A laser scan-based system to measure three dimensional conformation and volume of tissue-engineered constructs

Choi, Kyoung-Hwan; Song, Bo; Yoo, Byung-Su; Choi, Byung Hyune; Park, Sora; Min, Byoung‐Hyun

doi:10.1007/s13770-013-1099-4

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Optical measuring devices involve binocular vision, holographic interferometry, and laser triangulation. The laser triangulation method is widely applied for accurate measurement because of its high measurement accuracy, small size device, and fast measurement speed [6][7][8]. So, the laser scanning detection was applied to our system to obtain the outer contour data of the expansion joints of bellows.…”

Section: Detection Principlementioning

confidence: 99%

“…So, the maximum deformation unevenness coefficient τ of a bellows can be obtained by Equation (7). The bellows expansion joints, which fail when τ exceeds 15%, are regarded as substandard products.…”

Section: Convolution Pitch Searchingmentioning

confidence: 99%

“…According to Equation (1) and the data in Table 3, using the LSMS and calipers to measure the convolution pitch, the calculated q s values were 55.83 and 55.73 mm, respectively. According to Equations (4), (6), and (7) and the data in Table 5, we calculated τ Ci and τ Ai , shown in Tables 6 and 7. It can be seen from Tables 6 and 7 that the maximum deformation unevenness coefficients τ were 8.82% and 10.1%, respectively.…”

Section: Applicationmentioning

confidence: 99%

See 2 more Smart Citations

Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner

Yang

Chen

Liu

et al. 2020

Sensors

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An expansion joint is mainly composed of bellows and other components; it is attached on a container shell or pipe to compensate for the additional stress caused by temperature differences and mechanical vibrations. In China, the expansion joint fatigue tests are often used to assess the quality of products. After fatigue tests, convolution pitch will be changed. The amount of change is an important index that can be used to evaluate bellows expansion joints. However, the convolution pitch detection is mainly done manually and randomly by inspection agencies before shipping to the end users. This common practice is not efficient and is often subjective. This paper introduced a novel method for automatically detecting the change of the convolution pitch based on a laser line scanner and data processing technology. The laser line scanner is combined with a precision motorized stage to obtain the point cloud data of the bellows. After denoising and fitting, a peak-finding algorithm is applied to search for the crest of a convolution. The method to find the convolution pitch and the decision that needs to be made to ensure product eligibility are described in detail. A DN500 expansion joint is used as a sample to illustrate the efficiency of the system. The application of the technique intuitively allows a higher precision and relative efficiency in quality inspection of bellows expansion joints. It has also been implemented in the Special Equipment Safety Supervision and Inspection Institute of Jiangsu province with great success.

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Section: Detection Principlementioning

confidence: 99%

Section: Convolution Pitch Searchingmentioning

confidence: 99%

Section: Applicationmentioning

confidence: 99%

See 1 more Smart Citation

Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner

Yang

Chen

Liu

et al. 2020

Sensors

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Cross line structured light scanning system based on measuring arm

Tai

Yang

et al. 2022

2022 International Conference on Electrical, Computer, Communications and Mechatronics Engineering (ICECCME)

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A Cross-Line Structured Light Scanning System Based on a Measuring Arm

Tai

2023

Instruments

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The measurement system proposed in this paper, using a measuring arm and line structured light, has a wide range of applications. To improve the scanning efficiency, the system outlined in this paper uses two single-line structured lights to form crosshair structured light, which we combine with a measuring arm to form a comprehensive scanning measurement system. The calibration method of Zhengyou Zhang and a calibration board are used to complete parameter calibration of the sensors and cameras, as well as hand–eye calibration of the measuring arm. For complex curved-surface objects, this system extracts the cross-line structured light optical center location, which suffers from ambiguity. Therefore, we introduce the use of periodic control of the two line structured light sources in order to resolve the light extraction polysemy. Our experimental results indicate that the proposed system can effectively satisfy the function of crosshair structured light scanning of large, complex surfaces.

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A laser scan-based system to measure three dimensional conformation and volume of tissue-engineered constructs

Cited by 3 publications

References 22 publications

Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner

Detection System for U-Shaped Bellows Convolution Pitches Based on a Laser Line Scanner

Cross line structured light scanning system based on measuring arm

A Cross-Line Structured Light Scanning System Based on a Measuring Arm

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