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Download fileMechanical structures for smart-phone enabled sensing
conference contribution
posted on 2015-04-24, 10:27 authored by Simon Lawes, Peter KinnellPeter KinnellThe paper presents a new strategy for sensor design
that is made possible by the usage of ubiquitous mobile devices
for signal capture, digitization, and data processing. The
approach taken is to design simple mechanical sensor elements
such that they produce a sensor output that is easily acquired by
a mobile smart device such as a phone or tablet computer. To
illustrate this concept, two mechanical displacement transducers
have been designed and tested. These sensors make use of
displacement amplification structures, Moiré pattern gratings
and a double-ended-tuning-fork (DETF) resonant structure. The
sensors produced either an acoustic or optical signal in response
to an input load or displacement, which can then be acquired
using the camera or microphone of a mobile device. The
computing power and connectivity of mobile devices makes a
wide range of processing, visualisation and storage techniques
possible at low cost. Using this technique an optical displacement
transducer with a range of 150 µm, and a resolution of <5 µm;
and an acoustic displacement transducer with a range of 20 µm
and a standard error of 0.14 µm, are demonstrated.
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- Mechanical, Electrical and Manufacturing Engineering