LONDON (June 13, 2001) – Group Michelin has licensed an acoustic wave technology from a British firm for use in tire pressure warning devices, although the tire maker did not disclose details of how it intends to implement the technology. The technology—surface acoustic wave (SAW)—is under development by Transense Technologies P.L.C., a London-based firm.
The Transense sensor uses SAW technology in a diaphragm that is placed between the side of the sensor subjected to tire pressure and a sealed reference chamber. Changes in tire pressure cause the resonant frequency of one device to increase while the second device will decrease.
The change in the difference between these two frequencies is directly proportional to the difference in pressure of the tire and reference chamber.
The sensor, about ½-inch in diameter, is placed in all four tires and detects a fall in tire pressure, alerting the driver.
Transense said it had signed a worldwide licensing agreement with Michelin allowing the company exclusive use of its SAW technology and to license it to other tire companies.