to the rapid detection of damage to the thermal insulation layer of spacecraft; in terms of military applications, the main Applications such as near-ground navigation of aircraft, target camouflage...

AI Technical Summary

Problems solved by technology

[0005] The third existing technology: see "http: / / www.hesaitech.com / " Shanghai Hesai Technology, officially released a 40-line mechanical laser radar for automatic driving in April 2017, with a detection range (0.3m-200m), Measurement accuracy ±5cm (0.3m-0.5m), ±2cm (0.5m-200m), horizontal field of view 360°, vertical field of view -16.7°-7°, measurement frequency 720kHz, scanning frequency 10Hz, 20Hz, based on Time-of-flight measurement method (TOF), the measurement accuracy is not enough for the measurement requirements of fine surface shape

[0006] The fourth existing technology: see "http: / / www.robosense.cn / " Shenzhen Sagitar Juchuang, Sagitar Juchuang's 32-line HAD laser radar, measuring distance (0.2m-200m), measuring accuracy ± 2cm, horizontal The field of view is 360°, the vertical angle is 30°, and the number of points per second is 640,000. Based on the time-of-flight (TOF) measurement method, the measurement accuracy is not enough for the measurement requirements of fine surface shape.

[0007] The production cost of the above-mentioned laser radar is high, and the versatility is not strong. The laser radar in the field of automatic driving requires 360-degree full-field measurement, requires an extremely complicated scanning mechanism, and the cost is also high. The above-mentioned laser radars all use the TOF time-of-flight method. The three-dimensional information formed by the point cloud data obtained by this imaging method can only obtain the rough outline of the object, and the accuracy still cannot meet the needs of the current society. Therefore, the development of an area-array scanning laser long-distance three-dimensional measurement system has become a people's urgent needs

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