scholarly journals A phase analysis of an ultrasonic pulse signal for measuring travel time

1994 ◽  
Vol 96 (5) ◽  
pp. 3346-3346
Author(s):  
Eunbang Lee ◽  
Shigeo Ohtsuki
Keyword(s):  
Travel Time ◽  
Phase Analysis ◽  
Pulse Signal ◽  
Ultrasonic Pulse

Experimental Analysis of Loss Mechanisms in a Gas Spring

2016 ◽  
Author(s):  
Paul Sapin ◽  
Drazen Fabris ◽  
Alexander J. White ◽  
Aly Taleb ◽  
Christos N. Markides
Keyword(s):  
Experimental Studies ◽  
Pulse Signal ◽  
Ultrasonic Pulse ◽  
Gas Temperature ◽  
Loss Mechanism ◽  
Non Invasive ◽  
Piston Cylinder ◽  
Exchange Processes ◽  
Storage Solutions ◽  
Bulk Parameters

Reciprocating-piston compressors and expanders are promising solutions to achieve higher overall efficiencies in various energy storage solutions. This article presents an experimental study of the exergetic losses in a gas spring. Considering a valveless piston-cylinder system allows us to focus on the thermodynamic losses due to thermal-energy exchange processes in reciprocating components. To differentiate this latter loss mechanism from mass leakages or frictional dissipation, three bulk parameters are measured. Pressure and volume are respectively measured with a pressure transducer and a rotary sensor. The gas temperature is estimated by measuring the Time-Of-Flight (TOF) of an ultrasonic pulse signal across the gas chamber. This technique has the advantage of being fast and non-invasive. The measurement of three bulk parameters allows us to calculate the work as well as the heat losses throughout a cycle. The thermodynamic loss is also measured for different rotational speeds. The results are in good agreement with previous experimental studies and can be employed to validate CFD or analytical studies currently under development.

Ultrasonic pulse signal resonance features in layered CFRP within voids

2017 ◽  
Vol 32 (3) ◽  
pp. 695-702
Author(s):  
Chenlong Yang ◽  
Yuechao Chen ◽  
Zhe Wang ◽  
Huifeng Zheng
Keyword(s):  
Pulse Signal ◽  
Ultrasonic Pulse

Ultrasonic Extension Sensing of Actuators Using Integrated Piezoelectric Transducer for Adaptive Optics

2008 ◽  
Vol 56 ◽  
pp. 70-75 ◽  
Author(s):  
Shin Sung Kim ◽  
A. Erman Uzgur ◽  
Mel Strachan ◽  
Jean François Saillant ◽  
Katherine Kirk
Keyword(s):  
Frequency Domain ◽  
Travel Time ◽  
Adaptive Optics ◽  
Ultrasonic Transducer ◽  
Ultrasonic Pulse ◽  
Ultrasonic Techniques ◽  
The Time Domain ◽  
Frequency Domain Approach ◽  
Pulse Echo ◽  
Multilayer Actuators

Ultrasonic techniques have been proposed to determine the extension of piezoelectric multilayer actuators which can be used to construct deformable mirrors for adaptive optics. In the time domain approach, pulse-echo measurements were carried out using an ultrasonic transducer integrated with the actuator. In the frequency domain approach, the frequency shift of the integrated transducer was used to estimate the extension by analysis of the resonant spectrum for impedance magnitude. Time and frequency domain measurements were carried out on large actuators (7×7×28 mm3). Frequency domain measurements were carried out on smaller actuators (2×2×2 mm3) which are more suitable for a miniaturised deformable mirror. Monolithic integration of the ultrasonic extension sensing transducer and the actuator was demonstrated using layers in the multilayer actuators. Strong correlation was observed between the travel time of the ultrasonic pulse through the actuator and the simultaneously-measured actuator extension. It was noted, contrary to common prediction, that the travel time of the signal was earlier when the actuator was extended. Results are presented on the development of the device design, the characteristics of the prototype device and the accuracy of the sensing techniques.

scholarly journals A Non-Destructive Imaging Method Based on Integral Signals of Ultrasonic Pulse

2021 ◽  
Vol 8 (1) ◽  
pp. 9-13
Author(s):  
Qiuhe Huang
Keyword(s):  
Phased Array ◽  
Matrix Decomposition ◽  
Pulse Signal ◽  
Laplacian Matrix ◽  
Ultrasonic Pulse ◽  
Inverse Laplace Transform ◽  
Imaging Method ◽  
Ultrasonic Phased Array ◽  
The Green Function ◽  
Array Imaging

For ultrasonic phased array imaging, the most popular technique is the delay superposition algorithm of time domain signals with fixed weights. However, this technique and similar approaches cannot effectively suppress the non-scanning azimuth noise, which drags the imaging resolution. To overcome the problem, this paper proposes a nondestructive imaging method based on ultrasonic pulse integral signal, on the basis of ultrasonic phased array imaging. This method relies on the Green function to implement inverse Laplace transform on the ultrasonic pulse signal, obtains the analytical expression of the operator through mathematical derivations and calculations, and adopts the eigenvalues obtained by Laplacian matrix decomposition for image edge detection. The experimental results show that the operator is simple and effective, and better in imaging than other methods.

X-ray phase analysis in leucite systems

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 531-536 ◽  
Author(s):  
J. Maixner ◽  
A. Kloužková ◽  
M. Mrázová ◽  
M. Kohoutková
Keyword(s):  
Phase Analysis ◽  
X Ray
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