Csir

Jeremy Rex Wallis

Philip Wayne Loveday

Frederik A Koch

David Ronald Jones

Robert Henry Sinclair

Jonathan Du Pre Le Roux

Michael Yuri Shatalov

Johannes Nicolaas Bothma

A strain/electrical potential transducer ( ) includes a rigid base ( ), a rigid beam ( ) hinged to the base ( ) at ( ), an elongate stack ( ) of dielectric substance, e.g. piezoelectric material, generally parallel with the beam ( ) and hinged to the base at ( ), and a rigid link ( ) interconnecting ends of the beam and stack remote from the base ( ). The transducer can be operated as a displacement generator by applying potential difference to the stack ( ) via contacts ( ) to strain the stack ( ) and to cause amplified, transverse displacement as shown at ( ). Conversely, the transducer can be operated as a sensor. Displacement at ( ) causes strain in the stack ( ) which generates a potential difference at the contacts ( ). Composite transducers are disclosed. A manipulating device in the form of an arrangement of displacement generators and use thereof for microscanning are disclosed.

Strain/electrical potential transducer

A displacement generator ( ) has a housing ( ) defining a chamber ( ) containing an incompressible liquid ( ). A port ( ) of the housing ( ) is closed by a movable member ( ). Within the chamber ( ), opposing, convex, flexible walls ( ) form an internal modulating chamber ( ), which optionally contains a compressible gas. Opposed ends of the walls ( ) can be displaced toward and away from each other by a motion transducer, e.g. a stack of ceramic piezoelectric members ( ), respectively to pressurize and depressurize the chamber ( ) and thus to displace the member ( ) to and fro to form an output of the displacement generator.

Generating displacement and theroacoustic refrigerator

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Pretoria, South Africa

Jeremy Rex Wallis