Techniques are described for estimating the propagation velocity through a surface acoustic wave sensor. In particular, techniques which measure and exploit a proper segment of phase frequency response of the surface acoustic wave sensor are described for use as a basis of bacterial detection by the sensor. As described, use of velocity estimation based on a proper segment of phase frequency response has advantages over conventional techniques that use phase shift as the basis for detection.
This invention was made under a CRADA (SC02/01645) between Minnesota Mining and Manufacturing Company and Sandia National Laboratories, operated for the United State Department of Energy. The Government has certain rights in this invention.