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Technologies
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Precision Measurements and Metrology Using Lasers
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Precision Measurements and Metrology Using Lasers

A special issue of Technologies (ISSN 2227-7080).

Deadline for manuscript submissions: closed (30 April 2014) | Viewed by 24406

Special Issue Editor

Dr. David Kerr

E-Mail Website
Guest Editor
Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough Leicestershire, UK
Interests: optical metrology; fringe analysis; digital image processing; industrial machine vision

Special Issue Information

Dear Colleagues,

Since its inception around 1960, the laser has found myriad applications in science, engineering, and medicine. The use of lasers in metrology includes the precise measurement of distance, velocity, acceleration, torque, strain, surface finish, and shape. For more than 50 years, the unique properties of laser radiation (i.e., coherence, narrow wavelength, low beam divergence and high intensity) have made lasers ideal for accurate and repeatable non-contact measurement. This special issue aims to publish new research and novel applications in all types of laser metrology and precision measurement. It is my pleasure to encourage both theoretical and empirical papers in this ever-expanding and exciting discipline.

Dr. David Kerr
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Technologies is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


Keywords

  • laser
  • metrology
  • speckle
  • interferometry
  • coherent
  • measurement
  • quality
  • precision

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Published Papers (3 papers)

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Research

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1087 KiB  
Article
A 100-m Fabry–Pérot Cavity with Automatic Alignment Controls for Long-Term Observations of Earth’s Strain
by Akiteru Takamori, Akito Araya, Wataru Morii, Souichi Telada, Takashi Uchiyama and Masatake Ohashi
Technologies 2014, 2(3), 129-142; https://doi.org/10.3390/technologies2030129 - 6 Aug 2014
Cited by 3 | Viewed by 6664
Abstract
We have developed and built a highly accurate laser strainmeter for geophysical observations. It features the precise length measurement of a 100-m optical cavity with reference to a stable quantum standard. Unlike conventional laser strainmeters based on simple Michelson interferometers that require uninterrupted [...] Read more.
We have developed and built a highly accurate laser strainmeter for geophysical observations. It features the precise length measurement of a 100-m optical cavity with reference to a stable quantum standard. Unlike conventional laser strainmeters based on simple Michelson interferometers that require uninterrupted fringe counting to track the evolution of ground deformations, this instrument is able to determine the absolute length of a cavity at any given time. The instrument offers advantage in covering a variety of geophysical events, ranging from instantaneous earthquakes to crustal deformations associated with tectonic strain changes that persist over time. An automatic alignment control and an autonomous relocking system have been developed to realize stable performance and maximize observation times. It was installed in a deep underground site at the Kamioka mine in Japan, and an effective resolution of 2 × (10−8 − 10−7) m was achieved. The regular tidal deformations and co-seismic strain changes were in good agreement with those from a theoretical model and a co-located conventional laser strainmeter. Only the new instrument was able to record large strain steps caused by a nearby large earthquake because of its capability of absolute length determination. Full article
(This article belongs to the Special Issue Precision Measurements and Metrology Using Lasers)
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610 KiB  
Article
Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air
by Souichi Telada, Akito Araya and Akiteru Takamori
Technologies 2014, 2(3), 115-128; https://doi.org/10.3390/technologies2030115 - 4 Jul 2014
Cited by 1 | Viewed by 5174
Abstract
A highly accurate two-color interferometer with automatic correction of the refractive index of air was developed for crustal strain observation. The two-color interferometer, which can measure a geometrical distance of approximately 70 m, with a relative resolution of 2 × 10−9, [...] Read more.
A highly accurate two-color interferometer with automatic correction of the refractive index of air was developed for crustal strain observation. The two-color interferometer, which can measure a geometrical distance of approximately 70 m, with a relative resolution of 2 × 10−9, clearly detected a change in strain due to earth tides in spite of optical measurement in air. Moreover, a large strain quake due to an earthquake could be observed without disturbing the measurement. We demonstrated the advantages of the two-color interferometer in air for geodetic observation. Full article
(This article belongs to the Special Issue Precision Measurements and Metrology Using Lasers)
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Review

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991 KiB  
Review
Applications of Optical Interferometer Techniques for Precision Measurements of Changes in Temperature, Growth and Refractive Index of Materials
by Rami Reddy Bommareddi
Technologies 2014, 2(2), 54-75; https://doi.org/10.3390/technologies2020054 - 5 May 2014
Cited by 31 | Viewed by 11438
Abstract
Optical metrology techniques used to measure changes in thickness; temperature and refractive index are surveyed. Optical heterodyne detection principle and its applications for precision measurements of changes in thickness and temperature are discussed. Theoretical formulations are developed to estimate crystal growth rate, surface [...] Read more.
Optical metrology techniques used to measure changes in thickness; temperature and refractive index are surveyed. Optical heterodyne detection principle and its applications for precision measurements of changes in thickness and temperature are discussed. Theoretical formulations are developed to estimate crystal growth rate, surface roughness and laser cooling/heating of solids. Applications of Michelson and Mach-Zehnder interferometers to measure temperature changes in laser heating of solids are described. A Mach-Zehnder interferometer is used to measure refractive index and concentration variations of solutions in crystal growth experiments. Additionally, fluorescence lifetime sensing and fluorescence ratio method are described for temperature measurement. For all the above techniques, uncertainty calculations are included. Full article
(This article belongs to the Special Issue Precision Measurements and Metrology Using Lasers)
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