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AO Through Transmission Ultrasound (TTU) Imagers allow instant x-ray like ultrasound imaging of composite parts in near real time.

The test part is illuminated from one side using a large area transducer (sound source) and transmitted ultrasound is detected by the super high-resolution area detector (AO sensor) and instantly converted into an optical image.  A video camera records the image on the AO sensor for computer storage and further image enhancement using proprietary algorithms. 

The standard AO-TTU imager is available with a field of view of 3"x3" but imagers with field of view up to 12"x12" can be ordered.  The standard operating frequency of the imager is 3.8MHz but higher operating frequency can be ordered.

AO-TTU imagers are available as standalone products, as a retrofit to existing C-scan systems, and for implementation into dedicated NDI systems with full motion control (e.g. x-y slides, gantry, turn-tables, and robot). 

AO TTU Imagers can also be configured to inspect a composite part at various projection angles (see video clips). 

The AO-TTU imagers are ideally suited for fast and low-cost NDI of small composite parts; e.g.flats, mildly curved,  L-shaped, etc.  They may also be ideally suited for fast and low-cost NDI of long parts; e.g. stringers (see video clips). 

AO sensor Viewing Head

Sound Source

AO-TTU Imagers

NDE Systems


The inspection speed or throughput of the Acoustography NDE system depends on a number of factors such as:

  • FOV (e.g. 3"x3", 6"x6" or 12"x12") of the AO-TTU Imager employed
  • Number of AO-TTU Imagers employed (e.g single imager or multiple imagers)
  • The motion control system employed for part scanning

Please Contact Us for more details.


To perform NDE, one or multiple AO-TTU imagers can be employed in a system with appropriate motion control and an immersion tank. 

AO-TTU imagers can be implemented into dedicated NDI systems with full motion control (e.g. x-y slides, gantry, turn-tables, and robot); see examples below.

Long parts (e.g. stringers) can be inspected by providing a special leaky tank.  A sequence of images is taken as the part is moved (see video clip below). 

Parts can be imaged at various projection angles to accommodate complex shape by rotating the AO-TTU imager (see video clip below).

For small composite brackets or clips that are smaller than the AO TTU imager field of view, the part can be simply rotated and imaged at various angles.