Thus, by varying the delay in the reference arm, differing sample depths can be probed. A PC will be used to collect and analyze the data. This acoustic technique will be used to conduct studies of fundamental and practical importance. This complete and quantitative investigation will be of great value and may lead to direct applications in medical imaging or remote sensing in geology. Phonon Correlation Spectroscopy Experimental configuration to be used in the phonon time-resolved correlation spectroscopy experiment is similar to that shown for the optical analog.
Acoustic pulses are focused to a small volume within the highly scattering sample.
The scattered sound is collimated, temporally gated, and averaged. Temporal intensity distributions are illustrated. The acoustic correlation spectroscopy experiment will enable the investigation of scatterers that are significantly larger than those used in the optical domain, due to the difference in the wavelength of the respective radiation fields. Additionally, experiments can be done in a somewhat more controlled manner, by driving the scatterers with low-frequency acoustic waves to simulate the Brownian motion observed optically. Rather than adjusting temperature and viscosity, the experimenter can control the motion electronically, allowing a study of a broader range of motions.