21 July 1998 Smart audiosonic contact impedance sensor for NDT of elastic polymers
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A nondestructive identification system for diagnostics of rubberlike materials has been developed. The system is based on the simultaneous contact impedance and compliance test conducted at two different sampling frequencies which correspond to the dynamic and quasistatic loadings, respectively. Measurements are taken by a piezoactive contact impedance tester which is a standing wave device registering the leakage of acoustic flow from the actuator via indenter into loaded specimens. Lame's elastic constants, density and rheological parameters of specimen are well correlated with a change in the output signal obtained from the sensor. Experimental data are processed by means of digital filtering, autoscaling and polynomial fitting. The LP filtered data, which correspond to the transient period of loading, are fitted with the dynamic model consisting of several Voigt's elements connected in series. Furthermore, the non-filtered data sampled at high frequency, which correspond to the quasistatic loading, are compared with the database.
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Antanas Daugela, Antanas Daugela, Hiroshi Fujii, Hiroshi Fujii, } "Smart audiosonic contact impedance sensor for NDT of elastic polymers", Proc. SPIE 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (21 July 1998); doi: 10.1117/12.316964; https://doi.org/10.1117/12.316964

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