Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
A new type of acoustic microscope or imaging device, to be called an acousto-acoustic microscope or imager, resolves the opposing requirements of high resolution and high detection sensitivity by exciting and detecting at different wavelengths. Also acoustic absorptions are detected with zero background. The principle of the acousto-acoustic microscope is indicated in the figure. A high-frequency acoustic transducer is excited by a high frequency electrical wave that is slowly amplitude-modulated. Using an acoustic lens, the high frequency amplitude-modulated acoustic wave emitted from the transducer can be tightly focused onto the sample, since the wavelength is short and diffraction is small. This provides high spatial resolution.