SAW Technology


Questions and answers on our patented Transense sensors

Is the SAW sensor affected by stray magnetic fields?

Unlike some torque measurement sensors, SAW sensor technology is not affected by magnetic fields.

How small is the sensor?

The actual SAW sensor is approximately 8 x 6mm by 2mm thickness.

What is the operating temperature range of the SAW sensor?

Our SAW sensor standard operating temperature range is from -40⁰C to 125⁰C. In some applications extending the upper limit to 150⁰C may be possible.

How small are the electronics?

Excluding passive components, and voltage regulators, there are 2 key components on the SAW reader electronics printed circuit board (PCB). These are the Radio Frequency Application Specific Integrated Circuit (RF ASIC) and the Digital Signal Processor (DSP). These components are 7mm x 7mm and 14mm x 14mm respectively. The electronics may be supplied as a standalone PCB or integrated into the customers electronics. The small size of the electronics also enables them to be integrated into different form factors.

Is the technology designed for volume applications?

Yes, the sensor and electronics are designed for volume applications and is a USP for our SAW Sensor Technology. The SAW devices are designed to operate in specific RF frequency bands and the manufacturing process is capable of high volume. Additionally, the use of an ASIC which has been designed for the Transense Technologies electronics is also a volume designed component.

Does the shaft need to be made of special steel?

Unlike some torque measurement sensors, the shaft does not need to be made of special steels, magnetised or incorporate a torsion bar. The customers original materials and components may be used. Alternative materials may also be considered as we are not restrictive to steel. Some minor modifications maybe be required to ensure the strain applied to the SAW sensor is optimal and the creation of a small flat surface to adhere the quartz SAW device.

What is the accuracy?

Due to the small number of system hardware building blocks and adaptable software design, the Transense SAW sensor technology is able to adapt to the customers critical parameter and commercial constraints. An overall torque measurement error of better than 1% full scale can be achieved.

Is the sensor affected by mechanical shocks or vibration?

When used within the defined operating limits the sensor is not affected by mechanical shock or vibration.

How rugged is the sensor? Is it affected by dust?

Unlike some optical torque sensors SAW torque sensors are not affected by dust and may also be used in a liquid environment such as transmission oil. The sensors are also very rugged and have exceeded expectations when qualified for use within military aircraft applications.