New real-time non-contact probe using Gaussian convolution smooth technique for in-process inspection

Vacharanukul, K.; Mekid, Samir

doi:10.1016/j.sna.2007.07.015

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…Convolution is a mathematical operation on two functions (f and g) that produces a third function (f*g). In this research, the first function to process data from the raw image can be called function f. The second function is to process the average image from raw data in one area and be called function g [18,19]. Convolution has two functions f (x) and g (x), which are defined as follows: In this case, the sign (*) states that the convolution operator and variable α are auxiliary variables.…”

Section: Smoothmentioning

confidence: 99%

3D Reconstruction using convolution smooth method

et al. 2021

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3D imagery is an image with depth data. The use of depth information in 3D images still has many drawbacks, especially in the image results. Raw data on the 3D camera even does not look smooth, and there is too much noise. Noise in the 3D image is in the form of imprecise data, which results in a rough image. This research will use the convolution smooth methods to improve the 3D image. Will smooth noise in the 3D image, so the resulting image will be better. This smoothing system is called the blurring effect. This research has been tested on flat objects and objects with a circle contour. The test results on the flat surface obtained a distance of 1.3177, the test in the object with a flat surface obtained a distance of 0.4937, and the test in circle contour obtained a distance of 0.3986. This research found that the 3D image will be better after applying the convolution smooth method.

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Section: Smoothmentioning

confidence: 99%

3D Reconstruction using convolution smooth method

et al. 2021

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“…In-process measurement of a workpiece surface y(x, z) (figure 1) is a difficult real-time measurement [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. It is performed in a harsh and complex measurement environment to acquire workpiece surface y(x, z) when the workpiece is being machined.…”

Section: Introductionmentioning

confidence: 99%

“…For in-process measurement, contact and non-contact measurement have been used. However, the contact measurement method is not suitable due to the scratching problem of the workpiece surface and wearing problem of mechanical contact stylus [3,5,8,15]. Therefore, non-contact measurement, especially optical measurement, is very much needed for high precision without any contact damage.…”

Section: Introductionmentioning

confidence: 99%

Use of dual coolant displacing media for in-process optical measurement of form profiles

Gao

Xie

2018

Meas. Sci. Technol.

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In-process measurement supports feedback control to reduce workpiece surface form error. Without it, the workpiece surface must be measured offline causing significant errors in workpiece positioning and reduced productivity. To offer better performance, a new in-process optical measurement method based on the use of dual coolant displacing media is proposed and studied, which uses an air and liquid phase together to resist coolant and to achieve in-process measurement. In the proposed new design, coolant is used to replace the previously used clean water to avoid coolant dilution. Compared with the previous methods, the distance between the applicator and the workpiece surface can be relaxed to 1 mm. The result is 4 times larger than before, thus permitting measurement of curved surfaces. The use of air is up to 1.5 times less than the best method previously available. For a sample workpiece with curved surfaces, the relative error of profile measurement under coolant conditions can be as small as 0.1% compared with the one under no coolant conditions. Problems in comparing measured 3D surfaces are discussed. A comparative study between a Bruker Npflex optical profiler and the developed new in-process optical profiler was conducted. For a surface area of 5.5 mm × 5.5 mm, the average measurement error under coolant conditions is only 0.693 µm. In addition, the error due to the new method is only 0.10 µm when compared between coolant and no coolant conditions. The effect of a thin liquid film on workpiece surface is discussed. The experimental results show that the new method can successfully solve the coolant dilution problem and is able to accurately measure the workpiece surface whilst fully submerged in the opaque coolant. The proposed new method is advantageous and should be very useful for in-process optical form profile measurement in precision machining.

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In-process out-of-roundness measurement probe for turned workpieces

Mekid

Vacharanukul²

2011

Measurement

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New real-time non-contact probe using Gaussian convolution smooth technique for in-process inspection

Cited by 8 publications

References 7 publications

3D Reconstruction using convolution smooth method

3D Reconstruction using convolution smooth method

Use of dual coolant displacing media for in-process optical measurement of form profiles

In-process out-of-roundness measurement probe for turned workpieces

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