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Welcome to issue #27-
Welcome to our third year of information and education for structural vibration and dynamic calibration professionals.  Our goal is to provide a few "bite size" pieces of information each month to keep you up on the latest in the industry.  Please, have a look (like thousands of your industry colleagues do each month!), share it with a co-worker and check the archive links below where you'll find all the back issues with their wealth of information.
Accelerometer Temp Extremes
Tip of the Month
In shock calibration, a small amount of material with suitable damping (like felt or rubber) placed at the impact surface helps to mechanically filter out high frequencies to avoid ringing the shock sensor's sensing element resonances.  This provides for a smoother output pulse and consistency in the calibration.  Clean excitation is always an advantage when comparing the sensor under test and the ICP® reference standard.
Quick Links
Newsletter Archive
sensor & cal tips #23 - Decoding accel specs; Quality system deficiencies
sensor & cal tips #24 - Summary links of best articles in prior editions grouped by topic
sensor & cal tips #25 - Is my shaker good enough?
sensor & cal tips #26 - high temp vibration and hammer calibration
Archived sensor & cal tips - all the back issues

Cost and Considerations of Calibration in Aerospace and Defense

AerospaceNo where is the price of product or mission failure as high as it is in the aeroapce and defense markets.  A satellite failure can cost hundreds of millions of dollars, while an aircraft or military failure can cost incalculable value in the loss of lives.  In response to this inherent market pressure, an extreme level of confidence is required of the test and data integrity.  And, as with all measurement situations, confidence starts with the integrity of the calibration.  Clearly confidence is the key.  This drives aerospace and defense (A&D) organizations to have heightened and specific needs in terms of accuracy, reliability and reputation in their sensor calibrations.  This month we'll outline some of the details to filling these needs in A&D vibration sensor calibration...
Click to read more about calibration in aero and defense

New developments in Shock sensing

ICPR circuit blockThe last decade has seen a major shift in the specialized use of Micro ElectroMechanical Systems (MEMS) based accelerometers.  Most people are familiar with the millions of low cost, low resolution MEMS accelerometers that have made their way into iPhones®, game controllers and automotive air bag deployment systems.  However, many people are not aware of the highly specialized MEMS accelerometer designs developed to meet the unique and stringent requirements of A&D applications like pyrotechnic shock (launch vehicle stage separation), munitions penetration, blast loading, as well as commercial applications like pile driving, down hole oil exploration and product drop testing.  In scanning the industry literature this month, I was fascinated to learn of a clever hybrid of traditional 4 wire bridge signal conditioning adapted for simplified 2 wire ICP® operation...
Click to learn more about shock sensing
The Modal Shop is celebrating its 20th Anniversary in 2010.  We hope that you've enjoyed our newsletter again this month and its educational content over the last few years.  No where like the calibration field is certainty and reliability more important. We're here to serve you with all your dynamic sensor and calibration needs... whenever you need help!
Mike Lally signature
Michael J. Lally
The Modal Shop
A PCB Group Company