2D transmission imaging with a crossed-array configuration for defect detection

Two-dimensional time of light and attenuation measurements offer unique opportunities in nondestructive ultrasound testing for defect detection. However, unavailability or costs for 2D matrix transducers usually require a mechanical scanning procedure with a single element transducer to acquire 2D projections. This time and cost intensive process is not applicable for high speed testing of e.g. low cost devices. We propose a concept of a crossed-array configuration for 2D transmission imaging in terms of time of light and attenuation measurements. A mechanical setup and a data acquisition system have been developed to evaluate the potential of this concept. Our results show, that ultrasound crossed-array transmission imaging has a great potential in terms of time of light and attenuation measurements for defect detection in non-destructive testing, e.g. for detection of delaminations. With an appropriate data acquisition system transmission images can be acquired with frames rates in the kHz range. Therefore, crossed-array transmission imaging is a unique, cost efficient procedure with a good resolution for high speed testing in industrial applications.