Articles techniques et présentations

In the field of electronic, electro-acoustic apparatus is one of the important applications. There is an acoustic class in the department of electronic engineering, Shibaura Institute of Technology. The class is “Acoustic systems” which opens in 2nd semester of 3rd year. To foster the ... En savoir plus

The simulation of a large acoustic cylindrical antenna made of numerous identical transducers is very often out of reach in terms of computational cost. Therefore the usual design procedure consist in optimizing the transducer standing alone, either in free field arrangement or sitting ... En savoir plus

For active Structural Health Monitoring (SHM), one popular sensor type is the piezoelectric wafer active sensor (PWAS) due to its multi-purpose application as actuator and sensor and its low cost. It is used to generate a wave field, which interacts with the structure and is recorded by ... En savoir plus

Photoacoustic (PA) imaging has matured into a clinical modality for tissue imaging and functional cancer cell research. It uses a pulsed laser to irradiate a region and generate a thermally-induced acoustic pressure wave that can be collected by an ultrasound transducer. The optical ... En savoir plus

Water calorimetry is employed to establish a primary reference standard for radiation dosimetry by measuring the temperature rises in a water phantom (a cube of about 30 cm x 30 cm x 30 cm) subjected to a beam of ionizing radiation.  We use COMSOL Multiphysics to model the system using ... En savoir plus

The acoustoelastic effect relates the change in the speed of an acoustic wave travelling in a solid, to the pre-stress of the propagation medium. In this work the possibility of assessing nondestructively the stress status in metal sheets, by using the acoustoelastic effect, is ... En savoir plus

A scheme for inductive wireless powering and readout of passive LC sensor is presented. The sensor’s inductor is designed as a planar square coil and is used as the power receiving component. The capacitor is connected directly to the inductor and it was designed as an interdigital ... En savoir plus

In our work, simulations of a piezoelectrical micromachined ultrasonic transducer compatible with CMOS-MEMS process are presented. The piezoelectric material of the PMUT is AlN sandwiched between two Al layers and a top Si3N4 passive layer. The piezoelectric and the metal materials have ... En savoir plus

Ultrasound is a promising green technology for the advanced oxidation process (AOP) since it adds no chemicals to the treated water. In this paper, COMSOL Multiphysics® was used as a tool to design and characterize an ultrasound irradiator with multi-stepped configuration, which aims to ... En savoir plus

生物组织的生理和病理结构发生变化时， 导致组织电导率发生变化。因此，通过检测组织电导率来及时发现组织结构生理和病理情况，可以为癌症早期诊断提供依据。磁声电成像(MAET)是一种新颖的医学成像方法，由于在成像过程中使用了超声激励和电阻抗电极检测，所以其图像具有超声成像的高分辨率和电阻抗成像的高对比度。本研究使用的接口有压力声学时域显式和电流，仿真中使用2 MHz，2个cycle的正弦脉冲驱动聚焦超声探头，求解时域显式压力声学方程，获得组织振动速度。然后在电流接口中设置外部电流密度，把速度洛伦兹项耦合进外部电流密度，使用接地和浮电势检测电极上采集的磁声电电压 ... En savoir plus