摘要:
Guided ultrasonic waves are used for the detection of defective tubes in a heat exchanger or steam generator by using a transducer which generates a guided wave at predetermined parameters of phase velocity and frequency to operate at a point on a dispersion curve which minimizes leakage of ultrasonic energy to fluid surrounding the tube. Various techniques of generating ultrasonic waves of various phase velocities such as a comb type filter allow phase velocity points on a dispersion curve to be freely selected.
摘要:
A fitting for a fluid-circulating heat exchanging garment includes a cylindrical tube of flexible PVC extending from and integrally formed with a fluid-conducting chamber, the tube having a length, a distal portion with an inner diameter adapted to receive and closely fit a tubing end of a flexible PVC tubing, and a proximal portion with an inner diameter substantially equal to an inner diameter of the flexible PVC tubing, the cylindrical tube having a plurality of spaced apart radially-extending ribs extending the length of the tube and continuing to an outer surface of the fluid-conduction chamber. A manifold for heat exchanging garments has a central fluid-conducting chamber with a plurality of fittings extending therefrom and an inlet/outlet for connection to flexible tubing connected to a fluid circulating system.
摘要:
Methods and systems (10) based on guided wave thermography for non-destructively inspecting structural flaws that may be present in a structure (15). For example, such systems and methods may provide the ability to selectively deliver sonic or ultrasonic energy to provide focusing and/or beam steering throughout the structure from a fixed transducer location (12, 14, 16). Moreover, such systems and methods may provide the ability to selectively apply sonic or ultrasonic energy having excitation characteristics (FIGS. 11 and 12) which may be uniquely tailored to enhance the thermal response (FIGS. 5 and 7) of a particular flaw geometry and/or flaw location.
摘要:
A method for the nondestructive testing of pipeline, and internal or external coatings, using guided ultrasonic waves excited from the inside or outside diameter, wherein at least two transducers are employed to send and receive ultrasound, wherein a data normalization scheme is employed to account for transducer variability, and wherein the hardware arrangement has a number of pulser channels and a number of receiver channels for the collection and storage of signals.
摘要:
A contaminant detection system includes a transmitter for transmitting a guided wave through the skin at particular resonances, wherein each resonance point utilized will have propagation characteristics sensitive to a condition of interest. A contaminant may then be classified by transmitting several resonances and then carrying out appropriate feature extraction and pattern recognition techniques utilizing a host processor.
摘要:
Methods and systems (10) based on guided wave thermography for non-destructively inspecting structural flaws that may be present in a structure (15). For example, such systems and methods may provide the ability to selectively deliver sonic or ultrasonic energy to provide focusing and/or beam steering throughout the structure from a fixed transducer location (12, 14, 16). Moreover, such systems and methods may provide the ability to selectively apply sonic or ultrasonic energy having excitation characteristics (FIGS. 11 and 12) which may be uniquely tailored to enhance the thermal response (FIGS. 5 and 7) of a particular flaw geometry and/or flaw location.
摘要:
A system includes at least one strip of ferromagnetic material and a plurality of pulsing/receiving coil circuits. The at least one strip of ferromagnetic material is induced with a bias magnetic field and is coupled to a surface of a structure under test. The plurality of pulsing/receiving coil circuits are aligned with a surface of the at least one strip of the ferromagnetic material. The plurality of pulsing/receiving coil circuits are individually controllable by a number of channels to excite guided waves in the structure under test using at least one of active phased-array focusing or synthetic phased-array focusing of the guided waves.
摘要:
A method is provided for making a fluid-circulating heat exchanging garment, the method including providing a fabric panel for assembly of the heat exchanging garment, defining a tubing layout on the fabric panel with straight portions and bend portions defined in a flexible tubing. The straight portions of the tubing are affixed to the fabric panel and a mold is inserted into the inner radius of each bend portion. The mold has a shape corresponding to each bend portion and a channel having a radius adapted to closely fit over the tubing. The fabric panel and tubing are heated to an annealing temperature of the tubing. After cooling the fabric panel, the molds are removed, leaving the tubing reshaped at the bend portions to a desired radius.
摘要:
An acoustic lens having nonuniform cross sectional thickness is disposed in the path of an ultrasonic energy search beam traveling from a transducer probe to an object to be examined. In an alternative embodiment the lens has at least one contoured surface. As the lens undergoes motion in a plane substantially normal to the direction of the search beam, the search beam exhibits a varying focal zone depth and beam path for providing real time ultrasonic scanning of the examined object.
摘要:
A quick disconnect latching device for use in a liquid conduit coupling has two halves: a pin half and a release half. The pin half includes a casing sleeve into which a latch pin is slidably retained. The latch pin is spring biased into a retracted position within the sleeve. Latch pin dogs are located at the ends of arms extending from the latch pin to interact with a catch within the release half. A hollow nose casing is tapered to cam the arms inward when a sufficient separating axial force is applied to one or both of the pin half and the release half, so that the latch pin dogs release the catch. The amount of force required to separate the latch halves can be adjusted by varying the spring bias using an adjustment screw.