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This presentation will focus on recent advances in spectrophone designs based on quartz-enhanced photoacoustic spectroscopy (QEPAS) and quartz-enhanced conductance spectroscopy (QECS) for highly selective and sensitive monitoring as well as quantification of trace gas species and nanomechanical analysis of materials [1–4]. QEPAS sensor technology is based on a new approach to photoacoustic detection...
In recent years, combining a ferroelectric ceramic and a polymer matrix to form a flexible composite with coupling properties in between that of two individual phases has been pursued for sensors in medical applications and hydrophones. For hydrophone applications, a useful piezoelectric material should have high piezoelectric voltage coefficient (g33), piezoelectric strain coefficient (d33) and high...
A numerical approach is presented for predicting the structure-borne seek noise in hard disk drives (HDDs) in time-domain. Rayleigh integral is adopted to relate the transient acceleration of top cover to its radiated sound pressure. A finite element modeling and simulation technique is employed to arrive at the transient vibration response, which is further used as the input for acoustic noise level...
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