Transense Technologies is developing new instrumentation applications utilising its core wireless, passive Surface Acoustic Wave (SAW) measurement technology with GE. A Memorandum of Understanding was signed between Transense and GE in May 2015.
Transense is currently developing a wireless, real-time torque measurement system with General Motors (GM). It has the potential to improve vehicle driveability, reduce fuel consumption and improve transmission shift quality.
Transense develops and markets patent-protected sensor systems for measuring torque, temperature and pressure, wirelessly and without the need for batteries, using Surface Acoustic Wave (SAW) technology.
As no batteries or wires are required, the sensors can be used in applications that traditional sensors cannot, such as on rotating shafts or in environments where access to the sensors is difficult or potentially hazardous.
SAW devices, as deployed by Transense, are realised as crystalline quartz substrates (dies) typically 6 x 4 mm by 350 microns thick. On each die up to 3 resonators, with natural frequencies around 433MHz, are laid down in thin film aluminium, using photo-lithographic techniques. Each resonator comprises a central inter-digitated transducer (IDT) with a series of reflecting strips distributed on either side. Overall resonator dimensions are 2 to 3 mm long x 0.3 to 0.4 mm wide. The spacing between individual features in the IDT and reflectors is of the order of 2 microns so you need a microscope to resolve the fine detail. SAW resonators respond to both mechanical and thermal strain by changing their natural frequency of vibration..
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