19 April 2013 Dynamic calibration of pressure transducers with an improved shock tube system
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Abstract
The need for reliable dynamic calibration of pressure transducers is becoming increasingly more important, especially with growing demands for improved performance, increased reliability and efficient energy generation from the aerospace, defense and energy sectors – all while being mindful of low lifecycle cost, minimizing maintenance downtime and reducing any negative impact to the environment. State of the art piezoelectric (PE) and piezoresistive (PR) silicon MEMS pressure transducers specifically designed for harsh environments are answering the call to provide the necessary measurements for applications such as high temperature gas turbine engine health monitoring (both in-flight and land/marine based aero-derivative), high pressure blast studies/ordnance explosion optimization, low profile wind tunnel testing/flight testing, etc. However, these pressure transducers are only as valuable as the dynamic calibration they possess so that more understanding of the physical measurement can be ascertained by the end-user. The shock tube is an established laboratory tool capable of imparting near instantaneous pressure stimulus for the purpose of providing quantifiable dynamic calibration of pressure transducers. From a performance perspective, a vast amount of empirical data has been collected over fifteen years and used to model more accurately the one-dimensional gas dynamics occurring within a shock tube so that the time interval of the reflected shock – the most critical parameter in determining the transfer function for the pressure transducer under test – can be optimized for the largest frequency bandwidth over varying shock amplitudes. Accordingly, an introduction of an improved shock tube system offering both increased performance and ease of user operation is presented.
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David Wisniewiski, "Dynamic calibration of pressure transducers with an improved shock tube system", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 86924Q (19 April 2013); doi: 10.1117/12.2002595; https://doi.org/10.1117/12.2002595
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