Abstmct-The air-coupled transmissionof 2.3 MHz micromachined, narrow band devices operating at longitudinal ultrasonic waves through aluminum is 2.3 MHz, These microfabricated ultrasonic transreported. Microfabricated ultrasonic transducers are used to emit and receive the ultrasonic tone ducers (MUTs) have a dynamic range of 110 dB, burst. The signal at the receiver is so dB above and are th...

This paper presents a novel ultrasonic sensing system for autonomous mobile systems. We describe how wide-angled ultrasonic transducers can be used to obtain substantial information of the environment. This can be achieved by exploiting the overlapping of the detection cones from neighbor sensors. The ultrasonic sensing system also allows the detection of multiple echoes from different echo pat...

In the post genome-sequencing era, physiological phenotyping of genetically engineered mice is critical to further our understanding of the functional consequences of specific genetic defects. We have developed a 40-50 MHz ultrasound biomicroscopy-(UBM) guided, pulsed Doppler system for the sensitive detection of in vivo blood velocity waveforms in the mouse embryonic cardiovascular system. Our...

A photoacoustic tomography system (PAT) using virtual point ultrasonic transducers was developed and applied to image a monkey brain. The custom-built transducers provide a 10-fold greater field-of-view (FOV) than finite-aperture unfocused transducers as well as an improved signal-to-noise ratio (SNR) and reduced artifacts rather than negative-lens transducers. Their tangential resolution, radi...

In order to obtain the highest performances requested by the safety authorities for ultrasonic inspections, in terms of flaw characterization, the CEA (French Atomic Energy Commission) has developped the F.A.U.S.T. (Focusing Adaptive UltraSonic Tomography ) system, supported by the french Institute for Nuclear Protection and Safety (IPSN). This technique is based on phased array transducers dyn...

In all ultrasonic material evaluation methods, transducers and sensors play a key role of mechanoelectrical conversion. Their transduction characteristics must be known quantitatively in designing implementing successful structural health monitoring (SHM) systems. Yet, their calibration verification have lagged behind most other aspects SHM system development. This study aims to extend recent a...