An antenna group delay measurement method based on three‐antenna extrapolation and least residual error curve fitting technique

2018 ◽  
Vol 60 (7) ◽  
pp. 1608-1612
Author(s):  
Haoyu Lin ◽  
Zhenfei Song ◽  
Xuetian Wang ◽  
Hongmin Gao
Keyword(s):  
Curve Fitting ◽  
Measurement Method ◽  
Group Delay ◽  
Residual Error ◽  
Error Curve ◽  
Delay Measurement

scholarly journals An Improved Antenna Group Delay Measurement Method Using a Three-antenna Extrapolation Technique

2017 ◽  
Vol 26 (3) ◽  
pp. 675-681 ◽  
Author(s):  
Haoyu Lin ◽  
Zhenfei Song ◽  
Xuetian Wang ◽  
Hongmin Gao
Keyword(s):  
Measurement Method ◽  
Group Delay ◽  
Extrapolation Technique ◽  
Delay Measurement

An Efficient Group Delay Measurement Method for Frequency Converting System

2014 ◽  
Vol 33 (11) ◽  
pp. 3539-3553
Author(s):  
Kun Jiang ◽  
Yuanqin Wang ◽  
Pingbo Yan ◽  
Xiaomin Hou ◽  
Hong Ma ◽  
...  
Keyword(s):  
Measurement Method ◽  
Group Delay ◽  
Delay Measurement

Group delay measurement method based on narrow‐band spread spectrum signals

2014 ◽  
Vol 50 (5) ◽  
pp. 372-374 ◽  
Author(s):  
Zhi Bin Xiao ◽  
Yingxiang Liu ◽  
Xiaomei Tang ◽  
Xiang Wei Zhu ◽  
Feixue Wang
Keyword(s):  
Spread Spectrum ◽  
Measurement Method ◽  
Group Delay ◽  
Narrow Band ◽  
Delay Measurement ◽  
Spread Spectrum Signals

A Correlation-peak Fining Algorithm for Group Delay Measurement of Radio Frequency System

2014 ◽  
Vol 35 (12) ◽  
pp. 2921-2926
Author(s):  
Chen-xi Lu ◽  
Hong-yu Li ◽  
Feng Nian ◽  
Ke-ming Feng
Keyword(s):  
Radio Frequency ◽  
Group Delay ◽  
Correlation Peak ◽  
Delay Measurement

An Automated Group Delay Measurement

1972 ◽  
Vol 43 (11) ◽  
pp. 1568-1574 ◽  
Author(s):  
J. H. Matsinger
Keyword(s):  
Group Delay ◽  
Delay Measurement

New Interferometric Methods for Group-Delay Measurement Using White-Light Illumination

1996 ◽  
pp. 607-611
Author(s):  
A. P. Kovács ◽  
G. Kurdi ◽  
K. Osvay ◽  
R. Szipöcs ◽  
J. Hebling ◽  
...  
Keyword(s):  
White Light ◽  
Group Delay ◽  
Light Illumination ◽  
Delay Measurement ◽  
White Light Illumination

Ultrasonic Inspection of Carbon/ Phenolic Composites Using a Peak-Delay Measurement Method

2006 ◽  
Vol 321-323 ◽  
pp. 889-892
Author(s):  
In Young Yang ◽  
Kwang Hee Im ◽  
David K. Hsu ◽  
Sung Jin Song ◽  
Hyeon Cho ◽  
...  
Keyword(s):  
Ultrasonic Velocity ◽  
Measurement Method ◽  
Structural Integrity ◽  
Elevated Temperatures ◽  
Ultrasonic Inspection ◽  
Carbon Matrix ◽  
Transmission Method ◽  
Aerospace Applications ◽  
Delay Measurement ◽  
Overlap Method

Carbon/phenolic composite (CPC) materials are unique which consist of carbon fibers embedded in a carbon matrix. The CPCs are originally developed for aerospace applications and its low density, high thermal conductivity and excellent mechanical properties at elevated temperatures make it an ideal material for aircraft brake disks. The properties of the CPC are dependent on the manufacturing methods used for production and fiber arrangement. It is desirable to perform nondestructive evaluation to assess material properties and part homogeneity in order to ensure product quality and structural integrity of CPC brake disks. In this work, a CPC material was nondestructively characterized and a technique was developed to measure ultrasonic velocity in C/P composites using automated data acquisition software. Also a motorized system was adopted to measure ultrasonic velocity on the point of CPC materials under the same coupling conditions. Manual results were compared with those obtained by the motorized system with using drycoupling ultrasonics and through transmission method in immersion. A peak-delay measurement method well corresponded to ultrasonic velocities of the pulse overlap method and throughtransmission mode and C-scan image signal based on peak-to-peak amplitude.

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