Related articles
Edit |
Discuss Article
Measurement
Measurement is the determination of the size or magnitude of something. Measurement is not limited to physical quantities, but can extend to quantifying almost any imaginable thing such as degree of uncertainty, consumer confidence, or the rate of increase in the fall in the price of beanie babies. Different kinds of quantity, however, are measured at different levels of measurement.
In physics and engineering, measurement is the process of comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the measurement results in at least two numbers for the relationship between the item under study and the referenced unit of measurement, where at least one number estimates the statistical uncertainty in the measurement, also referred to as measurement error (in a philosophical distinction). Measuring instruments are the means by which this translation is made.
For example, the unit for length might be a well-known person's foot, and the length of a boat can be given as the number of times that person's foot would fit the length of the boat.
- A measurement is a comparison to a standard. -- William Shockley
Metrology
Metrology is the study of measurement. A metric is a standard for measurement. The quantification of phenomena through the process of measurement relies on the existence of an explicit or implicit metric, which is the standard to which the measure is referenced. If I say I am 5, I am indicating a measurement without conveying an applicable standard. I may mean I am 5 years old or I am 5 feet high.
History
Laws to regulate measurement were originally developed to prevent fraud. However, units of measurement are now generally defined on a scientific basis, and are established by international treaties. In the United States, commercial measurements are regulated by the National Institute of Standards and Technology NIST, a division of the United States Department of Commerce.
The history of measurements is a topic within the History of Science and Technology. The metre (us: meter) was standardized as the unit for length after the French revolution, and has since been adopted throughout most of the world. The United States and the UK are in the process of converting to the SI system. This process is known as metrication.
Systems of measurement
Difficulties in measurement
Measurement of many quantities is very difficult and prone to large error. Part of the difficulty is due to Uncertainty, and part of it is due to the limited time available in which to make the measurement.
Examples of things that are very difficult to measure in some respects and for some purposes include social related items such as:
See also
External links
Miscellaneous
Measuring the ratios between physical quantities is an important sub-field of physics.
Some important physical quantities include:
Source | Copyright
|
 |
 |
|
Webmasters: Add your website here:
Readers: Edit |
Discuss Listings
Metrology World
Internet portal and marketplace for the measurement, inspection, and quality industries.
http://www.metrologyworld.com/
Digibotics, Inc.
Manufactures 'Digibot' 3D laser digitizing systems and offers contract scanning, reverse engineering and modeling, and inspection services.
http://www.digibotics.com/
Michigan Metrology
3D Surface texture finish roughness and wear measurement and analysis for industry.
http://www.michmet.com/
Metrology Instrument Services
Specialist UK based company provides services for roundness and surface texture measuring instruments. Sales, calibration, repair, upgrades, training, and custom software for special applications.
http://www.metrology.cwc.net/
Veeco Instruments Inc
Manufacturer of metrology tools, precision ion beam etching and deposition process equipment, leak detection and X-ray fluorescence systems.
http://www.veeco.com
MSI-Viking Gage Inc.
Distributor of a full range of measurement products.
http://www.msi-viking.com/
Renishaw
Manufacturer of touch trigger probes, non-contact probes, encoders, laser scales, performance measurement systems, digitising systems and spectroscopy equipment.
http://www.renishaw.com
Precision Devices, Inc.
Manufacturer of instruments for measuring surface finish, surface roughness, surface texture and roundness.
http://www.predev.com
Nederlands Meetinstituut
Independent group of companies active in measurement, calibration, testing, certification, training and consulting related to metrology and technology.
http://www.nmi.nl
Turbine Metrology LLC
Specialist in Circular Geometry Inspection (CGI) of gas turbine, jet engine, and automotive components. Paragon System, turnkey workstations, hardware, software, training, consulting.
http://tmetrology.com/
Doric Instruments
Manufactures industrial measurement instrumentation. Data loggers, digital panel meters, handheld calibrators, and temperature indicators. A division of VAS Engineering.
http://www.doric-vas.com/
RS Technologies Ltd.
Manufacture torque, torque-angle, and force transducers, data acquisition instrumentation. Applications include threaded fastener design, testing and analysis, assembly operations, tool calibration, and verification.
http://www.rstechltd.com/
Compact Instruments Limited
Manufacturer of digital optical hand tachometers, panel tachometers and ratemeters, together with appropriate sensor devices.
http://www.compactinstruments.co.uk/
Jaeger Enterprises
Consultations, education and training for metrology related issues by experienced physicists and metrologists.
http://www.jaegerenterprises.com/
Larson Davis
US firm designs, develops, manufactures, and markets acoustics and vibration equipment for structural dynamics, medical applications, and the government.
http://www.lardav.com/
Electromagnetic Sensor Solutions, Inc.
Offers position sensor applications including industrial automation, quality inspection and process control. Nondestructive evaluation and inspection design consultants.
http://www.emsensors.com
Mitutoyo America Corporation
Manufactures a full range of precision measuring instruments.
http://www.mitutoyo.com
DataMyte Division of Rockwell Automation
DataMyte precision measurement systems use SimulScan technology for fast, accurate collection of data from LVDT probes and other gaging devices. Provides data collection equipment for SPC applications.
http://www.datamyte.com/
Stratco Inc.
Metrology, calibration, precision measuring equipment. Gage repair, calibration, service, sales. Optical comparator sales, service, certification. Professional representation of Starrett, Brown & Sharpe, Mitutoyo, Mahr, Fowler, Flexbar, others.
http://www.gage-sales-repair-calibration.com
Digital Surf
Supplies metrology components to build equipment such as profilers, topography machines, scanning probe microscopes. Develops topography software.
http://www.digitalsurf.fr
Taylor Hobson
Manufacturer of metrology instruments, surface finish and form, electro-optical, dimensional and roundness gauges.
http://www.taylor-hobson.com/
Pratt & Whitney
Instruments measure linear dimensions to micro-inch accuracy and are usually found in the calibration labs of major manufacturers. A unit of Moore Measurement Solutions, a Siemens company
http://www.prattandwhitney.com
Midwest FlexSystems, Inc.
Provides the interfacing to connect any gauge to PCs and networks for SPC data collection including software.
http://www.midwestflex.com
European Metrology
Exports instruments for use in control and in workshops for mechanical industries, aeronautics, cars. Location in Southern France.
http://www.european-metrology.com/
ANV Measurement Systems
UK distributors of Rion sound and vibration measurement equipment.
http://www.noise-and-vibration.co.uk
HGR Industrial Surplus
Buy and sell used industrial equipment including machine tools, fabrication, cnc, test, inspection and material handling.
http://www.hgrindustrialsurplus.com
Florida Metrology
Dimensional and visual inspection products incl. gages, microscopes, CMMs, optical and precision measuring tools.
http://www.floridametrology.com
Solartron Metrology
Manufacture analogue and digital linear measuring LVDT gauging and displacement transducers and probes using contact methods with associated conditioning and display electronics.
http://www.solartronmetrology.com/
Edmunds Gages
Provides dimensional measurement gaging solutions from cylindrical gages to custom-engineered automatic gaging systems.
http://www.edmundsgages.com
Interferomet Ltd.
Specialising in manufacture of high precision metrological instrumentation for the measurement of length, angle, vibration as well as gas and liquid interference refractometry.
http://www.interferomet.com
Automation and Metrology Inc.
Distributor of percision industrial gaging systems with encoders and digital readouts.
http://www.auto-met.com/
The L.S. Starrett Company
Manufactures more than 5,000 variations of precision tools, gages, measuring instruments, saw blades for industrial, professional and consumer markets worldwide.
http://www.starrett.com/
Testar - Division of Marposs
Manufacturer of a full line of industrial metrology equipment for all phases of manufacturing.
http://www.testar.com
Lasers Inc.
Offer a range of services for accurate measurements of machine tool and robotic movements. Includes an overview of services and capabilities.
http://www.lasers-inc.com/
Dimitri Favvas Industrial Metrology Solutions
Consultant for industrial metrology and quality assurance. Past work includes major hydroelectric power generation projects in countried such as the US, Canada, China, South Korea and Brazil.
http://www.worldexperts.com/dfavvas/
Spectrum Metrology
Distributor of equipment for measurement of alignment, squareness, parallelism, level, flatness, straightness, angle and twist.
http://www.spectrum-metrology.co.uk
Geodynamik AB
Offers roller integrated systems for continuous compaction documentation and control.
http://www.geodynamik.com
Vigitek
Development and supply of automated print inspection systems. Information on products and services.
http://vigitek.com
Jayant Tools Traders
Manufacturers of industrial tools, wagner chaser dies, thread rolling dies, punches, metal slitting saws, micrometer, ring gauges, plug gauges, thread gauges, cutting tools, threading tools, fasteners.
http://www.gandhitools.com/
Digital Metrology Solutions
Providing dimensional and surface metrology systems integration, software, consultation and training. Surface metrology freeware available at website.
http://www.digitalmetrology.com
|
