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Archimedes spiral-based adjustable scanning device and method for resolution region

An Archimedes spiral and mechanical scanning technology, which is applied in the direction of measuring devices, analyzing materials, and using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve the problems of high complexity of mechanical devices and control modules, and the deviation between the actual position of the probe and the theory , Scanning image stitching adverse effects and other issues, to achieve the effect of improving efficiency and reducing system complexity

Inactive Publication Date: 2017-09-08
GUANGZHOU FENGPU INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former scanning method requires multiple motors to drive multiple dimensions of scanning motion, the complexity of the mechanical device and control module is high, and the movement of different dimensions requires precise control and matching in order to accurately know the coordinates of the scanning point
However, in the latter patent, if there is an error in the rotation of the mechanical module or the motor (such as step loss or skipping of the stepping motor), timely feedback and correction cannot be obtained, resulting in a deviation between the actual position of the probe and the theory, which will affect the splicing of the scanning image. bring adverse effects

Method used

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  • Archimedes spiral-based adjustable scanning device and method for resolution region
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  • Archimedes spiral-based adjustable scanning device and method for resolution region

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: A mechanical device for realizing Archimedes spiral polar coordinate plane scanning

[0021] Such as figure 1 It is an implementation case of the device of the invention to realize angular rotation and radius axial transmission. In this embodiment, the cooperation between the bevel gear and the screw rod is used to realize the linkage between rotation and axial translation. Wherein 101 is a motor driving end, 102 is a bevel gear, which links the rotation of the motor with the rotation of the screw rod, 103 is a screw rod, and 104 is a slide block for installing a probe. When the motor rotates, it will drive the bevel gear to rotate, and at the same time drive the screw to rotate, so that the slider 104 will move horizontally in the radial direction, superimposed angular rotation, and its moving track will form an Archimedes spiral.

[0022] The device is equipped with an angle sensor and a counter in the moving part of the probe. Let the value of the an...

Embodiment 2

[0023] Embodiment 2: A method for determining the scanning interval of plane polar coordinates based on the Archimedes spiral

[0024] Such as figure 2 , is a helical scanning trajectory of the inventive scanning device and a schematic diagram of the positions of the sampling points.

[0025] Assuming that the rotational angular velocity of the motor is constant, and the equation of the helix is ​​r=aθ, consider any two adjacent sampling points A on the helix ( ), B ( ), and order , then the distance interval between AB is:

[0026]

[0027] (1)

[0028] In order to make the sampling points distributed as evenly as possible in the plane, consider setting the interval L of the sampling points as a constant value. About Equation (1), the angular interval can be obtained , the position of the next sampling point can be determined. It is worth noting that the radii at different positions of the helix are different, so in the scanning process of this implementat...

Embodiment 3

[0029] Embodiment 3: A plane polar coordinate scanning sampling process based on the Archimedes spiral.

[0030] Such as image 3 , before starting the scan, initialize the basic parameters, including the motor speed, the distance interval L of the sampling point, and set the start point and end point of the scan, that is, determine the scan range. Then emit samples at the current position, and calculate the angular interval of the next sampling point according to the current position . This process is looped until the scan is complete.

[0031] According to actual needs, the sampling interval L can be a constant value for scanning the entire area, or different intervals can be set in different local areas to realize scanning and mosaic imaging with adjustable global or local resolution.

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Abstract

The invention provides an archimedes spiral-based adjustable scanning device and method for a resolution region. The device provided by the invention forms linkage through angular rotation and radial translation, and completes scanning of a specified region only through driving a scanning probe by a single motor along a specific archimedes spiral path. The position of the probe corresponds to the angular coordinates of the rotation one by one, so the position coordinates of the probe can be accurately known through arranging an angular transducer and a counter. According to the archimedes spiral-based polar coordinate scanning method provided by the invention, the intervals among the sampling points and the rotational speed of the motor are controlled to control the distribution of the sampling points on a path line, so that the sampling resolution is globally or locally adjustable. The archimedes spiral-based adjustable scanning device and method determine the mapping relation between the one-dimensional angle parameters and two-dimensional plane coordinates through the spiral, so scanning can be controlled to be completed by the single motor, the angular coordinates are recorded to accurately know the position coordinates of the probe, and the scanning device has simplicity of structure and reliable performance.

Description

technical field [0001] The invention relates to the fields of scanning detection, mechanical design and control, etc., and specifically relates to a scanning device and method with an adjustable resolution area based on an Archimedes spiral. Background technique [0002] The mechanical scanning device generally uses mechanical and automatic control technology to drive the scanning probe to traverse in a certain area to achieve scanning. For scanning in a two-dimensional plane, existing methods can generally be divided into two types. One is equipped with an array probe, which can complete the detection of a certain linear area at a time, and then drive the array probe through a mechanical device to achieve one-dimensional movement and synthesize a two-dimensional plane scan. However, the complexity of the array probe system is high, and there are strict requirements for the consistency between the array elements, which brings about an increase in cost. Once the array elemen...

Claims

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Application Information

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IPC IPC(8): G01N29/265
CPCG01N29/265
Inventor 韦岗李杰杨萃
Owner GUANGZHOU FENGPU INFORMATION TECH CO LTD
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