Issue #105, July 2016

Welcome to the July edition of the Dynamic Sensors & Calibration Tips. Whether this finds you in the northern hemisphere sitting pool-side or in the southern hemisphere enjoying a nice fire, we have a list of curated vibration literature to help you decide what's next up to read. We are also bringing you the next installment from the Microphone Handbook. As always, we invite you to email topics of interest with us for future editions!

Curated Vibration Reading List

By Marco Peres, Product Manager

The Modal Shop Team is often asked for a list of resource texts in the field of vibration. It's made us contemplate what makes a useful technical book. With all the books available it can be difficult to compile a list. The book's basic organizing idea, the writing style and quality, the author's background, the approach to technical topics were all things to consider when creating this reference list. With all of that in mind click below for a list of six recommendations...

Click to read the full list
Selecting and Specifying Microphones
Excerpted from PCB Piezotronics' Microphone Handbook

Microphones measure broadband sound pressure levels from a variety of sources. When the microphone signal is post processed, the frequencies can be correlated with
the sound source, and if necessary, related back to the wavelength of the sound. Acoustical measurement of this sound, through the use of high precision condenser
microphones, provides a better understanding of the nature of the sound. In some applications there are a number of microphones that can work and measure the sound pressure level...
Tip of the Month

When a sensor or measurement channel calibration value is found to be in error, all data taken with that sensor or channel is invalidated. Without a definitive knowledge of when the damage or error occurred, all data taken after the last successful calibration is not reliable. For the most expensive of tests and structures, the sensors are calibrated before and IMMEDIATELY after the test, ensuring the measured data integrity.

Blast from the Past:
Calibration and Engine Vibration Monitoring Accelerometer Cable Challenges

So you think your work environment is tough? You have multiple projects, competing priorities, shifting deadlines and drastically limited resources. Well at least you have a padded chair, nearby coffee and an office/lab. Now imagine the "work environment" of an aircraft engine monitoring accelerometer...the environment can be: hot to 1200 deg F (650 deg C), wet to 100% humidity condensing, violent seeing shocks up to 1000 g and precarious often on cantilevered mounting brackets and snaking in a cable around components and through passages to the signal conditioning and/or engine monitoring unit (EMU). Sounds like an environment worse than the biggest earthquake, the hottest desert and the wettest rainforest...
Thanks for joining us for another issue of Dynamic Sensors & Calibration Tips. As always, please speak up and let us know what you like. We appreciate all feedback: positive, critical or otherwise. Take care!

TMS 25 Years

Aaron Goosman - Eric Seller - Mike Dillon - Patrick Timmons - Shannon Henize

Calibration Team
The Modal Shop, Inc.

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