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Regionalized lighting detection method

A detection method and regionalized technology, applied in the field of regionalized illumination detection, can solve the problems of low reflected light energy, low reflectivity, interference, etc., and achieve the effect of improving the signal-to-noise ratio and increasing the reflected light energy.

Inactive Publication Date: 2006-09-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diameter of wires and telephone wires is less than 1cm, the reflectivity is often low, and the reflected light energy is extremely small; and they are often close to the ground, mountains and other backgrounds with serious interference, and it is extremely difficult to be detected by ordinary uniform lighting methods

Method used

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  • Regionalized lighting detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] If the method of beam splitting is used for regionalized lighting, it is necessary to shape and expand the beam of the light emitted by the light source to adjust the divergence angle to form a strip of incident light 7, then pass through the beam splitting device, and finally combine to obtain the required lighting structure. Such as figure 2 The optical device shown is composed of two optical planes with a certain angle, which is related to the divergence angle of the light and the number of split rays. One of the optical planes is coated with a total reflection film 5, and the other optical plane is coated with energy A partially reflective film 6 that reflects part of the light. In this way, when the linear beam irradiates the partial reflection film 2, part of the light is emitted, part of the light is reflected by the total reflection film 1 and then reaches the partial reflection film 2 again, and part of the light energy is emitted..., so that A beam of light ...

Embodiment 2

[0037] If a micromirror array is used, it is first necessary to shape the light emitted by the light source to obtain plane incident light 10 to form parallel stripes 11 through the micromirrors, and by adjusting the optical structure of the incident surface 12 and the outgoing surface 13, the required illumination microstructure can be obtained. , and then obtain the required regionalized lighting structure by shaping (beam expanding) optical devices. Such as image 3 The optical device shown can divide the light beam into the required array structure, and then diverge the light beam into a certain angle through the optical device (such as convex lens and concave lens), which will form a grid-like light area 14 or will form a multi-ring light area 15, you can get as Figure 4 Grid-like regionalized lighting structures as shown or as Figure 5 The multi-ring regionalized lighting structure.

Embodiment 3

[0039] If the interference diffraction optical device is used, it is generally necessary to shape the light emitted by the light source first, then obtain the required illumination structure through the interference diffraction optical device, and then obtain the required regionalized illumination structure by adjusting the divergence angle of the beam. Adopting Fabry-Perot interferometer just will form multi-ring light region 15, so just can obtain as Figure 5 The multi-ring areaized lighting structure shown.

[0040] Taking the grid-like regional lighting structure as an example, if the size of the scene area corresponding to one pixel of staring lighting is L, and the line width of regionalized lighting is 1, then S D S S = L 2 l , SNR improvement α = γ ...

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Abstract

This invention relates to a regionalized lighting detection method. Wherein, in imaging detection, with local illumination by beam-splitting local illumination, micro-mirror array illumination or interference / diffraction optical device illumination, focusing the active illumination light on some area as grid shape or multi-ring shape while keeping the unilluminated area with maximal line length less than the minimal target length. This invention can improve reflection light power of fine target and target SNR.

Description

technical field [0001] The invention relates to a regionalized illumination detection technology, in particular to a method for imaging a small target. Background technique [0002] Compared with scanning detection devices such as traditional lidar, imaging devices have higher spatial resolution and faster detection speed, and can effectively detect tiny targets. The flight safety of helicopters and other near-Earth high-speed aircraft is threatened by various small targets, such as birds and wires. Among them, flying birds, balloons and other targets are relatively large, with a diameter greater than 10cm, which can be detected by staring imaging equipment. The diameter of electric wires and telephone wires is less than 1cm, the reflectivity is often low, and the reflected light energy is extremely small; and they are often close to the ground, mountains and other backgrounds with serious interference, and it is extremely difficult to be detected by ordinary uniform lighti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/06
Inventor 严惠民张秀达
Owner ZHEJIANG UNIV