摘要:
A micromachined ultrasonic transducer array comprising a multiplicity of cMUT cells built on a substrate. Each cMUT cell comprises a compliant support structure built on the substrate, a membrane supported over a cavity by the compliant support structure, a first electrode supported by the membrane, and a second electrode that forms a capacitor with the first electrode, the cavity being disposed between the first and second electrodes. The compliant support structure uncouples the non-membrane outer surface of each cMUT cell from the supporting substrate.
摘要:
A micromachined ultrasonic transducer array comprising a multiplicity of cMUT cells built on a substrate. Each cMUT cell comprises a compliant support structure built on the substrate, a membrane supported over a cavity by the compliant support structure, a first electrode supported by the membrane, and a second electrode that forms a capacitor with the first electrode, the cavity being disposed between the first and second electrodes. The compliant support structure uncouples the non-membrane outer surface of each cMUT cell from the supporting substrate.
摘要:
A tool break detection system has an automatic gain control to adjust the analog signal channel gain and hold the cutting vibration signal at a desired average level. The AGC time constant is long enough that the detection of abrupt tool breaks and sudden large signal level transistions by the digital signature recognition logic is unaffected. However, the gradual decrease in signal level produced by a crumbly-type break would be removed by AGC action. In a system with a hardware AGC, crossing a high gain threshold resets gain to a low value and the resulting abrupt and persisting change in signal level is detected by the abrupt tool break logic. Another embodiment uses the gain command output by a software AGC and generates a break detected signal directly, without resetting the gain command, as gain rises above a high gain alarm level which is recalculated at the start of each cut.
摘要:
A system and method to display a four-dimensional (4D) model of an imaged anatomy is provided. The system comprises a controller, and an imaging system including an imaging probe in communication with the controller. The imaging probe can acquire generally real-time, 3D image data relative to a direction of image acquisition along an imaging plane. The system also includes a tracking system in communication with the controller. The tracking system includes at least one tracking element integrated with the imaging probe. The system is operable to process the generally real-time, 3D image data acquired by the imaging probe relative to generally real-time tracking information acquired by the tracking system so as to display the 4D model of the imaged anatomy.
摘要:
Certain embodiments provide systems and methods for catheter positioning. Certain embodiments provide a catheter for use in at least intravenous and intracardiac spaces. The catheter includes a catheter body having a length and a tip portion at a distal end of the catheter body. The catheter also includes a plurality of wires for moving the catheter body in a plurality of directions. The catheter further includes a first control for manipulating the plurality of wires in two primary planes of movement for the catheter body. The catheter includes a second control for manipulating the plurality of wires in two secondary planes of movement for the catheter body. The second control is distinct in appearance and operation from the first control.
摘要:
An ultrasonic transducer device comprising: an ultrasonic transducer array micromachined on a substrate; flexible electrical connections connected to the transducer array; and a body of acoustically attenuative material that supports the substrate and the flexible electrical connections. The acoustic backing material may contain additional features, such as tabs or notches, for use in positioning the transducer on fixtures during manufacturing or positioning the transducer within a housing during final assembly. Tabs or other features that are used only during manufacturing may be subsequently removed from the device. The MUT device itself may also be thinned so as to provide flexibility as desired. The backing material is preferably matched in acoustic impedance to the silicon wafer so as to prevent reflection at the interface of any acoustic energy propagating rearward, i.e., in the direction away from the device front surface. The backing material may also possess a high thermal conductivity to assist in removal of heat from the device.
摘要:
This invention utilizes a system of interlinked modular hardware and modular software for continuously controlling the manufacture of a workpiece. By using a modular architecture, the system capabilities can be expanded or modified without requiring major redesign.
摘要:
A system and method of imaging an imaged subject is provided. The system comprises a controller, and an imaging system including an imaging probe in communication with the controller. The imaging probe includes a transducer array operable to move through a range of motion along a first imaging path at a first speed to acquire a first set of image data. The transducer array can be operable to move through the range of motion along the first imaging path at a second speed greater than the first speed so as to acquire an update image data at a rate faster than acquisition of the first set of image data.
摘要:
A system and method for monitoring machine tool operations provides a multi-level tool break alarm and uses information from multiple sensors of different types. Signal processing and pattern recognition logic techniques are applied to a cutting process high frequency vibration signal to detect major tool breaks requiring prompt stoppage of the cut. False alarm resistant detection of minor tool breaks, for which the response may not be an immediate stop of the cutting process, is obtained with information from a low frequency vibration sensor, an axis drive current sensor, or an axis velocity sensor. A minor tool break alarm is generated when signal transients in both a high frequency and low frequency channel signal are in close time coincidence, and a major alarm when the high frequency channel transient is followed by a persisting mean vibration level shift.
摘要:
Sharp tools have different cutting characteristics from dull or worn tools. Among these differences is that a wear land develops on the cutting tool so that more of the cutting tool comes into contact with the workpiece during the cutting process. The increased contact area between the tool and workpiece forces more energy to be consumed by the cutting machine in making a cut because more energy is expended in non-productive work. Indications of an increase in non-productive work are the increased power or force necessary to operate a spindle in lathes, milling machines, etc., and the increased energy in cutting vibrations in a low frequency range emitted during the cutting process. Another indication of decreased efficiency of the cutting process is the decreased energy in cutting vibrations in a high frequency range emitted during the cutting process. A method and apparatus are described for continuously monitoring a ratio of spindle force or power or low frequency vibration energy to high frequency vibration energy during the cutting process, and generating an output warning signal when the radio reaches a preselected level correlated with excessive tool wear.