In this paper a measurement of static pressure in the wake behind circular cylinder for different Reynolds numbers is presented. For purpose, probe with built-in transducer was used. The main goal to describe unsteady field and determine frequency generated Von Kármán vortex street. conducted low speed wind tunnel 110 mm diameter. results were compared an RANS simulation.

The measurement of the acoustic pressure of a planar ultrasonic wave by light diffraction is well established. The ability to do similar measurements in the case of spherical waves has been doubted However, we show that the range of validity can be extended to the focal region of a spherical concave piezoelectric transducer. Light is passed through the focal plane of a spherical concave transdu...

Elevated intracranial pressure (ICP) is a significant problem in several forms of ischemic brain injury including stroke, traumatic brain injury and cardiac arrest. This elevation may result in further neurological injury, in the form of transtentorial herniation(1,2,3,4), midbrain compression, neurological deficit or increased cerebral infarct(2,4). Current therapies are often inadequate to co...

A method is introduced for using measurements made in water of the nonlinear acoustic pressure field produced by a high-intensity focused ultrasound transducer to compute the acoustic pressure and temperature rise in a tissue medium. The acoustic pressure harmonics generated by nonlinear propagation are represented as a sum of modes having a Gaussian functional dependence in the radial directio...

F OLLOWING the pioneering works of Yamakawa et al. (1953)1 and of Soulie (1954),2 Luisada and Liu (1957) 3 4 described a method of recording intracardiac sound vibrations utilizing the electric signal of a pressure transducer through differentiation and filtration. At about the same time, Lewis et al. (1957)5 used a small barium titanate element at the tip of an intracardiac catheter. More rece...

An actuation method for atomic force microscope ~AFM! cantilevers in fluids is reported. The radiation pressure generated by a focused acoustic transducer at radio frequency ~rf! ~100–300 MHz! exerts a localized force of controlled amplitude at a desired location on the AFM cantilever. This force can be used to measure the spring constant and other dynamic properties of the cantilever. Furtherm...

The design and optimization of high performance ultrasound imaging probes often needs a reliable model to provide performance estimates related to project upgrades. Finite Element Model (FEM) is the most powerful and comprehensive tool available for this application, but needs a very fine preliminary tuning procedure in order to obtain consistent results. This was described in our previous work...

We present a study investigating the electrochemical interface as a capacitive transducer for ultrasound sensor applications. The concept is demonstrated using a nanoporous Au layer as a sensing electrode. The sensing electrode was produced by dealloying of the Ag0.8Au0.2 bulk electrode yielding an Au layer with extremely high surface/volume ratio. This electrode configuration was tested agains...

an extended octagonal ring (eor) transducer was designed and developed to measure forces inside the compression chamber of a large square baler in different directions. the transducer was calibrated by applying forces in three directions simultaneously and independently. the sensor revealed excellent linearity along with small cross sensitivities. horizontal and vertical primary sensitivities o...