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Issue 137
Participating in continuing education programs and seminars is an excellent way to stay actively engaged in the technical community. PCB Piezotronics and The Modal Shop are both committed to providing  educational opportunities led by industry experts - learn more about several upcoming sessions  hosted in Depew, New York. We hope you'll join us there!
Understanding Mics: Externally Polarized vs Prepolarized  

When should prepolarized microphones be used for acoustic measurements? The microphone experts at PCB Piezotronics produced this helpful 'Tips from Techs' video to explore the differences between traditional, externally polarized microphones and modern, prepolarized microphones.
 

Tip of the Month

Q:  Is mounting my calibration shaker on the work bench a bad idea?

A:  Depends on your bench! Some rigid support benches are fine. Do a test sweep with a triaxial accelerometer mounted and look for resonances and frequencies showing transverse motion. In general, it is safest to move the shaker to an "elephant's foot" (a structurally rigid, solid pedestal) to reduce bench resonances and also place the excitation device at an ergonomically desirable height and location for the operator.

Why the Word 'Hermetic' is Important to Your Piezoelectric Sensors

One of the most significant investments for manufacturers of quality dynamic piezoelectric sensors (force, pressure, vibration) is the machinery to ensure a hermetic seal of the transducer casing from contaminants in the outside world. Specifically, this means the technology and equipment to produce the glass-to-metal seal in a hermetic signal cable connector, and also the laser welder to seal the finished transducer casing.

The sensor sealing is critical due to the high impedance signal path at the heart of the piezoelectric crystal transduction. A typical piezoelectric sensor signal starts as a high impedance charge collected...
 


Sincerely,
Aaron Goosman -  Lilian Golan  - Jesse Coy
Julie Dwyer - Mike Dillon -  Patrick Timmons -  Shannon Henize 

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