Scanning Acoustic Tomography (SAT)

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Scanning Acoustic Tomography is a non-destructive technique that analyses the structural composition of a material. It is used to detect hidden defects and voids in materials. It provides three-dimensional images.


Scanning Acoustic Tomography Technique

A specimen’s structural composition can be determined through scanning acoustic tomography. In this test, sound waves are focused on the specimen through transducers. The resulting speed and energy of the reflected wave are measured to determine the structural properties of the specimen. The test is also called Scanning Acoustic Microscopy (SAM) and Acoustic Micro Imaging (AMI).

This failure analysis technique is utilized to detect and procure three-dimensional images of structural faults, voids, cracks, abrasion, etc. in electronic components, ceramics, resins, and metals. In terms of resolution, scanning acoustic tomography provides a lateral resolution lower than 30 μm and a vertical resolution of a few nanometers. 

Video 01: Scanning acoustic tomograph

Common Uses of Scanning Acoustic Tomography

  • Detection of damage in adhesive bonds.
  • Analyzing the porosity of aluminum casting.
  • Detecting void and cracks in semiconductors.

Advantages of Scanning Acoustic Tomography

  • It is a non-destructive technique.
  • It can detect submicron delamination.

Limitation of Scanning Acoustic Tomography

  • The test is time-consuming.
  • It is an expensive test.
  • Large equipment size.

Industrial Application of Scanning Acoustic Tomography

  • Semiconductors
  • Automotive
  • Coating and adhesives
  • Medical devices
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