Three-dimensional imaging method based on single detector correlated imaging theory

Abstract

The invention discloses a three-dimensional imaging method based on a single detector correlated imaging theory. In the method, a digital processor controls a pulse laser to emit intense pulsed light, which is optically processed into the intense pulsed light with a known spatial pattern for irradiating to a spatial optical modulator, and the spatial optical modulator generates a pseudorandom additive phase position for the incident intense pulsed light, wherein the distribution of the pseudorandom additive phase position is known and has been stored already for the subsequent processing of the digital processor; the intense pulsed light passes through an illumination beam expansion system after passing through the spatial optical modulator, irradiates to a target and is reflected, and then is condensed to a high-speed single-point light intensity detector by a condenser lens; detector signals are transmitted to the digital processor after A / D (Analog to Digital) conversion; and after a plurality of times of detection, the digital processor processes the collected information and the stored pseudorandom distribution phase positions to finally produce a three-dimensional image. The method disclosed by the invention can be used for acquiring the three-dimensional information of the target at high speed, and has the advantages of capability of acquiring multiple echo target signals, long detection distance and the like.

Description

technical field [0001] The invention relates to a method for calculating correlation imaging, in particular to a three-dimensional imaging method based on the principle of single-detector correlation imaging. Background technique [0002] As an important three-dimensional ranging technology, lidar technology has the characteristics of narrow beam and high ranging accuracy, and has been widely used in the field of three-dimensional remote sensing and three-dimensional virtual reality. For example: Kaiguang et al. [1] Biomass in forests studied using airborne lidar, Fricker et al. [2] Glaciers in Antarctica were measured using a spaceborne laser altimetry instrument. The traditional lidar adopts single-point ranging and scanning to realize three-dimensional measurement, and the speed of the measuring point is limited by the flight time of photons. For example: for a target with a distance of 1.5Km, the round-trip time of the light pulse is 10μs, and the maximum speed of the...

AI Technical Summary

Problems solved by technology

However, when this method is applied to three-dimensional ranging, the detection distance is limited because the distance of the reference end cannot be too long; one detection requires one imaging, so thousands of detections are performed for each time (distance) slice, and Three-dimensional ranging needs to detect hundreds of time (distance) slices, and the total number of detections exceeds 100,000 times, which will lead to too long detection time and cannot meet the requirements of real-time detection

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