Abstract:
An ultrasonic wave is applied to an anisotropic sample material in an initial direction and the intensity of the ultrasonic wave is measured on an opposite surface of the sample material by two adjacent receiving points located in an array of receiving points. A ratio is determined between the measured intensities of two adjacent receiving points, the ratio being indicative of an angle of flux deviation from the initial direction caused by an unknown applied load. This determined ratio is then compared to a plurality of ratios of a similarly tested, similar anisotropic reference material under a plurality of respective, known load conditions, whereby the load applied to the particular anisotropic sample material is determined. A related method is disclosed for determining the fiber orientation from known loads and a determined flux shift.
Abstract:
Method and apparatus for the non-destructive monitoring of the time dependent curing of an advanced composite positioned within an autoclave where it is subjected to varying pressures and elevated temperatures over a predetermined time period. A tool receiving the uncured advanced composite for receiving an acoustic wave guide which directly coupled to the composite. Ultrasound pulses are directed through the acoustic wave guide and the amplitude of the reflected pulses indicate changes in the modulus of the composite during the cure.
Abstract:
A non-destructive method for evaluating ropes, cables, and strands for flaws and tension is shown. The method permits detecting flaws by recognizing certain vibrational wave amplitude and distribution patterns resulting from striking a test subject with a transverse force. Tension on a test subject is calculated by measuring propagation velocity of the vibrational waves through the test subject. An apparatus is provided which produces vibrational waves in a test subject, measures the amplitude and time distribution of the waves, and displays the measurements for analysis.
Abstract:
Apparatus for automatically inspecting brittle articles such as containers of glass and the like has element (50) which applies a force to each article in turn, so as to propagate any cracks in the glass. Ultrasonic vibrations created during the propagation of a crack is transmitted via a constant laminar stream of liquid (76) from which the vibrations are received by a transducer head (94) of the crack detection equipment, which triggers an alarm, a visual display and/or an automatic marking or rejection device.
Abstract:
Embodiments of the present disclosure provide a multi-physical field imaging method based on PET-CT and DAS, comprising: wrapping distributed acoustic sensors on a surface of a non-metallic sample to be tested, and then placing them in a pressure device; loading triaxial pressures; preparing a tracer fluid; pumping the tracer fluid into the non-metallic sample; collecting PET images and CT images of internal structure of the non-metallic sample, meanwhile, monitoring internal acoustic emission events of the non-metallic sample in real time; combining the PET images with the CT images, to obtain PET/CT images; locating the acoustic emission events, and obtaining occurrence time and spatial location of internal structural perturbations; and analyzing a mechanism of fluid-solid coupling effect in the non-metallic sample under loaded stress. The imaging method and system of the present disclosure can accurately and reliably image the fluid-solid coupling process in the material.
Abstract:
Provided in some embodiments are systems and methods for preparing oriented samples of a laminated rock having different lamination orientations, for each of different stress-levels, transmitting an acoustic pulse through each oriented sample while tri-axially compressing the oriented sample at the stress-level to generate test data indicative of acoustic velocities through the laminated rock at different combinations of lamination orientations and stress levels, determining acoustic velocities through the laminated rock at the different combinations of lamination orientations and stress levels based on the test data, generating a rock model for the laminated rock based on the acoustic velocities, and determining a property of a second laminated rock (e.g., total organic carbon (TOC) content) based on the rock model for the laminated rock.
Abstract:
Methods and systems are provided for evaluating rock specimens subjected to high pressures and temperatures by ultrasonic evaluation utilizing various transducer enhancements. Certain embodiments contemplate configuring ultrasonic evaluation systems to provide more accurate measurements, enhanced protection of transducer elements, fewer metal interfaces between transducer elements and test specimens, and easier access to transducer elements for maintenance and replacement. Additionally, certain embodiments allow for sequential or simultaneous p-wave and s-wave measurements of a test specimen. These enhancements translate into a more accurate and efficient ultrasonic evaluation system offering higher resolution measurements.
Abstract:
An acoustic emissions testing device includes a pressurizable chamber, a rock sample, and one or ore acoustic sensors communicably coupled to the rock sample. The chamber includes a first chamber being pressurizable to a first pressure and a second chamber pressurizable to a second pressure. The rock sample is positioned within the pressurizable chamber such that a first portion of the sample is exposed to the first pressure and a second portion of the sample is exposed to the second pressure. The second pressure is increased to a threshold pressure, maintained at the threshold pressure for a time period, and then decreased. The acoustic sensors detect one or more acoustic events occurring within the rock sample. In certain embodiments, one or more of the intensity, the spatial location, and the propagating direction for one or more acoustic events are determinable. The system includes the testing device coupled to a recorder.
Abstract:
An apparatus comprises a tensioned sample tube that receives a fluid sample, the tensioned sample tube has a pre-determined tension applied thereto. A vibration source and a vibration detector are coupled to the tensioned sample tube. A method of estimating a property of a fluid comprises tensioning a sample tube to a predetermined tension. A sample of the fluid is received in the tensioned sample tube. The tensioned sample tube is vibrated. A resonant frequency of the tensioned sample tube is detected. The property of the fluid is estimated based on the detected resonant frequency of the tensioned sample tube.
Abstract:
There are provided a method and an apparatus for detecting damage to a high-pressure tank, with which a sign of failure of a high-pressure tank containing a high-pressure fluid can be detected early and non-destructively.An acoustic emission sensor (AE sensor) 1 is used for the non-destructive detection of a sign of failure that occurs upon filling a high-pressure tank 2 with a fluid. One AE signal detected by the AE sensor 1 is counted as one hit, the hit rate indicating the change in hits over time is found, and a sign of failure is detected from the change in the hit rate. When microcracks develop in the high-pressure tank 2, and a plurality of these microcracks join together and grow into a single, macroscopic crack, the hit rate of the AE signal no longer increases with respect to an increase in the internal pressure of the high-pressure tank 2, eventually reaching a saturation state. The hit rate in this saturation state is used to determine that there is a sign of failure.