Title :
Differential phase contrast acoustic microscopy
Author :
Routh, H.F. ; Pusateri, T.L. ; Nikoonahad, M.
Author_Institution :
Bio-Imaging Res. Inc., Lincolnshire, IL, USA
Abstract :
The acoustic counterpart of the Nomarski differential-phase optical microscope is described and demonstrated at 50 MHz. A phase sensitivity of 190 mV/degree with a noise floor at 10 mV in a 1 kHz bandwidth was measured for this instrument. This suggests that the minimum measurable height with this system is 22 Å. A variety of images obtained from metal surfaces and composite materials is presented
Keywords :
acoustic microscopes; acoustic microscopy; bandwidth; composite materials; metal surfaces; minimum measurable height; noise floor; phase sensitivity; Acoustic measurements; Acoustic noise; Bandwidth; Instruments; Noise measurement; Optical microscopy; Optical noise; Optical sensors; Phase measurement; Phase noise;
Conference_Titel :
Ultrasonics Symposium, 1989. Proceedings., IEEE 1989
Conference_Location :
Montreal, Que.
DOI :
10.1109/ULTSYM.1989.67101
