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Metrology The Science of Measurement. 164 Education Liaison & Outreach. Let’s take a trip back in time…. Prehistoric people didn’t have time to measure. But over time…. people started growing food. and developing permanent settlements. So, they needed a system of measurement….

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Metrology The Science of Measurement

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Metrology the science of measurement l.jpg

MetrologyThe Science of Measurement

164 Education Liaison & Outreach

NCSL INTERNATIONAL

SERVING THE WORLD OF MEASUREMENT


Let s take a trip back in time l.jpg

Let’s take a trip back in time…

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Prehistoric people didn t have time to measure l.jpg

Prehistoric peopledidn’t have time to measure

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But over time l.jpg

But over time….

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People started growing food l.jpg

people started growing food

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And developing permanent settlements l.jpg

and developing permanent settlements

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So they needed a system of measurement l.jpg

So, they needed a system of measurement…

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Or there would be mayhem l.jpg

or there would be mayhem!

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History of measurement l.jpg

History of Measurement

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Egyptian Cubit

  • Used to build pyramids

  • Dependent on the pharaoh

  • Missed calibration was punishable by death!

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Fast-forward 5000 years to current measurement systems

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International System

of Measurement

Metric System (SI)

SEVEN BASE UNITS

MassKilogram (kg)

LengthMeter (m)

TimeSecond (s)

TemperatureKelvin (K)

Electric CurrentAmpere (A)

Amount of SubstanceMole (mol)

Luminous IntensityCandela (cd)

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Metric System (SI)

  • Simple to use

    • Bases of ten

  • All other units derived from primary seven

    • For example: V = cm3 = 1 mL

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Now, a couple of definitions…

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Metrology

“the science that deals with measurement”

Measure

“to determine the dimension, quantity or capacity of something”

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Measurement Result

Potential Value

Metrology Concepts

Uncertainty

  • Value assigned to a measurement result that characterizes how well it is known/unknown

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NMI

Inaccurate Measurements

You, the Consumer

Metrology Concepts

Traceability

  • Unbroken chain of comparisons to the SI units, all having stated uncertainties

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Metrology Concepts

Calibration

  • Set of operations that establish the relationship between values of quantities indicated by a measuring instrument and a reference standard

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Calibration Engineer

Calibration Technician

Metrologist

  • Designs and runs measurement calibrations & tests

  • Analyzes the results

  • Determines the final accuracy of the device under test

Metrologist

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Metrology Careers

Scientific Metrology

  • Organization and development of measurement standards and their maintenance (highest level)

NIST Atomic Clock

Accurate to 1 s in 20 million years

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Metrology Careers

Industrial Metrology

  • Adequate functioning of measurement instruments used in industry as well as production and testing processes

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Metrology Careers

Legal Metrology

  • Measurements that influence economic transactions, health and safety

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Who Needs Accurate Measurements?

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Pharmaceutical Industry

  • Metrology laboratories test weights and volume standards for pharmaceutical companies

  • Products include medicines like aspirin, antibiotics, vaccines, insulin, & vitamins

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Defense Industry

  • Metrology laboratories test standards for many military and defense companies

  • These companies make the guidance systems for the Patriot missiles and other things that are

top secret

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Space Station, Satellites….

  • Metrology laboratories test standards for many companies that provide parts of the space shuttle

  • These parts include the metal, heat shield, electronics, fabrics, o-rings, optics, and tires

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Retail Measurements

  • State metrology laboratories test standards used to test retail scales and meters

  • These include gas pumps, produce scales, milk, bread and other packaged items, and price scanning systems

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Who Needs Accurate Measurements?Everybody!

Weights and Measures measurements

affect more than $6.6 trillion of the $13.2 trillion

U.S. GDP (1996)

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Interested in Metrology?

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Interested in Metrology?

“Metrology community is facing a shortage of

qualified, trained metrology personnel across the U.S.”

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For More Information

NCSL International (NCSLI)

www.ncsli.org

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Special Thanks to FreeFoto.com, www.sxc.hu

Developed by

NCSLI Committee 164


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Special Thanks to

FreeFoto.com, www.sxc.hu, Microsoft Office Clipart

Presentation Developed by

NCSLI Committee 164

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Questions, Comments, Suggestions?

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