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Welcome to issue #39-

Hope you had a great October and let me say, "Welcome back!" to all our dynamic measurement professionals and industry readers.  My name is Michael Lally, and I'm part of the second generation in the PCB Piezotronics sensor family.  As part of my role as President of The Modal Shop, A PCB Group company, my goal is to bring you a quick dose of technology, tips and applications each month to help you make better dynamic measurements.  After scanning this month's sensors and calibration articles, please don't forget to check out our archive section on the left.  Each month, readers are sending me notes with "Wow! I didn't know there was that much helpful information on your website!", so please give it a look, pass it on and let me know what other topics you would like to see covered in future issues.
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Tip of the Month

Remember that the shaker transverse recommendation in the ISO standard 16063-11 for Laser Primary Accelerometer Calibration is 1% to 10 Hz, then 10% to 1 kHz and then 20% above.  This requires special air-bearing shaker selection and is even tighter than the 10% to 1 kHz and 30% above that is recommended in ISO 16063-21 Vibration Calibration by comparison to a reference transducer.

Quick Links
ISO TC 108 - Mechanical vibration, shock and condition monitoring
ISO TC 108/SC 3 - Use and calibration of vibration and shock measuring instruments

IMEKO - Thailand (November 21-25)

Previous Newsletter

sensor & cal tips #38 - Calibration Options and Practical Exciter Selection
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PCB Group Companies

Accelerometers and Dynamic Pressure Sensors for Extreme Environments

by Margie Mattingly, PCB Piezotronics

As featured in Test Magazine Oct/Nov 2010

Cryogenic Pressure SensorAccelerometers and pressure sensors for measurement in extreme environments require special consideration during design and manufacturing processes.  Specialized applications frequently require use of a single sensor model, which must be capable of operating over significantly wider temperature ranges - for example, -420 to +1200F (-251 to +649C) as in Figure 1 - while providing high accuracy, stability, and reliability.  Typical applications for high-temperature aerospace sensors include measurement on gas turbine engines both in-flight and in test cells, as well as rocket motors and thruster assemblies.  The same sensors might be required to withstand radiation and be used in monitoring vibration inside a nuclear power plant or on a space vehicle, or the cryogenic conditions of liquid propellants.

Click here to read more about Extreme Environments


Lowering the Barriers to Primary Calibration of Accelerometers

Laser Primary CalibrationWhile the ever lowering of uncertainty is the quixotic quest of the metrology industry, for certain laboratories the lowest possible uncertainty is a must.  Of particular note are National Metrological Laboratories, Primary Standards Laboratories (often serving branches of the Armed Services or National Labs), Accelerometer Manufacturers (there are over 150 now) and Accelerometer Calibration System Manufacturers (where there are still only just a few...).  Each of these organizations has a specialized metrology function in providing primary calibrations for accelerometers that will be used in precision accelerometer calibration systems as references or transfer standards as called out in ISO 16063-21.  In these cases, the best measurement uncertainties are needed because the reference, or transfer standard uncertainty, will be directly adding to the overall measurement uncertainty of the calibration system. This is critical since it is most often the single largest contributor to the system uncertainty.

Blast from the Past...

For those who may be new to our newsletter, we wanted to highlight an article from one of the first sensor & calibration tips newsletters - Overview of ISO 16063 Accelerometer Calibration Standards...

ISOWhile most are familiar with the sweeping implications of ISO 9000, many users are not aware of the level of detail available in ISO 16063 specifically covering accelerometer calibration.  This month we'll cover a basic overview of the framework of ISO 16063 governing Methods for the Calibration of Vibration and Shock Transducers.
As The Modal Shop continues to celebrate our 20th Anniversary, we invite you to visit our Facebook page and become a fan or follow us on Twitter.  We've been adding both our tradeshow schedule and information about recent events around The Modal Shop.  Come and see how we live some of our core values of "Total Customer Satisfaction, Innovation and Community"!
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20 Year StickerMichael J. Lally
The Modal Shop
A PCB Group Company