Scanning acoustic microscope

Details Scanning acoustic microscope Scanning acoustic microscope

G - Physics

03

B

349/35

G03B 42/06 (2006.01) G01N 29/06 (2006.01) G10K 11/02 (2006.01)

Patent

CA 1225733

- 1 - Abstract: In an acoustic microscope an ultrasonic beam is projected onto a sample through a propagating medium by an ultrasonic transducer having a short focus. Reflected acoustic waves from the sample are detected by the transducer, and a microscopic image of the sample is obtained by scanning the sample mechanically in two dimensions. The invention provides a cover member interposed between the sample and the propagating medium and having an acoustic impedance higher than those of the sample and medium. The intensity of the reflection signal depends upon multipath reflection within the cover member, and an intense reflection signal is obtained even for a sample that differs only slightly in acoustic impedance from the propagating medium. This enables such a sample, e.g. biological tissue, to be examined with a high signal-to-noise ratio in an acoustic microscope of the reflection type, whereas in the past this has necessitated the more complicated transmission type.

471796

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