 Fault isolation device |
| It is an object of this invention to provide a novel fault isolation device capable of isolating ... |
|
| Flow control system for the precipitation of silver halide emulsions |
| The apparatus includes a first valve assembly for introducing silver salt into the precipitation ... |
|
| Reproducing device for video signal |
| An object of the present invention is to provide a recording and reproducing for a video signal ... |
|
| DC restoration of sampled imagery signals |
| In accordance with the present invention, this problem is solved by controllably clocking the A-D ... |
|
| Software-based resolver-to-digital converter |
| In accordance with the teachings of the present invention, a software-based resolver-to-digital ... |
|
| Pyramid processor integrated circuit |
| The invention is described below with reference to an exemplary pyramid IC and to FIGS. 1-11. W... |
|
| Method for generating non-visible window edges in image compositing systems |
| The invention is a method used with a system for compositing a foreground scene including a subject ... |
|
| Modulator circuit for use with a plurality of operating standards |
| OF THE PREFERRED EMBODIMENT Referring firstly to FIG. 1, a modulator 2 in accordance with a ... |
|
|
Apparatus for producing time-staggered shock waves
| Details |
Inventors: Reichenberger, Helmut;
Assignee: Siemens Aktiengesellschaft (Berlin and Munich, DE)
Primary Examiner: Thaler; Michael H.
Assistant Examiner:
Attorney, Agent or Firm: Jay; Mark H.
A shock wave tube generates a plane shock wave which is divided into two partial waves by means of a splitting device, such as a cone. Adjacent the cone are first and second reflectors. The reflectors have different parabolic curvatures and different distances from the cone. Their respective foci coincide at a common point, where a concrement is located. The partial waves require different transit times to reach the common focus point. Time-staggered shock waves are obtained in the concrement with the use of a single shock wave tube. |
|
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS In the FIGURE, 1 generally indicates a shock wave tube of known type.
At the exit window 3 of the tube 1, a shock wave 5 issues after activation.
As a result of the design of the shock wave tube 1, the shock wave 5 is here a plane wave, which impinges on a dividing device 7.
The dividing device 7 consists of a material which relects ultrasonic waves.
It is a cone, preferably a 90.
degree.
cone, preferably made of brass.
The apex of the dividing device 7 points toward the shock wave tube 1.
Other cone-shaped dividing devices 7 may be used.
The shock wave tube axis 9 coincides with the axis of rotation 9a of the cone.
The dividing device 7 reflects the shock wave 5 at right angles, so that it diverges perpendicular to the shock wave tube axis 9, i.
e.
radially.
The part 5a of the shock wave 5 reflected to the right in the FIGURE impinges on a first curved reflector 11.
The part 5b of the shock wave 5 reflected to the left impinges on a second, differently curved reflector 13.
The first reflector 11 and the second reflector 13 are positioned so that they are at unequal distances (Ma>Mb) from the cone 7 and at the same time have their respective foci at a common point F.
At this point F is located a concrement 15 to be fragmented.
Point F is thus the focus region of the illustrated apparatus.
Instead of two semicircular reflectors 11, 13, four sector-shaped reflectors may be arranged, whose curvature or parabolic parameters are different or, in the case of opposite sectors, may be equal.
It can be seen from the FIGURE that the first and second reflectors 11, 13 are part of a ring which is formed by rotation of the arc of a first and second parabola, whose summits lie at Sa and Sb, respectively, and whose focus lies at F, about the axis of the cone 7, and that the two reflectors 11, 13 are located on opposite sides of the axis 9a of cone 7.
Due to the greater distance Ma of the first reflector 11 from cone 7 as compared to the distance Mb of the second reflector 13 from cone 7, the right-hand parts 5a travels further to reach the common point F than does the left-hand part 5b
|
|
Image Analysis 
