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Article
Publication date: 1 June 2001

A. Formisano, R. Martone and F. Trevisan

The applied research in the thermonuclear fusion area is directed towards the design of a commercial reactor. In such a reactor, the room required for the probes deputised to…

Abstract

The applied research in the thermonuclear fusion area is directed towards the design of a commercial reactor. In such a reactor, the room required for the probes deputised to measure the magnetic field for the identification step of the control system must be kept to a minimum, and the number and position of probes must be optimised. A possible approach to the optimal choice of a set of magnetic probes for the reconstruction of a magnetostatic field, based on a statistical approach, is presented and discussed.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 20 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 1 April 1989

K.‐P. Koch

Industrial metrology is being radically alerted by advanced technology, as an expert reports.

Abstract

Industrial metrology is being radically alerted by advanced technology, as an expert reports.

Details

Sensor Review, vol. 9 no. 4
Type: Research Article
ISSN: 0260-2288

Article
Publication date: 1 March 1994

C Butler

Looks at work carried out by The Centre for Manufacturing Metrology atBrunel University into developing new probes for high precision dimensionalmeasurement. Describes the…

153

Abstract

Looks at work carried out by The Centre for Manufacturing Metrology at Brunel University into developing new probes for high precision dimensional measurement. Describes the conventional “touch‐trigger” probe and the errors in its performance. Also describes three prototype probes all based on fibre optic principles: a two dimensional Triggering Probe; a three dimensional Analogue Probe and a non‐contact probe. Concludes that the 2‐D triggering probe is a simple construction but limited to 2‐D operation; the analogue 3‐D is smaller in comparison with existing types, comparable in accuracy and cheaper to manufacture, and the non‐contact probe has potential for future development with some form of “intelligent” data processing.

Details

Sensor Review, vol. 14 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 13 March 2009

Yung‐Tsan Jou, Hui‐Ming Wee, Hsiao‐Ching Chen, Yao‐Hung Hsieh and Laurence Wang

The purpose of this paper is to create a usable life forecast model for consumable parts using neural network approach. It focuses on a consumable probe card used in the…

Abstract

Purpose

The purpose of this paper is to create a usable life forecast model for consumable parts using neural network approach. It focuses on a consumable probe card used in the semiconductor wafer testing operation. Referring to the relevant resources and the semiconductor testing operation, a fundamental concept is built to develop a probe card management system.

Design/methodology/approach

A neural network analysis software package, Q‐net2000, is applied in this study. In this case, there is one hidden layer and the neural network learning rates and momentum are set to 0.1 and 0.7. Forecast the usable life by inputting the initial values of the neural network variables into a back‐propagation neural network.

Findings

In this system, the first thing is to collect the production, maintenance and repair data, and then analyze those data by using a neural network methodology to effectively forecast a probe card's usable life. Those data are integrated to derive an optimum timing of placing a probe card order using an inventory control technique. Finally, the actual production data of a company are used to verify the feasibility of this research.

Research limitations/implications

The results presented are based on a representative expendable probe card manufacturing process in the Taiwan industry, a range of alternative scenarios and changes to the process design can be investigated using the simulation model.

Practical implications

For the semiconductor industry, the research supports the introduction on lifecycle forecast technology for expendable probe card manufacturing process.

Originality/value

The paper proposes a neural network forecast analysis to solve the case company's current management problem of determining the life cycle of probe cards in an earlier time.

Details

Journal of Manufacturing Technology Management, vol. 20 no. 3
Type: Research Article
ISSN: 1741-038X

Keywords

Book part
Publication date: 10 February 2012

Erin M. Bryant, Richard Harper and Philip Gosset

Purpose — We assert that researchers developing new web interaction tools should consider an array of user motives beyond query-based information retrieval. This chapter reports…

Abstract

Purpose — We assert that researchers developing new web interaction tools should consider an array of user motives beyond query-based information retrieval. This chapter reports on two probes used to investigate user activities that go beyond search as traditionally conceived.

Design/methodology — This chapter reviews research on user experiences with search engines and general web use. It then describes the design and case study of cards and pebbles, two search engine-based probes developed to help elicit new concepts for web-based experiences.

Findings — Participants reflect on their experiences with the probes and offer ideas regarding how to incrementally shift the traditional search paradigm and conceive of the web in new ways.

Implications/value — This investigation serves as a starting point by offering criteria that should be considered when designing new ‘beyond search’ tools.

Details

Web Search Engine Research
Type: Book
ISBN: 978-1-78052-636-2

Keywords

Article
Publication date: 1 August 2023

Fatima Barrarat, Karim Rayane, Bachir Helifa, Samir Bensaid and Iben Khaldoun Lefkaier

Detecting the orientation of cracks is a major challenge in the development of eddy current nondestructive testing probes. Eddy current-based techniques are limited in their…

Abstract

Purpose

Detecting the orientation of cracks is a major challenge in the development of eddy current nondestructive testing probes. Eddy current-based techniques are limited in their ability to detect cracks that are not perpendicular to induced current flows. This study aims to investigate the application of the rotating electromagnetic field method to detect arbitrary orientation defects in conductive nonferrous parts. This method significantly improves the detection of cracks of any orientation.

Design/methodology/approach

A new rotating uniform eddy current (RUEC) probe is presented. Two exciting pairs consisting of similar square-shaped coils are arranged orthogonally at the same lifting point, thus avoiding further adjustment of the excitation system to generate a rotating electromagnetic field, eliminating any need for mechanical rotation and focusing this field with high density. A circular detection coil serving as a receiver is mounted in the middle of the excitation system.

Findings

A simulation model of the rotating electromagnetic field system is performed to determine the rules and characteristics of the electromagnetic signal distribution in the defect area. Referring to the experimental results aimed to detect artificial cracks at arbitrary angles in underwater structures using the rotating alternating current field measurement (RACFM) system in Li et al. (2016), the model proposed in this paper is validated.

Originality/value

CEDRAT FLUX 3D simulation results showed that the proposed probe can detect cracks with any orientation, maintaining the same sensitivity, which demonstrates its effectiveness. Furthermore, the proposed RUEC probe, associated with the exploitation procedure, allows us to provide a full characterization of the crack, namely, its length, depth and orientation in a one-pass scan, by analyzing the magnetic induction signal.

Details

Sensor Review, vol. 43 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 13 February 2023

Meng Li, Li Yuan Liu, Rui Zhou, Jun Yang, Qiong Qu and Haitao Song

Considering the industrial site environment and installation requirements, the straight-beam ultrasound probe with easy installation and good coupling agent adaptability is…

Abstract

Purpose

Considering the industrial site environment and installation requirements, the straight-beam ultrasound probe with easy installation and good coupling agent adaptability is adopted to replace the traditional water immersion focusing probe for film thickness measurement in cylindrical roller bearings. The straight-beam probe has a large echo receiving range, which will result in measurement regions overlapping and bring about large measurement errors. In this paper, an improved measurement method for film thickness of cylindrical roller bearing with the straight-beam probe is developed.

Design/methodology/approach

An improved method is proposed to enhance the spatial resolution of the straight-beam probe. By introducing a correction coefficient based on the percentage of the effective measurement area, the method improves the measuring accuracy successfully.

Findings

The experimental results demonstrate that the lubricant-film thickness can be measured to reasonable accuracy by this method and have a better agreement with the theoretical film thickness solutions.

Originality/value

This paper used analytical method and model that is helpful for the improvement of the spatial resolution, which has great influence on the measuring accuracy, is mainly determined by the echo reflection area size of the ultrasound transducer.

Details

Industrial Lubrication and Tribology, vol. 75 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 29 April 2021

Bekir Yilmaz Pekmezci and Isil Polat Pekmezci

Material properties, such as shear and compressive strength of masonry, have a crucial impact on the seismic analysis results of masonry structures. Considering that most of the…

Abstract

Purpose

Material properties, such as shear and compressive strength of masonry, have a crucial impact on the seismic analysis results of masonry structures. Considering that most of the historical buildings are masonry structures, the damage caused by obtaining shear strengths with known methods exceeds acceptable limits. Instead of traditional shear strength index tests, this paper presents a test technique that has been developed which causes less damage to the structure, to obtain mechanical properties in masonry structures.

Design/methodology/approach

A new approach to shear testing and a test probe has been developed to minimize the destructive effects of mechanical in situ testing on masonry structures. The comparison of the results obtained with reduced destruction level using the novel shear strength index test probe with those obtained from the traditional method is addressed. Masonry specimens were tested in the laboratory and in situ tests were carried out on 12 historical buildings.

Findings

Test results obtained from the proposed probe shear strength index test were consistent with the results obtained from the conventional shear strength test both at the laboratory setting and in situ. Although a large number of data is needed for the validation of a method, satisfactory agreement with the conventional shear strength index test method was obtained.

Originality/value

The authors believe that the proposed method would give the opportunity to collect more mechanical strength data with much less destruction. The experimental work in the laboratory and in situ tests and their comparisons are the supportive and original values of this research.

Details

International Journal of Building Pathology and Adaptation, vol. 40 no. 5
Type: Research Article
ISSN: 2398-4708

Keywords

Article
Publication date: 14 August 2018

Fangfang Liu, Jingfan Wang, Lijuan Chen, Ruijun Li, Haojie Xia and Liandong Yu

There is an increasing demand for higher-accuracy dimensional measurements of nano- and micro-structures. Recently, the authors presented a fiber Bragg grating (FBG) sensor-based…

Abstract

Purpose

There is an increasing demand for higher-accuracy dimensional measurements of nano- and micro-structures. Recently, the authors presented a fiber Bragg grating (FBG) sensor-based dynamic nano-coordinate-measuring machine (CMM) probe for true three-dimensional coordinate measurement, in which a specific mechanical structure with several FBG sensors was developed to provide the probe with sensitivity to loading in all directions.

Design/methodology/approach

The study presents a three-dimensional sensing and demodulation system based on an improved matched filter design and the time division multiplexing technique that helps solve the problem of multiplex FBG-signals conflicts. In addition, the application of the dynamic mode of the probe system effectively solves the problem presented by the surface interaction forces.

Findings

Consequently, this FBG-based vibrating probe system has increased sensitivity to strain, while maintaining smaller contact force. The experiments for testing probe performance show that the prototype yielded a measurement resolution of 13 nm, a repeatability of 50 nm and a vertical measurement force of less than1.5 mN.

Research limitations/implications

The force tests in the horizontal directions are difficult to conduct because both the probe and the dynamometer are only adaptable to vertical use.

Practical implications

Development of the FBG-based dynamic nano-coordinate-measuring machine probe will achieve a new and inexpensive method for higher-accuracy dimensional measurements of nano- and micro-structures, such as micro-electromechanical systems, micro-fluidic chips, inkjet and diesel engine injector nozzles that are in overall dimensions within the micrometer scale.

Originality/value

The study presents a three-dimensional sensing and demodulation system for the vibrating nano-coordinate-measuring machine probe based on FBG sensors. The prototype yielded a measurement resolution of 13 nm, a repeatability of 50 nm and a vertical measurement force of less than1.5 mN.

Details

Sensor Review, vol. 39 no. 2
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 1 February 2000

G.K. Glass, S.N. Field and W.K. Green

Conductive coatings form the basis of a common anode system used in the cathodic protection of steel in concrete. One of the properties required by such a coating is a low sheet…

1373

Abstract

Conductive coatings form the basis of a common anode system used in the cathodic protection of steel in concrete. One of the properties required by such a coating is a low sheet resistance (square resistance). This, together with the protection current density and anode connection geometry, determines the uniformity of the current distribution over the concrete surface. It is shown that the sheet resistance may be determined using a non‐destructive test employing a collinear four‐probe array. When a current (I), passed between the outer probes of an equally spaced four‐probe array, induces a voltage difference (δV) between the inner probes, the sheet resistance is given by (pgr;/ln2)x(dgr;V/I). The validity of the measured values may be assessed by the absence of any sensitivity to probe orientation and spacing. This technique may be used in the assessment of the quality of installed conductive coating anodes. The sheet resistance will depend on factors such as the thickness and age of the installed coating.

Details

Anti-Corrosion Methods and Materials, vol. 47 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

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