Phased array

The probes are assumed to be of contact type but are otherwise quite arbitrary. To model the probe the traction beneath it is prescribed and the resulting boundary value problem is first solved exactly by way of a double Fourier transform. To get managable expressions a far field approximation is then performed using the stationary phase method. As to not be too restrictive the probe is if necessary divided into elements which are each treated separately. Keeping the elements small enough the far field restriction becomes very week so that it is in fact enough if the separation between the probe and defect is one or two wavelengths. As each element can be controlled separately it is possible to have phased arrays and also point or line focussed probes. [Pg.157]

Shear Horizontal (SH) waves generated by Electromagnetic Acoustic Transducer (EMAT) have been used for sizing fatigue cracks and machined notches in steels by Time-of-Flight Diffraction (TOED) method. The used EMATs have been Phased Array-Probes and have been operated by State-of-the-art PC based phased array systems. Test and system parameters have been optimised to maximise defect detection and signal processing methods have been applied to improve accuracy in the transit time measurements. [Pg.721]

D. Desruelles, O. Burat, G. Pierre, Inspection of tube using ultrasonic phased array probes, 14th World Conference on NOT, New Delhi, December 8-l3th 1996. ... [Pg.826]

Another important difference between bistatic and monostatic radar is that a directional receive antenna must scan at a non uniform rate to follow the position of the transmitted signal through space, a process known as pulse chasing. This can be very challenging for designs based upon mechanical scanning and hence an alternative is to use one or more electronically agile beams as in phased array radar. Such phased array antennas can be expensive and in some applications will prohibit the use of the bistatic technique. [Pg.6]

A.A. Tolkachev, B. A. Levitan, G. K. Solovjev, V. V. Veytsel, V. E. Farber. A Megawatt Power Millimeter-Wave Phased-Array Radar , IEEE AES Systems Magazine, pp. 25-31, July 2000. [Pg.266]

MMI) eouplers for the construction of three-dimensional multimode interferenee phased array (3D MMI PHASAR) demultiplexers. The 2D MMI coupler is thus studied in details and the results are used in the design of a 3D MMI PHASAR. The analysis of the 3D MMI PHASAR shows that there is an appreeiable performanee enhancement and size reduction compared to the planar MMI PHASAR... [Pg.281]

A.Yehia and D. Khalil, Design of a compact three-dimensional multimode interference phased array structures (3D MMI PHASAR) for DWDM applications, IEEE J. Set Top. Quant. Electron, (in press, 2005). [Pg.287]

M. R. Paiam, and R. I. MacDonald, Design of phased array wavelength division multiplexers using multimode interference couplers, A/ip/. Opt. 36, 5097-5108 (1997). [Pg.287]

Reverse phase arrays differ substantially from forward phase capture arrays (otherwise known as antibody arrays) because protein lysate itself is printed on the array as bait used to capture the specific antibody, rather than printing the antibody first to capture the protein from solution. Therefore, many hundreds of samples can be printed on the same RPMA, and hundreds of parallel or identical arrays can be printed at once using advanced robotics. Each RPMA containing the multiple samples, identifiable by their geographic location, is incubated with a unique and specific detection antibody. [Pg.193]

There are several important advantages RPMAs have over antibody arrays and other proteomic techniques such as immunohis-tochemistry or tissue arrays. Antibody arrays usually require a second specific antibody, made in a different species, for each captured protein to be visualized in a manner analogous to enzyme-linked immunosorbent assays (ELISA). Therefore, it becomes difficult to simultaneously optimize the antibody-antigen hybridization conditions for so many antibodies at once present on antibody arrays while minimizing nonspecific cross-reactivity and ensuring that proteins over a wide range of concentrations can be quantitated in a linear fashion (14). Antibody arrays also consume or require much higher inputs of protein than reverse phase arrays. With antibody arrays. [Pg.193]

The ability to respond effectively to an event will require first responders and HAZMAT teams to coordinate thousands of details. Development of new materials for advanced telecommunications and radar could greatly improve the current response standard. Materials that can lead to faster computers, higher-density storage, and more efficient telecommunications are vital. One example of a basic area of research that could have an impact on our ability to respond to a threat is wide bandgap semiconductors, used, for instance, in phased-array radars. The development of shipboard phased-array radar systems over the past few decades has provided the military with a very high degree of situational awareness with respect to airborne targets. [Pg.30]

MR phased array and parallel imaging, MRI RF-coil development has further blossomed.Phased-array receive coils can provide substantial increases in SNR for spectroscopic applications. Although most phase-array technology has been developed for studies and parallel imaging,... [Pg.125]

N. I. Avdievich and H. P. Hetherington, 4 T Actively detuneable double-tuned H/ P head volume coil and four-channel P phased array for human brain spectroscopy. /. Magn. Reson., 2007,186,341-346. [Pg.149]

The PR effect was first observed in 1966 as an undesirable effect in an EO crystal, LiNb03 [1], It was soon realized that this effect is reversible and its PR mechanism was then identified [2,3], These PR materials can be applied to high-capacity optical memories, dynamic hologram formations, massive interconnections, high-speed tunable filters, and true-time relay lines for phase array... [Pg.257]

An example of a dedicated sampling accessory is the parallel gas phase array (GPA) that was utilized in the gas phase effluent studies mentioned below. For... [Pg.147]

Mixer 16 [M 16] Electrical Phase-array Panel Micro Mixer... [Pg.54]

From this device, several sub-versions were made. These so-called electrical panel devices were realized as three- and six-phase array devices and a nine (3x3) electrode dot device [100,101]. The three- and six-phase array devices consist of a substrate with electrode arrays of a paste printed on using a silkscreen printmaking process. This substrate is covered with an insulating covering film. [Pg.54]

Mixer type Electrical phase-array panel device Multi pitch length 0.5 mm, 0.75 mm, 1.0 mm, 2.0 mm... [Pg.54]

Marrouche Np et al, Phased-array intracardiac echocardiography monitoring during pulmonary vein isolation in patients with atrial fibrillation impact on outcome and complications. Circulation 2003 107(21 ) 2710-271 6. [Pg.491]

To assess the purity and quality of the Ab intended for use on preactivated arrays, screen the Ab on NP20 arrays (normal phase arrays) also refer to the product data sheet for the presence of carrier proteins such as BSA and gelatin. [Pg.83]

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