A methodology is presented for health monitoring and subsequent inspection of critical structures. Algorithms have been developed to detect and approximately locate damaged regions by analyzing signals recorded from a permanently mounted, sparse array of transducers. Followup inspections of suspected flaw locations are performed using a dual transducer ultrasonic approach where a permanently mo...

A conformable phased array device is being developed that allows reliable ultrasonic inspection of components with irregular surfaces. The device uses a standard linear phased array transducer, which is coupled to the surface under test by a water path, encapsulated by a low loss, synthetic rubber membrane. A comparison of results obtained using conventional ultrasonic techniques and the confor...

non-destructive ultrasonic testing is one of the methods utilized to evaluate quality of agricultural produce. transducers used in this method are made for basically industrial applications. since ultrasonic attenuation of waves in agricultural produce is very high, industrial transducers cannot be used in agriculture and needs to be modified. this is done with horns that concentrate energy on ...

The focal point of a high-numerical-aperture (NA) ultrasonic transducer can be used as a virtual point detector. This virtual point detector detects omnidirectionally over a wide acceptance angle. It also combines a large active transducer surface and a small effective virtual detector size. Thus the sensitivity is high compared with that of a real point detector, and the aperture effect is sma...

Poisson’s ratio has not received much attention because of its narrow range of measured values and difficulties in measurement. In previous work, genuine non-destructive evaluation method of characterizing weld-zone using Poisson’s ratio distribution was proposed. The method was to use immersion ultrasonic testing for measuring longitudinal and transverse wave speeds simultaneously. In present ...

In this paper, the design considerations of a mixed-signal integrated circuit for a 2D matrix ultrasonic transducer will be presented. The IC and the matrix transducer will be put into the tip of a transesophageal (TEE) probe for 3D echocardiography. The challenges associated with the interface electronics include: addressing the huge amount of elements, do the beam steering in the transmission...