Condenser and Carbon Microphones—Their Construction and use&lt;!--&lt;xref ref-type="other" rid="fn1-10.5594_J16623"&gt;*&lt;/xref&gt;--&gt;

Jones, W. C.

doi:10.5594/j16623

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Using these materials, a proof of concept of DFG device has been developed and tested. Despite its preliminary design, the device already shows extremely promising performances including: a conversion efficiencies of up to 30% and converted energy densities of 63.8 mJ g 1 and 173 mJ cm 3 per cycle, referred to the employed silicone oil and acrylic elastomer, respectively. These figures of merit have been proved to be repeatable over a sequence of multiple cycles of operation.…”

Section: Discussionmentioning

confidence: 99%

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A new class of variable capacitance generators based on the dielectric fluid transducer

Duranti

Righi

Vertechy

et al. 2017

Smart Mater. Struct.

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This paper introduces the novel concept of dielectric fluid transducer (DFT), which is an electrostatic variable capacitance transducer made by compliant electrodes, solid dielectrics and a dielectric fluid with variable volume and/or shape. The DFT can be employed in actuator mode and generator mode. In this work, DFTs are studied as electromechanical generators able to convert oscillating mechanical energy into direct current electricity. Beside illustrating the working principle of dielectric fluid generators (DFGs), we introduce different architectural implementations and provide considerations on limitations and best practices for their design. Additionally, the proposed concept is demonstrated in a preliminary experimental test campaign conducted on a first DFG prototype. During experimental tests a maximum energy per cycle of and maximum power of has been converted, with a conversion efficiency up to 30%. These figures correspond to converted energy densities of with respect to the displaced dielectric fluid and with respect to the mass of the solid dielectric. This promising performance can be largely improved through the optimization of device topology and dimensions, as well as by the adoption of more performing conductive and dielectric materials.

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Section: Discussionmentioning

confidence: 99%

“…a capacitor whose capacitance can change significantly as a result of the application of a mechanical input. Such a change in capacitance makes it possible to sense displacements/forces/pressures [1], to produce actuation forces [2,3] or to convert mechanical energy into DC electricity [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A new class of variable capacitance generators based on the dielectric fluid transducer

Duranti

Righi

Vertechy

et al. 2017

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Utilizing graphite for pressure sensing has a long history; using “carbon button” microphones has been recorded more than 150 years ago. [ 42 ] These devices dominated the telephone industry for almost a century. Recently, numerous carbon‐based composites have been studied for their piezoresistive properties and many sensors are proposed or fabricated based on such materials.…”

Section: Introductionmentioning

confidence: 99%