A Biological Displacement Transducer Using Viscous Coupling

概要

論文の詳細を見る
In the design of mechanical transducers for picking up the vibrations of the surface of a biological subject, it is often emphasized that the transducer should be convenient in the attachment, that it should retain constant characteristics in spite of the changes in its relative position to the surface, and that, in case unusual large disturbances come in because of unexpected motion of the subject, the transducer and the following electronic instruments should recover their normal functions rapidly. As an example of the transducers having excellent characteristics from these points of view, this paper considers a displacement transducer with a coupling by the viscosity of silicon grease. A small cylinder attached to the surface transmits the displacement, through the silicon grease filled in a very narrow gap, to the membrane with strain-guages. It is calculated and experimentally verified that, due to the nonlinear viscosity of the silicon grease, the effect of artefacts is greatly reduced. An experimental set-up of the transducer has the frequency response of 0.3 Hz to 20 Hz, and is found to be very convenient and useful in clinical uses such as plethysmography and for other purposes.
一般社団法人日本生体医工学会の論文