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Five 3-MHz Therapeutic Ultrasonic (TUS) devices with their respective transducers were employed to study the relationship between the transducer Effective Radiation Area (ERA) and the area of the thermal image generated by irradiating a thermochromic test body. The resulting relationship was linear, in agreement with previous work.
This paper presents a thermochromic test body to qualitative evaluate the Effective Radiation Area (ERA) of Therapeutic Ultrasound (TUS) devices. The thermal areas produced by three transducers are measured and compared to the ERA of the same transducers measured according to the IEC 61689 standard. A linear relationship was obtained between both kinds of areas suggesting that a quantitative relation...
This letter proposes an efficient method based on the steered-response power (SRP) technique for sound source localization using microphone arrays: the refined volumetric SRP (RV-SRP). By deploying a sparser volumetric grid, the RV-SRP achieves a significant reduction of the computational complexity without sacrificing the accuracy of location estimates. In addition, a refinement step improves on...
The present work evaluate the heating pattern of therapeutic ultrasound using immersion technique in a phantom of fat tissue made of silicone in different distances. Five tests were performed in each of six positions: 0, 1, 2, 3, 5 and 10 cm apart from the transducer surface, at 1 MHz, continuous mode and effective intensity 1.05 W·cm−2 for 180s. In the most superficial thermocouple, there was decrease...
This paper presents the procedures for the wind speed measurement using ultrasonic transducers. The wind speed measurement is based on the time-of-flight (ToF) ultrasonic estimation that has been estimated using the Extended Kalman Filter (EKF) algorithm. For this purpose it was developed the dynamic system model in state space and was analyzed the convergence of the EKF algorithm. Simulation results...
NEMO-SN1, located in the central Mediterranean Sea, Western Ionian Sea, off Eastern Sicily Island (Southern Italy) at 2100 m water depth, 25 km from the harbour of the city of Catania, is a prototype of a cabled deep-sea multiparameter observatory and the first operating with real-time data transmission in Europe since 2005. NEMO-SN1 is also the first-established node of EMSO (European Multidisciplinary...
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