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Closed-loop modulation method of adaptive linear-structure light

A technology of line structured light and modulation method, which is applied in the field of optical detection, can solve the problems affecting the three-dimensional measurement accuracy, the large volume of the measurement system, and the low brightness of line structured light, so as to improve the measurement accuracy, good line characteristics, reduce complexity and cost effect

Active Publication Date: 2017-09-22
XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

[0004] Among them, the line structured light projection measurement method is the most widely used in the field of industrial inspection. There are two main traditional ways of generating line structured light: the first is to convert point laser light into line structured light through a rotating motor; the second is to use an optical lens Convert point laser light into line-structured light; the first method is to generate line-structured light through a mechanical device, and the precision is low; the second method is to pass the point laser through an optical lens, and the optical power is lost, and the brightness of the line-structured light generated is low, seriously Affects the three-dimensional measurement accuracy; and the above two line structured light projection methods require the cooperation of mechanical motion mechanisms to realize line structured light scanning, resulting in large volume and high cost of the measurement system

Method used

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  • Closed-loop modulation method of adaptive linear-structure light
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Embodiment Construction

[0033] The present invention is described in further detail below in conjunction with accompanying drawing:

[0034] see figure 1 , 2 , 3, 4, 5, 6 and 7, a method for generating a large depth of field, adaptive, hoverable, and fast-moving line structured light, which specifically includes the following steps:

[0035] The first step is to design the system parameters.

[0036] 1) Determine the range of the working distance of the line structured light

[0037] Such as figure 1 , the Gaussian laser beam emitted by the laser 1 passes through the first optical lens (aspherical lens) 2, and is incident on the mirror 3, and then reflected to the surface of the measured object. The focal plane of the Gaussian beam is at L 0 , the design depth of field is ΔL, where ΔL=L 2 -L 1 . According to the calculation of the ABCD matrix, the spot size of the beam after passing through the lens can be obtained, and the maximum working distance L 2 spot size ω 2 , the minimum working di...

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Abstract

The invention discloses a closed-loop modulation method of adaptive linear-structure light. A laser beam serves as a spot light source, and a micro vibrating mirror or an optical lens converts the spot light source into linear-structure light, and light intensity of a laser device is modulated via feedback signals, the output light intensity of the laser device is adjusted, and adaptive linear-structure light capable of suspension and rapid movement is generated. Compared with traditional linear-structure light, the light intensity is higher, and the linear characteristic of the linear-structure light is higher; and the linear-structure light is characterized by being high in precision, adaptive light intensity adjustment, capable of suspension and rapid movement. The complexity and cost of a 3D scanning system are reduced, and the measuring precision can be improved. The light intensity of the laser device is adjusted adaptively, objects of different reflectivity can be measured, and the application range of linear-structure light is broadened.

Description

Technical field: [0001] The invention belongs to the field of optical detection, and relates to a closed-loop modulation method of adaptive line structured light, in particular to a generation method of large depth of field, self-adaptive, hoverable and fast moving line structured light. Background technique: [0002] As a bridge between the real world and the virtual digital world, 3D measurement technology plays an increasingly important role. It is widely used in many industries such as industrial inspection, medical health, digital entertainment, e-commerce, cultural relics protection, etc. Due to the advantages of non-contact, high precision and fast speed, optical three-dimensional measurement has developed into the most important technology in the field of three-dimensional inspection. Optical three-dimensional measurement can be divided into two types: active and passive. Passive measurement methods are represented by stereo vision. Although the stereo vision tech...

Claims

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Application Information

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IPC IPC(8): G02B26/10G01B11/25
CPCG01B11/25G02B26/10
Inventor 周翔金瑞杨涛李东
Owner XIAN CHISHINE OPTOELECTRONICS TECH CO LTD
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