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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 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

Mass Kilogram (kg)

Length Meter (m)

Time Second (s)

Temperature Kelvin (K)

Electric Current Ampere (A)

Amount of Substance Mole (mol)

Luminous Intensity Candela (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 l.jpg
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 l.jpg
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 l.jpg
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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