• 제목/요약/키워드: NDT applications

검색결과 27건 처리시간 0.023초

비파괴검사기술의 이해 (Understanding of Nondestructive Testing Technique)

  • 허남
    • 기술사
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    • 제33권6호
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    • pp.23-29
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    • 2000
  • The nondestructive tests(NDT) are widely applied at various industrial job sites to detect defects and flaws early and thus to diagnose the quality and integrity of components, structures and systems. This paper discusses the R&MD history of various nondestructive testing techniques, their applications and many technical as well as safety issues identified, particularly in the performance of radiography. Also discussed are the principles of inspection methods and NDT qualifications that should be applied at the industrial job sites. As a result, this paper provides suggestions for improvement in Government programs to promote th NDT industry, for more systematic operation through a direct with the owner, and also for improvement in working conditions for NDT workers.

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Shearography를 이용한 비파괴 검사 (Nondestructive Testing with Shearography)

  • 장석원
    • 비파괴검사학회지
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    • 제21권2호
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    • pp.177-181
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    • 2001
  • 광학적 비접촉 비파괴검사 방법인 ESPI, Shearography를 이용한 측정은 자동차나 항공기산업 등에서 최근 폭넓게 이용되고 있다. 빠른 측정 속도와 측정 대상의 전 영역을 한번에 측정할 수 있는 장점을 가진 Shearography를 이용한 비파괴검사 방법을 기존의 광계측법인 ESPI와 비교하였다. 또한 이러한 장점을 살려 산업현장에서 수행한 여러 가지 비파괴검사 사례를 제시하였다.

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산업용 테라헤르츠 비파괴 검사 기술 (Terahertz Non-destructive Testing Technology for Industrial Applications)

  • 이의수;문기원;이일민;박동우;최다혜;신준환;김현수;박정우;박경현
    • 전자통신동향분석
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    • 제33권3호
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    • pp.59-69
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    • 2018
  • Terahertz (THz) imaging and spectroscopy have been developed as non-destructive testing methods for various industrial applications. However, they have not been widely adopted in real applications owing to a high system price and the large size of conventional THz time-domain spectroscopy systems, which are based on ultrashort optical pulse lasers. Recently, various types of compact THz emitters and detectors have become available. As a result, THz non-destructive test (NDT) systems have become viable solutions. Herein, we briefly review the recent advances in THz NDT techniques adopting continuous-wave THz systems, including our recent results of a THz-based waterproof test system and an electrical connection inspection system for car manufacturing.

Nondestructive tests for defections detection of nanoparticles in cement-based materials: A review

  • Kaloop, Mosbeh R.;Elrahman, Mohamed Abd;Hu, Jong Wan
    • Advances in nano research
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    • 제12권1호
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    • pp.1-23
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    • 2022
  • To date, nondestructive tests (NDT) applications and advances in detecting the dispersion and defections of the nano concrete (NC) materials fields are very limited. The current paper provides a review of the dispersion efficiency of nanomaterials in cement-based materials and how NDT can be efficiently used in detecting and visualizing the defections and dispersions of NC. The review identifies the characteristics of different types of nanoparticles used in NC. Nanomaterials influences on concrete characteristics and their dispersion degree are presented and discussed. The main aim of this article is to present and compare the common NDT that can be used for detecting and visualizing the defections and dispersions of different kinds of nanomaterials utilized in NC. The different microscopy and X-ray methods are explicitly reviewed and compared. Based on the collected data, it can be concluded that the fully detecting and visualizing of NC defections and dispersions have not been fully discovered and that needs further investigations. So, the distinction of this paper lies in defining NDT that can be employed for detecting and/or visualizing NC defections and dispersions.

Serially multiplexed FBG accelerometer for structural health monitoring of bridges

  • Talebinejad, I.;Fischer, C.;Ansari, F.
    • Smart Structures and Systems
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    • 제5권4호
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    • pp.345-355
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    • 2009
  • This article describes the development of a fiber optic accelerometer based on Fiber Bragg Gratings (FBG). The accelerometer utilizes the stiffness of the optical fiber and a lumped mass in the design. Acceleration is measured by the FBG in response to the vibration of the fiber optic mass system. The wavelength shift of FBG is proportional to the change in acceleration, and the gauge factor pertains to the shift in wavelength as a function of acceleration. Low frequency version of the accelerometer was developed for applications in monitoring bridges. The accelerometer was first evaluated in laboratory settings and then employed in a demonstration project for condition assessment of a bridge. Laboratory experiments involved evaluation of the sensitivity and resolution of measurements under a series of low frequency low amplitude conditions. The main feature of this accelerometer is single channel multiplexing capability rendering the system highly practical for application in condition assessment of bridges. This feature of the accelerometer was evaluated by using the system during ambient vibration tests of a bridge. The Frequency Domain Decomposition method was employed to identify the mode shapes and natural frequencies of the bridge. Results were compared with the data acquired from the conventional accelerometers.

Improved Georeferencing of a Wearable Indoor Mapping System Using NDT and Sensor Integration

  • Do, Linh Giang;Kim, Changjae;Kim, Han Sae
    • 한국측량학회지
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    • 제38권5호
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    • pp.425-433
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    • 2020
  • Three-dimensional data has been used for different applications such as robotics, building reconstruction, and so on. 3D data can be generated from an optical camera or a laser scanner. Especially, a wearable multi-sensor system including the above-mentioned sensors is an optimized structure that can overcome the drawbacks of each sensor. After finding the geometric relationships between sensors, georeferencing of the datasets acquired from the moving system, should be carried out. Especially, in an indoor environment, error propagation always causes problem in the georeferencing process. To improve the accuracy of this process, other sources of data were used to combine with LiDAR (Light Detection and Ranging) data, and various registration methods were also tested to find the most suitable way. More specifically, this paper proposed a new process of NDT (Normal Distribution Transform) to register the LiDAR point cloud, with additional information from other sensors. For real experiment, a wearable mapping system was used to acquire datasets in an indoor environment. The results showed that applying the new process of NDT and combining LiDAR data with IMU (Inertial Measurement Unit) information achieved the best result with the RMSE 0.063 m.

Model for Predicting Ultrasonic NDE Reliability and Statistical Data Analysis of Piping Inspection Round Robin

  • Park, Ik-Keun;Kim, Hyun-Mook
    • International Journal of Reliability and Applications
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    • 제5권1호
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    • pp.25-36
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    • 2004
  • Ultrasonic inspection system consist of the examination procedures, equipment, and operators. The reliability of nondestructive testing is influenced by the inspection environment, materials and types of defect. It is very difficult to estimate the reliability of NDT due to the various factors. Piping inspection round robin was conducted to quantify the capability of ultrasonic inspection during in-service. In this study, the models for predicting the ultrasonic NDE reliability by logistic model and linear regression model are discussed. The utility of the NDT reliability assessment is verified by the analysis of the data from round robin test with these models.

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A review of the application of acoustic emission technique in engineering

  • Gholizadeh, S.;Leman, Z.;Baharudin, B.T.H.T.
    • Structural Engineering and Mechanics
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    • 제54권6호
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    • pp.1075-1095
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    • 2015
  • The use of acoustic emission (AE) technique for detecting and monitoring damages and the progress on damages in different structures is widely used and has earned a reputation as one of the most reliable and well-established technique in non-destructive testing (NDT). Acoustic Emission is a very efficient and effective technology used for fracture behavior and fatigue detection in metals, fiberglass, wood, composites, ceramics, concrete and plastics. It can also be used for detecting faults and pressure leaks in vessels, tanks, pipes, as well as for monitoring the progression of corrosion in welding. This paper reviews major research developments over the past few years in application of acoustic emission in numerous engineering fields, including manufacturing, civil, aerospace and material engineering.

초음파를 이용한 복합재료 하니캄 구조물의 Disbonding 검출에 관한 연구 (A Study on the Disbonding Detection of FRP Honeycomb Sandwich Structure by Ultrasonic Methods)

  • 조경식;이주석;이종오;장홍근;이승희
    • 비파괴검사학회지
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    • 제11권1호
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    • pp.23-30
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    • 1991
  • In this study the bonding quality evaluation of FRP honeycomb structure was performed by the ultrasonic C-Scan method and stress wave factor measurements. These NDT techniques could be well applied to the disbonding detection of FRP honeycomb structures. Especially, stress wave factor (SWF) measurement is expected to be a useful technique in field applications.

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디지탈 초음파 화상처리에 의한 반도체 패키지의 미소결함 검출에 관한 연구 (A Study on the Microdefect Detection of Semiconductor Package by Digital Ultrasonic Image Processing)

  • 김재열;한응교
    • 비파괴검사학회지
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    • 제10권2호
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    • pp.43-49
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    • 1990
  • Ultrasonic testing is one of the most useful NDT method for detection of microdefect in the opaque materials. Recently, many applications of the ultrasonic techniques have been extended widely in the new field like electron is and advanced materials. From the result of the experiment, we have hardly found out a crack in the internal parts of the resin and a delamination between chip and resin because of poor performance of the system.

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