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The many possible uses for BAT transducers can be broken into two general categories ...


1. in-air & reflection applications - in this category, ultrasound does not cross any gas/solid or gas/liquid interfaces. Instead, simple propagation through the gas (left figure below) or reflections from solid or liquid surfaces (right figure below) are of interest.




Schematic diagram showing "in-air" applications for BAT transducers in which simple propagation through a gas is of interest.

Schematic diagram showing reflection applications for BAT transducers in which reflections and interactions from solid and liquid surfaces is of interest.



examples of use:

                 examples of use:

  • measurement of gas properties (e.g., temperature, pressure, flow-velocity)

  • imaging of temperature and flow-fields in gases

  • characterization of suspended particulates in gases

  • other environmental & gas-analysis sensors


  • object detection and ranging

  • object motion detection

  • level-detection of liquid-surfaces

  • robotic imaging and room surveillance

  • imaging & gauging of parts for quality and process control in manufacturing industries

  • surface roughness measurements



2. non-contact NDT applications - in this category of application, ultrasound is generated and received in solid or liquid materials through an intervening air- or gas-layer (as shown in figure below-right). This has three significant advantages over conventional ultrasonic Non-Destructive Testing (NDT) methods. First, it allows the internal portion of solid & liquid materials to be inspected without contact. Second, it eliminates the need for liquid couplants in situations where they are either damaging to materials or impractical to maintain on large structures. And finally, it provides the potential for rapid scanning due to the elimination of the liquid couplant.


examples of use:

  • non-contact imaging of defects in materials (e.g., to detect delaminations or inclusions)

  • non-contact monitoring of thickness variations

  • non-contact measurements of the elastic constants of materials

  • non-contact materials characterization

  • quality and process control in manufacturing industries


Schematic diagram showing non-contact Non-Destructive Testing applications for BAT transducers in which ultrasound is coupled into solid and liquid materials through air- or gas- layers.





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