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Article
Publication date: 20 June 2019

Shiyu Feng, Chaoyue Li, Xiaotian Peng, Lei Shao and Weihua Liu

The purpose of this study is to measure the mass diffusion coefficient of nitrogen in jet fuel using digital holography interferometry for cost-effective designing and…

Abstract

Purpose

The purpose of this study is to measure the mass diffusion coefficient of nitrogen in jet fuel using digital holography interferometry for cost-effective designing and modeling of the aircraft tank inerting system.

Design/methodology/approach

The mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels were measured by digital holography interferometry at temperatures ranging from 278.15 to 343.15 K. The Arrhenius equation is used to adequately describe the relationship between mass diffusion coefficients and temperature. The viscosities of RP-3 and RP-5 jet fuels were also measured to examine the accuracy of the Stokes–Einstein model in calculating mass diffusion coefficients.

Findings

As temperature increases from 278.15 to 343.15 K, the mass diffusion coefficients increase 4.23-fold for N2 in RP-3 jet fuel and 5.13-fold for N2 in RP-5 jet fuel. The value of Dµ/T is not constant as the Stokes–Einstein equation expressed, but is a weak linear function of temperature.

Practical implications

A more accurate diffusion model is proposed by fitting the measured Dµ/T with the temperature and calculating the mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels within 10 per cent relative deviation.

Originality/value

A measurement system for mass diffusion coefficients of N2 in RP-3 and RP-5 jet fuels was constructed based on the digital holography interferometry. The mass diffusion coefficient can be expressed by a uniform polynomial function of temperature and viscosity.

Details

Aircraft Engineering and Aerospace Technology, vol. 91 no. 8
Type: Research Article
ISSN: 1748-8842

Keywords

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Article
Publication date: 1 February 1992

T.S. Gross, D.W. Watt, R.S. Raber, J.A. Perault and Y. Zhang

The failure of copper‐plated holes in dielectric laminates during thermal cycling is a serious problem for the electronics industry. The large difference in out‐of‐plane…

Abstract

The failure of copper‐plated holes in dielectric laminates during thermal cycling is a serious problem for the electronics industry. The large difference in out‐of‐plane thermal expansion between the dielectric laminate and the copper plating can cause the copper plating to deform and fail as the board is thermally cycled. The purpose of this study was to demonstrate the feasibility of using electro‐optic holographic interferometry (EOHI) to measure deformation around plated holes and to evaluate methods for estimating the stress in the barrel plating. It was demonstrated that EOHI was more than adequate to resolve the out‐of‐plane thermally induced displacement field around an array of plated‐through holes. The displacement sensitivity was better than ±10 nm with high spatial resolution (92 ?m horizontally and 75 ?m vertically).The expansion was reasonably linear from 30°C to 120°C. The deformation around the individual holes was not axisymmetric. It is suggested that the method for estimating barrel stresses may be too sensitive to thickness and architecture variations in the pad for reliable stress estimates. An alternative scheme for estimation of barrel stresses based on thermal strain energy evaluation is described.

Details

Circuit World, vol. 18 no. 3
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 30 March 2010

Robert Bogue

The purpose of this paper is to provide a review of three‐dimensional (3D) measurement technologies and their applications.

Abstract

Purpose

The purpose of this paper is to provide a review of three‐dimensional (3D) measurement technologies and their applications.

Design/methodology/approach

This paper first describes 3D measuring techniques and then considers a selection of key applications, citing a number of specific examples. Reference is also made to certain new developments and research activities.

Findings

It is shown that both active and passive techniques are used to conduct 3D measurements. The former includes various forms of laser scanning such as time of flight, triangulation and phase measurements and photogrammetry is the main passive method. Laser‐based Doppler shift techniques are used to monitor dynamic phenomena, notably vibration, in three dimensions. These methods are used across a diversity of industries and disciplines in a wide and varied range of applications.

Originality/value

The paper provides a technical review of the leading 3D measurement technologies and their uses.

Details

Sensor Review, vol. 30 no. 2
Type: Research Article
ISSN: 0260-2288

Keywords

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Article
Publication date: 1 September 1996

Bridget Marx

Looks at complex applications for lasers, optics and electro‐optics, including use in areas such as inspection and measurement. Features ESPI (electronic speckle pattern…

Abstract

Looks at complex applications for lasers, optics and electro‐optics, including use in areas such as inspection and measurement. Features ESPI (electronic speckle pattern interferometry) systems and their use in the automotive industry and presents a case study involving specialist systems used in areas such as measuring print rollers and inspecting engine cylinder walls. Touches on other new techniques in the field such as chemical imaging and the recent use of Doppler vibrometry to quantify pure bending vibrations in rotating components.

Details

Sensor Review, vol. 16 no. 3
Type: Research Article
ISSN: 0260-2288

Keywords

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Article
Publication date: 1 March 1983

A major demonstration of industrial research and development capability was mounted at the Hanover Fair this year by the Measurement Technology section of Volkswagen…

Abstract

A major demonstration of industrial research and development capability was mounted at the Hanover Fair this year by the Measurement Technology section of Volkswagen Research. It included a variety of laser interferometry applications, acoustic mapping with the help of an industrial robot, and a new high‐speed camera.

Details

Sensor Review, vol. 3 no. 3
Type: Research Article
ISSN: 0260-2288

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Article
Publication date: 20 December 2017

Magdalena Wójcik

The subject of this paper is the application of holograms in cultural institutions. The purpose of this paper is to define the potential areas of hologram use in…

Abstract

Purpose

The subject of this paper is the application of holograms in cultural institutions. The purpose of this paper is to define the potential areas of hologram use in libraries, particularly in education and promotion, and also in services.

Design/methodology/approach

The method of analysis and criticism of literature was used. Based on a search conducted through Google Scholar for the 2006-2016 period, the current state of research on the use of holograms in cultural institutions was established. Subsequently, in order to find examples of hologram use in libraries, museums, galleries, and social organizations, an established set of queries was used to systematically search network resources using global search engines and metasearch engines. The initial list of results was narrowed down to the most relevant. On the basis of the above fact, the main areas of hologram use in cultural institutions were defined and examples of best practices were selected according to chosen criteria. The comparative method then was used to determine potential areas of application of holographic techniques in libraries. Finally, SWOT analysis – the situational analysis method known to management sciences – was used to determine opportunities and threats related to the use of holograms in cultural institutions.

Findings

Holograms have broad potential use in libraries that is even broader than initially assumed because they are not limited to education, promotion and services, and can also be used in documentation, research and exhibitions. The use of holograms can bring many benefits, but it is also associated with certain risks that need to be considered.

Practical implications

The results can be widely used in practice as a framework for the implementation of holographic techniques in libraries.

Social implications

The paper can help initiate debate on the opportunities and risks of using holograms in cultural institutions.

Originality/value

The issue of the use of holograms has not yet been widely discussed in library and information science scientific journals.

Details

Library Hi Tech, vol. 36 no. 1
Type: Research Article
ISSN: 0737-8831

Keywords

Content available
Article
Publication date: 1 December 1998

Abstract

Details

Sensor Review, vol. 18 no. 4
Type: Research Article
ISSN: 0260-2288

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Article
Publication date: 26 June 2009

Mohammed Omar, Yi Zhou, Eric Planting, Rohit Parvataneni and Stephen Hung

The purpose of this paper is to present a combined scheme of active laser‐based triangulation and a morphological edge detection, to quantify features dimensions (width…

Abstract

Purpose

The purpose of this paper is to present a combined scheme of active laser‐based triangulation and a morphological edge detection, to quantify features dimensions (width and depth) over smooth plastic surfaces. The inspected target is an automotive polyethylene, optically black fender, with average roughness of 1μm, while the sought features are mold sinks with depth variations of 0.3‐1.0 mm and a width of ∼3 mm.

Design/methodology/approach

Several non‐contact scanning and reconstruction optical modalities are discussed along with its associated noise for current application; such techniques include interferometry and triangulation. The proposed system projects a linear coherent illumination and scans its reflection profile to infer the reflected component position using trigonometry and its width using a Sobel morphological operator. The retrieved dimensions are then reconstructed into feature boundaries that enable a depth and width quantification.

Findings

The proposed setup and processing are validated through experimental scans of actual molded fenders with artificial deviations. The proposed system accuracy is then analyzed and its spatial resolution is found to be 0.14 mm using the current charge‐coupled device format of 640 × 480. Additionally the proposed system is benchmarked against a commercial 3D stereo‐based scanner; proposed system proved to be more accurate with faster scanning rates.

Research limitations/implications

The post processor combines the predicted width and depth values in real‐time to synthesize a 3D surface profile for sought features, with a resolution of 0.14 mm, an accuracy of 0.09 mm, and a repeatability of 0.11 mm. The proposed scheme is customized to current laser illuminant and to the plastic surface profile, which further modifications for other illuminations and roughness values.

Originality/value

New image processing code is used to reduce the laser speckle effect and the moving mechanism vibration using a moving Gaussian illuminant and a double thresholding scheme coupled with sequential averaging, respectively.

Details

Sensor Review, vol. 29 no. 3
Type: Research Article
ISSN: 0260-2288

Keywords

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Article
Publication date: 1 April 2001

Ibrahim Hassan and Jin Zhang

Investigates image search engines (ISEs) on the Internet. A total of 23 ISEs were examined in an attempt to investigate, evaluate, and characterise their common features…

Abstract

Investigates image search engines (ISEs) on the Internet. A total of 23 ISEs were examined in an attempt to investigate, evaluate, and characterise their common features. Each individual ISE was evaluated against the common features. Attempts to summarise the most comprehensive and complete ISE by looking at their significant features.

Details

Online Information Review, vol. 25 no. 2
Type: Research Article
ISSN: 1468-4527

Keywords

Content available
Article
Publication date: 1 March 2001

Abstract

Details

Sensor Review, vol. 21 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

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