Long distance high resolution laser active imaging device and method based on spatial coding

Abstract

The invention provides a long distance high resolution laser active imaging device and method based on spatial coding. The device comprises a laser light source, a two-dimensional laser scanning mirror fixed to the light emitting end of the laser light source, a target fixed to a two-dimensional laser scanning lens area, an imaging lens fixed to a target reflection optical path, a photoelectric array detector fixed to the imaging lens imaging optical path, a scanning lens rotation angle measurement device connected to the laser scanning lens, a space decoding and laser distance measurement module connected to the photoelectric array detector through a conductive wire, a computer connected to the space decoding and laser distance measurement module and the scanning lens rotation angle measurement device through conductive wires, and a laser controller connected to the laser light source through a conductive wire. The invention also discloses an image method of the device. In the condition of ensuring high resolution, the detection distance is expanded.

Description

technical field [0001] The invention belongs to the technical field of laser radar imaging, and in particular relates to a long-distance high-resolution laser active imaging device and method based on spatial coding. Background technique [0002] There is a problem with the current scanning lidar, that is, the contradiction between the repetition frequency of the pulsed laser and the detection distance. We need to present high-resolution images, which requires a high repetition rate of the laser source. However, the higher the repetition rate, the shorter the detection distance of the target object. Taking a laser with a repetition rate of 1MHZ as an example, the emission interval period is 1μs. In order to ensure accurate ranging, it is necessary to ensure that the emission and reception of the laser beam at the previous moment is completed before the laser beam is emitted at the next moment. Therefore, the farthest detection distance is 150m. When over 150m, t 1 Befor...

AI Technical Summary

Problems solved by technology

In this case, it is possible that t 2 The laser beam at time is prior to t 1 The moment the laser beam is picked up by the detector, causing confusion

In this case, the distance to the detection target cannot be calculated

[0003] According to the traditional method and device, if the detection distance is to be increased, the repetition rate of the pulse laser needs to be reduced, and the image resolution is also reduced, which restricts the further improvement of the imaging quality and the detection distance

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