DMD (digital micromirror device)-based four-dimensional laser radar imaging device and method

Abstract

The invention relates to a DMD (digital micromirror device)-based four-dimensional laser radar imaging device and a DMD (digital micromirror device)-based four-dimensional laser radar imaging method. The device comprises a transmitting device, a target fixed at the light outgoing end of the transmitting device, a first converging lens fixed on the reflected light path of the target, a digital micromirror device (DMD) fixed on the convergent light path of the first converging lens, a second converging lens fixed on the reflected light path of the digital micromirror device (DMD), a receiving device fixed on the convergent light path of the second converging lens, a frequency mixer connected with the receiving device, an intermediate-frequency amplifier connected with the frequency mixer, a quadrature phase detector connected with the intermediate-frequency amplifier, and a signal processing device connected with the quadrature phase detector; and the device also comprises a high-stabilization signal source which is connected with the transmitting device, the frequency mixer and the quadrature phase detector, and a synchronization device which is connected with the transmitting device, the digital micromirror device (DMD) and the signal processing device. The invention also discloses a DMD (digital micromirror device)-based four-dimensional laser radar imaging method. The imaging device and imaging method of the invention have the advantages of excellent effects of detection of targets which are distributed discretely and continuously distributed, high imaging speed and high image resolution.

Description

technical field [0001] The invention relates to the technical field of laser active imaging, in particular to a DMD-based four-dimensional laser radar imaging device and method. Background technique [0002] As a common light source for long-distance detection, laser has the advantages of high energy, good directionality, long propagation distance, and good monochromaticity. The imaging system using laser as a light source has the advantages of long imaging distance and strong anti-interference ability, and is widely used. It is used in many fields such as battlefield, archaeology, surveying, detection and urban modeling. [0003] At present, laser active imaging technology mainly includes two schemes: scanning laser active imaging and non-scanning laser active imaging, but both of these two schemes have some shortcomings. [0004] The scanning laser active imaging system mainly uses mechanical scanning, acoustic (electro) optical scanning, MEMS scanning and other scanning ...

AI Technical Summary

Problems solved by technology

This solution has the advantages of simple structure and fast imaging speed. However, the core device in the non-scanning laser active imaging system is the APD array detector, which is very expensive. Taking the Si type 32×32APD array as an example, each It costs about 100,000 yuan. If it is replaced with a military-grade InGaAs APD array detector with higher sensitivity, the price of a single one will be close to one million. The high price seriously restricts the research and application of non-scanning laser active imaging technology. ; In addition, due to the constraints of the manufacturing process and cost, the resolution of the APD array is relatively low, generally around 32×32, and it is difficult to obtain a clear target image

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