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Welcome to issue #36-
Welcome to the summertime addition (for those of us in the northern hemisphere)!  My summer has turned a little rocky since my youngest son broke his ankle.  A quick surgery and two screws later, he's on the path to recovery, but bones take time to heal.  In other news (work and technology related), friend our Facebook fan page or find your favorite newsletter articles by clicking on the Newsletter Articles by Topic section in the left hand column of this page.
Accelerometer Temp Extremes
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Tip of the Month

When calibrating accelerometers using an air-bearing shaker, whenever possible, the sensor under test (SUT) should be stud mounted directly to the shaker armature to achieve the best performance.  If mounting to the tapped hole in the armature is not practical, a simple mounting adapter can be used.  Be sure to apply mounting grease between all mating surfaces.

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
NCSLi - Providence, RI (July 25-29)
Previous Newsletter
sensor & cal tips #35 - Accelerometer Technologies; Performance and Accelerometer Calibration
Newsletter Articles by Topic
PCB Group Companies

New Techniques for Bone Health Monitoring

Bone Health MonitoringSince we're on the topic of bones, here's a quick peek at an application where researchers in collaboration at both Ohio University and Stanford University are using Modal Shop vibration exciters and PCB impedance heads to assess bone structural integrity.  View photos of a test set-up of this new technique for bone health monitoring by clicking here.  The Modal Shop and PCB actively support universities throughout the world, helping create new vibration laboratories and enhancing existing dynamic measurement set-ups.
Click here to view photos of this new technique

The Internet's Top 10 Vibration Videos

Salt on table, vibrating at different frequencies produces a visual representation of the harmonic nodes.
Salt on vibrating table
Check out this list of Top 10 vibration related videos found on the internet.  The original list was compiled by Chris Mason at ProSig in their June 16, 2010 newsletter.  While on the topic of videos, check back on the TMS website often, each week we are adding new videos on a variety of topics from calibration to non-destructive testing.
Click here for the top 10 vibration videos on the web

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 - Transduction Types (Piezoelectric, Piezoresistive and Capacitive)...
Inside an AccelerometerAccelerometers are transducers that generate an electrical signal output as a result of a mechanical acceleration input to the unit.  The most common type of accelerometer operates by the piezoelectric effect.  Piezoelectric (PE) accelerometers are generally classified in two groups - low impedance voltage mode (for example, PCB Piezotronics trademarked ICP) or charge mode.  Other types of accelerometer transduction methods include piezoresistive (PR), based upon strain gage technology and variable capacitive (VC).
Click here for more information on transduction types
As The Modal Shop celebrates its 20th Anniversary, we invite you to visit our Facebook page and become a fan.  We've been adding both our tradeshow schedule and information about recent events around The Modal Shop.  Come and see our core value of "Community," both in the office and offsite, at work!
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20 Year StickerMichael J. Lally
The Modal Shop
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