Principles for Echo Position Determination Using Airborne Ultrasound

2010 ◽  
Vol 437 ◽  
pp. 258-262
Author(s):  
Georg Kaniak ◽  
Herbert F. Schweinzer
Keyword(s):  
Time Of Flight ◽  
Experimental Results ◽  
Ultrasound Transducer ◽  
Reflection Point ◽  
Position Determination ◽  
Multiple Receivers ◽  
Directional Characteristics ◽  
Ultrasound Signal ◽  
Airborne Ultrasound

Different approaches for determining the position of the reflection point of a transmitted ultrasound signal are investigated assuming a specular environment. Two different principles are outlined: one based on the evaluation of time of flight (TOF) differences at multiple receivers, the second on the evaluation of the directional characteristics of the ultrasound transducer itself. Experimental results are discussed as well as advantages that are gained by combining both methods.

Ray Based Model for the Ultrasonic Time-of-Flight Diffraction Simulation of Thin Walled Structure Inspection

2005 ◽  
Vol 127 (3) ◽  
pp. 262-268 ◽  
Author(s):  
G. Baskaran ◽  
K. Balasubramaniam ◽  
C. V. Krishnamurthy ◽  
C. Lakshmana Rao
Keyword(s):  
Time Of Flight ◽  
Diffraction Theory ◽  
Pressure Vessels ◽  
Experimental Results ◽  
Signal Identification ◽  
Time Of Flight Diffraction ◽  
Aerospace Applications ◽  
Ultrasonic Time ◽  
Probe Frequency ◽  
Thin Walled

It is necessary to size the cracklike defects accurately in order to extend the life of thin-walled (<10mm) components (such as pressure vessels) particularly for aerospace applications. This paper discusses the successful application of ray techniques to simulate the ultrasonic time-of-flight diffraction experiments for platelike structures. For the simulation, the diffraction coefficients are computed using the geometric diffraction theory. The A and B scans are simulated in near real time and the different experimental parameters can be interactively controlled due to the computational efficiency of the ray technique. The simulated results are applied to (1) defect signal identification for vertical defects, (2) inspection of inclined defects, and (3) study the effect of pulse width or probe frequency on experimental results. The simulated results are compared with laboratory scale experimental results.

Novel Airborne Ultrasound Transducer

1995 ◽  
pp. 183-190 ◽  
Author(s):  
H. Dabirikhah ◽  
C. W. Turner
Keyword(s):  
Ultrasound Transducer ◽  
Airborne Ultrasound

Silicon Subiodide Clusters

2007 ◽  
Vol 7 (11) ◽  
pp. 3788-3791 ◽  
Author(s):  
Andriy Dmytruk ◽  
Yeon-Su Park ◽  
Atsuo Kasuya ◽  
Hideki Kikuchi ◽  
Masae Takahashi ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ab Initio ◽  
Mass Spectroscopy ◽  
Theoretical Calculations ◽  
Time Of Flight ◽  
Experimental Results ◽  
Silicon Cluster ◽  
Chain Ring ◽  
Bulk Powder

Silicon subiodide clusters (SinIm, n = 1–20) produced by laser ablation of bulk powder silicone tetraiodide have been investigated by time-of-flight mass spectroscopy and ab initio calculations. Both experimental results and theoretical calculations revealed a tendency to form different structures of the clusters depending on n: chain, ring, and cage structures for n ≤ 6, 6 < n < 16, and n ≥ 16, respectively. The results showed that iodine, like hydrogen, can be used for stable silicon cluster termination.

Silicon Subiodide Clusters

2007 ◽  
Vol 7 (11) ◽  
pp. 3788-3791
Author(s):  
Andriy Dmytruk ◽  
Yeon-Su Park ◽  
Atsuo Kasuya ◽  
Hideki Kikuchi ◽  
Masae Takahashi ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ab Initio ◽  
Mass Spectroscopy ◽  
Theoretical Calculations ◽  
Time Of Flight ◽  
Experimental Results ◽  
Silicon Cluster ◽  
Chain Ring ◽  
Bulk Powder

Silicon subiodide clusters (SinIm, n = 1–20) produced by laser ablation of bulk powder silicone tetraiodide have been investigated by time-of-flight mass spectroscopy and ab initio calculations. Both experimental results and theoretical calculations revealed a tendency to form different structures of the clusters depending on n: chain, ring, and cage structures for n ≤ 6, 6 < n < 16, and n ≥ 16, respectively. The results showed that iodine, like hydrogen, can be used for stable silicon cluster termination.

The time-of-flight mass identification system connected to the Alice He-JET. “on-line” experimental results

1978 ◽  
Vol 156 (3) ◽  
pp. 355-363 ◽  
Author(s):  
S. Della Negra ◽  
C. Deprun ◽  
H. Jungclas ◽  
H. Gauvin ◽  
J.P. Husson ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Experimental Results ◽  
Identification System ◽  
On Line ◽  
Mass Identification

scholarly journals A Low-Resources TDC for Multi-Channel Direct ToF Readout Based on a 28-nm FPGA

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 308
Author(s):  
Mojtaba Parsakordasiabi ◽  
Ion Vornicu ◽  
Ángel Rodríguez-Vázquez ◽  
Ricardo Carmona-Galán
Keyword(s):  
Field Programmable Gate Array ◽  
High Performance ◽  
Delay Line ◽  
Time Of Flight ◽  
Experimental Results ◽  
Digital Converter ◽  
Input Stage ◽  
Online Calibration ◽  
Field Programmable ◽  
Gate Array

In this paper, we present a proposed field programmable gate array (FPGA)-based time-to-digital converter (TDC) architecture to achieve high performance with low usage of resources. This TDC can be employed for multi-channel direct Time-of-Flight (ToF) applications. The proposed architecture consists of a synchronizing input stage, a tuned tapped delay line (TDL), a combinatory encoder of ones and zeros counters, and an online calibration stage. The experimental results of the TDC in an Artix-7 FPGA show a differential non-linearity (DNL) in the range of [−0.953, 1.185] LSB, and an integral non-linearity (INL) within [−2.750, 1.238] LSB. The measured LSB size and precision are 22.2 ps and 26.04 ps, respectively. Moreover, the proposed architecture requires low FPGA resources.

The First Experimental Results of Time-of-Flight Neutron Spectrometer at EAST

2021 ◽  
Vol 40 (1) ◽  
Author(s):  
Yimo Zhang ◽  
Lijian Ge ◽  
Zhimeng Hu ◽  
Jiaqi Sun ◽  
Xiangqing Li ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Experimental Results ◽  
Neutron Spectrometer
Sign in / Sign up

Export Citation Format

Share Document